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Multisegmented ion chamber for CT scanner dosimetry
Author(s) -
Moore Marleen M.,
Cacak Robert K.,
Hendee William R.
Publication year - 1981
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 - 10.1118/1.595022
Subject(s) - ionization chamber , dosimetry , scanner , imaging phantom , thermoluminescent dosimeter , optics , nuclear medicine , beam (structure) , materials science , physics , ionization , medical physics , dosimeter , ion , medicine , quantum mechanics
A multisegmented, ionization chamber capable of determining dosimetric profiles from a CT scanner has been developed and tested. The chamber consists of a number of 2 mm wide electrically isolated segments from which ionization currents may be measured. Presented here are the performance characteristics of the chamber including energy response, dose linearity, and corrections for “cross talk” between segments. Sample dosimetric profiles are depicted for 3 and 6 mm nominal beam widths at two locations in a dosimetric phantom positioned in the x‐ray beam of a fourth generation CT scanner. The results agree well with the conventional method of obtaining dosimetry measurements with TLD chips.