NDLI: Physiological gating of the MARS spectral micro CT scanner

Content Provider	IEEE Xplore Digital Library
Author	Glass, I. Butler, A.P.H. Butler, P.H. Bones, P.J. Weddell, S.J.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Univ. of Canterbury, Christchurch, New Zealand (Glass, I.; Butler, A.P.H.; Bones, P.J.; Weddell, S.J.) \|\| Dept. of Phys. & Astron., Univ. of Canterbury, Christchurch, New Zealand (Butler, P.H.)
Abstract	Two methods of physiological gating, prospective and retrospective, have been investigated for the Medipix All-Resolution Systems (MARS) spectral CT scanner in order to reduce image blurring due to cardiovascular motion. The scanner is currently designed for scanning small animals, however there are plans to extend it to clinical applications in future. Prospective gating has been implemented such that projection data is collected at specific times, dependent on the state of the heart and lungs. The alternative approach of retrospective gating allows the scanner to collect projections as fast as possible, but records the state of the heart and lungs at each acquisition. In order to validate the effectiveness of the gating, a heart and lungs phantom operated by means of a pneumatic system was built. The phantom was created by laying liquid latex over a 3D printed former and proved successful at simulating rhythmical motion. A marker attached to the “heart” outer surface was used to assess how consistently projection acquisitions could be obtained. Preliminary results for prospective gating with the phantom show some success. The standard deviation of marker Euclidean distance ranged between 45.0 μm and 116.0 μm for cardiac rates of 60, 200 and 320 bpm. Investigation indicated that there was significant variation in the time between the trigger signal from the gating detection system and the data acquisition. Further development will be required to reduce this variation.
Sponsorship	IEEE New Zealand Central Sect.
Starting Page	317
Ending Page	322
File Size	1009433
Page Count	6
File Format	PDF
ISSN	21512191
e-ISBN	9781479908837
DOI	10.1109/IVCNZ.2013.6727036
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-11-27
Publisher Place	New Zealand
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heart Mars prospective gating Animals Computed tomography Phantoms proximity analysis retrospective gating gated CT motion artefact correction motion cardiorespiratory phantom Biomedical monitoring
Content Type	Text
Resource Type	Article

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