Design and performance of a new a-Si flat-panel imager for use in cardiovascular and mobile C-arm imaging systems

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

doi:10.1117/12.536054

6 May 2004 Design and performance of a new a-Si flat-panel imager for use in cardiovascular and mobile C-arm imaging systems

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

Author Affiliations +

Proceedings Volume 5368, Medical Imaging 2004: Physics of Medical Imaging; (2004) https://doi.org/10.1117/12.536054
Event: Medical Imaging 2004, 2004, San Diego, California, United States

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.

Citation Download Citation

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, and Richard E. Colbeth "Design and performance of a new a-Si flat-panel imager for use in cardiovascular and mobile C-arm imaging systems", Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); https://doi.org/10.1117/12.536054

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available