Name: troubleshooting focus image acquisition: patient positioning, transducer manipulation, and image optimization
Uploaded: 2023-03-03T14:25:00
Description: Watch this Scientific Journal Video about Troubleshooting FoCUS Image Acquisition: Patient Positioning, Transducer Manipulation, and Image Optimization at JoVE.com

We would like to thank the University of Michigan Department of Anesthesia, Max Harry Weil Institute for Critical Care Research and Innovation, and Katelyn Murphy for their administrative and graphic design support.

This material is the authors&#39; original work, which has not been previously published elsewhere. The protocol described is for clinical use and not research purposes. De-identified images were obtained from a volunteer model in a non-clinical environment. The authors did not seek a formal &#34;Not Regulated&#34; determination from the IRB in accordance with institutional policy, as the activity falls outside of the Common Rule and FDA definitions of human subject research.
1. The tran...

<ol>
	<li>Birch, M. S., Marin, J. R., Liu, R. B., Hall, J., Hall, M. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Trends+in+diagnostic+point-of-care+ultrasonography+reimbursement+for+medicare+beneficiaries+among+the+US+emergency+medicine+workforce,+2012+to+2016.">Trends in diagnostic point-of-care ultrasonography reimbursement for medicare beneficiaries among the US emergency medicine workforce, 2012 to 2016.</a> Annals of Emergency Medicine. 76 (5), 609-614 (2020).</li><li>Moore, C. L., Copel, J. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Point-of-care+ultrasonography.">Point-of-care ultrasonography.</a> The New England Journal of Medicine. 364 (8), 749-757 (2011).</li><li>Su, E., Dalesio, N., Pustavoitau, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Point-of-care+ultrasound+in+pediatric+anesthesiology+and+critical+care+medicine.">Point-of-care ultrasound in pediatric anesthesiology and critical care medicine.</a> Canadian Journal of Anaesthesiology. 65 (4), 485-498 (2008).</li><li>Niblock, F., Byun, H., Jabbarpour, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Point-of-care+ultrasound+use+by+primary+care+physicians.">Point-of-care ultrasound use by primary care physicians.</a> The Journal of the American Board of Family Medicine. 34 (4), 859-860 (2021).</li><li>Coritsidis, G. N., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Point-of-care+ultrasound+for+assessing+arteriovenous+fistula+maturity+in+outpatient+hemodialysis.">Point-of-care ultrasound for assessing arteriovenous fistula maturity in outpatient hemodialysis.</a> The Journal of Vascular Access. 21 (6), 923-930 (2020).</li><li>Gundersen, G. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Adding+point+of+care+ultrasound+to+assess+volume+status+in+heart+failure+patients+in+a+nurse-led+outpatient+clinic.+A+randomised+study.">Adding point of care ultrasound to assess volume status in heart failure patients in a nurse-led outpatient clinic. A randomised study.</a> Heart. 102 (1), 29-34 (2016).</li><li>Kirkpatrick, J. N., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Recommendations+for+echocardiography+laboratories+participating+in+cardiac+point+of+care+cardiac+ultrasound+(POCUS)+and+critical+care+echocardiography+training:+report+from+the+American+Society+of+Echocardiography.">Recommendations for echocardiography laboratories participating in cardiac point of care cardiac ultrasound (POCUS) and critical care echocardiography training: report from the American Society of Echocardiography.</a> Journal of the American Society of Echocardiography. 33 (4), 409-422 (2020).</li><li>Annals of Emergency Medicine. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ultrasound+Guidelines:+Emergency,+point-of-care+and+clinical+ultrasound+guidelines+in+medicine.">Ultrasound Guidelines: Emergency, point-of-care and clinical ultrasound guidelines in medicine.</a> Annals of Emergency Medicine. 69 (5), 27-54 (2017).</li><li>Levitov, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Guidelines+for+the+appropriate+use+of+bedside+general+and+cardiac+ultrasonography+in+the+evaluation+of+critically+ill+patients-part+II:+cardiac+ultrasonography.">Guidelines for the appropriate use of bedside general and cardiac ultrasonography in the evaluation of critically ill patients-part II: cardiac ultrasonography.</a> Critical Care Medicine. 44 (6), 1206-1227 (2016).</li><li>Neskovic, A. N., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Focus+cardiac+ultrasound+core+curriculum+and+core+syllabus+of+the+European+Association+of+Cardiovascular+Imaging.">Focus cardiac ultrasound core curriculum and core syllabus of the European Association of Cardiovascular Imaging.</a> European Heart Journal. Cardiovascular Imaging. 19 (5), 475-481 (2018).</li><li>Mitchell, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Guidelines+for+Performing+a+Comprehensive+Transthoracic+Echocardiographic+Examination+in+Adults:+Recommendations+from+the+American+Society+of+Echocardiography.">Guidelines for Performing a Comprehensive Transthoracic Echocardiographic Examination in Adults: Recommendations from the American Society of Echocardiography.</a> Journal of the American Society of Echocardiography. 32 (1), 1-64 (2019).</li><li>Dinh, V. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Measuring+cardiac+index+with+a+focused+cardiac+ultrasound+examination+in+the+ED.">Measuring cardiac index with a focused cardiac ultrasound examination in the ED.</a> The American Journal of Emergency Medicine. 30 (9), 1845-1851 (2012).</li><li>Expert Round Table on Echocardiography in ICU. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=International+consensus+statement+on+training+standards+for+advanced+critical+care+echocardiography.">International consensus statement on training standards for advanced critical care echocardiography.</a> Intensive Care Medicine. 40 (5), 654-666 (2014).</li><li>Expert Round Table on Echocardiography in ICU. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=International+expert+statement+on+training+standards+for+critical+care+ultrasonography.">International expert statement on training standards for critical care ultrasonography.</a> Intensive Care Medicine. 37 (7), 1077-1083 (2011).</li><li>Spencer, K. T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Focused+cardiac+ultrasound:+recommendations+from+the+American+Society+of+Echocardiography.">Focused cardiac ultrasound: recommendations from the American Society of Echocardiography.</a> Journal of the American Society of Echocardiography. 26 (6), 567-581 (2013).</li><li>Nelson, B. P., Sanghvi, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Point-of-care+cardiac+ultrasound:+feasibility+of+performance+by+noncardiologists.">Point-of-care cardiac ultrasound: feasibility of performance by noncardiologists.</a> Global Heart. 8 (4), 293-297 (2013).</li></ol>

