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Alzimami K, Alanazi S, Gannam M, Alanazi A, Aljamaz I, Alyanbawi S, Alotaibi B, Almalki Y, Sulieman A, Sassi S. Evaluation of the Small-animal Nano Scan PET/CT System using 89Zr. Curr Med Imaging 2021; 17:296-305. [PMID: 33045969 DOI: 10.2174/1573405616666201012154548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 07/24/2020] [Accepted: 09/15/2020] [Indexed: 11/22/2022]
Abstract
INTRODUCTION The purpose of the present work was to evaluate the imaging characteristics of 89Zr-PET in comparison with those obtained using fluorine-18 Fluorodeoxyglucose (18FFDG) PET (a gold standard tracer in PET imaging) using a small-animal NanoScan PET/CT scanner. METHODS The system's spatial resolution, sensitivity, uniformity, and image quality were measured on a Nano Scan small-animal PET/CT scanner according to the NEMA NU4-2008 protocols. For reconstruction images, we used 2D and 3D reconstruction algorithms. The reconstruction methods included filter back projection (FBP), the ordered subsets expectation maximization (OSEM) algorithm, and the 3D Tera-Tomo algorithm, which are developed for the NanoScan small-animal PET/CT scanner. RESULTS The results obtained showed a significant difference in the spatial resolution for 89Zr as compared to 22Na and 18F when using a 2D reconstruction algorithm. The spatial resolution values were much enhanced by using the 3D Tera-Tomo reconstruction for each isotope, the Full width at half maximum (FWHM) values was less than 1 for all isotopes at the center of the field of view (FOV). This difference in spatial resolution is dependent on the positron range, energy, and the reconstruction method. CONCLUSION The long half-life of 89Zr makes it an ideal positron emitter for performing immuno- PET, which is matched with the biological half-life of intact mAbs.89Zr can also give several advantages over other long half-life positron emitters in relation to the overall imaging performance because of its relatively short positron range and simpler decay scheme. The values of 89Zr sensitivity that were obtained in the present study were less than those of previous studies.
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Affiliation(s)
- Khalid Alzimami
- Department of Radiological Sciences, College of Applied Sciences, King Saud University P. O.Box 10219, Riyadh 11433, Saudi Arabia
| | - Sitah Alanazi
- Department of Physics, College of Science, Imam Muhammad Ibn Saud Islamic University, Riyadh 11461, Saudi Arabia
| | - Magdi Gannam
- Department of Physics and Astronomy, King Saud University, Riyadh, Saudi Arabia
| | - Ahmad Alanazi
- Department of Radiological Sciences, College of Applied Sciences, King Saud University P. O.Box 10219, Riyadh 11433, Saudi Arabia
| | - Ibrahim Aljamaz
- Department of Cyclotron and Radiopharmaceuticals, King Faisal Specialist Hospital and Research Centre, P.O. Box 3354, Riyadh 11211, Saudi Arabia
| | - Suliman Alyanbawi
- Department of Cyclotron and Radiopharmaceuticals, King Faisal Specialist Hospital and Research Centre, P.O. Box 3354, Riyadh 11211, Saudi Arabia
| | - Basem Alotaibi
- Department of Cyclotron and Radiopharmaceuticals, King Faisal Specialist Hospital and Research Centre, P.O. Box 3354, Riyadh 11211, Saudi Arabia
| | - Yousif Almalki
- Department of Cyclotron and Radiopharmaceuticals, King Faisal Specialist Hospital and Research Centre, P.O. Box 3354, Riyadh 11211, Saudi Arabia
| | - Abdelmoneim Sulieman
- Department of Radiology and Medical Imaging, College of Applied Medical Sciences, Salman bin Abdulaziz University. P.O.Box 422, Alkharj 11943, Saudi Arabia
| | - Salem Sassi
- Department of Medical Physics, Prince Sultan Military Medical City, Riyadh, Saudi Arabia
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Zr-89 Immuno-PET Targeting Ectopic ATP Synthase Enables In-Vivo Imaging of Tumor Angiogenesis. Int J Mol Sci 2019; 20:ijms20163928. [PMID: 31412537 PMCID: PMC6720485 DOI: 10.3390/ijms20163928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 08/07/2019] [Accepted: 08/12/2019] [Indexed: 12/23/2022] Open
