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KMID : 1164219890030010027
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Journal of Korean Society for Radiotherapeutic Technology
1989 Volume.3 No. 1 p.27 ~ p.36
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Calculation of Tissue-Air Ratios(TAR) in Irregularly shaped Field for Co-60 Gamma Radiation
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Ji Young-Hoon
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Abstract
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In order to calculate the dose on each interest point in five types of irregularly shaped fields used commonly in radiotherapy, the tissue-air ratios (TAR) in these fields for Go-60 gamma radiation were calculated using the newly devised SAR-chart. The TARs calculated from newly method of using the SAR-chart, computer method and approximation method at the interest point were compared to the TARs obtained from measurement. The result are as follows; In case of the interest points on central axis the calculated TARs in irregularly shaped fields by the above mentioned methods were well agreed within the error of , whereas for the interest points on off-axis the calculated TARs were resulted in the maximum errors of and respectively. From these results, the accuracy of calculation method of using the SAR-chart was comfirmed.
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KEYWORD
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