The aim of this publication is to provide practical recommendations and best practices to achieve optimal FoCUS images in challenging clinical environments. Formal ultrasound seminars, clinical experience, and observations of learners during hands-on teaching have given insight into pitfalls and less optimal tendencies. As a result, many factors that influence the stereotactic and psychomotor skills have become apparent. Although this material is described in relation to FoCUS exams, many of the principles can be applied...

Focused cardiac ultrasound (FoCUS) is a limited, clinician-performed application of echocardiography that provides immediate anatomic, physiologic, and functional information to patient care. These exams, consisting of five classic views, are problem oriented, performed in real time at the bedside, and do not replace comprehensive echocardiography exams1,2. Given the focused nature of these exams, they are often repeatedly performed when clinical status changes or serial monitoring is required. It is important to have standardized training and obtain adequate images of all five views, when possible, as some views may provide limited information depending on the individual patient and pathology.
The use of FoCUS is rapidly expanding. Many clinical landscapes, such as perioperative anesthesiology, critical care and emergency medicine1,2,3, now routinely employ FoCUS. Inpatient medical wards and outpatient clinical care settings are also adopting this tool to enhance clinical practice4,5,6. As a result, several societal bodies, such as the American Society of Echocardiography, the Society of Critical Care Medicine, and the American College of Emergency Physicians, have published guidelines and recommendations for FoCUS competency and scope of practice7,8,9. While these guidelines and recommendations are not codified, much of the content is consistent and influences FoCUS training curricula10.
Beyond didactics and image interpretation, competency in FoCUS includes mastery of stereotactic and psychomotor skill sets. Stereotactic skill refers to the accurate positioning of ultrasound transducers on the body, based on three-dimensional anatomic features. Psychomotor skill describes the relationship between cognitive function and physical movement that influences coordination, dexterity, and manipulation. Expanding knowledge and awareness about these skills supports FoCUS trainee development.
This article presents concepts for high-quality image acquisition in FoCUS, with both pragmatic considerations and attention to stereotactic and psychomotor skill sets. Specifically, it discusses optimal patient positioning, transducer manipulation, and suggests tips to optimize phased array transducer use. Finally, it examines image optimization for 2-dimensional (B-mode or 2-D mode) and motion modes (M-mode).

