NDLI: Ct Image Noise and Resolution Behavior in Rc Filter-Based Projection Data Acquisition

Content Provider	IEEE Xplore Digital Library
Author	Lim, Chun Bin Warden, Earl Haque, Promod
Copyright Year	1963
Abstract	This paper deals with the image noise behavior due to photon fluctuation in a CT system based on RC low-pass filter for projection data acquisition. The system configuration considered consists of a stationary detector ring and a rotating x-ray source with convolution-based detector fan image reconstruction. The current generated in individual detectors by transmitted photons during x-ray source rotation is fed into a RC filter and its output is sampled at regular time intervals matched to a basic spatial sampling distance. A projection ray sample is formed by either one or multiple time samples depending upon scan speed. An analytical model of photon noise propagation has been established for this system that characterizes its noise behavior and compares the behavior to the case with active integrators. In general, RC sampling introduces positive correlation between basic time samples, and in turn, between projection samples. This results in varying noise behavior for different scan speeds under a constant dose. The noise behavior is also affected by the reconstruction filters through the positive or negative correlations, which depend on the filter coefficients. Basically, it acts as a smoothing hardware filter which suppresses high frequency noise at an early stage of data acquisition. The impact of RC filtering on spatial resolution is also mentioned.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	152
Ending Page	160
Page Count	9
File Size	1668922
File Format	PDF
ISSN	00189499
Volume Number	28
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1981-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image resolution Data acquisition Low pass filters X-ray detection X-ray detectors X-ray imaging Image reconstruction Active noise reduction Fluctuations Computed tomography
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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