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SU‐E‐T‐756: The Verification of Accuaracy in Dose Distribution Using Superpositon and Convolution Algorithm including Couch for TomoDirect
Author(s) -
Park K,
Choi W,
Kum O
Publication year - 2011
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.3612720
Subject(s) - convolution (computer science) , imaging phantom , attenuation , dosimetry , algorithm , nuclear medicine , mathematics , computer science , physics , optics , artificial intelligence , medicine , artificial neural network
Purpose: The purpose of this study is to verify the accuracy of superposition and convolution(S/C) algorithm for the dose distribution which would be perturbed by the carbon fiber couch(CFC) focused on the photon attenuation. Methods: we perform the experiment using TomoDirect that irradiates every 15 degrees from the incident angle with 1, 2.5 and 5 cm jaw‐spacing. We measure the delivered dose to cylindrical cheese phantom to compare with planned one from TPS. Results: What we have found is quite interesting and important clinically. The percentage difference between delivered and planned dose up to 5\% in specific gantry angle, which is our preliminary experiment. Based on the result, the effect of CFC was not efficiently implemented in TPS. Conclusions: From this preliminary works, we can conclude that the effect of CFC is not sufficiently implemented to TPS for TomoDirect in certain gantry angle. Also for the issue of the verification of S/C algorithm from the TPS of TomoDirect, it is working properly unless x—ray does pass through CFC partially.