A modified 60C teletherapy unit for total body irradiation
Details
Serval ID
serval:BIB_31526D4D5065
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A modified 60C teletherapy unit for total body irradiation
Journal
International Journal of Radiation Oncology, Biology, Physics
ISSN
0360-3016
Publication state
Published
Issued date
11/1995
Peer-reviewed
Oui
Volume
33
Number
4
Pages
951-7
Notes
Journal Article --- Old month value: Nov 1
Abstract
PURPOSE: A modified teletherapy unit to achieve total body irradiation with a vertical beam in a conventional treatment room. METHODS AND MATERIALS: A standard 60C teletherapy unit has been modified to achieve total body irradiation with a vertical beam in a conventional treatment room. Patients are treated in prone and supine positions. Removal of the adjustable collimator assembly of this standard machine provides a circular field of 196 cm in diameter at 167 cm from the source. Second, the machine has been elevated by about 50 cm on a metallic base to enlarge irradiation field to obtain 248 cm in diameter at 210 cm from the source, and to encompass tall patients under better conditions. A special lead conical beam flattening filter, 10-mm thick at the center, was designed to compensate the spatial inhomogeneity of the beam. An instantaneous dose rate of 6.10(-2) Gy/min is attained at the L4 level (midplane) in an average 20-cm thick patient with a source activity of 5099 RHM (air kerma rate of 44.8 Gy.h-1.m2). Between February 2, 1984 and December 27, 1990, 244 total body irradiations were performed either by single dose (n = 69, 10 Gy were given to midplane at L4 level in about 6 to 8 h, 8 Gy to the lungs), or by fractionated dose (n = 175, 12 Gy were given in 6 fractions over 3 consecutive days to midplane at L4 level, 9 Gy to the lungs). RESULTS: The dose distribution is similar than the ones obtained by a linear accelerator with patients lying on their sides. CONCLUSION: Patients were treated in a comfortable and highly reproductible position. Organ shielding was easily achievable. This could be a less expensive and reasonable alternative to linear accelerator.
Keywords
Cobalt Radioisotopes/*therapeutic use
Equipment Design
Humans
Radiation Protection
Radioisotope Teletherapy/*instrumentation/methods
Whole-Body Irradiation/*instrumentation/methods
Pubmed
Web of science
Create date
24/01/2008 18:15
Last modification date
20/08/2019 14:16