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Dynamic X-ray computed tomography
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DOI：10.1109/JPROC.2003.817868.png)
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Dynamic computed tomography (CT) imaging aims at reconstructing image sequences where the dynamic nature of the living human body is of primary interest. Main concerned applications are image-guided interventional procedures, functional studies and cardiac imaging. The introduction of ultra-fast rotating, gantries along with multi-row detectors and in near future area detectors allows a huge progress toward the imaging of moving organs with low-contrast resolution. This paper gives an overview of the different concepts:used in dynamic CT. A new reconstruction algorithm based on a voxel-specific dynamic evolution compensation is also presented., It provides four-dimensional image sequences with accurate spatio-temporal information, where each frame is reconstructed using a long-scan acquisition mode on several half-turns. In the same time, this technique permits to reduce the dose delivered per rotation while keeping the. same signal to noise ratio for every frame using an adaptive motion-compensated temporal averaging. Results are illustrated on simulated data.
Keyword:
cardiac imaging
computed tomography (CT)
CT fluoroscopy
dynamic CT
motion compensation
time evolution compensation
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