NDLI: Improved contrast and spatial resolution with single photon counting (SPC) for an area X-ray imager, the newly developed high-resolution Micro-Angiographic Fluoroscopic (MAF) detector

Content Provider	IEEE Xplore Digital Library
Author	Jain, A. Kuhls-Gilcrist, A. Bednarek, D.R. Rudin, S.
Copyright Year	2009
Description	Author affiliation: Toshiba Stroke Research Center, University at Buffalo, Buffalo 14214 NY USA (Jain, A.; Kuhls-Gilcrist, A.; Bednarek, D.R.; Rudin, S.)
Abstract	Although in radiological imaging, the prevailing mode of acquisition is the integration of the energy deposited by all x-rays absorbed in the imaging detector, much improvement in image spatial and contrast resolution could be achieved if each individual x-ray photon were detected and counted separately. In this work we compare the conventional energy integration (EI) mode with the new single photon counting (SPC) mode for a recently developed high-resolution Micro-Angiographic Fluoroscopic (MAF) detector, which is uniquely capable of both modes of operation. The MAF has 1024×1024 pixels of 35 microns effective size and is capable of real-time imaging at 30 fps. The large variable gain of its light image intensifier (LII) provides quantum limited operation with essentially no additive instrumentation noise and enables the MAF to operate in both EI and the very sensitive low-exposure SPC modes. We used high LII gain with very low exposure (<1 x-ray photon/pixel) per frame for SPC mode and higher exposure per frame with lower gain for EI mode. Multiple signal-thresholded frames were summed in SPC mode to provide an integrated frame with the same total exposure as EI mode. A heavily K-edge filtered x-ray beam (average energy of 31 keV) was used to provide a nearly monochromatic spectrum. The MTF measured using a standard slit method showed a dramatic improvement for the SPC mode over the EI mode at all frequencies. Images of a line pair phantom also showed improved spatial resolution with 12 lp/mm visible in SPC mode compared to only 8 lp/mm in EI mode. In SPC mode, images of human distal and middle phalanges showed the trabecular structures of the bone with far better contrast and detail. These improvements with the SPC mode should be advantageous for clinical applications where high resolution and/or high contrast are essential such as in mammography and extremity imaging as well as for dual modality applications, which combine nuclear medicine and x-ray imaging using a single detector.
Starting Page	3012
Ending Page	3016
File Size	656912
Page Count	5
File Format	PDF
ISBN	9781424439614
ISSN	10957863
DOI	10.1109/NSSMIC.2009.5401587
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spatial resolution X-ray imaging X-ray detection X-ray detectors High-resolution imaging Optical imaging Image resolution Additive noise Energy resolution Pixel
Content Type	Text
Resource Type	Article

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Improved contrast and spatial resolution with single photon counting (SPC) for an area X-ray imager, the newly developed high-resolution Micro-Angiographic Fluoroscopic (MAF) detector

Improved contrast and spatial resolution with Single Photon Counting (SPC) for an area x-ray imager, the newly developed high-resolution Micro-Angiographic Fluoroscopic (MAF) detector

Evaluation of the Micro-Angiographic Fluoroscope as a High-Resolution, Single-Photon Counting and Energy-Integrating Imager for Transmission and Emission Imaging

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