Table 1.
Patient characteristics.
Table 2.
Tube voltage/tube current adjustment table based on BMI.
Figure 1.
Axial A-D of middle segment of the RCA are respectively scored as 4–1:
4, excellent, no artifacts; 3, good, mild artifacts; 2, acceptable, moderate artifacts, but can still make a diagnosis; and 1, cannot evaluate, severe artifacts, cannot make a diagnosis.
Table 3.
Coronary artery stenosis diagnosis accuracy in the premature beat group and the control group.
Table 4.
Coronary artery image quality scores.
Table 5.
Comparison of statistical results of variable parameters in the premature beat group and the control group.
Table 6.
Comparison of results from M-field scanning and S-field scanning in the premature beat group.
Figure 2.
A male patient, 58-years-old, with an image quality score of 4.
Figure A includes VR and CPR images, and Figure B includes an MIP image and a CPR straightened image used when measuring degree and range of luminal stenosis. The images show multiple soft plaques and calcified plaques at the right coronary and moderate stenosis at distal lumen (indicated by the superimposed arrow). Figure C is an example of coronary angiography, which demonstrates that it is in accordance with the results of CTCA. Figure D is an example of the ECG taken when data was acquired. Figure E show the ECG-edit later.
Figure 3.
Two patients with ventricular premature beats.
Figure A shows that heart rate is 71 bpm, 2-beat scanning is adopted, and acquisition is at 30–80% of R-R interval. A premature beat is encountered at the second beat during scanning. The scanning does not stop, and continuously scans the next R-R interval. Figure C shows the heart rate to be 55 bpm, 1-beat scanning is adopted, and acquisition at is 70–80% of R-R interval. Scanning is stopped immediately when a premature beat in encountered, and the scan is resumed at the next normal cardiac cycle. Figures B and D show the ECG-edit of A and C respectively.