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Quantitative radiographic imaging using a photostimulable phosphor system
Author(s) -
Floyd Carey E.,
Chotas Harrell G.,
Dobbins James T.,
Ravin Carl E.
Publication year - 1990
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 - 10.1118/1.596569
Subject(s) - repeatability , digital radiography , calibration , radiography , computed radiography , nuclear medicine , pixel , optics , detective quantum efficiency , sensitivity (control systems) , noise (video) , materials science , mathematics , physics , medicine , computer science , artificial intelligence , image quality , radiology , statistics , image (mathematics) , electronic engineering , engineering
We have evaluated a photostimulable phosphor x‐ray imaging system [Philips Computed Radiography (PCR) system] for use in quantification of x‐ray exposure in diagnostic radiography. An exponential function was fitted to data yielding quantitative x‐ray exposure values as a function of digital pixel values. We investigated several factors that affect the accuracy of exposure measurement using the PCR including repeatability, background noise as a function of time delay between plate erasure and use, sensitivity variation between different plates, nonuniformity of sensitivity within a plate, decay of the latent image between time of exposure and readout (observed as a change in sensitivity), and the accuracy with which the (exponential) calibration function yields exposure values as a function of digital pixel values. The calibration was performed over the exposure range from 5.1×10 −9 to 2.0×10 −5 C/kg (0.02–75 mR). The accuracy of exposure measurements made with a single imaging plate is between 1.6% and 4.2%. If measurements from several plates are involved, the uncertainty in the final measurement will be between 5% and 5.9%.