Accuracy of Two Dosimetry Software Programs for 177Lu Radiopharmaceutical Therapy Using Voxel-Based Patient-Specific Phantoms
| Autor: | Keamogetswe Ramonaheng, Hanlie du Raan, Johan A. van Staden |
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| Rok vydání: | 2021 |
| Předmět: |
History
Polymers and Plastics business.industry Monte Carlo method Gold standard (test) Patient specific computer.software_genre Industrial and Manufacturing Engineering Software Voxel Absorbed dose Reference values Dosimetry Business and International Management Nuclear medicine business computer Mathematics |
| Zdroj: | SSRN Electronic Journal. |
| ISSN: | 1556-5068 |
| DOI: | 10.2139/ssrn.3958626 |
| Popis: | PurposeVirtual dosimetry using voxel-based patient-specific phantoms and Monte Carlo (MC) simulations offer the advantage of having a gold standard against which absorbed doses may be benchmarked to establish the dosimetry accuracy. Furthermore, these reference values assist in investigating the accuracy of the absorbed dose methodologies from different software programs. Therefore, this study aimed to compare the accuracy of the absorbed doses computed using LundADose and OLINDA/EXM 1.0.MethodsThe accuracy was based on 177Lu-DOTATATE distributions of three voxel-based phantoms. SPECT projection images were simulated for 1, 24, 96, and 168 hours post-administration and reconstructed with LundADose using 3D OS-EM reconstruction. Mono-exponential curves were fitted to the bio-kinetic data for the kidneys, liver, spleen, and tumours resulting in SPECT time-integrated activity (SPECT-TIA). The SPECT-TIA were used to compute mean absorbed doses using LundADose (LND-D SPECT ) and OLINDA (OLINDA-D SPECT ) for the organs. Pre-defined true activity images, were used to obtain TRUE-TIA and, together with full MC simulations, computed the true doses (MC-D True ). The dosimetry accuracy was assessed by comparing LND-D SPECT and OLINDA-D SPECT to MC-D True .ResultsOverall, the results presented an overestimation of the mean absorbed dose by LND-D SPECT compared to the MC-D True with a dosimetry accuracy ≤ 6.59%. This was attributed to spill-out activity from the reconstructed LND-D SPECT , resulting in a higher dose contribution than the MC-D True . There was a general underestimation (< 8.11%) of OLINDA-D SPECT compared to MC-D True attributed to the geometrical difference in shape between the voxel-based phantoms and the OLINDA models. Furthermore, OLINDA-D SPECT considers self-doses while MC-D True reflects self-doses plus cross-doses.ConclusionThe better than 10% accuracy suggests that the mean dose values obtained with LND-D SPECT and OLINDA-D SPECT approximate the true values. The mean absorbed doses of the two software programs, and the gold standard were comparable. This work shall be of use for optimising 177Lu dosimetry for clinical applications. |
| Databáze: | OpenAIRE |
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