Quantification of Coronary Artery Calcium Using Multidetector CT and a Retrospective ECG-Gating Reconstruction Algorithm
Jun Horiguchi1,
Tadashi Nakanishi2 and
Katsuhide Ito1
1
Department of Radiology, Hiroshima University School of Medicine, 1-2-3,
Kasumi-cho, Minami-ku, Hiroshima, 734-8551, Japan
2
Department of Radiology, Mazda Hospital, 2-15, Aosakiminami, Huchu-cho,
Aki-gun, Hiroshima, 735-0017, Japan.
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Fig. 1. —Drawing shows method of ECG-gated data acquisition on
multisector reconstructions. Images of arbitrary phase of cardiac cycles can
be reconstructed with retrospective ECG-gated technique. Note that diastolic
data (sectors) have been collected from four consecutive cardiac cycles.
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Fig. 2. —Graph shows that temporal resolution of multisector varies
according to heart rate. Here, temporal resolution values of multisector
reconstruction are shown at gantry rotation speeds of 0.8 and 1.0 sec per
rotation. bpm = beats per minute.
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Fig. 3. —CT scan of 38-year-old healthy male volunteer shows peak CT
value measurement in course of coronary artery. For all 55 coronary arteries
without calcified deposits, we extracted most peripherally possible pixels
encompassing left main artery, left anterior descending artery, and
pericoronary fat tissue on workstation and then gathered them into voxel. Then
we measured peak CT value in voxel.
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Fig. 4. —Scatterplot shows total calcium scores derived using electron
beam CT and multidetector CT with single-sector reconstruction with threshold
of 90 H. Total calcium scores were obtained using modified Agatston method for
multidetector CT. Note calcium scores show low agreement in high scores.
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Fig. 5. —Scatterplot shows total calcium scores using electron beam CT
and multidetector CT with singlesector reconstruction with threshold of 130 H.
Total calcium scores were obtained using Agatston method for both CT
techniques.
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Fig. 6. —Scatterplot shows total calcium scores using electron beam CT
and multidetector CT with multisector reconstruction with threshold of 90 H.
Note calcium scores show high correlation with wide range of scores.
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Fig. 7. —Scatterplot shows total calcium scores using electron beam CT
and multidetector CT with multisector reconstruction with threshold of 130 H.
Note calcium scores show high correlation with wide range of scores.
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Fig. 8A. —40-year-old obese man with coronary artery calcification
(heart rate = 41 beats per minute). Axial electron beam CT scan reveals
calcified deposits that are obscured by marked interference of streaking
artifacts.
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Fig. 8B. —40-year-old obese man with coronary artery calcification
(heart rate = 41 beats per minute). Multisector reconstruction of axial
multidetector CT scan (temporal resolution, 137 msec) shows calcification of
right coronary artery.
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Fig. 9A. —57-year-old man with coronary artery calcification (heart
rate = 74 beats per minute). Axial electron beam CT scan shows arc-shaped
artifact from calcification of right coronary artery.
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Fig. 9B. —57-year-old man with coronary artery calcification (heart
rate = 74 beats per minute). Multisector reconstruction of axial multidetector
CT scan (temporal resolution, 500 msec) shows artifacts from calcification are
more pronounced.
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Copyright © 2001 by the American Roentgen Ray Society.
