Vol 27, No 2 (2022)
Research paper
Published online: 2022-03-17

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Total body irradiation for standard treatment rooms: a robust sweeping beam technique with respect to the body shape

Iva Bratova1, Petr Paluska1, Jakub Grepl12, Igor Sirak1, Jiri Petera1, Milan Vosmik1
Rep Pract Oncol Radiother 2022;27(2):268-274.

Abstract

Background: The purpose of this work is to improve a sweeping beam technique for total body irradiation (TBI) on a low flat couch using a varying patient thickness model. We designed a flat couch for total body irradiation in supine and prone position. Three generic arcs with rectangular segments for a patient torso thickness of 16, 22 and 28 cm were generated with respect to varying patient thickness of four particular parts of the body: head, torso, thighs and calves.

Materials and methods: Longitudinal and transversal dose profiles were measured using an ionization chamber and the EBT3 gafchromic film in a solid water slab phantom. The robustness of the method was examined in phantoms of different thicknesses.

Results: Measured dose homogeneity stays within ±10% of prescribed dose for all of the three patient thickness models. The robustness of the method was evaluated as the increase in dose in the phantom center of 0.7% per 1 cm reduction in phantom thickness.

Conclusion: The method is applicable for the broad range of patient sizes, comfortable for patients, robust and suitable for standard treatment rooms with a standard linear accelerator. It requires minimal investments into equipment.

 

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