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Theoretical optimization of a split septaless xenon ionization detector for dual‐energy chest radiography
Author(s) -
Cardinal H. Neale,
Fenster Aaron
Publication year - 1988
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 - 10.1118/1.596248
Subject(s) - detector , xenon , digital radiography , optics , ionization chamber , slab , x ray detector , materials science , ionization , radiography , energy (signal processing) , physics , nuclear medicine , nuclear physics , medicine , ion , quantum mechanics , geophysics
It is proposed that digital scanned projection radiography of the chest be performed by using an energy‐sensitive septaless xenon ionization detector (SXID) to obtain dual‐energy images. The proposed detector is composed of a front region, sensitive to low‐energy x rays, and a rear region, sensitive to high‐energy x rays, separated by a suitable filter layer. We have developed a simple, precise theoretical formulation for dual‐energy optimization, and applied it to the split SXID. We describe the variation of optimum detector performance with source kilovoltage and filtration (material and thickness), and hence heat loading, under conditions of constant exposure and constant dose. We estimate dose as the average absorbed dose to an equivalent water layer of suitable thickness, assuming slab geometry, so that the calculation is as simple as that for exposure.