Determination of an Effective Wedge Angle by Combination of Two Arbitrary Universal Wedge Fields in Radiation Therapy of Cancer Patients with Megavoltage Photon Beams

Shamsi, Azin; Birgani, Mohammad Javad Tahmasebi; Behrooz, Mohammad Ali; Arvandi, Sholeh; Fatahiasl, Jafar; Maskny, Reza; Abdalvand, Neda

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자료유형: 학술저널

저자정보: Shamsi, Azin (Department of Medical physics Faculty of medical sciences Ahwaz jondishapour university of medical sciences) Birgani, Mohammad Javad Tahmasebi (Department of Medical physics Faculty of medical sciences Ahwaz jondishapour university of medical sciences) Behrooz, Mohammad Ali (Department of Medical physics Faculty of medical sciences Ahwaz jondishapour university of medical sciences) Arvandi, Sholeh (Department of Medical physics Faculty of medical sciences Ahwaz jondishapour university of medical sciences) Fatahiasl, Jafar (Department of Medical physics Faculty of medical sciences Ahwaz jondishapour university of medical sciences) Maskny, Reza (Departments of Clinical Oncology, Golestan Hospital, Ahvaz Jundishapur University of Medical Sciences) Abdalvand, Neda (Department of Medical physics Faculty of medical sciences Ahwaz jondishapour university of medical sciences)

저널정보: 아시아태평양암예방학회 Asian Pacific journal of cancer prevention : APJCP Asian Pacific journal of cancer prevention : APJCP 제17권 제1호

발행연도: 2016.1

수록면: 197 - 200 (4page)

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Background: Wedge filters are commonly used in radiation oncology for eliminating hot spots and creating a uniform dose distribution in optimizing isodose curves in the target volume for clinical aspects. These are some limited standard physical wedges ($15^{\circ}$, $30^{\circ}$, $45^{\circ}$, $60^{\circ}$),or creating an arbitrary wedge angle, like motorized wedge or dynamic wedge,${\ldots}$ The new formulation is presented by the combination of wedge fields for determining an arbitrary effective wedge angles. The isodose curves also are derived for these wedges. Materials and Methods: we performed the dosimetry of Varian Clinac 2100C/D with Scanditronix Wellhofer water blue phantom, CU500E, OmniPro - Accept software and 0.13cc ionization chamber for 6Mv photon beam in depth of 10cm (reference depth) for universal physical wedges ($15^{\circ}$, $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$) and reference field $10.10cm^2$. By combining the isodose curve standard wedge fields with compatible weighting dose for each field, the effective isodose curve is calculated for any wedge angle. Results: The relation between a given effective wedge angle and the weighting of each combining wedge fields was derived. A good agreement was found between the measured and calculated wedge angles and the maximum deviation did not exceed $3^{\circ}$. The difference between the measured and calculated data decreased when the combined wedge angles were closer. The results are in agreement with the motorized single wedge appliance in the literature. Conclusions: This technique showed that the effective wedge angle that is obtained from this method is adequate for clinical applications and the motorized wedge formalism is a special case of this consideration.

#Universal physical wedge #profile #megavoltage photon beam #radiation therapy

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Shamsi, Azin

소속기관 Deprtment of Medical Physisc, School of Medicine, Ahavaz Jundishapur University of Medical sciences