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			<td>Aquasonic ultrasound gel</td>
			<td>Parker</td>
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			<td>https://dr.graphiccontrols.com/en/catalog/ultrasound-gel/parker-laboratories-01-50-aquasonic-100-gel-5l-1332e66e/</td>
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			<td>Philips Sparq ultrasound machine</td>
			<td>Phillips</td>
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			<td>https://www.usa.philips.com/healthcare/product/HC795090CC/sparq-ultrasound-system#documents</td>
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</table>

troubleshooting focus image acquisition: patient positioning, transducer manipulation, and image optimization

Focused cardiac ultrasound (FoCUS) is a limited, clinician-performed application of echocardiography to add real-time information to patient care. These bedside exams are problem oriented, rapidly and repeatedly performed, and largely qualitative in nature. Competency in FoCUS includes mastery of the stereotactic and psychomotor skills required for transducer manipulation and image acquisition. Competency also requires the ability to optimize the setup, troubleshoot image acquisition, and understand the sonographic limitations because of complex clinical environments and patient pathology. This article presents concepts for successful, high-quality two-dimensional (B-mode) image acquisition in FoCUS.
Concepts of high-quality image acquisition can be applied to all established sonographic windows of the FoCUS exam: the parasternal long-axis (PLAX), parasternal short-axis (PSAX), apical four chamber (A4C), subcostal fourchamber (SC4C), and the inferior vena cava (IVC). The apical five-chamber (A5C) and subcostal short-axis (SCSA) views are mentioned, but are not discussed in-depth. A pragmatic figure illustrating the movements of the phased array transducer is also provided to serve as a cognitive aid during FoCUS image acquisition.

Representative images obtained from the focused cardiac ultrasound protocol presented above are presented in Figure 2, Figure 3, Figure 4, Figure 5, and Figure 6, demonstrating the feasibility of the technique described. These images were captured with the phased array 5-1 MHz transducer. The parasternal long axis (PLAX) image obtained from protocol se...

Watch this Scientific Journal Video about Troubleshooting FoCUS Image Acquisition: Patient Positioning, Transducer Manipulation, and Image Optimization at JoVE.com

Troubleshooting FoCUS Image Acquisition: Patient Positioning, Transducer Manipulation, and Image Optimization

Here, we present a protocol to allow providers to perform focused cardiac ultrasound (FoCUS) in the clinical environment. We describe methods of transducer manipulation, review common pitfalls of transducer movements, and suggest tips to optimize phased array transducer use.

Focused cardiac ultrasound (FoCUS) is a limited, clinician-performed application of echocardiography to add real-time information to patient care. These ...

