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Abstract

The difference between the true treatment image represented by the portal image and a picture digitally reconstructed radiograph (DRR) coming from the physics planning as the reference image helps us measure displacement. The treatment area is dependent on the edges of the setting error. The essential step is to estimate the setting error during treatment. Dosage allocation at PTV (planning treatment volume) follows on set-up edges. Set up errors for the radiation oncology collective to minimize the therapy error. Position errors explain the variance between the first position the patient was scanned at the Computer Tomography (CT) simulation and the set-up position in the therapy couch. The most commonly evaluated errors in radiotherapy are random errors and systematic errors. Tumors of breast cancer and the uterus are the most common conditions in women. We use the EPID (electronic portal imaging device) to measure the photon intensity a patient transmits from an irradiation port through a therapy fraction. This research aims to define a systematic random error for patients with breast (right and left) cancer (N = 15) and uterus cancer (N = 9). The systematic error for a breast patients was (0.02, 0.04, 0.06 cm) on the (x, y, z) axes, whereas for uterus patients, it was (0.07, 0.09, 0.03 cm). The breast cases had a random error of (0.02, 0.08, 0.01 cm) on the (x, y, z) axes, respectively, while the uterus cases had a random error of (0.02, 0.18, 0.04 cm). Radiation therapy uses a linear accelerator (Elekta).

Keywords

Breast cancer, Electronic portal image device (EPID), LINAC, Radiation therapy, Uterus cancer

Subject Area

Physics

Article Type

Article

First Page

932

Last Page

942

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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