Determination of the dose calculations accuracy of 3D-CRT treatment planning

One of the important treatment modality for preventing cancer is radiotherapy. The objectives of radiotherapy are to deliver the recommended dosage to the tumor while preserving as much of the surrounding healthy tissues and the organs at risk (OARs). The aim of this study was to calculate the exact dose to the tumor and less dose to the OARs by modern LINAC based 3D-CRT techniques. In order to ascertain such delivery, computerised treatment planning systems (TPS) were used for calculating the necessary dose distribution based on anatomical arrangements of organs in the body, which in turn are depended on CT simulation of individual patient and the basic dosage parameters of the LINAC. The quality assurance (QA) tests had to be conducted for determining whether the intended radiation dosage would provide the patient with the appropriate dose distribution. In this present work, elaborate dose calculations of 20 different cancer patients with 6 MV and 15 MV photon beams and 6 MeV electron beam were performed. The laboratory assesments were carried out at Ahsania Mission Cancer and General Hospital, Uttara, Dhaka.