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KMID : 0357520070300010033
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Journal of Radiological Science and Technology
2007 Volume.30 No. 1 p.33 ~ p.38
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Quality Assurance on Dose Distribution of Ir-192 Line Source
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Kim Jon-Eon
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Abstract
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The propose of this study is a verification of the correct calculation of the dose around source and the prescription dose of Ir-192 source in the plato treatment planning system. The source and orthogonal coordinates for lateral direction and those for the anterior posterior direction were drawn on a A4 paper and then input into the system. The prescription dose was prescribed to two points with radius 1 cm in the direction of polar angle and from the center of the source. The doses of prescription point and dose points acquired from the treatment planning system were compared with those from manual calculation using the geometry function formalism derived by Paul King et al. In this analysis, the doses of prescription point were exactly consistent with each other and those of dose points were obtained within the error point of 1.85%. And the system of accuracy was evaluated within 2% of tolerance error. Therefore, this manual dose calculation used for the geometry function formalism is considered to be useful in clinics due to its convenience and high quality assurance.
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KEYWORD
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Geometry function, Ir-192 source, Dose calculation
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