Evaluation of Dose Received by Prostate Tumour and Critical organs in 2D and 3D Treatment Planning

Abstract

In this study comparison between 2-dimensional and 3-dmensional techniques for external-beam radiation treatment for prostate cancer is done. Dose homogeneity within the target volume and doses to critical organs, uninvolved anatomic structures were evaluated. Computed tomography (CT) scans of 30 patients with localized prostate cancer (T2N0M0) were acquired and transferred to the treatment planning systems. The target volume and uninvolved structures were contoured on axial CT slices throughout the volume of interest. A comparison of the 2 treatment techniques was performed using isodose distributions, and dose-volume histograms. Dose distribution the same in 2D &3D technique; however, the 2D technique delivers unnecessary radiation doses to the rectum and bladder. It was found that In this study found average (V70, V75 and D95 ) for the rectum 2D it found 35.5%, 32.2% , 34% respectively and for 3D it found 8.4%, 0.2%, 12% respectively also found average (V40, V65 )for the bladder 2D it found 80.8% , 74.9% respectively and for 3D it found 20.4%, 17% respectively Also to RT and LT hip in 2D average V50 found 17 %, 20 % respectively and for 3D was 4 %, 3% respectively. These results show that 3D in the limit, but the 2D higher than the allowable limit, causing a danger to members of sensitive.