Design and Development of an Anthropomorphic Heterogeneous Female Pelvic (AHFP) Phantom for Dosimetric Verification of Advance Radiotherapy

Document Type : Original Paper

Authors

1 Department of Applied Physics, Amity School of Engineering & Technology, Amity University Madhya Pradesh, Maharajpura Dang, Gwalior, India

2 Department of Radiation Oncology, Dr. Ram Manohar Lohia Institute of Medical Sciences, Vibhuti Khand Gomti Nagar, Lucknow -226010

3 14-00079

4 Dept. of Physics, Tilak Dhari P. G. College, Jaunpur, (U.P.) - 222002, INDIA, V.B.S. Purvanchal University, Jaunpur, (U.P.) - 222003, INDIA and Dept. of Radiation Oncology, U.P.U.M.S., Saifai, Etawah (U.P.) - 206130, INDIA

Abstract

Introduction: The objective of this work is to design a new kind of AHFP phantom to determine if this phantom is a realistic representation of actual cervical cancer patients. This can serve as a stand-in for the dosimetry quality assurance of a real patient.
Material and Methods: An anthropomorphic heterogeneous female pelvic phantom was designed which was made of paraffin wax, a female pelvic bone, water, gauze, polyvinyl chloride (PVC) and polymerized siloxanes. The AHFP phantom was scanned using a CT scanner (Toshiba Alexion 16 multi–Slice CT scanner) at 120kVp and 250mAs with a slice thickness of 2mm to assess how accurately the resulting phantom product simulates a real patient. The CT images were transferred to the Eclipse treatment planning system for dosimetry analysis.
Results: The AHFP phantom's CT numbers and relative electron densities of the uterus, bladder, rectum, muscles, fat, bones, and cavities were found close to real patients. The mean percentage variations between planned and measured doses of all RapidArc QA plans were of 2.14 % and standard deviation of 0.543 (t=0.135, p= 0.447; p>0.05) for homogeneous phantom¸ and 7.57% & standard deviation 2.358 (t=4.674, p=0.00094; p< .05) for AHFP phantom.
Conclusion: It is concluded that the existing algorithms in TPS for dosimetry are working fine for homogeneous phantoms, but it does not work good for heterogeneous (AHFP) phantom. Therefore, patient-specific absolute dosimetry should be performed using a heterogeneous phantom that closely resembles the actual human body in terms of both density and design.

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Iranian Journal of Medical Physics
Volume 21, Issue 1 - Serial Number 1
January and February 2024
Pages 64-70

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History

  • Receive Date: 12 October 2022
  • Revise Date: 04 January 2023
  • Accept Date: 22 January 2023

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