NDLI: Reduction of CT artifacts due to respiratory motion in a slowly rotating SPECT/CT

Content Provider	IEEE Xplore Digital Library
Author	Erlandsson, Kjell Nunez, Margarita Kruppa, Declan Hutton, Brian F.
Copyright Year	2008
Description	Author affiliation: Institute of Nuclear Medicine, University College London, UK (Erlandsson, Kjell; Nunez, Margarita; Kruppa, Declan; Hutton, Brian F.)
Abstract	The GE Hawkeye-4 is a low-dose CT system mounted on the gantry of a SPECT scanner. With a scanning time of 23 s per full rotation, which corresponds to 4–5 normal breathing cycles, respiratory motion may induce image artifacts in thorax studies. We have developed a method to reduce these artifacts by correcting for the axial component of the respiratory motion, utilizing respiratory phase information concerning the breathing pattern, obtained by the use of a pneumatic belt-system. The method is based on segmentation of the projection data into subsets corresponding to different motion-amplitudes, followed by generation of low quality, but motion-free image estimates. The method has been tested with simulations based on a digital phantom and also with simulations based on real CT data. Our results show that significant reduction in artifacts can be achieved by correcting for the axial component of the respiratory motion. In conclusion, this is a promising method for reduction of respiratory motion artifacts in a slowly rotating SPECT/CT system.
Starting Page	3775
Ending Page	3778
File Size	9358015
Page Count	4
File Format	PDF
ISBN	9781424427147
ISSN	10957863
DOI	10.1109/NSSMIC.2008.4774279
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-19
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Computed tomography Motion estimation Imaging phantoms Image reconstruction Nuclear and plasma sciences Thorax Image segmentation Testing Timing Manufacturing
Content Type	Text
Resource Type	Article

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