The authors acknowledge all the staff involved in 68Ga-DOTATATE PET/CT imaging at the department of Nuclear Medicine at the Netherlands Cancer Institute.

1. General radiation and radiopharmaceutical safety
<ol>
	<li>Ensure that radioactive materials are only worked with and handled by trained personnel. The dose to hospital staff, patients, and everyone else present should always be kept as low as reasonably achievable (ALARA).</li>
	<li>Regarding the preparation of radiopharmaceuticals, adhere to national laws, regulations, and guidelines, such as Good Manufacturing Practice (GMP). 
	CAUTION: The following protocol is for the 68Ga-DOTATATE PET/CT imagin...

<ol>
	<li>Oronsky, B., Ma, P. C., Morgensztern, D., Carter, C. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Nothing+but+NET:+A+Review+of+Neuroendocrine+Tumors+and+Carcinomas.">Nothing but NET: A Review of Neuroendocrine Tumors and Carcinomas.</a> Neoplasia. 19 (12), 991-1002 (2017).</li><li>Dasari, 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=Trends+in+the+Incidence,+Prevalence,+and+Survival+Outcomes+in+Patients+With+Neuroendocrine+Tumors+in+the+United+States.">Trends in the Incidence, Prevalence, and Survival Outcomes in Patients With Neuroendocrine Tumors in the United States.</a> JAMA Oncology. 3 (10), 1335-1342 (2017).</li><li>Krenning, E. P., 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=Localistion+of+endocrine-related+tumours+with+radioiodinated+analogue+of+somatostatin.">Localistion of endocrine-related tumours with radioiodinated analogue of somatostatin.</a> The Lancet. 333 (8632), 242-244 (1989).</li><li>Krenning, E. P., 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=Somatostatin+receptor+scintigraphy+with+[111In-DTPA-D-Phe1]-+and+[123I-Tyr3]-octreotide:+the+Rotterdam+experience+with+more+than+1000+patients.">Somatostatin receptor scintigraphy with [111In-DTPA-D-Phe1]- and [123I-Tyr3]-octreotide: the Rotterdam experience with more than 1000 patients.</a> European Journal of Nuclear Medicine. 20 (8), 716-731 (1993).</li><li>Balon, H. R., 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=Procedure+guideline+for+somatostatin+receptor+scintigraphy+with+(111)In-pentetreotide.">Procedure guideline for somatostatin receptor scintigraphy with (111)In-pentetreotide.</a> Journal of Nuclear Medicine. 42 (7), 1134-1138 (2001).</li><li>Kayani, I., 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=Functional+Imaging+of+Neuroendocrine+Tumors+With+Combined+PET/CT+Using+68Ga-DOTATATE+(Dota-DPhe1,Tyr3-octreotate)+and+18F-FDG.">Functional Imaging of Neuroendocrine Tumors With Combined PET/CT Using 68Ga-DOTATATE (Dota-DPhe1,Tyr3-octreotate) and 18F-FDG.</a> Cancer. 112 (11), 2447-2455 (2008).</li><li>Hofman, M. S., Kong, G., Neels, O. C., Hong, E., Hicks, R. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High+management+impact+of+Ga-68+DOTATATE+(GaTate)+PET/CT+for+imaging+neuroendocrine+and+other+somatostatin+expressing+tumours.">High management impact of Ga-68 DOTATATE (GaTate) PET/CT for imaging neuroendocrine and other somatostatin expressing tumours.</a> Journal of Medical Imaging and Radiation Oncology. 56 (1), 40-47 (2012).</li><li>Srirajaskanthan, R., 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=The+role+of+68Ga-DOTATATE+PET+in+patients+with+neuroendocrine+tumors+and+negative+or+equivocal+findings+on+111In-DTPA-octreotide+scintigraphy.">The role of 68Ga-DOTATATE PET in patients with neuroendocrine tumors and negative or equivocal findings on 111In-DTPA-octreotide scintigraphy.</a> Journal of Nuclear Medicine. 51 (6), 875-882 (2010).