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Verification of radiotherapy treatments: Computerized analysis of the size and shape of radiation fields
Author(s) -
Leszczynski Konrad W.,
Shalev Shlomo,
Gluhchev Georgi
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 - 10.1118/1.597017
Subject(s) - perimeter , field size , parametrization (atmospheric modeling) , dosimetry , field (mathematics) , orientation (vector space) , image guided radiation therapy , mathematics , medical imaging , optics , geometry , beam (structure) , computer science , physics , artificial intelligence , nuclear medicine , medicine , pure mathematics , radiative transfer
An automated technique has been developed for the verification of treatment field size and shape in external beam radiation therapy. Portal images from film or digital on‐line imaging system are analyzed, and basic parameters are derived to describe the field size and shape from the contour points on the field boundary. The initial set of parameters included length of the perimeter, area, aspect ratio, and orientation angle. The parameters found for the actual field in the portal image are compared against those calculated for the prescribed field and any discrepancies indicated to the operator. The accuracy of the field parametrization scheme has been tested on a number of on‐line portal images with varying fields. The relative error did not exceed a few percent in perimeter and area or 2° in the angle, which should be sufficiently low for the detection of major errors in field shaping.