Development and application of a set of mesh-based and age-dependent Chinese family phantoms for radiation protection dosimetry: Preliminary Data for external photon beams

Yifei Pi,Wanli Huo,Mang Feng,X George Xu,Lian Zhang,Zhi Chen,F Malvagi,C.M’B Diop,F Malouch,J Miss,J.C Trama

doi:10.1051/epjconf/201715304014

Abstract

A group of mesh-based and age-dependent family phantoms for Chinese populations were developed in this study. We implemented a method for deforming original RPI-AM and RPI-AF models into phantoms of different ages: 5, 10 ,15 and adult. More than 120 organs for each model were processed to match with the values of the Chinese reference parameters within 0.5%. All of these phantoms were then converted to voxel format for Monte Carlo simulations. Dose coefficients for adult models were counted to compare with those of RPI-AM and RPI-AF. The results show that there are significant differences between absorbed doses of RPI phantoms and these of our adult phantoms at low energies. Comparisons for the dose coefficients among different ages and genders were also made. it was found that teenagers receive more radiation doses than adults under the same irradiation condition. This set of phantoms can be utilized to estimate dosimetry for Chinese population for radiation protection, medical imaging, and radiotherapy.

Highlights

A main and indispensable task in radiation protection, medical imaging, and radiotherapy is to estimate organ doses
Comparisons for the dose coefficients among different ages and genders were made. it was found that teenagers receive more radiation doses than adults under the same irradiation condition
Variability in shape and mess define introduced by motion of human body can be a significant factor affecting organ dose

Summary

Introduction

A main and indispensable task in radiation protection, medical imaging, and radiotherapy is to estimate organ doses. Computational phantoms, especially whole body computational phantom for estimations of dosimetry have become widely used [1,2]. Such phantoms are typically based on reference anatomical values, for the population of interests. Voxel phantoms utilize huge building blocks and mix them together. Each block has their own density data and material information based on medical images such as CT or MRI. Variability in shape and mess define introduced by motion of human body can be a significant factor affecting organ dose. BREP phantoms, in the form of either Non-Uniform Rational BSpline (NURBS) or polygonal meshes, possess attractive features in flexibility and anatomical realism [3,4,5]

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Conclusion