</li><li>Deppen, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=68Ga-DOTATATE+Compared+with+111In-DTPA-Octreotide+and+Conventional+Imaging+for+Pulmonary+and+Gastroenteropancreatic+Neuroendocrine+Tumors:+A+Systematic+Review+and+Meta-Analysis.">68Ga-DOTATATE Compared with 111In-DTPA-Octreotide and Conventional Imaging for Pulmonary and Gastroenteropancreatic Neuroendocrine Tumors: A Systematic Review and Meta-Analysis.</a> Journal of Nuclear Medicine. 57 (6), 872-878 (2016).</li><li>Yang, J., 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=Diagnostic+role+of+Gallium-68+DOTATOC+and+Gallium-68+DOTATATE+PET+in+patients+with+neuroendocrine+tumors:+a+meta-analysis.">Diagnostic role of Gallium-68 DOTATOC and Gallium-68 DOTATATE PET in patients with neuroendocrine tumors: a meta-analysis.</a> Acta Radiologica. 55 (4), 389-398 (2014).</li><li>Barrio, M., 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=The+Impact+of+Somatostatin+Receptor-Directed+PET/CT+on+the+Management+of+Patients+with+Neuroendocrine+Tumor:+A+Systematic+Review+and+Meta-Analysis.">The Impact of Somatostatin Receptor-Directed PET/CT on the Management of Patients with Neuroendocrine Tumor: A Systematic Review and Meta-Analysis.</a> Journal of Nuclear Medicine. 58 (5), 756-761 (2017).</li><li>Strosberg, J. R., 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=The+North+American+Neuroendocrine+Tumor+Society+Consensus+Guidelines+for+Surveillance+and+Medical+Management+of+Midgut+Neuroendocrine+Tumors.">The North American Neuroendocrine Tumor Society Consensus Guidelines for Surveillance and Medical Management of Midgut Neuroendocrine Tumors.</a> Pancreas. 46 (6), 707-714 (2017).</li><li>Virgolini, I., 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=Procedure+guidelines+for+PET/CT+tumour+imaging+with+68Ga-DOTA-conjugated+peptides:+68Ga-DOTA-TOC,+68Ga-DOTA-NOC,+68Ga-DOTA-TATE.">Procedure guidelines for PET/CT tumour imaging with 68Ga-DOTA-conjugated peptides: 68Ga-DOTA-TOC, 68Ga-DOTA-NOC, 68Ga-DOTA-TATE.</a> European Journal of Nuclear Medicine and Molecular Imaging. 67 (10), 2004-2010 (2010).</li><li>European Directorate for the Quality of Medicines &#38; Healthcare (EDQM). <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Monograph+01/2013:2482+Gallium+(68Ga)+edotreotide+injection.">Monograph 01/2013:2482 Gallium (68Ga) edotreotide injection.</a> European Pharmacopoeia 9th Edition. , (2017).</li><li>Brogsitter, 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=Twins+in+spirit+part+II:+DOTATATE+and+high-affinity+DOTATATE+&#8211;+the+clinical+experience.">Twins in spirit part II: DOTATATE and high-affinity DOTATATE &#8211; the clinical experience.</a> European Journal of Nuclear Medicine and Molecular Imaging. 41 (6), 1158-1165 (2014).</li><li>Sandstr&#246;m, M., 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=Comparative+biodistribution+and+radiation+dosimetry+of+68Ga-DOTATOC+and+68Ga-DOTATATE+in+patients+with+neuroendocrine+tumors.">Comparative biodistribution and radiation dosimetry of 68Ga-DOTATOC and 68Ga-DOTATATE in patients with neuroendocrine tumors.</a> Journal of Nuclear Medicine. 54 (10), 1755-1759 (2013).</li><li>Aalbersberg, E. 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=Influence+of+lanreotide+on+uptake+of+68Ga-DOTATATE+in+patients+with+neuroendocrine+tumours:+a+prospective+intra-patient+evaluation.">Influence of lanreotide on uptake of 68Ga-DOTATATE in patients with neuroendocrine tumours: a prospective intra-patient evaluation.</a> European Journal of Nuclear Medicine and Molecular Imaging. , (2018).</li></ol>

