Anika Jahnke1, Lennart Jahnke2, Flavia Molina-Duran3, Michael Ehmann2, Steffi Kantz4, Volker Steil2, Frederik Wenz2, Gerhard Glatting5, Frank Lohr2, Martin Polednik2. 1. Medical Radiation Physics/Radiation Protection, Universitätsmedizin Mannheim, Heidelberg University, Mannheim, Germany; Department of Radiation Oncology, Universitätsmedizin Mannheim, Heidelberg University, Mannheim, Germany. Electronic address: anika.jahnke@medma.uni-heidelberg.de. 2. Department of Radiation Oncology, Universitätsmedizin Mannheim, Heidelberg University, Mannheim, Germany. 3. Medical Radiation Physics/Radiation Protection, Universitätsmedizin Mannheim, Heidelberg University, Mannheim, Germany; Department of Radiation Oncology, Universitätsmedizin Mannheim, Heidelberg University, Mannheim, Germany. 4. Department of Radiation Oncology, Klinikum der Ludwig-Maximilians-Unversität München, Germany. 5. Medical Radiation Physics/Radiation Protection, Universitätsmedizin Mannheim, Heidelberg University, Mannheim, Germany.
Abstract
BACKGROUND AND PURPOSE: We developed a simple and robust total body irradiation (TBI) method for standard treatment rooms that obviates the need for patient translation devices. METHODS AND MATERIALS: Two generic arcs with rectangular segments for a patient thickness of 16 and 20 cm (arc16/arc20) were generated. An analytical fit was performed to determine the weights of the arc segments depending on patient thickness and gantry angle. Stability and absolute dose for both arcs were measured using EBT3 films in a range of solid water slab phantom thicknesses. Additionally ionization chamber measurements were performed every 10 cm at a source surface distance (SSD) of ∼ 200 cm. RESULTS: The measured standard deviation for arc16 is ± 3% with a flatness ⩽ 9.0%. Arc20 had a standard deviation of ± 3% with a flatness ⩽ 7.3% for all measured thicknesses. The theoretical curves proved to be accurate for the prediction of the segment weightings for the two arcs. In vivo measurements for the first 22 clinical patients showed a dose deviation of less than 3%. CONCLUSIONS: Arc therapy is a convenient and stable method for TBI. This cost-effective approach has been introduced clinically, obviating the need for field patches and to physically move the patient.
BACKGROUND AND PURPOSE: We developed a simple and robust total body irradiation (TBI) method for standard treatment rooms that obviates the need for patient translation devices. METHODS AND MATERIALS: Two generic arcs with rectangular segments for a patient thickness of 16 and 20 cm (arc16/arc20) were generated. An analytical fit was performed to determine the weights of the arc segments depending on patient thickness and gantry angle. Stability and absolute dose for both arcs were measured using EBT3 films in a range of solid water slab phantom thicknesses. Additionally ionization chamber measurements were performed every 10 cm at a source surface distance (SSD) of ∼ 200 cm. RESULTS: The measured standard deviation for arc16 is ± 3% with a flatness ⩽ 9.0%. Arc20 had a standard deviation of ± 3% with a flatness ⩽ 7.3% for all measured thicknesses. The theoretical curves proved to be accurate for the prediction of the segment weightings for the two arcs. In vivo measurements for the first 22 clinical patients showed a dose deviation of less than 3%. CONCLUSIONS: Arc therapy is a convenient and stable method for TBI. This cost-effective approach has been introduced clinically, obviating the need for field patches and to physically move the patient.
Authors: Petra M Härtl; Marius Treutwein; Matthias G Hautmann; Manuel März; Fabian Pohl; Oliver Kölbl; Barbara Dobler Journal: Radiat Oncol Date: 2016-06-10 Impact factor: 3.481
Authors: Andreas Springer; Josef Hammer; Erwin Winkler; Christine Track; Roswitha Huppert; Alexandra Böhm; Hedwig Kasparu; Ansgar Weltermann; Gregor Aschauer; Andreas L Petzer; Ernst Putz; Alexander Altenburger; Rainer Gruber; Karin Moser; Karin Wiesauer; Hans Geinitz Journal: Radiat Oncol Date: 2016-03-22 Impact factor: 3.481