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

Kjell Erlandsson*, Margarita Núñez, Declan Kruppa, Brian F. Hutton

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    4 Citations (Scopus)

    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 beltsystem. 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.

    Original languageEnglish
    Title of host publication2008 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2008
    Pages3775-3778
    Number of pages4
    DOIs
    Publication statusPublished - 2008
    Event2008 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2008 - Dresden, Germany
    Duration: 19 Oct 200825 Oct 2008

    Other

    Other2008 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2008
    CountryGermany
    CityDresden
    Period19/10/0825/10/08

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