Focused cardiac ultrasound allows clinicians to perform problem-oriented ultrasound exams at the bedside to answer real-time clinical questions. The process is rapid, pragmatic, and repeatable in the clinical setting. The implications of this exam are applicable across the spectrum of critical illness because it provides information to aid in the clinical assessment of cardiac function, fluid status, and other hemodynamic features.Demonstrating this procedure will be doctors Adam Gottula and Suhas Devangam, fellow physicians, and Dr.Jessica Koehler, faculty physician at my institution. Begin by placing the patient in the supine position. If there is difficulty obtaining the parasternal long axis image, place the patient on their left side and extend their arm above their head.Place the transducer at an oblique angle between the third and fifth intercostal space of the parasternal region, with the transducer marker pointing to the patient's right shoulder. Visualize the right ventricle, left ventricle, left atrium, mitral valve, left ventricular outflow tract, aortic valve, and descending thoracic aorta. Then visualize the simultaneous opening and closing of the mitral and aortic valves to ensure the image is not foreshortened.Now start with an initial depth of approximately 15 to 20 centimeters, and adjust the depth so that the tip of the mitral valve is in the center of the image and the descending thoracic aorta is visible. Adjust the gain to maximize the visibility of the myocardium and mitral valve, and move the focus of the region of interest most focused at a depth of the mitral valve. To obtain this image, place the patient as previously demonstrated or in the supine position.Place the transducer approximately 90 degrees relative to the transducer in the parasternal long axis. Then tilt the transducer until the mid papillary muscles are visualized for the focus assessment. Tilt the transducer toward the base of the heart.Start with a deeper image to identify any pleural effusion. Adjust the depth to include the full depth of the left ventricle and diffuse centimeters beyond to ensure that a pericardial effusion would be fully visualized. Adjust the gain to maximize visualization of the septum and papillary muscles.Afterward, adjust the focus to the papillary muscles. Position the patient on their left side with their left arm extended above their head. If a significant artifact is present, have the patient exhale and hold their breath to minimize pulmonary artifact.Position the transducer in the fourth through sixth intercostal space along the left anterior auxiliary line, with the transducer marker pointed to the left axilla. Move the transducer lateral, medial or coddle to obtain an optimal apical four chamber view. If necessary, lift the breast tissue to allow probe access.If the left ventricular apex is not fully visualized, move the transducer lateral while orienting the transducer toward the right shoulder. In the normal heart, the apex of the left ventricle is at the top and center of the sector, the right ventricle is triangular and smaller, and the myocardium should be uniform from the apex to the atrio ventricular valves. Now capture an apical four chamber view that includes both atria ventricles, the inter ventricular septum, and the lateral portions of the tricuspid and mitral annuli.The aortic valve and left ventricular outflow tract should only be present in an apical five chamber view. To improve the image of the valves, slide the transducer up or down a rib space, and tilt the base of the transducer down. If the base of the transducer is tilted too far down, an apical five chamber view, including the aortic valve, will appear, and the transducer should be tilted back up to optimize the apical four chamber view.Rotate the base of the transducer toward the patient's midline to optimize the inter ventricular septum position, which should be present vertically in the center of the image. Image both the atria and increase the depth to include both atria at the image's deepest point and accommodate the left and right ventricular free walls. Adjust the gain to maximize visibility, often resulting in increased echogenicity of the myocardium, the mitral valvular annulus, and the tricuspid valvular annulus.Adjust the focus to the depth of the valvular annuli. The focused cardiac ultrasound parasternal long axis, parasternal short axis, apical four chamber, subcostal four chamber, and inferior vena cava images are being shown. The stereotactic and psychomotor aspects of the focused cardiac ultrasound require repetition, time, and experience to achieve mastery.The experience should include the performance of exams on patients with varying body habitus in a diversity of clinical settings. There are some clinical scenarios in which limitations cannot be overcome. A skilled provider will recognize situations in which focused cardiac ultrasound should not be performed and pursue alternative investigations such as transesophageal or comprehensive transthoracic echocardiography.

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Visualization of Vascular and Parenchymal Regeneration after 70% Partial Hepatectomy in Normal Mice

A modified silicone injection procedure was used for visualization of the hepatic vascular tree. This procedure consisted of in-vivo injection of the silicone compound, via a 26 G catheter, into the portal or hepatic vein. After silicone injection, organs were explanted and prepared for ex-vivo micro-CT (&#181;CT) scanning. The silicone injection procedure is technically challenging. Achieving a successful outcome requires extensive microsurgical experience from the surgeon. One of the challenges of this procedure involves determining the adequate perfusion rate for the silicone compound. The perfusion rate for the silicone compound needs to be defined based on the hemodynamic of the vascular system of interest. Inappropriate perfusion rate can lead to an incomplete perfusion, artificial dilation and rupturing of vascular trees.
The 3D reconstruction of the vascular system was based on CT scans and was achieved using preclinical software such as HepaVision. The quality of the reconstructed vascular tree was directly related to the quality of silicone perfusion. Subsequently computed vascular parameters indicative of vascular growth, such as total vascular volume, were calculated based on the vascular reconstructions. Contrasting the vascular tree with silicone allowed for subsequent histological work-up of the specimen after &#181;CT scanning. The specimen can be subjected to serial sectioning, histological analysis and whole slide scanning, and thereafter to 3D reconstruction of the vascular trees based on histological images. This is the prerequisite for the detection of molecular events and their distribution with respect to the vascular tree. This modified silicone injection procedure can also be used to visualize and reconstruct the vascular systems of other organs. This technique has the potential to be extensively applied to studies concerning vascular anatomy and growth in various animal and disease models.

Tools used for visualizing vascular regeneration require methods for contrasting the vascular trees. This film demonstrated a delicate injection technique used to achieve optimal contrasting of the vascular trees and illustrate the potential benefits resulting from a detailed analysis of the resulting specimen using &#181;CT and histological serial sections.