This protocol describes the production and subsequent PET/CT imaging of 68Ga-DOTATATE. In order for the efficient use of each produced batch of 68Ga-DOTATATE, an optimal workflow with strict timing is required. Since the half-life of 68Ga is 68 min, a relatively small time delay of 15 min leads to a 15% loss of radioactivity. This requires active communication between the production facility, the personnel administrating the dose to the patient, and the PET/CT technician. Also, patients s...

NETs are a heterogeneous group of tumors that arises from neuroendocrine cells. They can occur at almost any location in the body but are most common in the gastrointestinal tract, pancreas, and lung1. Although NETs are a rare disease, their incidence in the United States has risen from 1.09 per 100,000 people in 1973 to 6.98 per 100,000 people in 20122. For an accurate diagnosis and staging of a NET, 68Ga-DOTATATE PET/CT is the standard of care. This protocol describes the production and quality control of 68Ga-DOTATATE, as well as patient preparation and the acquisition of PET/CT images.
Well-differentiated NETs are characterized by an overexpression of somatostatin receptors1. Somatostatin analogs that bind to this receptor can be labeled with a radioactive isotope to allow for nuclear medicine imaging. At first, iodine-123 was used with gamma camera imaging, which was soon replaced by indium-111 (111In)3,4. 111In-octreotide scintigraphy was the golden standard for nuclear medicine NET imaging for over a decade5. Meanwhile, technical advances were made in PET, which has a higher sensitivity and resolution than gamma camera imaging. For NETs, somatostatin analogs coupled to the positron emitter 68Ga, such as 68Ga-DOTATATE, were developed6.
68Ga-somatostatin receptor (68Ga-SRS) PET/CT is the current modality of choice in nuclear medicine imaging of well-differentiated NETS. The superiority of 68Ga-SRS PET/CT over 111In-octreotide has been demonstrated in several studies7,8. The reported sensitivity and specificity lie around 90%-95% and 85%-100%, respectively9,10. A meta-analysis has shown that 68Ga-SRS PET/CT leads to a change in management in 44% of cases, even if preceded by 111In-octreotide scintigraphy11. In guidelines, 68Ga-SRS PET/CT is now recommended over 111In-octreotide scintigraphy for NET imaging, and it is also approved by the Food and Drug Administration and European Medicines Agency12. A guideline for tumor imaging with 68Ga-conjugated peptides is also available13.
This protocol details the radiolabeling of 68Ga-DOTATATE (conform the quality control requirements of the European Pharmacopoeia14), patient preparation, and subsequent PET/CT imaging. Radiation safety and time constrictions due to the short half-life of 68Ga are taken into account.

