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Proceedings Paper

Detector, collimator and real-time reconstructor for a new scanning-beam digital x-ray (SBDX) prototype
Author(s): Michael A. Speidel; Michael T. Tomkowiak; Amish N. Raval; David A. P. Dunkerley; Jordan M. Slagowski; Paul Kahn; Jamie Ku; Tobias Funk
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Paper Abstract

Scanning-beam digital x-ray (SBDX) is an inverse geometry fluoroscopy system for low dose cardiac imaging. The use of a narrow scanned x-ray beam in SBDX reduces detected x-ray scatter and improves dose efficiency, however the tight beam collimation also limits the maximum achievable x-ray fluence. To increase the fluence available for imaging, we have constructed a new SBDX prototype with a wider x-ray beam, larger-area detector, and new real-time image reconstructor. Imaging is performed with a scanning source that generates 40,328 narrow overlapping projections from 71 x 71 focal spot positions for every 1/15 s scan period. A high speed 2-mm thick CdTe photon counting detector was constructed with 320x160 elements and 10.6 cm x 5.3 cm area (full readout every 1.28 s), providing an 86% increase in area over the previous SBDX prototype. A matching multihole collimator was fabricated from layers of tungsten, brass, and lead, and a multi-GPU reconstructor was assembled to reconstruct the stream of captured detector images into full field-of-view images in real time. Thirty-two tomosynthetic planes spaced by 5 mm plus a multiplane composite image are produced for each scan frame. Noise equivalent quanta on the new SBDX prototype measured 63%-71% higher than the previous prototype. X-ray scatter fraction was 3.9-7.8% when imaging 23.3-32.6 cm acrylic phantoms, versus 2.3- 4.2% with the previous prototype. Coronary angiographic imaging at 15 frame/s was successfully performed on the new SBDX prototype, with live display of either a multiplane composite or single plane image.

Paper Details

Date Published: 18 March 2015
PDF: 11 pages
Proc. SPIE 9412, Medical Imaging 2015: Physics of Medical Imaging, 94121W (18 March 2015); doi: 10.1117/12.2081716
Show Author Affiliations
Michael A. Speidel, Univ. of Wisconsin, Madison (United States)
Michael T. Tomkowiak, Univ. of Wisconsin, Madison (United States)
Amish N. Raval, Univ. of Wisconsin, Madison (United States)
David A. P. Dunkerley, Univ. of Wisconsin, Madison (United States)
Jordan M. Slagowski, Univ. of Wisconsin, Madison (United States)
Paul Kahn, Triple Ring Technologies, Inc. (United States)
Jamie Ku, Triple Ring Technologies, Inc. (United States)
Tobias Funk, Triple Ring Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 9412:
Medical Imaging 2015: Physics of Medical Imaging
Christoph Hoeschen; Despina Kontos, Editor(s)

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