Name: in vivo, percutaneous, needle based, optical coherence tomography of renal masses
Uploaded: 2015-03-30T14:00:00
Description: Watch this Scientific Journal Video about In Vivo, Percutaneous, Needle Based, Optical Coherence Tomography of Renal Masses at JoVE.com

This work is funded by the Cure for Cancer Foundation, Dutch Technology Foundation (STW) and The Netherlands Organisation for Health Research and Development (ZonMw).

The presented procedure takes place under a research protocol approved by the Institutional Review Board of the Academic Medical Center Amsterdam, registration number NL41985.018. Written informed consent is required from all participants.
1. System
<ol>
	<li>For this experiment, use a Fourier domain OCT system, operating at a 1,280&#8211;1,350 nm wavelength band 13. Fourier domain low-coherence interferometry allows for continuous scanning which increases the data acquisition spe...

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In this publication we report on the feasibility of percutaneous, needle based, OCT of the kidney. This is an essential first step in the development of OCT into a clinically applicable technique for tumor differentiation, termed as an &#8220;Optical Biopsy&#8221;. Our first 25 patients have shown percutaneous OCT to be an easy and safe procedure. An optical biopsy has two advantages over conventional core biopsies. First, the real time acquisition and analysis of OCT data will provide instant diagnostic results, compare...

The past decades have shown a steady increase in the incidence of renal masses 1,2. Until now, renal mass treatment decisions have been made primarily on the basis of MRI and CT imaging characteristics, age and comorbidity. However these diagnostic methods and clinical parameters lack the finesse to truly detect the malignant potential of a renal mass. A core biopsy or fine needle aspiration with sufficient tissue for pathological evaluation (diagnostic) provides objective tumor differentiation with both sensitivity and specificity in the range of 95-100% 3. Therefore biopsy is gaining acceptance in the evaluation of suspicious renal masses 4,5. However, biopsies without sufficient tissue to establish a diagnosis or with normal renal parenchyma (non-diagnostic) occur at a rate of 10-20% overall, and even up to 30% in small renal masses (&#60;4 cm, SRMs), delaying the diagnostic process due to the frequent necessity for additional biopsy procedures3,5.
Optical coherence tomography (OCT) is a novel imaging modality that has the potential to overcome the aforementioned hurdles in renal mass differentiation. Based on the backscattering of near infrared light, OCT provides images with a 15 &#181;m axial resolution at an effective tissue penetration of 2-3 mm (Figure 1, 2). The loss of signal intensity per millimeter of tissue penetration, a resultant of tissue-specific light scattering, is expressed as the attenuation coefficient (&#181;OCT: mm-1) as described by Faber et al. 6. Histological characteristics can be correlated to &#181;OCT values providing a quantitative parameter for tissue differentiation (Figure 3).
During carcinogenesis, malignant cells display an increased number, larger and more irregularly shaped nuclei with a higher refractive index and more active mitochondria. Due to this overexpression of cell components, a change in &#956;oct is to be expected when comparing malignant tumors to benign tumors or unaffected tissue 7.
Recently we studied the ability of superficial OCT to differentiate between benign and malignant renal masses 8,9. In 16 patients, intra-operative OCT measurements of tumor tissue were obtained using an externally placed OCT probe. The control arm comprised of OCT measurements of unaffected tissue in the same patients. Normal tissue showed a significantly lower median attenuation coefficient compared to malignant tissue, confirming the potential of OCT for tumor differentiation. This quantitative analysis has been applied in a similar fashion to grade other types of malignant tissue, such as urothelial carcinoma 10,11 and vulvar epithelial neoplasia differentiation 12.
We aim to develop OCT into an optical biopsy, providing real-time imaging combined with on-the-spot tumor differentiation. The goal of the current study is to describe a percutaneous, needle based, OCT approach in patients diagnosed with a solid enhancing renal mass. This method description is, to our knowledge, the first to assess the possibility of needle based OCT of renal tumors.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>15G / 7.5cm Co-Axial Introducer Needle</td>
			<td>Angiotech, Gainesville, USA</td>
			<td>MCXS1612SX</td>
			<td></td>
		</tr>
		<tr>
			<td>18G / 20cm Trocar Needle</td>
			<td>Cook medical, Bloomington, USA</td>
			<td>DTN-18-20.0-U</td>
			<td></td>
		</tr>
		<tr>
			<td>16G / 20cm Quick-Core Biopsy Gun</td>
			<td>Cook Medical, Bloomington, USA</td>
			<td>G07827</td>
			<td></td>
		</tr>
		<tr>
			<td>Ilumien Optis PCI Optimization System (OCT &#38; FFR)</td>
			<td>St. Jude medical, St. Paul, USA</td>
			<td>C408650</td>
			<td>Part of Dragonfly Kit. 
			St. Jude medical, St. Paul, USA. (C4088643)</td>
		</tr>
		<tr>
			<td>Dragonfly Duo Imaging Catheter</td>
			<td>LightLab Imaging, Westford, USA</td>
			<td>C408644</td>
			<td>Part of Dragonfly Kit. 
			St. Jude medical, St. Paul, USA. (C4088643)</td>
		</tr>
		<tr>
			<td>Sterile Dock Cover</td>
			<td>CFI Med. Solutions, Fenton, USA</td>
			<td>200-700-00</td>
			<td>Part of Dragonfly Kit. 
			St. Jude medical, St. Paul, USA. (C4088643)</td>
		</tr>
		<tr>
			<td>5ml Luer-lock Syringe</td>
			<td>Merit Med. Syst., South Jordan, USA</td>
			<td>C408647</td>
			<td></td>
		</tr>
		<tr>
			<td>10ml Syringe</td>
			<td>BD, Franklin Lakes, USA</td>
			<td>300912</td>
			<td></td>
		</tr>
		<tr>
			<td>18G Blunt Fill Needle</td>
			<td>BD, Franklin Lakes, USA</td>
			<td>305180</td>
			<td></td>
		</tr>
		<tr>
			<td>21G Injection Needle</td>
			<td>BD, Franklin Lakes, USA</td>
			<td>301155</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile scalpel</td>
			<td>BD, Franklin Lakes, USA</td>
			<td>372611</td>
			<td></td>
		</tr>
		<tr>
			<td>NaCl 0,9% solution</td>
			<td>Braun, Melsungen AG, Germany</td>
			<td>222434</td>
			<td></td>
		</tr>
		<tr>
			<td>Lidoca&#239;ne HCl 2% (20mg/ml) solution</td>
			<td>Braun, Melsungen AG, Germany</td>
			<td>3624480</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile Ultrasound Gel, Aquasonic 100</td>
			<td>Parker Lab. Inc., Fairfield, USA</td>
			<td>GE424609</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile Ultrasound Cover</td>
			<td>Microtek Med., Alpharetta, USA</td>
			<td>PC1289EU</td>
			<td></td>
		</tr>
		<tr>
			<td>Pathology Container</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>AMIRA software package</td>
			<td colspan="2">FEI Visualization Sciences Group, Hillsboro, USA</td>
			<td>Software platform for 3D data analysis</td>
		</tr>
		<tr>
			<td>FIJI software package (open source)</td>
			<td>Open source, http://fiji.sc/Fiji</td>
			<td></td>
			<td>Open source image processing software</td>
		</tr>
	</tbody>
</table>

