Motion-correlated spiral CT scanning of the lung and mediastinal vessels with cone correction

Herbert K. Bruder; Karl Stierstorfer; Thomas Flohr

doi:10.1117/12.533427

12 May 2004 Motion-correlated spiral CT scanning of the lung and mediastinal vessels with cone correction

Herbert K. Bruder, Karl Stierstorfer, Thomas Flohr

Author Affiliations +

Proceedings Volume 5370, Medical Imaging 2004: Image Processing; (2004) https://doi.org/10.1117/12.533427
Event: Medical Imaging 2004, 2004, San Diego, California, United States

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.

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Herbert K. Bruder, Karl Stierstorfer, and Thomas Flohr "Motion-correlated spiral CT scanning of the lung and mediastinal vessels with cone correction", Proc. SPIE 5370, Medical Imaging 2004: Image Processing, (12 May 2004); https://doi.org/10.1117/12.533427

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KEYWORDS

Heart

Electrocardiography

Sensors

Lung

Computed tomography

Data acquisition

Motion detection

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