Validation of motorized wedge effective isodose angle with a 2D array detector

Gamit, Jaimin Samabhai and Rao, Shreekripa and Nagesh, Jyothi and Nair, Sarath S and Shambhavi, C and D'souza, Rechal Nisha and Sharan, Krishna and Chandraguthi, Srinidhi Gururajarao (2020) Validation of motorized wedge effective isodose angle with a 2D array detector. Iranian Journal of Medical Physics, 17 (6). pp. 380-385. ISSN 2252-0309

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Introduction: Elekta Versa HD linear accelerator is equipped with a universal wedge filter which is a single large physical wedge driven by motors; in other words, motorized wedge. It provides a nominal wedge isodose angle of 60° for the field size of 30×40 sq. cm. Motorized wedge isodose distribution generated is a combination of open and wedged beam segments. With this background in mind, the present study aimed to validate the planned wedge effective isodose angle. Material and Methods: The current study validated the planned wedge effective isodose angle for 15°, 30°, 45°, and 60° with 6MV and 15MV for 10x10 sq. cm and 20x20 sq. cm field size. To this end, an analytical formula was applied against a 2D array detector using PTW MultiCheck software. Results: As illustrated by the obtained results, the calculated, measured, and planned wedge effective isodose angle in this work represented a maximum deviation from its pre-set angle (a nominal wedge angle) of 9° for a 6MV photon energy and 5° for 15MV for field sizes of 10×10 sq. cm and 20×20 sq. cm. Conclusion: In the present study, we validated the planned wedge effective isodose angle for field sizes of 10x10sq. cm and 20x20sq. cm for 6MV and 15MV photon energies using an analytical method and 2D array detector with a reasonable agreement.

Item Type: Article
Uncontrolled Keywords: X-rays; radiometry; particle accelerators; quality control; radiotherapy planning; Computer-assisted.
Subjects: Allied Health > MCOAHS Manipal > Radiotherapy and Oncology
Allied Health > MCOAHS Manipal > Nuclear Medicine
Allied Health > MCOAHS Manipal > Physiotherapy
Medicine > KMC Manipal > Radiotherapy and Oncology
Depositing User: KMC Library
Date Deposited: 13 Jul 2021 10:33
Last Modified: 13 Jul 2021 10:33

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