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Proceedings Paper

Motion-correlated spiral CT scanning of the lung and mediastinal vessels with cone correction
Author(s): Herbert K. Bruder; Karl Stierstorfer; Thomas Flohr
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Paper Abstract

In thoracic spiral CT-imaging of pericardial lung areas high spatial resolution is a prerequisite for efficient diagnosis. However, due to cardiac motion pulsation artefacts arising from the beating heart might affect images of pericardial lung areas and mediastinal vessels. We developed a gated thoracic imaging technique to avoid these pulsation artefacts. The temporal correlation to the stream of projection data can be provided either by the ECG of the patient or by the Cardiac Motion Function which can be computed directly from CT raw data. Due to multi-slice detector technology the conical shape of projection data has to be taken into account. This is achieved using stacks (booklets) of double-oblique reconstruction planes (pages) at different positions of the spiral path. The slope of the pages is adapted to the spiral geometry and optimized for utilization of almost all of the detector data. Only those booklets are contributing to final image slices that are related to the diastolic phase of the beating heart. Volume coverage of half the detector height per rotation can be achieved. Using the leading-edge 16-slice detector technology with 0.4s gantry rotation the entire thorax can be scanned with 0.75mm sampling within less than 25s. It will be shown, that the Cardiac Motion Function can be used as an adequate substitute for the ECG of the patient. In addition it is shown, that pericardial lung areas are depicted much sharper using gated reconstruction and that motion artefacts in mediastinal vessels are effectively suppressed.

Paper Details

Date Published: 12 May 2004
PDF: 12 pages
Proc. SPIE 5370, Medical Imaging 2004: Image Processing, (12 May 2004); doi: 10.1117/12.533427
Show Author Affiliations
Herbert K. Bruder, Siemens Medical Solutions (Germany)
Karl Stierstorfer, Siemens Medical Solutions (Germany)
Thomas Flohr, Siemens Medical Solutions (Germany)

Published in SPIE Proceedings Vol. 5370:
Medical Imaging 2004: Image Processing
J. Michael Fitzpatrick; Milan Sonka, Editor(s)

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