Accuracy of dose distribution calculated by radiotherapy planning computer

It is important to notify the accuracy of dose distribution prepared by Radiotherapy Planning Computer. The following experiment was performed to compare the results of calculation dose by the MODULEX Radiotherapy Planning Computer and measured values. Under the several different conditions of irradiation by 10 MV X-ray Linear Accelerator. The results were shown that the difference between measured values and calculated values were less than 3% and calculated data by Radiotherapy Planning Computer were accurate enough for routine use. The accuracy of computer calculated data depend so much on calculation system and accuracy of input data that careful management of raw data were needed. (author)