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KMID : 0384620060170040192
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Korean Journal of Medical Physics
2006 Volume.17 No. 4 p.192 ~ p.200
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Evaluation of the Positional Accuracy of the Delivered Beams from the Target: A Phantom Study
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Kang Sei-Kwon
Jo Byung-Chul
Cheong Kwang-Ho
Ju Ra-Heng
Kim Su-San
Kim Kyoung-Joo
Choi Sang-Gu
Bae Hoon-Sik
Lee Re-Na
Oh Do-Hoon
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Abstract
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We evaluated the positional accuracy of the delivered beams to the target in a phantom by simulating the whole process of the radiation treatments Including CT scanning, planning and beam exposures with MLCs. For this purpose, a phantom was made to calibrate the alignment between the CT and the attached laser system. A new, convenient method was also devised to align the setup lasers in the treatment room. Film was used for the Identification of the delivered beam and analyzed with a homemade computer program. The positional differences between the target and the beam centers varied with the couch rotations. The accelerator we used showed a maximum discrepancy of 2.0 mm at the table angle of . The same measurements based on the new isocenter from the Winston-Lutz test resulted in the maximum of 1.35 mm for all rotation angles. The evaluation of the differences between the target and the beam centers is useful for the treatment planning.
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KEYWORD
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Radiation therapy, CT simulation, Positional accuracy of beam delivery, Phantom, Winston-Lutz test
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