Quantitative Analysis of 90Y Bremsstrahlung SPECT-CT Images for Application to 3D Patient-Specific Dosimetry
- 1 February 2009
- journal article
- research article
- Published by Mary Ann Liebert Inc in Cancer Biotherapy & Radiopharmaceuticals
- Vol. 24 (1), 145-154
- https://doi.org/10.1089/cbr.2008.0543
Abstract
Aim: The aim of this study was to evaluate the accuracy of the activity quantification of single-photon emission computed tomography/computed tomography (SPECT-CT) 90Y-Bremsstrahlung images and to validate the S-voxel method. Methods: An anthropomorphic torso phantom with radioactive inserts (90Y) was acquired by SPECT-CT. Constant calibration factors (cps/MBq) for the quantification were evaluated, considering different volume, shape, position inside the phantom, activity concentration and background, and distance from detectors. S-voxel values (EGSnrc) were implemented in MATLAB R0086 USA software. Dose comparisons between S-voxel and the conventional Medical Internal Radiation Dose method were repeated in a group of 11 patients administered with 90Y-DOTATATE. Results: Using the appropriate calibration factors to recover the volume variability, the error about the measurement repeatability and the activity variation was within 4%. The variability of activity quantification, depending on the position in the phantom, detector distance, and background, was Conclusions: The results confirm that, with the hybrid SPECT-CT system, quantitative analysis of SPECT 90Y-Bremsstrahlung images and the generation of three-dmensional dose distributions are feasible. The improved analysis of Bremsstrahlung images could have a notable clinical impact, allowing to address the dosimetric verification to patients during the course of therapy.Keywords
This publication has 6 references indexed in Scilit:
- Biological optimization of heterogeneous dose distributions in systemic radiotherapyMedical Physics, 2006
- OEDIPE: A Personalized Dosimetric Tool Associating Voxel-Based Models with MCNPXCancer Biotherapy & Radiopharmaceuticals, 2005
- Estimation of Patient Dose from Radiopharmaceuticals Using Voxel ModelsCancer Biotherapy & Radiopharmaceuticals, 2005
- A Software Tool for Specifying Voxel Models for Dosimetry EstimationCancer Biotherapy & Radiopharmaceuticals, 2003
- 3D Absorbed Dose Calculations Based on SPECT: Evaluation for 111-In/90-Y Therapy using Monte Carlo SimulationsCancer Biotherapy & Radiopharmaceuticals, 2003
- Quantitation in PET using isotopes emitting prompt single gammas: application to yttrium-86European Journal of Nuclear Medicine and Molecular Imaging, 2002