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http://dx.doi.org/10.7742/jksr.2022.16.7.857

Evaluation of Treatment Planning for Head Tilting in WBRT 3D-CRT by TomoDirect mode: a Phantom Study  

Dae-Gun, Kim (Department of Radiation Oncology, Soonchunhyang University Bucheon Hospital)
Sang-Hyun, Kim (Department of Radiological Science, Shinhan University)
Publication Information
Journal of the Korean Society of Radiology / v.16, no.7, 2022 , pp. 857-862 More about this Journal
Abstract
The purpose of this study was to evaluate a three-dimensional conformal radiotherapy (3D-CRT) treatment plan with regard to head tilting in whole-brain radiotherapy (WBRT) using TomoDirect (TD) mode in Tomotherapy. WBRT 3D-CRT by TD was compared for a total of five head tilt angles (-20°, -10°, 0°. +10° and +20°). The dose homogeneity index (HI) and prescription dose index (CI) were calculated to confirm the target coverage. The maximum and average doses for critical organs such as the lens, eyeball and parotid glands were calculated for different angles of head tilting. The HI and CI were closet to the result value of 1 at the head tilted angle +10° and +20°. At a head tilted angle of +10°, the dose to the lens and eyeballs decreased by about 74% and about 30%, when compared with the reference angle (0°), respectively. The results of this study suggest that a head angle of +10 with chin-up would save adequate target coverage and reduce exposure dose to the lens.
Keywords
Whole-brain; TomoDirect; 3D-CRT; Head tilting;
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