Journal of Modern Research Physics
Volume 8, Issue 2 (Autumn and Winter 2023 2024)
JMRPh 2024, 8(2): 24-33 |
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Sadat S A, Banaee N, Esmaili Sani V. Design and fabrication of heterogeneous phantom for commissioning radiotherapy treatment planning systems. JMRPh 2024; 8 (2) :24-33
URL: http://jmrph.khu.ac.ir/article-1-221-en.html
URL: http://jmrph.khu.ac.ir/article-1-221-en.html
Department of Medical Radiation, Engineering Faculty, Central Tehran Branch, Islamic Azad University, Tehran, Iran
Abstract: (97 Views)
Background and Aim: Treatment planning systems (TPSs) should be prepared to identify various tissues of body. This process requires a CT-ED curve as an input to TPS. In this process, a phantom with various inhomogeneities is scanned with CT and then the CT numbers of corresponding materials of the phantom are obtained. By knowing the electron density of these materials, The CT-ED curve can be entered into the TPS and the system can identify the material of different tissues and perform dose calculations based on the tissue type using this curve. The purpose of this study is to design and fabricate a phantom with 6 different inhomogeneities to be used in the process of commissioning TPSs.
Material and Methods: The electron density phantom with code M062 made by CIRS company of America was chosen as the reference phantom. The body of the new phantom was designed using Solidworks software. A cylindrical phantom with height of 15cm and diameter of 20cm was designed by considering various inhomogeneities. The CT images were obtained from two phantoms under same conditions. After determining the CT numbers and the electron densities of the materials, the CT-ED curves were obtained and compared with each other using Excel software.
Results: The results obtained from both phantoms were close to each other and subsequently the CT-ED curves of both phantoms had the same structure with great similarity to each other.
Conclusion: The fabricated phantom is equivalent to the reference phantom and has all three main parts: lung, soft tissue and bone and can be used in radiotherapy centers instead of the reference phantom for commissioning TPSs.
Keywords: Phantom, Electron density, Treatment Planning System, Radiotherapy.
Material and Methods: The electron density phantom with code M062 made by CIRS company of America was chosen as the reference phantom. The body of the new phantom was designed using Solidworks software. A cylindrical phantom with height of 15cm and diameter of 20cm was designed by considering various inhomogeneities. The CT images were obtained from two phantoms under same conditions. After determining the CT numbers and the electron densities of the materials, the CT-ED curves were obtained and compared with each other using Excel software.
Results: The results obtained from both phantoms were close to each other and subsequently the CT-ED curves of both phantoms had the same structure with great similarity to each other.
Conclusion: The fabricated phantom is equivalent to the reference phantom and has all three main parts: lung, soft tissue and bone and can be used in radiotherapy centers instead of the reference phantom for commissioning TPSs.
Keywords: Phantom, Electron density, Treatment Planning System, Radiotherapy.
Type of Study: Research |
Subject:
Special
Received: 2023/06/8 | Accepted: 2024/12/3 | Published: 2024/02/29
Received: 2023/06/8 | Accepted: 2024/12/3 | Published: 2024/02/29
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