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KMID : 0362919930110010175
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Journal of the Korean Society for Therapeutic Radiology and Oncology
1993 Volume.11 No. 1 p.175 ~ p.181
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Dosimetry and Three Dimensional Planning for Stereotactic Radiosurgery with SIEMENS 6-MV LINAC
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Choi Dong-Rak
Cho Byong-Chul
Suh Tae-Suk
Chung Su-Mi
Choi Il-Bong
Shinn Kyung-Sub
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Abstract
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Radiosurgery requires integral procedure where special devices and computer systems are needed for localization, dose planning and treatment. The aim of this work is to verify the overall mechanical accuracy of our LINAC and develop dose calculation algorithm for LINAC radiosurgery.
The alignment of treatment machine and the performance testing of the entire system were extensively carried out and the basic data such as percent depth dose, off-axis ratio and output factor were measured. A three dimensional treatment planning system for stereotactic radiosurgery has been developed. We used an IBM personal computer with C programming language (IBM personal system/2, Model 80386, 1BM Co., USA) for calcu1ating the dose distribution.
As a result, deviations at isocenter on gantry and table rotation for our treatment machine were acceptable since they were less than 2 ㎜. According to the phantom experiments, the focusing
isocenter were successful by the error of less than 2 ㎜. Finally, the mechanical accuracy of our three dimensional planning system was confirmed by film dosimetry in sphere phantom.
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KEYWORD
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Radiosuregery, Three dimensional planning, Small field dosimetry
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