Conference proceeding
Detector, collimator and real-time reconstructor for a new scanning-beam digital x-ray (SBDX) prototype
MEDICAL IMAGING 2015: PHYSICS OF MEDICAL IMAGING, Vol.9412, pp.94121W-94121W-11
Proceedings of SPIE
01/01/2015
DOI: 10.1117/12.2081716
PMCID: PMC4517476
PMID: 26236071
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 mu 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 2.34.2% 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.
Details
- Title: Subtitle
- Detector, collimator and real-time reconstructor for a new scanning-beam digital x-ray (SBDX) prototype
- Creators
- Michael A. Speidel - University of Wisconsin–MadisonMichael T. Tomkowiak - University of Wisconsin–MadisonAmish N. Raval - University of Wisconsin–MadisonDavid A. P. Dunkerley - Univ Wisconsin, Dept Med Phys, Madison, WI 53706 USAJordan M. Slagowski - University of Wisconsin–MadisonPaul Kahn - Triple Ring TechnologiesJamie Ku - Triple Ring TechnologiesTobias Funk - Triple Ring Technologies
- Contributors
- C Hoeschen (Editor)D Kontos (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- MEDICAL IMAGING 2015: PHYSICS OF MEDICAL IMAGING, Vol.9412, pp.94121W-94121W-11
- Publisher
- Spie-Int Soc Optical Engineering
- Series
- Proceedings of SPIE
- DOI
- 10.1117/12.2081716
- PMID
- 26236071
- PMCID
- PMC4517476
- ISSN
- 0277-786X
- eISSN
- 1996-756X
- Number of pages
- 11
- Language
- English
- Date published
- 01/01/2015
- Academic Unit
- Radiation Oncology
- Record Identifier
- 9984313071002771
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