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Correction for distortion in a beam outline transfer device in radiotherapy CT‐based simulation
Author(s) -
Ragan Don P.,
He Tongming,
Liu Xunliang
Publication year - 1993
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 - 10.1118/1.597082
Subject(s) - scanner , distortion (music) , beam (structure) , computer science , calibration , projection (relational algebra) , dosimetry , medical physics , optics , simulation , physics , nuclear medicine , artificial intelligence , algorithm , medicine , computer network , amplifier , bandwidth (computing) , quantum mechanics
In using a CT scanner as a radiation therapy simulator, it would be helpful to be able to transfer the beam outline from the computer plan to the patient's skin. A beam outline transfer device has been constructed and installed on a Siemens' DRH CT scanner gantry. The planned treatment beam geometry from a 3‐D computerized simulation and planning system can be projected onto the patient's skin surface accurately and efficiently. The positioning accuracy achieved is within ±0.1 cm over a 20 cm×20 cm field. Integrating the device into the CT scanner, simplifies the device and reduces the cost over an externally mounted device. Two unsuccessful methods to correct the projection distortions are also mentioned. In order to achieve the reported beam outline transfer accuracy, a system based on our empirically derived calibration procedure is described.