NDLI: Characterization of a pinhole tomograph with 180/spl deg/ acquisition using a discrete vertex set reconstruction algorithm

Content Provider	IEEE Xplore Digital Library
Author	Hewitt, T.A. McKee, B.T.A. Noo, F. Clackdoyle, R. Chamberlain, M.J.
Copyright Year	1999
Description	Author affiliation: Dept. of Phys., Carleton Univ., Ottawa, Ont., Canada (Hewitt, T.A.)
Abstract	Pinhole single photon emission computed tomography (SPECT) offers attractions for thyroid imaging, but acquisition must be limited to 180/spl deg/. The authors have mounted a 3.2 mm pinhole collimator on a rotating gamma camera, magnification 2.1, and characterized its response in the 10 cm field of view (FOV) by imaging points, lines, and a Picker thyroid phantom, comparing both full and half circle data acquisition. Image reconstruction was done with a new Discrete Vertex Set (DVS) algorithm and the Feldkamp (FDK) algorithm. For full circle acquisition, spatial resolution is quite uniform across the FOV, averaging 5.3 mm FWHM, and the reconstructed images show an intensity variation less than 5% in all directions. For this level of noise, the FDK and DVS algorithms perform similarly. For half circle reconstruction, spatial resolution shows more variation across the FOV, averaging 5.4 mm FWHM, and the maximum intensity variation is 20%. Differences between the FDK and DVS algorithms are more apparent. The thyroid phantom and its cold spots can be visualized in both full and half circle reconstructions, allowing size determination.
Starting Page	1232
Ending Page	1236
File Size	605728
Page Count	5
File Format	PDF
ISBN	0780350219
ISSN	10823654
DOI	10.1109/NSSMIC.1998.774381
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-11-08
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image reconstruction Voltage control Optical imaging Imaging phantoms Spatial resolution Single photon emission computed tomography Collimators Cameras Data acquisition Noise level
Content Type	Text
Resource Type	Article

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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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