title: Total body irradiation with step translation and dynamic field matching.
abstract: The purpose of this study is to develop a total body irradiation technique that does not require additional devices or sophisticated processes to overcome the space limitation of a small treatment room. The technique aims to deliver a uniform dose to the entire body while keeping the lung dose within the tolerance level. The technique treats the patient lying on the floor anteriorly and posteriorly. For each AP/PA treatment, two complementary fields with dynamic field edges are matched over an overlapped region defined by the marks on the body surface. A compensator, a spoiler, and lung shielding blocks were used during the treatment. Moreover, electron beams were used to further boost the chest wall around the lungs. The technique was validated in a RANDO phantom using GAFCHROMIC films. Dose ratios at different body sites along the midline ranged from 0.945 to 1.076. The dose variation in the AP direction ranged from 96.0% to 104.6%. The dose distribution in the overlapped region ranged from 98.5% to 102.8%. Lateral dose profiles at abdomen and head revealed 109.8% and 111.7% high doses, respectively, at the body edges. The results confirmed that the technique is capable of delivering a uniform dose distribution to the midline of the body in a small treatment room while keeping the lung dose within the tolerance level.
authors: Department of Radiation Oncology, Taichung Veterans General Hospital, 1650 Taiwan Boulevard Sect. 4, Taichung 40705, Taiwan.
authors: Ho-Hsing
authors: HH
authors: Chen
authors: Jay
authors: J
authors: Wu
authors: Keh-Shih
authors: KS
authors: Chuang
authors: Jia-Fu
authors: JF
authors: Lin
authors: Jia-Cheng
authors: JC
authors: Lee
authors: Jin-Ching
authors: JC
authors: Lin
mesh_terms: D006801:Humans; D008168:Lung / Q000528:radiation effects*; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D014916:Whole-Body Irradiation / Q000379:methods*
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