Radioterapi Linac Energi 6 MV Terhadap Kanker Serviks Pada Organ Rektum Menggunakan Teknik 3DCRT dan IMRT Di RSUP Sanglah Denpasar

Abstract

Cervical cancer radiotherapy on the Linac aircraft uses a 6 MV energy photon beam with 3 Dimension Conformal Radiotherapy (3DCRT) and Intensity Modulation Radiation Therapy (IMRT) techniques. Radiotherapy planning on the 3DCRT and IMRT techniques is then compared by analyzing the dose distribution or planning target volume (PTV) coverage through the Conformity Index (CI) and Homogeneity Index (HI) and Organ At Risk (OAR) where the risk organ that is considered is the rectum. In this study, 30 data on cervical cancer patients were used at the Radiotherapy Installation at Sanglah Hospital Denpasar with a plan using a box system on the 3DCRT technique and the IMRT technique with rotation angles of 00, 900, 1800, and 2700 and a radiation dose of 5000 cGy. Comparison of these two techniques is done by analyzing the Dose Volume Histogram (DVH) curve on PTV coverage on the Treatment Planning System (TPS) computer. The results of this study indicate that the average CI value in the 3DCRT technique is 1.017542 while the IMRT technique is 1.019668, with the Mann Whitney test (Asymp.Sig = 0.492). Likewise, the HI value, where the 3DCRT technique averaged 0.089494 while the IMRT technique was 0.093126 with Mann Whitney test (Asymp.Sig = 0.487), both CI and HI values were not significant. While the percentage of the average dose of the rectum on both the 3DCRT and IMRT irradiation techniques are 96% and 87%, respectively. Cervical cancer radiotherapy using IMRT technique can minimize the absorbed dose in OAR (rectum).