Transmission study of the Abdominal Compression plate (BodyFIX Diaphragm Control) for abdominal and stereotactic body radiotherapy

Vaithianathan, Hema; Harris, Benjamin

doi:10.1002/acm2.13373

Cited by 2 publications

(1 citation statement)

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“…Baseplate devices are made from carbon fiber and polymethyl methacrylate. They attenuate the radiation dose and increase the skin dose depending on their material and thickness [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Setup accuracy and dose attenuation of a wooden immobilization system for lung stereotactic body radiotherapy

Nitta

Ueda²,

Murata³

et al. 2022

Rep Pract Oncol Radiother.

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cancer [1][2][3][4][5][6]. The requirements for SBRT are generally a few treatment fractions with a high-dose in each treatment. The high-dose area is confined to the target, and it shrinks rapidly outside the target AbstrAct background: We evaluated the setup error and dose absorption of an immobilization system with a shell and wooden baseplate (sW) for lung stereotactic body radiotherapy (sBrT).Materials and methods: setup errors in 109 patients immobilized with an sW or BodyFix system (BF) were compared. Dose attenuation rates of materials for baseplates were measured with an ion-chamber. Ionization measurements were performed from 90° to 180° gantry angle in 10° increments, with the ball water equivalent phantom placed at the center of the wood and carbon baseplates whose effects on dose distribution were compared using an electron portal imaging device. results:The ratio for the anterior-posterior, cranial-caudal, and right-left of the cases within 3-mm registered shifts in interfractional setup error were 90.9%, 89.2%, and 97.4% for the sW, and 93.2%, 91.6%, and 98.0% for the BF, respectively. For intrafractional setup error, 98.3%, 97.4%, and 99.1% for the sW and 96.6%, 95.8%, and 98.7% for the BF were within 3-mm registered shifts, respectively. In the center position, the average (minimum/maximum) dose attenuation rates from 90° to 180° for the wooden and carbon baseplates were 0.5 (0.1/2.8)% and 1.0 (-0.1/10.1)% with 6 MV, respectively. The gamma passing rates of 2%/2 mm for the wooden and carbon baseplates were 99.7% and 98.3% (p < 0.01). conclusions: The immobilization system with an sW is effective for lung sBrT since it is comparable to the BF in setup accuracy. Moreover, the wooden baseplate had lower radiation attenuation rates and affected the dose distribution less than the carbon baseplate.

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Section: Introductionmentioning

confidence: 99%