INHOMOGENITAS PHANTOM EFFECT OF DOSE CALCULATION THROUGH CHANGES IN CURVES PDD (PERCENTAGE DEPTH DOSE) USING EGSnrc MONTE CARLO SIMULATION

• Main Author: CLARISA PUTRI (NIM : 10210098), GISCA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22289
• Institution: Institut Teknologi Bandung

The development of medical equipment technology today runs very rapidly supported by the advancement of engineering science that includes physics, electronics, computers, medicine, and biology. Ideally the most accurate calculation of the dose is to use the technique of Monte Carlo (MC). Although MC techniques are not practical for routine dose calculations, this technique is useful in the development of forecast models dosage calculations. MC technique also provides an important tool to assess valid approximation of the many assumptions that formed in the creation of a practical model. MC technique provides a good method for doing "theoretical experiment" to verify the results of the calculation. To determine the distribution of the dose and the maximum depth will be accepted on the patient's body and then was used the percentage depth dose (PDD) curve. In this study conducted several stages of simulation, which determines the source to be used and determine the phantom used. Linac types used are variants <br /> <br /> <br /> trilogy Clinac iX 10MV photon beam with an area of 10 cm × 10 cm field. Phantom used is modeling inhomogienitas phantom measuring 40 cm × 40 cm × 40 cm. Material such as lung, bone and air depth variation 2 cm, 5 cm and 10 cm. <br /> <br /> <br /> Preliminary results obtained in the form of some curves. From the curve shown that acceptance dose combination of each material is different. The existence of water in the lung and causes the absorption dose phantom decreased. While the presence of bone with the same thickness in phantom causes a dose increase as it passes through the material.