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Proceedings Paper

Performance of a flat-panel cardiac detector
Author(s): Paul R. Granfors; Douglas Albagli; J. Eric Tkaczyk; Richard Aufrichtig; Harrie Netel; Gerhard Brunst; John M. Boudry; Dershan Luo
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Paper Abstract

We report the results of performance measurements for an amorphous silicon flat panel detector used in a cardiovascular imaging system. The detector contains 1024 x 1024 elements on a 0.2 mm pitch for an active image area of about 20.5 x 20.5 cm2. The system allows imaging at fluoroscopic and dynamic cardiac record exposure levels at rates of up to 30 Hz. We measured MTF, NPS, DQE, contrast ratio, response uniformity, resolution uniformity, and lag. Measurements were made on 28 production detectors. The MTF was greater than 0.2 at 2.5 cycles/mm. Contrast ratio was several hundred, indicating negligible long range scatter (veiling glare) within the detector. The DQE of the detector was measured at exposures typical of fluoroscopic imaging, dynamic cardiac record imaging, and digital subtraction angiography (DSA). The DQE was at least 0.65, 0.54, and 0.34 at 0, 1, and 2 cycles/mm, respectively, for all of these exposure levels. The response of the detector varied by less than 12% across its surface. The MTF, measured at nine positions over the surface of the detector, was found to have a maximum difference among positions of less than 0.05 at both 1 and 2 cycles/mm. First frame lag was less than 5%.

Paper Details

Date Published: 28 June 2001
PDF: 10 pages
Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); doi: 10.1117/12.430887
Show Author Affiliations
Paul R. Granfors, GE Medical Systems (United States)
Douglas Albagli, GE Corporate Research and Development Ctr. (United States)
J. Eric Tkaczyk, GE Corporate Research and Development Ctr. (United States)
Richard Aufrichtig, GE Medical Systems (United States)
Harrie Netel, GE Medical Systems (United States)
Gerhard Brunst, GE Medical Systems (United States)
John M. Boudry, GE Medical Systems (United States)
Dershan Luo, GE Medical Systems (United States)


Published in SPIE Proceedings Vol. 4320:
Medical Imaging 2001: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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