Analysis of 6 MV Energy Quality File Index using Percentage Depth Dose (PDD) and Tissue Phantom Ratio (TPR) Methods on Linac Siemens and Electa
Keywords:
PDD, TPR, SSD, Photon, Quality File Index.Abstract
Patient dose in the Linac Electa and Siemens determined with Source Surface Distance (SSD) technique using Precentage Depth Dose (PDD) method and Source Axis Distance (SAD) technique using Tissue Phantom Ratio (TPR) method. The study was conducted by measuring the PDD and calculating the TPR to compare the calculation of the beam quality index on the Linear plane of photon energy at a measurement of 6 MV. PDD is done with a 100 cm SSD technique at a depth of 0 cm to 25 cm. The calculation of TPR is done at SAD position of 100 cm at depth of 10 cm and 20 cm with standard field 10 cm x 10 cm. The result of Linac aircraft exposure with big 6 MV photon energy using Tissue Phantom Ratio (TPR) method is greater 0.98%, according to the research result obtained 0.66% from TPR Linac Siemens Aircraft, while Linac Elekta 0.67% BATAN standards are allowed at 3%).
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