The Correlation of Total MU Number and Percentage Dosimetric Error in Step and Shoot IMRT with Gamma Passing Rate Using OCTAVIUS 4D-1500 Detector Phantom

Abdulbaqi, Abdulrahman Mohammed; Abdullah, Siham Sabah; HamzaAlabed, Haydar; Alazawy, Nabaa M.; JabbarAl-Musawi, Mustafa; Heydar, Ahmed Faris

doi:10.36295/asro.2020.232126

Cited by 4 publications

(2 citation statements)

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“…Radiation therapy is a standard treatment for cancer that involves delivering high-energy radiation to the tumor to kill cancer cells. Accurate patient positioning before each fraction is crucial in radiotherapy treatment to ensure that the maximum dose reaches the planning target volume (PTV) while minimizing radiation exposure to organs at risk (OAR), which is the primary goal of radiotherapy [ 1 - 4 ]. The critical organs close to the head and neck tumors, such as optic nerves, brain stem, and cochlea, often necessitate stringent PTV margins [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…The clinical target volume (CTV) is multiplied by a margin to account for PTV imperfections in patient positioning, beam alignment, and organ movements (i.e., setup margin and internal margin). Setup margins are important to avoid irradiating OARs inadvertently and have a significant impact on the total dose delivered to the target [ 4 , 6 ]. Two kinds of errors occur in radiotherapy treatment positioning: systematic error and random error.…”

Section: Introductionmentioning

confidence: 99%

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Assessing setup errors and shifting margins for planning target volume in head, neck, and breast cancer

Alabedi

2023

JMedLife

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Accurately calculating setup errors is crucial in ensuring quality assurance for patients undergoing radiation therapy treatment. This cross-sectional study aimed to determine the systematic, random, and planning target volume (PTV) margin errors for patients with head and neck cancer (n=48) and breast cancer (n=50). The treatment setup was performed using electronic portal imaging (EPIDs) and irradiated using Elekta linac. The errors were calculated using the van Herk formula. The systematic error for the head and neck was 0.89, 0.43, and 1.49 mm on the x, y, and z-axis, respectively, and 0.39, 0.74, 0.38 for the breast cases. The random error was 0.82, 0.68, 0.94 mm for the head and neck and 0.66, 0.72, 0.79 mm for the breast. The PTV margin shifting error for the head and neck were 2.79, 1.55, and 4.38 mm, while it was 1.43, 2.35, and 1.50 mm for the breast. The setup errors varied according to the tumor location. The study highlights the potential benefits of using EPIDs for reducing uncertainties in setup verification procedures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%