<table border="0" cellpadding="0" cellspacing="0" style="width:713px;" width="713">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Acetonitrile</td>
			<td style="width:156px;">Biosolve</td>
			<td style="width:119px;">012007</td>
			<td style="width:223px;">&#62; 99.9 %</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Ammonium acetate</td>
			<td style="width:156px;">Merck</td>
			<td style="width:119px;">101116</td>
			<td>&#8805; 98 %</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Aqua / Water for injections</td>
			<td style="width:156px;">Braun</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Automated labeling system</td>
			<td style="width:156px;">Scintomics</td>
			<td style="width:119px;"></td>
			<td>GRP 3V</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">C-18 cartridge</td>
			<td style="width:156px;">Waters</td>
			<td style="width:119px;">WAT023501</td>
			<td>Sep-Pak C18 Plus Light</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Dose calibrator</td>
			<td style="width:156px;">Veenstra Instruments</td>
			<td style="width:119px;"></td>
			<td>VIK-202-5051</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">EDTA</td>
			<td style="width:156px;">Merck</td>
			<td style="width:119px;">324503</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Ethanol</td>
			<td style="width:156px;">Sigma Aldrich</td>
			<td style="width:119px;">32221-M</td>
			<td>&#8805; 99.8 %</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Ga-68 labeling kit</td>
			<td style="width:156px;">ABX</td>
			<td style="width:119px;">SC-01</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Ge-68/Ga-68 generator</td>
			<td style="width:156px;">Eckert &#38; Ziegler</td>
			<td style="width:119px;"></td>
			<td>1850 MBq</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">HA-DOTATATE</td>
			<td style="width:156px;">Scintomics</td>
			<td style="width:119px;">GRPC/R-000095</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">HCl 0.1M for elution</td>
			<td style="width:156px;">ABX</td>
			<td style="width:119px;">HCl-03</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">HEPES</td>
			<td style="width:156px;">Sigma Aldrich</td>
			<td style="width:119px;">H3375</td>
			<td>&#8805; 99.5 %</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Iodine</td>
			<td style="width:156px;">Sigma Aldrich</td>
			<td style="width:119px;">207772</td>
			<td>&#8805; 99.8 %, solid</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">ITLC-SG F254 plates</td>
			<td style="width:156px;">Merck</td>
			<td style="width:119px;">105735</td>
			<td>TLC Silica gel 60 F254</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">ITLC-SG paper</td>
			<td style="width:156px;">Agilent</td>
			<td style="width:119px;">SGI0001</td>
			<td>Glass fiber</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Methanol</td>
			<td style="width:156px;">Sigma Aldrich</td>
			<td style="width:119px;">32213-M</td>
			<td>&#8805; 99.8 %, Ph. Eur.&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Non-vented filter</td>
			<td style="width:156px;">Merck</td>
			<td>SLMPL25SS</td>
			<td>Millex-MP filter 0.22 &#181;m</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">PET/CT</td>
			<td style="width:156px;">Philips</td>
			<td style="width:119px;"></td>
			<td>Gemini TOF</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">pH indicator strips</td>
			<td style="width:156px;">Merck</td>
			<td style="width:119px;">109584</td>
			<td>MColorpHast (pH2.0-9.0)</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Tryptic soy broth medium</td>
			<td style="width:156px;">Biotrading</td>
			<td>K111F010QK</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Vented filter</td>
			<td style="width:156px;">Merck</td>
			<td style="width:119px;">SLGV0250S&#160;</td>
			<td>Cathivex GV 0.22 &#181;m</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Well counter</td>
			<td style="width:156px;">Canberra (now Mirion)</td>
			<td style="width:119px;"></td>
			<td style="width:223px;">Osprey Digital Tube Base MCA 
			Detector 76 BP76/3M-X</td>
		</tr>
	</tbody>
</table>

a practical guide for the production and pet/ct imaging of 68ga-dotatate for neuroendocrine tumors in daily clinical practice

Neuroendocrine tumors are a rare form of cancer that arise from neuroendocrine cells and can be present at almost any location throughout the body. Although heterogeneous in presentation, a common denominator among these tumors is the overexpression of somatostatin receptors. 68Ga-DOTATATE is a somatostatin analog labeled with the positron emitter gallium-68 (68Ga). For well-differentiated neuroendocrine tumors, 68Ga-DOTATATE positron emission tomography (PET)/computed tomography (CT) imaging is used for diagnosis, determination of disease burden, and therapy selection.
This protocol details the radiolabeling of 68Ga-DOTATATE, quality control, patient preparation, and subsequent PET/CT imaging. Radiolabeling of 68Ga-DOTATATE is performed with a fully automated labeling module coupled to a germanium-68 (68Ge)/68Ga generator. Quality control of the final product evaluates radiochemical purity with instant thin-layer chromatography and solid-phase chromatography, and pH prior to patient injection. Periodic quality control is performed to determine 68Ge breakthrough, sterility, and (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) content. Patient preparation includes patient instructions, a protocol for 68Ga-DOTATATE during treatment with somatostatin analogs, and intravenous administration of the radiopharmaceutical. For PET/CT imaging, the acquisition and reconstruction settings are described. For each step, radiation safety will be highlighted, as well as time constrictions due to the short half-life of 68Ga.
Fully automated in-house production and quality control of 68Ga-DOTATATE leads to very high success rates (95%) and produces two to four patient dosages per batch, depending on the yield of the generator. In conclusion, 68Ga-DOTATATE PET/CT imaging is a noninvasive and fast method of providing information on the tumor burden of neuroendocrine tumors (NETs) while also assisting in diagnosis and therapy selection.

