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Using background subtraction for measuring the dose distribution of an electron pencil beam
Author(s) -
McParland B. J.
Publication year - 1987
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 - 10.1118/1.596057
Subject(s) - collimated light , collimator , bremsstrahlung , imaging phantom , physics , optics , subtraction , electron , photon , linear particle accelerator , beam (structure) , cathode ray , pencil (optics) , dosimetry , background subtraction , monte carlo method , medical physics , nuclear medicine , nuclear physics , mathematics , laser , medicine , pixel , arithmetic , statistics
The spread of a narrow electron beam with depth in a phantom has been measured in the past using either a magnetically focused beam or one that has been collimated. The former approach is usually impractical with therapy accelerators and the latter must contend with the bremsstrahlung photons and scattered electrons that are introduced into the beam. This technical report describes a simple technique in which data taken with a “closed collimator” are subtracted from those measured with the collimator “open.” Such a subtraction process removes much of the background contaminants.