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Marquis, Harry, Willowson, Kathy, Bailey, Dale. (1401). Partial volume effect in SPECT & PET imaging and impact on radionuclide dosimetry estimates. , 11(1), 44-54. doi: 10.22038/aojnmb.2022.63827.1448
Harry Marquis; Kathy P Willowson; Dale L Bailey. "Partial volume effect in SPECT & PET imaging and impact on radionuclide dosimetry estimates". , 11, 1, 1401, 44-54. doi: 10.22038/aojnmb.2022.63827.1448
Marquis, Harry, Willowson, Kathy, Bailey, Dale. (1401). 'Partial volume effect in SPECT & PET imaging and impact on radionuclide dosimetry estimates', , 11(1), pp. 44-54. doi: 10.22038/aojnmb.2022.63827.1448
Marquis, Harry, Willowson, Kathy, Bailey, Dale. Partial volume effect in SPECT & PET imaging and impact on radionuclide dosimetry estimates. , 1401; 11(1): 44-54. doi: 10.22038/aojnmb.2022.63827.1448

Partial volume effect in SPECT & PET imaging and impact on radionuclide dosimetry estimates

Asia Oceania Journal of Nuclear Medicine and Biology
مقاله 7، دوره 11، شماره 1، فروردین 2023، صفحه 44-54    اصل مقاله (1.35 M)
نوع مقاله: Original Article
شناسه دیجیتال (DOI): 10.22038/aojnmb.2022.63827.1448
نویسندگان
Harry Marquis1؛ Kathy P Willowson2، 3؛ Dale L Bailey* 1، 3
1Sydney Vital Translational Cancer Research Centre, Sydney, Australia
2Institute of Medical Physics, University of Sydney, Sydney, Australia
3Department of Nuclear Medicine, Royal North Shore Hospital, Sydney, Australia
چکیده
Objective(s): The spatial resolution of emission tomographic imaging systems can lead to a significant underestimation in the apparent radioactivity concentration in objects of size comparable to the resolution volume of the system. The aim of this study was to investigate the impact of the partial volume effect (PVE) on clinical imaging in PET and SPECT with current state-of-the-art instrumentation and the implications that this has for radionuclide dosimetry estimates.
Methods: Using the IEC Image Quality Phantom we have measured the underestimation in observed uptake in objects of various sizes for both PET and SPECT imaging conditions. Both single pixel measures (i.e., SUVmax) and region of interest mean values were examined over a range of object sizes. We have further examined the impact of the PVE on dosimetry estimates in OLINDA in 177Lu SPECT imaging based on a subject with multiple somatostatin receptor positive paragangliomas in the head and neck.
Results: In PET, single pixel estimates of uptake are affected for objects less than approximately 18 mm in minor axis with existing systems. In SPECT imaging with medium energy collimators (e.g., for 177Lu imaging), however, the underestimates are far greater, where single pixel estimates in objects less than 2-3×the resolution volume are significantly impacted. In SPECT, region of interest mean values are underestimated in objects less than 10 cm in diameter. In the clinical case example, the dosimetry measured with SPECT ranged from more than 60% underestimate in the largest lesion (28×22 mm in maximal cross-section; 10.2 cc volume) to >99% underestimate in the smallest lesion (4×5 mm; 0.06 cc).
Conclusion: The partial volume effect remains a significant factor when estimating radionuclide uptake in vivo, especially in small volumes. Accurate estimates of absorbed dose from radionuclide therapy will be particularly challenging until robust solutions to correct for the PVE are found.
کلیدواژه‌ها
PET؛ SPECT؛ Partial Volume Effect؛ Radionuclide Dosimetry
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