Fabrication and development of a thorax phantom to evaluate 3D CRT treatment planning techniques for post‑mastectomy chest wall radiotherapy

*, Srinivas Challapalli and Banerjee, Sourjya and Saxena, Prakash P U and *, R Shreyas and *, Ravichandran Ramamoorthy and *, Putha Suman Kumar and Lobo, Dilson (2021) Fabrication and development of a thorax phantom to evaluate 3D CRT treatment planning techniques for post‑mastectomy chest wall radiotherapy. Physical and Engineering Sciences in Medicine, 44 (6). pp. 425-432. ISSN 26624729

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Abstract

The aim of this study was to design and fabricate a thorax phantom to quantify the radiation doses to the region of the chest wall (with 3 ionization chambers), the organ at risk (OAR) (lung), and the surface using radiochromic flms (EBT3) for three diferent 3D CRT treatment planning techniques. Anthropomorphic phantoms are one of the best tools for verifying the quality of the radiotherapy treatment plans generated by treatment planning systems since they can provide equivalent human tissue densities. Thirty acrylic plates were cut into ellipses 21 cm in height and 31 cm in width, and slots were created to insert lung equivalent cork material and bone equivalent Tefon material. Three treatment planning techniques were designed: (A) tangential pair beams, (B) tangential pair beams with wedges and (C) tangential beams followed by an anterior oblique beam. The percentage diference between the measured point doses and the calculated doses (measured with three CC13 ionization chambers) ranged from −3.2 to 1.6%, with a mean deviation of −1.04±1.3%. The measured mean percentage doses on the target surface with EBT3 flm were 90.3% and 95.1% of the prescribed dose with 5-mm and 10-mm boluses, respectively. Finally, the average absolute dose diference between the measured and calculated surface doses was within 10 cGy in all three planning techniques. The developed thorax phantom is suitable for point dose measurements using ionization chambers and for surface dose measurements using EBT3 Gafchromic flms in post-mastectomy chest wall radiotherapy.

Item Type: Article
Uncontrolled Keywords: Thorax · 3D CRT · Quality assurance · Phantom · Chest wall radiotherapy
Subjects: Medicine > KMC Mangalore > Radiotherapy and Oncology
Depositing User: KMCMLR User
Date Deposited: 17 Dec 2021 11:06
Last Modified: 17 Dec 2021 11:06
URI: http://eprints.manipal.edu/id/eprint/157659

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