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
Author(s)
Dominique  C., Schwartz  L. H., Lescrainier  J., Keraudy  K., Belkacemi  Y., Foulquier  J. N., Ozsahin  M., Lefkopoulos  D., Pene  F.
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
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