in vivo, percutaneous, needle based, optical coherence tomography of renal masses

Optical coherence tomography (OCT) is the optical equivalent of ultrasound imaging, based on the backscattering of near infrared light. OCT provides real time images with a 15 &#181;m axial resolution at an effective tissue penetration of 2-3 mm. Within the OCT images the loss of signal intensity per millimeter of tissue penetration, the attenuation coefficient, is calculated. The attenuation coefficient is a tissue specific property, providing a quantitative parameter for tissue differentiation. 
Until now, renal mass treatment decisions have been made primarily on the basis of MRI and CT imaging characteristics, age and comorbidity. However these parameters and diagnostic methods lack the finesse to truly detect the malignant potential of a renal mass. A successful core biopsy or fine needle aspiration provides objective tumor differentiation with both sensitivity and specificity in the range of 95-100%. However, a non-diagnostic rate of 10-20% overall, and even up to 30% in SRMs, is to be expected, delaying the diagnostic process due to the frequent necessity for additional biopsy procedures. 
We aim to develop OCT into an optical biopsy, providing real-time imaging combined with on-the-spot tumor differentiation. This publication provides a detailed step-by-step approach for percutaneous, needle based, OCT of renal masses.

Among the first 25 tumors (23 patients), a total of 24 successful OCT procedures were performed. In one case a probe malfunction led to the inability to acquire an OCT scan. Two adverse events (AE) occurred, which are described in detail in the discussion section. General patient characteristics are found in Table 1.
The OCT console has pre-installed software providing real-time OCT images for immediate qualitative analysis of acquired datasets. For further analysis and attenu...

Watch this Scientific Journal Video about In Vivo, Percutaneous, Needle Based, Optical Coherence Tomography of Renal Masses at JoVE.com

In Vivo, Percutaneous, Needle Based, Optical Coherence Tomography of Renal Masses

Optical coherence tomography (OCT) is a high resolution imaging technique that allows analysis of tissue specific optical properties providing the means for tissue differentiation. We developed needle based OCT, providing real-time imaging combined with on-the-spot tumor differentiation. This publication describes a method for percutaneous, needle based OCT of renal masses.

In Vivo, Percutaneous, Needle Based, Optical Coherence Tomography of Renal Masses

Optical coherence tomography (OCT) is the optical equivalent of ultrasound imaging, based on the backscattering of near infrared light. OCT provides real ...

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