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Proceedings Paper

Development and evaluation of a digital radiography system using a large-area flat panel detector
Author(s): Shigeyuki Ikeda; Katsumi Suzuki; Ken Ishikawa; Richard E. Colbeth; Chris Webb; Saori Tanaka; Kenji Okusako
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Paper Abstract

We developed prototype Digital Subtraction Angiography (DSA) System with a new large area FPD. Dynamic range, MTF, Contrast ratio and line noise were much improved. The improved FPD is a scintillator-type detector, and has a 40 x 30 cm active area, 2048 x 1536 matrix with 194um pixel pitch. The Prototype DSA system has two x-ray detectors, the FPD and the I.I.-CCD camera, and we can choose them on demand. All images captured from both detectors at 3 frames/sec in DSA mode and 30 frames/sec in Fluoroscopy mode are forwarded to our image-processing unit. We applied the new DSA system to more than 150 studies and compared the results with images from the I.I.-CCD. In DSA mode, FPD System, which has a wide dynamic range, large detecting area, and good contrast ratio yielded superior angiogram images compared with the I.I-CCD system. In Fluoroscopy mode, we improved line noise and increased the contrast of catheters and guide wires with a new image processing technique. With these improvements, the image quality of the FPD System is superior to the I.I.-CCD system at the exposure range of over 2uR/frame (17.4 nGy/frame).

Paper Details

Date Published: 5 June 2003
PDF: 11 pages
Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); doi: 10.1117/12.479992
Show Author Affiliations
Shigeyuki Ikeda, Hitachi Medical Corp. (Japan)
Katsumi Suzuki, Hitachi Medical Corp. (Japan)
Ken Ishikawa, Hitachi Medical Corp. (Japan)
Richard E. Colbeth, Varian Medical Systems (United States)
Chris Webb, Varian Medical Systems (United States)
Saori Tanaka, Osaka City Univ. Hospital (Japan)
Kenji Okusako, Osaka City Univ. Hospital (Japan)

Published in SPIE Proceedings Vol. 5030:
Medical Imaging 2003: Physics of Medical Imaging
Martin J. Yaffe; Larry E. Antonuk, Editor(s)

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