Abstract
In this study, we synthesized a Zr-89-labeled anti-adenosine triphosphate synthase monoclonal antibody (ATPS mAb) for applications in immuno-positron emission tomography (PET) and evaluated its feasibility for angiogenesis imaging. The cellular uptake of Zr-89 ATPS mAb was measured after treatment of cancer cell lines in vitro, and its biodistribution was evaluated at 4, 24 and 48 h in vivo in mice bearing xenografts. PET images were acquired at 4, 24, 48, and 96 h after Zr-89 ATPS mAb administration. Tumor angiogenesis was analyzed using anti-CD31 immunofluorescence staining. The cellular uptake of Zr-89 ATPS mAb increased over time in MDA-MB-231 breast cancer cells but did not increase in PC3 prostate cancer cells. The tumor uptake of Zr-89 ATPS mAb at 24 h was 9.4 ± 0.9% ID/g for MDA-Mb-231 cells and was 3.8 ± 0.6% ID/g for PC3 cells (p = 0.004). Zr-89 ATPS mAb uptake in MDA-MB-231 xenografts was inhibited by the administration of cold ATPS mAb (4.4 ± 0.5% ID/g, p = 0.011). Zr-89 ATPS mAb uptake could be visualized by PET for up to 96 h in MDA-MB-231 tumors. In contrast, there was no distinct tumor uptake detected by PET in the PC3 xenograft model. CD31-positive tumor vessels were abundant in MDA-MB-231 tumors, whereas they were scarcely detected in PC3 tumors. In conclusion, ATPS mAb was successfully labeled with Zr-89, which could be used for immuno-PET imaging targeting tumor angiogenesis.
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Lee S, Kim H, Kang YR, Kim H, Kim JY, Lee YJ, Kim JM, Kim JS. Selection Criteria for Determination of Optimal Reconstruction Method for Cu-64 Trastuzumab Dosimetry on Siemens Inveon PET Scanner. J Clin Med 2019; 8:jcm8040512. [PMID: 31014003 PMCID: PMC6518359 DOI: 10.3390/jcm8040512] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 04/03/2019] [Accepted: 04/10/2019] [Indexed: 11/16/2022] Open
Abstract
The goal of this study was to suggest criteria for the determination of the optimal image reconstruction algorithm for image-based dosimetry of Cu-64 trastuzumab PET in a mouse model. Image qualities, such as recovery coefficient (RC), spill-over ratio (SOR), and non-uniformity (NU), were measured according to National Electrical Manufacturers Association (NEMA) NU4-2008. Mice bearing a subcutaneous tumor ( 200 mm 3 , HER2 NCI N87) were injected with monoclonal antibodies (trastuzumab) with Cu-64. Preclinical mouse PET images were acquired at 4 time points after injection (2, 15, 40 and 64 h). Phantom and Cu-64 trastuzumab PET images were reconstructed using various reconstruction algorithms (filtered back projection (FBP), 3D reprojection algorithm (FBP-3DRP), 2D ordered subset expectation maximization (OSEM 2D), and OSEM 3D maximum a posteriori (OSEM3D-MAP)) and filters. The absorbed dose for the tumor and the effective dose for organs for Cu-64 trastuzumab PET were calculated using the OLINDA/EXM program with various reconstruction algorithms. Absorbed dose for the tumor ranged from 923 mGy/MBq to 1830 mGy/MBq with application of reconstruction algorithms and filters. When OSEM2D was used, the effective osteogenic dose increased from 0.0031 to 0.0245 with an increase in the iteration number (1 to 10). In the region of kidney, the effective dose increased from 0.1870 to 1.4100 when OSEM2D was used with iteration number 1 to 10. To determine the optimal reconstruction algorithms and filters, a correlation between RC and NU was plotted and selection criteria (0.9 < RC < 1.0 and < 10% of NU) were suggested. According to the selection criteria, OSEM2D (iteration 1) was chosen for the optimal reconstruction algorithm. OSEM2D (iteration 10) provided 154.7% overestimated effective dose and FBP with a Butterworth filter provided 20.9% underestimated effective dose. We suggested OSEM2D (iteration 1) for the calculation of the effective dose of Cu-64 trastuzumab on an Inveon PET scanner.
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Affiliation(s)
- Seonhwa Lee
- Division of RI Application, Korea Institute of Radiological and Medical Sciences (KIRAMS), 75 Nowon-ro, Nowon-gu, Seoul 01812, Korea.
