Suitability Assessment of an Indigenous Heterogeneous Thoracic Phantom for Patient-Specific Quality Assurance in Radiotherapy

Document Type : Original Paper

Authors

1 Department of Physics Bareilly College Bareilly, Uttar Pradesh Medical Physics Division & Radiation Oncology Department, Apollo Medics Hospital, Lucknow

2 Department of Physics Bareilly College Bareilly, Uttar Pradesh

3 Government Cancer Hospital, Mahatma Gandhi Memorial Medical College, Indore

4 Department of Medical Physics, Rajiv Gandhi Cancer Institute and Research Center, New Delhi

5 Medical Physics Division & Radiation Oncology Department, Apollo Medics Hospital, Lucknow

6 Department of Radiation Oncology, Dr. Ram Manohar Lohia Institute of Medical sciences, Lucknow, India

Abstract

Introduction: Patient-specific quality assurance (PSQA) assumes a vital role in precise and accurate radiation delivery to cancer patients. Since the patient body comprises heterogeneous media, the present study aimed to fabricate a heterogeneous thoracic phantom for PSQA.
Material and Methods: Heterogeneous thoracic (HT) phantom was fabricated using rib cage madeup of bone equivalent material, kailwood to mimic lungs and wax to mimic various body parts. Physical density of all these materials used in phantom fabrication was measured and compared with that of the corresponding part of actual human thorax. One beam was planned on the computed tomography (CT) images of phantom and actual patient thorax region. Dose distribution in both the plans was measured and analyzed.
Results:The estimated densities of heart, lung, ribs, scapula, spine, and chest wall tissues were 0.804±0.007, 0.186±0.010, 1.796±0.061, 2.017±0.026, 2.106±0.029 and 0.739±0.028 respectively in case of HT phantom while 1.038±0.010, 0.199±0.031, 1.715±0.040, 2.006±0.019, 1.929±0.065 and 0.816±0.028 g/cc, respectively in case of actual human thorax region.The depths of isodose curves in HT phantom were also comparable to the isodose curve’s depths inreal patient. PSQA results were within ±3% for flat beam (FB) and flattening filtered free beam (FFFB) of 6 megavolts (MV) energy.
Conclusion: Density and dose distribution pattern in HT phantom were similar to that in actual human thorax region. Thus, fabricated HT phantom can be utilized for radiation dosimetry in thoracic cancer patients. The materials used to develop HT phantom are easily available in market at an affordable price and easy to craft.

Keywords

Main Subjects

References

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Iranian Journal of Medical Physics
Volume 19, Issue 2
March and April 2022
Pages 85-90

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History

  • Receive Date: 28 September 2020
  • Revise Date: 15 May 2021
  • Accept Date: 29 June 2021

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