小型電算機によるラジウム線源の線量分布計算

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Quimby system or Paterson-Parker system have been applied in clinical use as a reliable guide for the dose evaluation of intracavitary implantation of radium sources. Since the sources in the patient are never exactly as prescribed geometries, it is better that the calculation of dose distribution should be based upon the arrangement of the sources in the individual patient. Several computer methods for these dose estimations have been developed, and for the calculation, the methods of accurate approximations have been reported for these fifteen years. In this report, the program and the method of approximations to compute the dose distribution for actual implantation at the routine work with mini-computer were discussed. Conversational mode was applicated to obtain the input data, so the input errors could be easily found out and could be quickly corrected by the key board. The formulas of approximation reported by 4 authors were combined and compared each other, to find out the suitable computation. The images magnified on localization films were corrected to actual length of the sources automatically. Simpson's numerical integral was applied in case of the approximation for the absorption of Pt-filter and for water-air-ratio. The calculation was carried out regarding the line source as five-point sources. The doses were measured in a polystyrene cube phantom with insertion of 10 mg radium tube, and the calculated value agreed well with the experimental value. The dose distribution can be obtained on any desired plane. The area, which was printed out dose distribution, can be easily selected, therefore, the time is saved.
社団法人日本放射線技術学会の論文
1976-11-01

小型電算機によるラジウム線源の線量分布計算

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