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Reproducibility of calcium measurements using EBCT with incremental
scanning technique has been reported to be unsatisfactory using the
traditional Agatston-Score. This score suffers from partial volume
effects, which can influence the scoring result considerably.
Overlapping image reconstruction, which is possible with a spiral
CT scanning technique, reduces partial volume effects and yields a
much better reproducibility of calcium measurements in repeat
examinations. The variability of the Agatston-Score has been
reduced to 10 % in a first pilot examination. Even better results
were obtained using a volumetric scoring approach. The variability
of 7 % is below the reported annual progression rate.
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3D volume rendering of a coronary CT angiography using a multislice spiral
scanner. A high grade stenosis in the proximal LAD is clearly depicted.
The coronary angiogram on the right shows the corresponding lesion.
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Axial images from a multislice spiral CT study. A non-calcified plaque is
depicted in the proximal LAD (arrows). Additional non-calcified lesions are
found in the distal LAD (right images. The magnification view is shown in
the small picture.
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Multislice spiral CT angiography in a patient with elevated global coronary
risk. A plaque containing calcified and non-calcified material is seen in
the LAD at the origin of the first diagonal branch. The right image shows a
multiplanar reformation of the proximal rCX. Here a small non-calcified
lesion is depicted (arrow).
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