Comparison in image quality and noise component of columnar phosphor plate and powder phosphor plate

Katsumi Shimada; Hiroaki Yasuda; Satoshi Arakawa; Takao Kuwabara; Atsunori Takasu; Yasuo Iwabuchi; Munetaka Katou

doi:10.1117/12.706752

28 March 2007 Comparison in image quality and noise component of columnar phosphor plate and powder phosphor plate

Katsumi Shimada, Hiroaki Yasuda, Satoshi Arakawa, Takao Kuwabara, Atsunori Takasu, Yasuo Iwabuchi, Munetaka Katou

Proceedings Volume 6510, Medical Imaging 2007: Physics of Medical Imaging; 651044 (2007) https://doi.org/10.1117/12.706752
Event: Medical Imaging, 2007, San Diego, CA, United States

Abstract

For Computed Radiography (CR) systems that use a columnar phosphor plate (CPP) and a powder phosphor plate (PPP), we designed the systems to obtain the best image quality. To determine the optimum phosphor layer thickness for each phosphor plate, the relationship between the intensity and spatial spread of photo-stimulated luminescence (PSL), and the phosphor layer thickness of the phosphor plate is quantitatively clarified. Next, to determine the stimulation light intensity, we measured PSL, modulation transfer function (MTF) and detective quantum efficiency (DQE) by varying the stimulation light intensity, using the determined optimum phosphor layer thickness. We also investigated the noise components of each phosphor plate. Results show that, compared to the PPP, the CPP is more favorable in allowing thicker phosphor layer without reduction in MTF. As the result of the relationship between the layer thickness and the PSL, noise analysis, it was confirmed that the CPP could detect PSL in the deep region of the phosphor layer without reducing the intensity of PSL. This suggests that in comparison to the PPP, the CPP can make efficient use of X-ray information, thereby promising to enhance image quality and to reduce exposure dose.

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Katsumi Shimada, Hiroaki Yasuda, Satoshi Arakawa, Takao Kuwabara, Atsunori Takasu, Yasuo Iwabuchi, and Munetaka Katou "Comparison in image quality and noise component of columnar phosphor plate and powder phosphor plate", Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 651044 (28 March 2007); https://doi.org/10.1117/12.706752

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