A modified silicone injection procedure was used for visualization of the hepatic vascular tree. This procedure consisted of in-vivo injection of the ...

A Whole Body Dosimetry Protocol for Peptide-Receptor Radionuclide Therapy (PRRT): 2D Planar Image and Hybrid 2D+3D SPECT/CT Image Methods

Peptide-receptor-radionuclide-therapy (PPRT) is a targeted therapy that combines a short-range energy radionuclide with a substrate with high specificity for cancer cell receptors. After injection, the radiotracer is distributed throughout the entire body, with a higher uptake in tissues where targeted receptors are overexpressed. The use of beta/gamma radionuclide emitters enables therapy imaging (beta-emission) and post-therapy imaging (gamma-emission) to be performed at the same time. Post-treatment sequential images permit absorbed dose calculation based on local uptake and wash-in/wash-out kinetics. We implemented a hybrid method that combines information derived from both 2D and 3D images. Serial whole-body images and blood samples are acquired to estimate the absorbed dose to different organs at risk and to lesions disseminated throughout the body. A single 3D-SPECT/CT image, limited to the abdominal region, overcomes projection overlap on planar images of different structures such as the intestines and kidneys. The hybrid 2D+3D-SPECT/CT method combines the effective half-life information derived from 2D planar images with the local uptake distribution derived from 3D images. We implemented this methodology to estimate the absorbed dose for patients undergoing PRRT with 177Lu-PSMA-617. The methodology could, however, be implemented with other beta-gamma radiotracers. To date, 10 patients have been enrolled into the dosimetry study with 177Lu-PSMA-617 combined with drug protectors for kidneys and salivary glands (mannitol and glutamate tablets, respectively). The median ratio between kidney uptake at 24 h evaluated on planar images and 3D-SPECT/CT is 0.45 (range:0.32-1.23). The comparison between hybrid and full 3D approach has been tested on one patient, resulting in a 1.6% underestimation with respect to full 3D (2D: 0.829 mGy/MBq, hybrid: 0.315 mGy/MBq, 3D: 0.320 mGy/MBq). Treatment safety has been confirmed, with a mean absorbed dose of 0.73 mGy/MBq (range:0.26-1.07) for kidneys, 0.56 mGy/MBq (0.33-2.63) for the parotid glands and 0.63 mGy/MBq (0.23-1.20) for submandibular glands, values in accordance with previously published data.

A Whole Body Dosimetry Protocol for Peptide-Receptor Radionuclide Therapy PRRT: 2D Planar Image and Hybrid 2D+3D SPECT/CT Image Methods

This method estimates the absorbed dose of different structures for peptide-receptor-radionuclide-therapy (PRRT) with the possibility of avoiding organ overlap on 2D-projections. Serial whole-body planar images permit estimation of mean absorbed doses along the whole body, while the hybrid approach, combining planar images and 3D-SPECT/CT image, overcomes the limitations of structure overlapping.

Peptide-receptor-radionuclide-therapy (PPRT) is a targeted therapy that combines a short-range energy radionuclide with a substrate with high specificity ...

Image Acquisition using Portable Sonography for Emergency Airway Management

With its increasing popularity and accessibility, portable ultrasonography has been rapidly adapted not only to improve the perioperative care of patients, but also to address the potential benefits of employing ultrasound in airway management. The benefits of point of care ultrasound (POCUS) include its portability, the speed at which it can be utilized, and its lack of invasiveness or exposure of the patient to radiation of other imaging modalities.
Two primary indications for airway POCUS include confirmation of endotracheal intubation and identification of the cricothyroid membrane in the event a surgical airway is required. In this article, the technique of using ultrasound to confirm endotracheal intubation and the relevant anatomy is described, along with the associated ultrasonographic images. In addition, identification of the anatomy of the cricothyroid membrane and the ultrasonographic acquisition of appropriate images to perform this procedure are reviewed.
Future advances include utilizing airway POCUS to identify patient characteristics that might indicate difficult airway management. Traditional bedside clinical exams have, at best, fair predictive values. The addition of ultrasonographic airway assessment has the potential to improve this predictive accuracy. This article describes the use of POCUS for airway management, and initial evidence suggests that this has improved the diagnostic accuracy of predicting a difficult airway. Given that one of the limitations of airway POCUS is that it requires a skilled sonographer, and image analysis can be operator dependent, this paper will provide recommendations to standardize the technical aspects of airway ultrasonography and promote further research utilizing sonography in airway management. The goal of this protocol is to educate researchers and medical health professionals and to advance the research in the field of airway POCUS.

