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Experimental dual xenon detectors for quantitative CT and spectral artifact correction
Author(s) -
Drost D. J.,
Fenster A.
Publication year - 1980
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 - 10.1118/1.594672
Subject(s) - xenon , artifact (error) , detector , physics , nuclear medicine , optics , medical physics , materials science , nuclear physics , computer science , medicine , artificial intelligence
A 41‐channel xenon detector array has been built in our laboratory to be used in a fan‐beam CT scanner. Each channel is split into a front and rear detector producing two signals for each ray through the patient. Since the front and rear detectors measure different photon energies of the x‐ray spectra, dual energy information is obtained from a single CT scan. This information can be used to determine electron density and effective atomic number images of the patient and correct spectral artefacts. A 7.7‐cm‐diam plexiglas cylinder, filled with water and various plastics, was scanned. With this phantom, electron density was determined to an accuracy of 2% and effective atomic number to 4%. Details of the detector design and calibration are discussed and electron density, effective atomic number, and spectral artifact corrected images are presented.