Performance of a flat-panel cardiac detector

Paul R. Granfors; Douglas Albagli; J. Eric Tkaczyk; Richard Aufrichtig; Harrie Netel; Gerhard Brunst; John M. Boudry; Dershan Luo

doi:10.1117/12.430887

28 June 2001 Performance of a flat-panel cardiac detector

Paul R. Granfors, Douglas Albagli, J. Eric Tkaczyk, Richard Aufrichtig, Harrie Netel, Gerhard Brunst, John M. Boudry, Dershan Luo

Author Affiliations +

Proceedings Volume 4320, Medical Imaging 2001: Physics of Medical Imaging; (2001) https://doi.org/10.1117/12.430887
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

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%.

Citation Download Citation

Paul R. Granfors, Douglas Albagli, J. Eric Tkaczyk, Richard Aufrichtig, Harrie Netel, Gerhard Brunst, John M. Boudry, and Dershan Luo "Performance of a flat-panel cardiac detector", Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); https://doi.org/10.1117/12.430887

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