Title:An In-House 3D Voxel Dosimetric Tool to Compare Predictive and Post-
Treatment Dosimetry in 90Y Radioembolization: A Proof of Concept
Volume: 16
Issue: 3
Author(s): Ornella Ferrando*, Rossana Bampi, Franca Foppiano and Andrea Ciarmiello
Affiliation:
- Department of Physics, Sant’Andrea Hospital, ASL5 Spezzino, La Spezia, Italy
Keywords:
90Y, radioembolization, voxel dosimetry, spect/ct, pet/ct, 99mTc-MAA.
Abstract:
Aim: The aim of this study was to implement an in-house dosimetric tool to assess tumour-
absorbed doses in pre and post-dosimetry for 90Y radioembolization with resin spheres.
Materials and Methods: To perform dosimetric calculations we set up a dosimetric procedure and
developed homemade software to calculate tumour absorbed dose and dose volume histograms
(DVHs). The method is based on a simplified voxel dosimetry for an estimated 3D absorbed dose
and it can be applied to both 99mTc-MAA SPECT/CT and 90Y PET/CT acquisitions for pre and
post-dosimetry. We tested the software performance in a retrospective study using the data of 22
patients with hepatocellular carcinoma who underwent radioembolization with 90Y resin spheres in
the period 2016-2021. The software calculates tumour doses (mean, minimum and maximum doses)
from voxel counts and dose-volume histograms (DVH_spect, DVH_pet) for both 99mTc-MAA
SPECT/CT and 90Y PET/CT imaging. DVH_spect and DVH_pet data were analyzed and compared
with the aim to assess an agreement between them. Concordance between dosimetric data
were evaluated with the Wilcoxon Signed Ranked test, descriptive statistical analysis and Pearson
correlation coefficient.
Results: The mean administrated activity was 1313 MBq (range 444 MBq - 2200 MBq). Tumour
volumes ranged from 75 mL to 1012 mL. The mean absorbed dose for tumour volume was 161 ±
66 Gy (Dm_spect) and 173 ± 79 Gy (Dm_pet). From Wilcoxon Signed Rank Test the differences between
the dosimetric data extrapolated from DVH_spect and DVH_pet results were not significant
with α = 0.05 (two-sided test). A good linear correlation was found between 99mTc-MAA and 90Y
dosimetric data (Pearson correlation coefficient 0.887 p < 0.001). Generally, DVHs calculated on
99mTc-MAA SPECT/CT and 90Y PET/CT gave comparable results, some discrepancies were observed
particularly with those patients where SPECT and PET imaging presented a visual mismatching.
Conclusion: A simplified 3D dosimetry methodology was implemented and tested retrospectively
on patient data treated with 90Y resin spheres. Even if the clinical feasibility of our approach has to
be further validated on an extended patient cohort, the preliminary results of our study highlight
the potential of the implemented dosimetric tool for tumour dose assessment.