Point of care ultrasound (POCUS) is increasingly being utilized in airway management. Presented here are some clinical utilities of POCUS, including differentiating endotracheal and esophageal intubation, identification of the cricothyroid membrane in the event a surgical airway is required, and measuring anterior neck soft tissue to predict difficult airway management.

With its increasing popularity and accessibility, portable ultrasonography has been rapidly adapted not only to improve the perioperative care of ...

Image Acquisition Method for the Sonographic Assessment of the Inferior Vena Cava

Over the past several decades, clinicians have incorporated several applications of diagnostic point-of-care ultrasound (POCUS) into medical decision-making. Among the applications of POCUS, imaging the inferior vena cava (IVC) is practiced by a wide variety of specialties, such as nephrology, emergency medicine, internal medicine, critical care, anesthesiology, pulmonology, and cardiology. Although each specialty uses IVC data in slightly different ways, most medical specialties, at minimum, attempt to use IVC data to make predictions about intravascular volume status. While the relationship between IVC sonographic data and intravascular volume status is complex and highly context-dependent, all clinicians should collect the sonographic data in standardized ways to ensure repeatability. This paper describes standardized IVC image acquisition including patient positioning, transducer selection, probe placement, image optimization, and the pitfalls and limitations of IVC sonographic imaging.&#160;This paper also describes the commonly performed anterior IVC long-axis view and three other views of the IVC that can each provide helpful diagnostic information when the anterior long-axis view is difficult to obtain or interpret.

Point-of-care ultrasound evaluation of the inferior vena cava (IVC) is commonly utilized to identify, among other things, the volume status. Imaging should be performed systematically to ensure repeatability. This manuscript reviews the methods and pitfalls of sonographic IVC examination.

Over the past several decades, clinicians have incorporated several applications of diagnostic point-of-care ultrasound (POCUS) into medical ...

Point-of-Care Lung Ultrasound in Adults: Image Acquisition

Consultative ultrasound performed by radiologists has traditionally not been used for imaging the lungs, as the lungs&#39; air-filled nature normally prevents direct visualization of the lung parenchyma. When showing the lung parenchyma, ultrasound typically generates a number of non-anatomic artifacts. However, over the past several decades, these artifacts have been studied by diagnostic point-of-care ultrasound (POCUS) practitioners, who have identified findings that have value in narrowing the differential diagnoses of cardiopulmonary dysfunction. For instance, in patients presenting with dyspnea, lung POCUS is superior to chest radiography (CXR) for the diagnosis of pneumothorax, pulmonary edema, lung consolidations, and pleural effusions. Despite its known diagnostic value, the utilization of lung POCUS in clinical medicine remains variable, in part because training in this modality across hospitals remains inconsistent. To address this educational gap, this narrative review describes lung POCUS image acquisition in adults, including patient positioning, transducer selection, probe placement, acquisition sequence, and image optimization.

Point-of-care ultrasound (POCUS) of the lungs provides quick answers in rapidly changing clinical scenarios. We present an efficient and informative protocol for image acquisition for use in acute care settings.

Consultative ultrasound performed by radiologists has traditionally not been used for imaging the lungs, as the lungs&#39; air-filled nature normally ...

A Modified Sonographic Algorithm for Image Acquisition in Life-Threatening Emergencies in the Critically Ill Newborn

