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Optimal Systolic and Diastolic Reconstruction Windows for Coronary CT Angiography Using Dual-Source CT

¹ Department of Clinical Radiology, University of Muenster, Albert-Schweitzer-Strasse 33, 8149 Muenster, Germany.
² Department of Cardiology, University of Muenster, Muenster, Germany.

View larger version (12K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1 —Bar graph shows distribution of optimal reconstruction interval for right coronary artery (black bars), left anterior descending artery (gray bars), and left circumflex artery (white bars). In most patients, optimal systolic reconstruction window is at 30% or 35%.

View larger version (11K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2 —Bar graph shows distribution of optimal diastolic reconstruction interval for right coronary artery (black bars), left anterior descending artery (gray bars), and left circumflex artery (white bars). Optimal diastolic reconstruction window is at 70% or 75%.

View larger version (9K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 3 —Position of mean optimal reconstruction window in relation to heart rate in beats per minute (bpm). Note that in patients with high heart rates, position of optimal reconstruction interval shifts toward higher values due to shortening of diastole (•). = systole.

View larger version (156K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4A —Volume-rendered images of 75-year-old man with atypical chest pain presenting with mean heart rate of 75 beats per minute. Both systolic (40% of R-R interval) (A) and diastolic (75% of R-R interval) (B) reconstructions show right coronary artery and its branches without motion artifacts.

View larger version (155K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 4B —Volume-rendered images of 75-year-old man with atypical chest pain presenting with mean heart rate of 75 beats per minute. Both systolic (40% of R-R interval) (A) and diastolic (75% of R-R interval) (B) reconstructions show right coronary artery and its branches without motion artifacts.

View larger version (146K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5A —Volume-rendered images of 74-year-old woman presenting with heart rate of 92 beats per minute. Systolic reconstruction (45% of R-R interval) (A) and diastolic reconstruction (90% of R-R-interval) (B) are presented. Note that small right coronary artery is depicted without motion artifacts only in systolic reconstruction. In diastolic reconstruction, severe motion artifacts are present; this phase was graded as nondiagnostic (image quality score = 5).

View larger version (148K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 5B —Volume-rendered images of 74-year-old woman presenting with heart rate of 92 beats per minute. Systolic reconstruction (45% of R-R interval) (A) and diastolic reconstruction (90% of R-R-interval) (B) are presented. Note that small right coronary artery is depicted without motion artifacts only in systolic reconstruction. In diastolic reconstruction, severe motion artifacts are present; this phase was graded as nondiagnostic (image quality score = 5).

View larger version (10K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6A —Scatterplots of motion scores in relation to heart rate in beats per minute (bpm). Note that scores in systolic (A) reconstructions remain fairly constant as heart rate increases, whereas scores in diastolic (B) reconstructions deteriorate rapidly. Middle lines show linear regression, and upper and lower lines show 95% confidence interval.

View larger version (10K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6B —Scatterplots of motion scores in relation to heart rate in beats per minute (bpm). Note that scores in systolic (A) reconstructions remain fairly constant as heart rate increases, whereas scores in diastolic (B) reconstructions deteriorate rapidly. Middle lines show linear regression, and upper and lower lines show 95% confidence interval.

View larger version (10K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 6C —Scatterplots of motion scores in relation to heart rate in beats per minute (bpm). Fusion of data shown in A and B. Note that lines representing calculated linear regressions for motion score in systolic (solid line) and diastolic (dashed line) reconstructions cross each other at 80 bpm. = data for systolic reconstructions, = data for diastolic reconstructions.

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