Special ReportAdvances in Cardiac Imaging with 16-Section CT Systems
Section snippets
System Properties and Detector Design
Until 2001, 0.5-second gantry rotation was the limit for commercially available CT systems. The CT scanner we evaluated for cardiac applications additionally offers 0.42-second gantry rotation to improve the temporal resolution of images. Like some commonly used four-section CT systems (23), this scanner has an adaptive array detector, which consists of 24 detector rows. The 16 central rows define a 0.75-mm collimated section width in the center of rotation, and the four outer rows on both
Image Quality and Artifacts
Recent publications (21, 30) have demonstrated that consideration of the cone-beam geometry becomes mandatory for general-purpose CT scanning with eight or more sections to avoid severe cone-beam artifacts. The question of cone correction also arises for cardiac CT with eight or more sections. Established ECG-gated multisection spiral reconstruction methods for four-section CT systems, such as the ACV algorithm, disregard the cone angle of the measurement rays: The rays are treated as if they
Discussion
In conclusion, the results of our patient studies support the use of 1-mm sections and medium-smooth kernels for initial clinical evaluation and as an input for three-dimensional volume rendering. A combination of 0.75-mm sections and sharp kernels should be used to depict severely calcified coronary branches or coronary stents. We achieved considerably improved visualization of calcified and noncalcified plaques and of stents with use of submillimeter section widths and optimized in-plane
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