Making use of an automated labeling system, 357 batches of 68Ga-DOTATATE were produced between December 2014 and October 2018. Of the 357 produced, 17 batches failed and 340 batches were released, leading to an overall success rate of 95.2%. Of the failed batches, 11 were caused by a technical failure, whilst in six cases, the produced 68Ga-DOTATATE did not meet specifications. Figure 1 shows a flow chart of produced batches and the numb...

Watch this Scientific Journal Video about A Practical Guide for the Production and PET/CT Imaging of 68Ga-DOTATATE for Neuroendocrine Tumors in Daily Clinical Practice at JoVE.com

A Practical Guide for the Production and PET/CT Imaging of 68Ga-DOTATATE for Neuroendocrine Tumors in Daily Clinical Practice

Well-differentiated neuroendocrine tumors overexpress somatostatin receptors which can be utilized for diagnostic imaging with the radiolabeled somatostatin analog 68Ga-DOTATATE. This protocol details the radiolabeling of 68Ga-DOTATATE, quality control, patient preparation, and subsequent PET/CT imaging. Radiation safety and time constrictions due to the short half-life of 68Ga are taken into account.

A Practical Guide for the Production and PET/CT Imaging of 68Ga-DOTATATE for Neuroendocrine Tumors in Daily Clinical Practice

Neuroendocrine tumors are a rare form of cancer that arise from neuroendocrine cells and can be present at almost any location throughout the body. ...

