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Comparison of (90)Y SIRT predicted and delivered absorbed doses using a PSF conversion method

PURPOSE: The aims of this study were to develop and apply a method to correct for the differences in partial volume effects of pre-therapy Technetium-99 m ((99m)Tc)-MAA SPECT and post-therapy Yttrium-90 ((90)Y) bremsstrahlung SPECT imaging in selective internal radiation therapy, and to use this met...

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Autores principales: Craig, Allison J., Murray, Iain, Denis-Bacelar, Ana M., Rojas, Bruno, Gear, Jonathan I., Hossen, Lucy, Maenhout, Annelies, Khan, Nasir, Flux, Glenn D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Istituti Editoriali e Poligrafici Internazionali 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8501309/
https://www.ncbi.nlm.nih.gov/pubmed/34339928
http://dx.doi.org/10.1016/j.ejmp.2021.07.026
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author Craig, Allison J.
Murray, Iain
Denis-Bacelar, Ana M.
Rojas, Bruno
Gear, Jonathan I.
Hossen, Lucy
Maenhout, Annelies
Khan, Nasir
Flux, Glenn D.
author_facet Craig, Allison J.
Murray, Iain
Denis-Bacelar, Ana M.
Rojas, Bruno
Gear, Jonathan I.
Hossen, Lucy
Maenhout, Annelies
Khan, Nasir
Flux, Glenn D.
author_sort Craig, Allison J.
collection PubMed
description PURPOSE: The aims of this study were to develop and apply a method to correct for the differences in partial volume effects of pre-therapy Technetium-99 m ((99m)Tc)-MAA SPECT and post-therapy Yttrium-90 ((90)Y) bremsstrahlung SPECT imaging in selective internal radiation therapy, and to use this method to improve quantitative comparison of predicted and delivered (90)Y absorbed doses. METHODS: The spatial resolution of (99m)Tc SPECT data was converted to that of (90)Y SPECT data using a function calculated from (99m)Tc and (90)Y point spread functions. This resolution conversion method (RCM) was first applied to (99m)Tc and (90)Y SPECT phantom data to validate the method, and then to clinical data to assess the power of (99m)Tc SPECT imaging to predict the therapeutic absorbed dose. RESULTS: The maximum difference between absorbed doses to phantom spheres was 178%. This was reduced to 27% after the RCM was applied. The clinical data demonstrated differences within 38% for mean absorbed doses delivered to the normal liver, which were reduced to 20% after application of the RCM. Analysis of clinical data showed that therapeutic absorbed doses delivered to tumours greater than 100 cm(3) were predicted to within 52%, although there were differences of up to 210% for smaller tumours, even after the RCM was applied. CONCLUSIONS: The RCM was successfully verified using phantom data. Analysis of the clinical data established that the (99m)Tc pre-therapy imaging was predictive of the (90)Y absorbed dose to the normal liver to within 20%, but had poor predictability for tumours smaller than 100 cm(3).
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spelling pubmed-85013092021-10-14 Comparison of (90)Y SIRT predicted and delivered absorbed doses using a PSF conversion method Craig, Allison J. Murray, Iain Denis-Bacelar, Ana M. Rojas, Bruno Gear, Jonathan I. Hossen, Lucy Maenhout, Annelies Khan, Nasir Flux, Glenn D. Phys Med Article PURPOSE: The aims of this study were to develop and apply a method to correct for the differences in partial volume effects of pre-therapy Technetium-99 m ((99m)Tc)-MAA SPECT and post-therapy Yttrium-90 ((90)Y) bremsstrahlung SPECT imaging in selective internal radiation therapy, and to use this method to improve quantitative comparison of predicted and delivered (90)Y absorbed doses. METHODS: The spatial resolution of (99m)Tc SPECT data was converted to that of (90)Y SPECT data using a function calculated from (99m)Tc and (90)Y point spread functions. This resolution conversion method (RCM) was first applied to (99m)Tc and (90)Y SPECT phantom data to validate the method, and then to clinical data to assess the power of (99m)Tc SPECT imaging to predict the therapeutic absorbed dose. RESULTS: The maximum difference between absorbed doses to phantom spheres was 178%. This was reduced to 27% after the RCM was applied. The clinical data demonstrated differences within 38% for mean absorbed doses delivered to the normal liver, which were reduced to 20% after application of the RCM. Analysis of clinical data showed that therapeutic absorbed doses delivered to tumours greater than 100 cm(3) were predicted to within 52%, although there were differences of up to 210% for smaller tumours, even after the RCM was applied. CONCLUSIONS: The RCM was successfully verified using phantom data. Analysis of the clinical data established that the (99m)Tc pre-therapy imaging was predictive of the (90)Y absorbed dose to the normal liver to within 20%, but had poor predictability for tumours smaller than 100 cm(3). Istituti Editoriali e Poligrafici Internazionali 2021-09 /pmc/articles/PMC8501309/ /pubmed/34339928 http://dx.doi.org/10.1016/j.ejmp.2021.07.026 Text en © 2021 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Craig, Allison J.
Murray, Iain
Denis-Bacelar, Ana M.
Rojas, Bruno
Gear, Jonathan I.
Hossen, Lucy
Maenhout, Annelies
Khan, Nasir
Flux, Glenn D.
Comparison of (90)Y SIRT predicted and delivered absorbed doses using a PSF conversion method
title Comparison of (90)Y SIRT predicted and delivered absorbed doses using a PSF conversion method
title_full Comparison of (90)Y SIRT predicted and delivered absorbed doses using a PSF conversion method
title_fullStr Comparison of (90)Y SIRT predicted and delivered absorbed doses using a PSF conversion method
title_full_unstemmed Comparison of (90)Y SIRT predicted and delivered absorbed doses using a PSF conversion method
title_short Comparison of (90)Y SIRT predicted and delivered absorbed doses using a PSF conversion method
title_sort comparison of (90)y sirt predicted and delivered absorbed doses using a psf conversion method
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8501309/
https://www.ncbi.nlm.nih.gov/pubmed/34339928
http://dx.doi.org/10.1016/j.ejmp.2021.07.026
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