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

Yuya Nitta; Yoshihiro Ueda; Seiya Murata; Masaru Isono; Shingo Ohira; Akira Masaoka; Shoki Inui; Hayate Washio; Reimi Yoshinaka; Tomohiro Sagawa; Masayoshi Miyazaki; Teruki Teshima

doi:10.5603/RPOR.a2022.0089

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

Rep Pract Oncol Radiother. 2022 Oct 31;27(5):809-820. doi: 10.5603/RPOR.a2022.0089. eCollection 2022.

Authors

Yuya Nitta¹, Yoshihiro Ueda¹, Seiya Murata¹, Masaru Isono¹, Shingo Ohira¹, Akira Masaoka¹, Shoki Inui^{1

2}, Hayate Washio^{3

4}, Reimi Yoshinaka¹, Tomohiro Sagawa¹, Masayoshi Miyazaki¹, Teruki Teshima⁵

Affiliations

¹ Department of Radiation Oncology, Osaka International Cancer Institute, Osaka, Japan.
² Department of Medical Physics and Engineering, Osaka University Graduate School, Osaka, Japan.
³ Department of Radiology, Osaka International Cancer Institute, Osaka, Japan.
⁴ Graduate School of Health Sciences, Kumamoto University, Kumamoto, Japan.
⁵ Osaka Heavy Ion Therapy Center, Osaka, Japan.

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.

Keywords: lung SBRT; setup verification; wooden baseplate.