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Verification of the correspondence between CT‐simulated and treatment beams
Author(s) -
Fallone B. G.,
Evans M. D. C.,
Clark B. G.,
Podgorsak E. B.
Publication year - 1998
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 - 10.1118/1.598256
Subject(s) - isocenter , imaging phantom , collimator , linear particle accelerator , strips , beam (structure) , radiation treatment planning , position (finance) , computed radiography , radiography , optics , medical imaging , nuclear medicine , materials science , dosimetry , computer science , physics , radiation therapy , computer vision , artificial intelligence , radiology , medicine , nuclear physics , image quality , finance , economics , image (mathematics)
A single phantom technique has been developed to verify the full CT simulation and treatment‐beam delivery procedures. The phantom consists of a target delineated by thin copper strips, affixed to therapy verification film, and inserted securely between two slices of water‐equivalent material. The target is defined with the aid of the copper strips, and the position of the isocenter and beam parameters such as field size, and gantry and collimator angle are determined by CT simulation. With these parameters, the phantom is subsequently irradiated by the linear accelerator in the treatment position. Correspondence between the planned and the irradiated region is determined by the position of the copper strips on the film. The technique is a simple and practical method for verifying the entire CT simulation and treatment‐beam delivery processes, and provides a permanent record of the correspondence between the planning digitally reconstructed radiographs (DRR) and the actual beam delivered.