Physical and psychophysical analysis of laser readout conditions for imaging plates in computed radiography

Brigid Gerety; Hans Roehrig; George W. Seeley; Tinglan Ji; David A. Yocky; Bryan Westerman; Theron W. Ovitt

doi:10.1117/12.18839

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1 July 1990 Physical and psychophysical analysis of laser readout conditions for imaging plates in computed radiography

Brigid Gerety, Hans Roehrig, George W. Seeley, Tinglan Ji, David A. Yocky, Bryan Westerman, Theron W. Ovitt

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Proceedings Volume 1232, Medical Imaging IV: Image Capture and Display; (1990) https://doi.org/10.1117/12.18839
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

Abstract

Computed radiography uses a photostimulable phosphor coated imaging plate which is exposed to x-rays and laser read to form an image. After laser reading, there is a considerable amount of energy remaining on the imaging plate which is not used. This study simulated a change in the laser readout process to utilize more of the energy on the image plate, and potentially improve image quality without changing exposure factors. Images of a contrast detail phantom were made before and after alteration of the readout process and analyzed by both physical and psychophysical means. It was found that there is an increase in the signal-to-noise ratio, when measured with an aperture of the size of a single pixel (linear dimension about 0.15 mm). However there is no change in the signal-to-noise ratio, when measured with apertures of the size of 0.75 mm (5 x 5 pixels) and 1.5 mm (10 x 10 pixels). This agrees with the results of the contrast detail study: after alteration, the observers did not detect smaller objects than they had before the alteration. It appears the imaging plate readout process is fairly optimized.

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Brigid Gerety, Hans Roehrig, George W. Seeley, Tinglan Ji, David A. Yocky, Bryan Westerman, and Theron W. Ovitt "Physical and psychophysical analysis of laser readout conditions for imaging plates in computed radiography", Proc. SPIE 1232, Medical Imaging IV: Image Capture and Display, (1 July 1990); https://doi.org/10.1117/12.18839

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