Three-dimensional patient-specific dosimetry in radioimmunotherapy with

Marco D'Arienzo, Francesco Cicone, Laura Chiacchiararelli, Angela Coniglio, Angelika Bischof Delaloye, Francesco Scopinaro

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Abstract

Aim of the present article was to perform three-dimensional (3D) single photon emission tomography-based dosimetry in radioimmunotherapy (RIT) with90Y-ibritumomab-tiuxetan. A custom MATLAB-based code was used to elaborate 3D images and to compare average 3D doses to lesions and to organs at risk (OARs) with those obtained with planar (2D) dosimetry. Our 3D dosimetry procedure was validated through preliminary phantom studies using a body phantom consisting of a lung insert and six spheres with various sizes. In phantom study, the accuracy of dose determination of our imaging protocol decreased when the object volume decreased below 5 mL, approximately. The poorest results were obtained for the 2.58 mL and 1.30 mL spheres where the dose error evaluated on corrected images with regard to the theoretical dose value was-12.97% and-18.69%, respectively. Our 3D dosimetry protocol was subsequently applied on four patients before RIT with90Y-ibritumomab-tiuxetan for a total of 5 lesions and 4 OARs (2 livers, 2 spleens). In patient study, without the implementation of volume recovery technique, tumor absorbed doses calculated with the voxel-based approach were systematically lower than those calculated with the planar protocol, with average underestimation of-39% (range from-13.1% to-62.7%). After volume recovery, dose differences reduce significantly, with average deviation of-14.2% (range from-38.7.4% to +3.4%, 1 overestimation, 4 underestimations). Organ dosimetry in one case overestimated, in the other underestimated the dose delivered to liver and spleen. However, both for 2D and 3D approach, absorbed doses to organs per unit administered activity are comparable with most recent literature findings. © 2012, Mary Ann Liebert, Inc.
Original languageEnglish
Pages (from-to)124 - 133
Number of pages10
JournalCancer Biotherapy and Radiopharmaceuticals
Volume27
Issue number2
DOIs
Publication statusPublished - 1 Mar 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Pharmacology
  • Cancer Research

Cite this

D'Arienzo, M., Cicone, F., Chiacchiararelli, L., Coniglio, A., Delaloye, A. B., & Scopinaro, F. (2012). Three-dimensional patient-specific dosimetry in radioimmunotherapy with. Cancer Biotherapy and Radiopharmaceuticals, 27(2), 124 - 133. https://doi.org/10.1089/cbr.2011.1063