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KMID : 0357520160390020177
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Journal of Radiological Science and Technology
2016 Volume.39 No. 2 p.177 ~ p.184
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Evaluation of the Small Field of for the Detector Type Medical Linear Accelerator
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Lee Dong-Woon
Jung Kang-Kyo
Shin Gwi-Soon
Cho Pyong-Kon
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Abstract
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Recently linear accelerator of radiation therapy intensity modulated radiation therapy, stereotactic radiation therapy are widely used. Such radiation treatment techniques are generally difficult to exclude the small field by using the inverse treatment plan. It is necessary to dose an accurate measurement of characteristics of the small field. Thus, using different detectors to measure the volume of the effective percentage depth dose, beam profile, and the output factor of the small field was to evaluate the dose characteristics of each detector. Experimental results for the X-ray beam 6 MV energy beam quality(PDD20/PDD10) is 10 × 10 cm2 Diode detector is as high as 2.4% compared to Pinpoint detector. All field size to lesser effective volume of Diode detector shows that it is far better than other detectors by more than 50% of small penumbra, therefore spatial resolution far excellent. In field size 2 × 2 cm2 Semiflex detector was measured about 2% less than the other detector. Field size 1 × 1 cm2 is that there is no judgment about the validity show the difference between 20%. Field size 1 × 1 cm2 from the measured values of the Diode detector and Pinpoint detector showed a 13% difference. Less than field size 3 × 3 cm2 the feed to the difference between the output factor of the effective volume of the detector to
be used for the effective volume available to the detector.
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KEYWORD
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small field, percentage depth dose, beam quality, beam profile, output factor
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