- Department of Bio-Convergence Engineering, Korea University, Seoul 02856, Korea.
| | - Hyeongi Kim
- Division of RI Application, Korea Institute of Radiological and Medical Sciences (KIRAMS), 75 Nowon-ro, Nowon-gu, Seoul 01812, Korea.
| | - Ye-Rin Kang
- Radiologicial and Medico-Oncological Sciences Major, University of Science and Technology (UST), Seoul 01812, Korea.
- School of Health and Environmental Science, College of Health Science, Korea University, Seoul 02856, Korea.
| | - Hyungwoo Kim
- Radiologicial and Medico-Oncological Sciences Major, University of Science and Technology (UST), Seoul 01812, Korea.
- College of Korean Medicine, Kyung Hee University, Seoul 02454, Korea.
| | - Jung Young Kim
- Division of RI Application, Korea Institute of Radiological and Medical Sciences (KIRAMS), 75 Nowon-ro, Nowon-gu, Seoul 01812, Korea.
| | - Yong-Jin Lee
- Division of RI Application, Korea Institute of Radiological and Medical Sciences (KIRAMS), 75 Nowon-ro, Nowon-gu, Seoul 01812, Korea.
| | - Jung Min Kim
- Department of Bio-Convergence Engineering, Korea University, Seoul 02856, Korea.
| | - Jin Su Kim
- Division of RI Application, Korea Institute of Radiological and Medical Sciences (KIRAMS), 75 Nowon-ro, Nowon-gu, Seoul 01812, Korea.
- Radiologicial and Medico-Oncological Sciences Major, University of Science and Technology (UST), Seoul 01812, Korea.
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Gaitanis A, Kastis GA, Vlastou E, Bouziotis P, Verginis P, Anagnostopoulos CD. Investigation of Image Reconstruction Parameters of the Mediso nanoScan PC Small-Animal PET/CT Scanner for Two Different Positron Emitters Under NEMA NU 4-2008 Standards. Mol Imaging Biol 2018; 19:550-559. [PMID: 27995432 DOI: 10.1007/s11307-016-1035-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE The Tera-Tomo 3D image reconstruction algorithm (a version of OSEM), provided with the Mediso nanoScan® PC (PET8/2) small-animal positron emission tomograph (PET)/x-ray computed tomography (CT) scanner, has various parameter options such as total level of regularization, subsets, and iterations. Also, the acquisition time in PET plays an important role. This study aims to assess the performance of this new small-animal PET/CT scanner for different acquisition times and reconstruction parameters, for 2-deoxy-2-[18F]fluoro-D-glucose ([18F]FDG) and Ga-68, under the NEMA NU 4-2008 standards. PROCEDURES Various image quality metrics were calculated for different realizations of [18F]FDG and Ga-68 filled image quality (IQ) phantoms. RESULTS [18F]FDG imaging produced improved images over Ga-68. The best compromise for the optimization of all image quality factors is achieved for at least 30 min acquisition and image reconstruction with 52 iteration updates combined with a high regularization level. CONCLUSION A high regularization level at 52 iteration updates and 30 min acquisition time were found to optimize most of the figures of merit investigated.
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Affiliation(s)
- Anastasios Gaitanis
- PET/CT Department and Small Animal PET/CT Unit, Centre for Clinical Research, Experimental Surgery & Translational Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), Athens, Greece.
| | - George A Kastis
- Research Center of Mathematics, Academy of Athens, Athens, Greece
- Radiochemical Studies Laboratory, Institute of Nuclear and Radiological Sciences & Technology, Energy & Safety (I.N.RA.S.T.E.S.), N.C.S.R. "Demokritos", Athens, Greece
| | - Elena Vlastou
- PET/CT Department and Small Animal PET/CT Unit, Centre for Clinical Research, Experimental Surgery & Translational Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), Athens, Greece
| | - Penelope Bouziotis
- Radiochemical Studies Laboratory, Institute of Nuclear and Radiological Sciences & Technology, Energy & Safety (I.N.RA.S.T.E.S.), N.C.S.R. "Demokritos", Athens, Greece
| | - Panayotis Verginis
- Division of Clinical, Experimental Surgery, and Translational Research, Biomedical Research Foundation, Academy of Athens, 4 Soranou Efessiou Street, Athens, Greece
| | - Constantinos D Anagnostopoulos
- PET/CT Department and Small Animal PET/CT Unit, Centre for Clinical Research, Experimental Surgery & Translational Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), Athens, Greece
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