This protocol describes the synthesis and quality control of gallium DOTATATE and the subsequent acquisition of a gallium DOTATATE PET/CT scan. The main advantage of this technique is that it provides high quality gallium DOTATATE within a timeframe suitable for working with an isotope of a short half-life. Demonstrating the procedures will be Else von Bele and Marine Decker, nuclear medicine technologists at our department.At least two hours before patient administration place the gallium-68 labeling kit on the labeling module according to the manufacturer's specifications, and place the materials in the correct position. Attach the solutions provided in the gallium-68 labeling kit to the manifolds. And attach the sterile vial with the non-vented filter to the output of the labeling module.Place the vial in a lead shield sufficient for positron emitters. And attach the output of the 68-gallium generator to the input of the labeling module. Dissolve 50 micrograms of peptide analog into 1.5 milliliters of 1.5 molar HEPES buffer solution provided in the kit, and transfer the peptide to the reaction vial.Close the lead shielding around the labeling module and start the production of the gallium-68 DOTATATE via the tablet computer attached to the labeling module. When the synthesis is finished, remove the needles with filters from the glass vial and close the lead shield around the vial. Place the vial in a dose calibrator to measure the activity of gallium-68 DOTATATE and note the activity reference time.Then in a sterile environment, remove 0.5 milliliters of the labeled peptide from the vial for quality control, and prepare syringes for the patient administration. To confirm the quality of the synthesized peptide before the administration, visually inspect the final gallium-68 DOTATATE product to ensure that it is a colorless liquid without any particles. Use a pH indicator strip to measure the pH of the solution.The pH should lie between 6.5 and 7.5. Next, to measure the gallium-68 colloids add 20 microliters of the labeled peptide to 500 microliters of water. And homogenize the dilution with careful shaking of the vial.Next add five microliters of the dilution about 1.5 centimeters from the bottom of a seven-centimeter long, one-centimeter wide strip of instant thin layer chromatography silica gel glass fiber paper. And place the paper in a tube containing two milliliters of a 50-50 methanol to one molar ammonium acetate solution taking care that the peptide does not come into contact with the solution. Close the tube to prevent evaporation and wait several minutes until the solvent has traveled at least five centimeters above where the peptide was applied.Next, cut the paper in half and place the bottom and upper halves in separate tubes. Then place the tubes in a well counter and determine the number of counts in each vial in the 400 to 600 electron volt energy window for 30 seconds to determine the colloid percentage. To determine the 68-gallium ions dilute 20 microliters of gallium-68 DOTATATE in one milliliter of five millimolar EDTA.Then dilute 10 microliters of the peptide EDTA solution in one milliliter of sterile water, and place the solution in a well counter to determine the number of counts in the 400 to 600 electron volt energy window for 30 seconds. Slowly flush a C-18 cartridge with one milliliter of 100%ethanol followed by one milliliter of sterile water. Flush the diluted sample through the C-18 cartridge into the collection tube.Rinse the sample tube with one milliliter of water and flush the wash through the column into the collection tube. Place the collecting tube, the empty sample tube, and the syringe in a well counter and determine the number of counts in each material in the 400 to 600 electron volt energy window for 30 seconds to estimate the ion percentage. The radiopharmaceutical purity can then be determined by calculating the total amount of gallium-68 DOTATATE according to the formula.If the radiopharmaceutical purity is at least 91%obtain a short medical history of the patient after check-in taking care to inquire about the date of the last somatostatin analog administration. This is not a contraindication for gallium-68 DOTATATE imaging, but should be noted. When the patient is ready, place an intravenous cannula in the arm, and flush the catheter with saline to verify placement of the cannula.45 minutes prior to the PET/CT imaging inject 100 megabecquerels of gallium-68 into the cannula. Place the patient with the arms above their head on the PET/CT scanner and instruct the patient to remain still throughout the exam. When the patient is in position acquire a survey image and select the scan area from the pituitary gland to the mid thigh.Perform a low dose CT scan with 40 milliamps, 140 electron volts, and five millimolar slices for attenuation correction and anatomical correlation. Then starting at the head of the patient perform a PET scan with 150 seconds per bed position. Here a representative gallium-68 DOTATATE PET/CT scan without evidence of disease is shown.The physiological uptake can be observed in the liver and the spleen. Gallium-68 DOTATATE is excreted by the kidneys and is therefore visible in the urinary track. Here, images from a patient with a primary tumor in the pancreas are shown.This patient was administered a lower dose of gallium-68 DOTATATE due to a delay in the production of the labeled peptide, which led to less activity being present in the patient and two more noisy images. This can be seen in the liver, which is indicated by the red arrow. Here, an image with motion artifact can be observed, which is indicated by the red arrow.Gallium-68 has a short half-life of 68 minutes, therefore, timing is critical in this protocol. This protocol makes use of the positron-emitting isotope gallium-68, therefore adequate protective measures should be taken to keep the radiation exposure of personnel as low as possible.

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JoVE Journal

Cancer Research

16.9K vistas.  Netherlands Cancer Institute. Este protocolo describe la síntesis y el control de calidad del galio DOTATATE y la posterior adquisición de una exploración DE PET/CT DOTATATE de galio. La principal ventaja de esta técnica es que proporciona agua y medio galio DOTATATE de alta calidad dentro de un marco temporal adecuado para trabajar con un isótopo de corta vida media. Demostrando los procedimientos serán Else von Bele y Marine Decker, tecnólogos de medicina nuclear en nuestro departamento.Al menos dos horas ...