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Proceedings Paper

Design and performance of a new a-Si flat-panel imager for use in cardiovascular and mobile C-arm imaging systems
Author(s): Carlo A. Tognina; Ivan Mollov; Jiann M. Yu; Chris Webb; Pieter G. Roos; Mark Batts; Delenah Trinh; Robert Fong; Nima Taie-Nobraie; Boris Nepo; Isaias D. Job; Keith Gray; Sarah Boyce; Richard E. Colbeth
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Paper Abstract

This paper describes a new flat panel imager designed for use in cardiovascular and mobile C-arm imaging systems. The a-Si sensor array has a 1024 x 1024 matrix with a pixel pitch of 194 μm, resulting in an active area of 198.7 mm x 198.7 mm. The imager allows frame rates of up to 30 fps in full resolution fluoroscopy mode and up to 60 fps in a 2 x 2 binned low dose fluoroscopy mode. Typically, a 600 μm thick deposited columnar CsI(Tl) layer is used as the scintillator. Improvements in the pixel architecture, charge amplifier ASICs, and system level electronics resulted in a very low electronic noise floor, such that both the fluoroscopy and low dose fluoroscopy modes of the panel are x-ray quantum limited below 1 μR/frame. Low power consumption electronics combined with a mechanical design optimized for heat transfer and dissipation makes air-cooling sufficient for most environments. The small size of 24.1 x 24.1 x 6 cm and the weight of only 4.1 kg meet the requirements of C-Arm systems. Special consideration was given to the border around the active area, which has been reduced to 2 cm. Reported performance parameters include linearity, lag, contrast ratio, MTF, and DQE. For the full resolution mode, the MTF is greater than 0.53 and 0.21 at 1 and 2 lp/mm, respectively. DQE measured at 22 nGy/frame was greater than 0.68, 0.50, and 0.23 at 0, 1, and 2 lp/mm, respectively.

Paper Details

Date Published: 6 May 2004
PDF: 9 pages
Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); doi: 10.1117/12.536054
Show Author Affiliations
Carlo A. Tognina, Varian Medical Systems, Inc. (United States)
Ivan Mollov, Varian Medical Systems, Inc. (United States)
Jiann M. Yu, Varian Medical Systems, Inc. (United States)
Chris Webb, Varian Medical Systems, Inc. (United States)
Pieter G. Roos, Varian Medical Systems, Inc. (United States)
Mark Batts, Varian Medical Systems, Inc. (United States)
Delenah Trinh, Varian Medical Systems, Inc. (United States)
Robert Fong, Varian Medical Systems, Inc. (United States)
Nima Taie-Nobraie, Varian Medical Systems, Inc. (United States)
Boris Nepo, Varian Medical Systems, Inc. (United States)
Isaias D. Job, Varian Medical Systems, Inc. (United States)
Keith Gray, Varian Medical Systems, Inc. (United States)
Sarah Boyce, Varian Medical Systems, Inc. (United States)
Richard E. Colbeth, Varian Medical Systems, Inc. (United States)


Published in SPIE Proceedings Vol. 5368:
Medical Imaging 2004: Physics of Medical Imaging
Martin J. Yaffe; Michael J. Flynn, Editor(s)

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