PHOTON-BEAM CHARACTERISTICS ON THE MM50 RACETRACK MICROTRON AND A NEW APPROACH FOR BEAM QUALITY DETERMINATION

被引:53
作者
KARLSSON, M
NYSTROM, H
SVENSSON, H
机构
[1] Radiation Physics Department, University of Umea, S-901 85, Umea
关键词
RACETRACK MICROTRON; MULTI-LEAF COLLIMATOR; PHOTON BEAMS; DOSIMETRY; BEAM QUALITY DETERMINATION; BEAM FLATTENING;
D O I
10.1118/1.597162
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
The photon beams of the MM50 racetrack microtron have special characteristics which make them more suitable than conventional photon beams for precision radiation therapy with good dosimetric control. The beam flattening is obtained by the scanning of an elementary beam instead of using a flattening filter. This will give a number of advantages such as the possibility to optimize field flattening to individual field forms and field sizes. The radiation quality is the same across the whole beam, which gives smaller changes in dose profiles with depth and also makes it easier to perform careful dose planning. Beam collimation is mainly performed by a multileaf collimator and the special design of the treatment head gives nearly ideal characteristics for dose determination in an arbitrary point in the treatment fields. The output factor has been shown to depend almost solely on scattering within the treatment field. The conventional methods for beam quality characterization have been found less suitable at high energies and a new method based on HVL measurements in water is proposed.
引用
收藏
页码:143 / 149
页数:7
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