The use of routine point-of-care ultrasound (POCUS) is increasing in neonatal intensive care units (NICUs), with several centers advocating for 24 h equipment availability. In 2018, the sonographic algorithm for life-threatening emergencies (SAFE) protocol was published, which allows the assessment of neonates with sudden decompensation to identify abnormal contractility, tamponade, pneumothorax, and pleural effusion. In the study unit (with a consulting neonatal hemodynamics and POCUS service), the algorithm was adapted by including consolidated core steps to support at-risk newborns, aiding clinicians in managing cardiac arrest, and adding views to verify correct intubation. This paper presents a protocol that can be applied in the NICU and the delivery room (DR) in relation to three scenarios: cardiac arrest, hemodynamic deterioration, or respiratory decompensation. 
This protocol can be performed with a state-of-the-art ultrasound machine or an affordable handheld device; the image acquisition protocol is carefully detailed. This method was designed to be learned as a general competence to obtain the timely diagnosis of life-threatening scenarios; the method aims to save time but does not represent a substitute for comprehensive and standardized hemodynamic and radiological analyses by a multidisciplinary team, which might not universally be on call but needs to be involved in the process. From January 2019 to July 2022, in our center, 1,045 hemodynamic consultation/POCUS consults were performed with 25 patients requiring the modified SAFE protocol (2.3%), and a total of 19 procedures were performed. In five cases, trained fellows on call resolved life-threatening situations. Clinical examples are provided that show the importance of including this technique in the care of critical newborns.

Here, we present a protocol that can be applied in the neonatal intensive care unit and the delivery room in relation to three scenarios: cardiac arrest, hemodynamic deterioration, or respiratory decompensation. This protocol can be performed with a state-of-the-art ultrasound machine or an affordable handheld device; an image acquisition protocol is carefully detailed.

The use of routine point-of-care ultrasound (POCUS) is increasing in neonatal intensive care units (NICUs), with several centers advocating for 24 h ...

Exploring Quantitative Autofluorescence in Age-Related Macular Degeneration

A Workflow to Quantitatively Determine Age-Related Macular Degeneration Lesion-Specific Variations in Fundus Autofluorescence

Fundus autofluorescence (FAF) imaging allows the noninvasive mapping of intrinsic fluorophores of the ocular fundus, particularly the retinal pigment epithelium (RPE), now quantifiable with the advent of confocal scanning laser ophthalmoscopy-based quantitative autofluorescence (QAF). QAF has been shown to be generally decreased at the posterior pole in age-related macular degeneration (AMD). The relationship between QAF and various AMD lesions (drusen, subretinal drusenoid deposits) is still unclear.
This paper describes a workflow to determine lesion-specific QAF in AMD. A multimodal in vivo imaging approach is used, including but not limited to spectral domain optical coherence tomography (SD-OCT) macular volume scanning and QAF. Using customized FIJI plug-ins, the corresponding QAF image is aligned with the near-infrared image from the SD-OCT scan (characteristic landmarks; i.e., vessel bifurcations). The foveola and the edge of the optic nerve head are marked in the OCT images (and transferred to the registered QAF image) for accurate positioning of the analysis grids.
AMD-specific lesions can then be marked on individual OCT BScans or the QAF image itself. Normative QAF maps are created to account for the varying mean and standard deviation of QAF values throughout the fundus (QAF images from a representative AMD group were averaged to build normative standard retinal QAF AMD maps). The plug-ins record the X and Y coordinates, z-score (a numerical measurement that describes the QAF value in relation to the mean of AF maps in terms of standard deviation from the mean), mean intensity value, standard deviation, and number of pixels marked. The tools also determine z-scores from the border zone of marked lesions.&#160;This workflow and the analysis tools will improve the understanding of the pathophysiology and clinical AF image interpretation in AMD.

Author Spotlight: Understanding Age-Related Macular Degeneration Pathophysiology with QAF Workflow 

This research describes a workflow to determine and compare autofluorescence levels from individual regions of interest (e.g., drusen and subretinal drusenoid deposits in age-related macular degeneration [AMD]) while accounting for varying autofluorescence levels throughout the fundus.

Fundus autofluorescence (FAF) imaging allows the noninvasive mapping of intrinsic fluorophores of the ocular fundus, particularly the retinal pigment ...

Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition

The goal of this protocol is to develop a standardized method for acquiring images of the optic nerve sheath and measuring the optic nerve sheath diameter (ONSD). Diagnostic ultrasound of the ONSD to detect intracranial hypertension has traditionally faced many problems because of methodologic discrepancies. Due to inconsistencies in the measuring techniques, the potential for ONSD to become a non-invasive bedside monitoring tool for ICP has been hampered. However, establishing a transparent, consistent methodology for measuring the ONSD would support its use as a valid and reliable method of identifying intracranial hypertension. This is important as it has both high sensitivity and specificity in acute care settings. This narrative review describes ONSD POCUS image acquisition, including patient positioning, transducer selection, probe placement, the acquisition sequence, and image optimization. Further, visual aids are provided to assist in real-time during image acquisition. This method should be considered for patients for whom there are concerns regarding intracranial hypertension but who do not have an intracranial monitor in place.

Point-of-care ultrasound (POCUS) of the optic nerve sheath diameter (ONSD) has been shown to be useful in identifying patients with increased intracranial pressure (ICP). However, the non-standardized technique for this POCUS has hampered its use. We present a standardized image acquisition protocol for use in the acute care setting.

The goal of this protocol is to develop a standardized method for acquiring images of the optic nerve sheath and measuring the optic nerve sheath diameter ...

Focused Assessment with Sonography for Trauma (FAST) Exam: Image Acquisition

Over the past twenty years, the Focused Assessment with Sonography for Trauma (FAST) exam has transformed the care of patients presenting with a combination of trauma (blunt or penetrating) and hypotension. In these hemodynamically unstable trauma patients, the FAST exam permits rapid and noninvasive screening for free pericardial or peritoneal fluid, the latter of which implicates intra-abdominal injury as a likely contributor to the hypotension and justifies emergent abdominal surgical exploration. Further, the abdominal portion of the FAST exam can also be used outside of the trauma setting to screen for free peritoneal fluid in patients who become hemodynamically unstable in any context, including after procedures that may inadvertently injure abdominal organs. These "non-trauma" situations of hemodynamic instability are often triaged by providers from specialties other than emergency medicine or trauma surgery who are not familiar with the FAST exam. Therefore, there is a need to promulgate knowledge about the FAST exam to all clinicians caring for critically ill patients. Toward this end, this article describes FAST exam image acquisition: patient positioning, transducer selection, image optimization, and exam limitations. Since the free fluid is likely to be found in specific anatomic locations that are unique for each canonical FAST exam view, this work centers on the unique image acquisition considerations for each window: subcostal, right upper quadrant, left upper quadrant, and pelvis.

Focused Assessment with Sonography for Trauma FAST Exam: Image Acquisition

The Focused Assessment with Sonography for Trauma (FAST) exam is a diagnostic point-of-care ultrasound examination used to screen for the presence of free fluid in the pericardium and peritoneum. Indications, techniques, and pitfalls of the procedure are discussed in this article.

Over the past twenty years, the Focused Assessment with Sonography for Trauma (FAST) exam has transformed the care of patients presenting with a ...

Gastric Ultrasound Technique for Mitigating Peri-Procedural Aspiration Risk

Gastric Point of Care Ultrasound in Adults: Image Acquisition and Interpretation

Over the past two decades, diagnostic point-of-care ultrasound (POCUS) has emerged as a rapid and non-invasive bedside tool for addressing clinical inquiries related to gastric content. One emerging concern pertains to patients about to undergo sedation and/or endotracheal intubation: the elevated risk of aspiration from the patient&#39;s stomach contents. Aspiration of gastric contents into the lungs poses a serious and potentially life-threatening complication. This occurs more frequently when the stomach is considered &#34;full&#34; and can be affected by the techniques employed for airway management, making it potentially preventable. To mitigate the risk of peri-procedural aspiration, two distinct medical specialties (anesthesiology and critical care medicine) have independently developed techniques to utilize ultrasonography for identifying patients requiring &#34;full stomach&#34; precautions. Due to these separate specialties, the work of each group remains relatively unfamiliar outside its respective field. This article presents descriptions of both techniques for gastric ultrasound. Furthermore, it explains how these approaches can complement each other when one of them falls short. Regarding image acquisition, the article covers the following topics: indications and contraindications, selection of the appropriate probe, patient positioning, and troubleshooting. The article also delves into image interpretation, complete with example images. Additionally, it demonstrates how one of the two techniques can be employed to estimate gastric fluid volume. Lastly, the article briefly discusses medical decision-making based on the findings of this examination.

Author Spotlight: Point-of-Care Ultrasound for Gastric Content Assessment and Risk Stratification in Perioperative Care 

This protocol introduces two methods for image acquisition in gastric ultrasonography. Additionally, tips are provided for interpreting this information to assist in medical decision-making.

Over the past two decades, diagnostic point-of-care ultrasound (POCUS) has emerged as a rapid and non-invasive bedside tool for addressing clinical ...