|
HR before β-blocker, min-1
|
80.3 ± 4.3
|
79.7 ± 4.1
|
0.42
|
|
Average HR during the main scan, min-1
|
69.0 ± 6.9
|
67.2 ± 6.9
|
0.10
|
|
Range of HR during the main scan, min-1
|
5.3 ± 12.2
|
5.9 ± 14.9
|
0.77
|
|
Decrease at HR, min-1
|
11.2 ± 6.0
|
12.5 ± 6.1
|
0.18
|
|
Time between β-blocker administration and main scan, min
|
4.1 ± 0.66
|
3.7 ± 0.80
|
< 0.001
|
|
Helical pitch
| | |
0.69
|
|
Step and shoot
|
0 (0.0%)
|
0 (0.0%)
| |
|
0.16
|
72 (93.5%)
|
86 (93.5%)
| |
|
0.18
|
3 (3.9%)
|
5 (5.4%)
| |
|
0.2
|
0 (0.0%)
|
0 (0.0%)
| |
|
0.22
|
0 (0.0%)
|
0 (0.0%)
| |
|
0.24
|
2 (2.6%)
|
1 (1.1%)
| |
|
No. of sectors used
| | |
0.27
|
|
1
|
10 (13.0%)
|
6 (6.5%)
| |
|
2
|
59 (76.6%)
|
79 (85.9%)
| |
|
3
|
8 (10.4%)
|
7 (7.6%)
| |
|
Total exposure, DLP
|
1582 ± 212
|
1594 ± 232
|
0.74
|
|
Main scan duration, sec
|
7.2 ± 0.63
|
7.5 ± 0.97
|
0.01
|
|
Premature beats during the main scan
|
6 (7.8%)
|
6 (6.5%)
|
0.75
|
|
Failure at breathholding
|
1 (1.3%)
|
2 (2.2%)
|
0.67
|
|
Presence of coronary artery plaque
|
32 (41.6%)
|
51 (55.4%)
|
0.07
|
|
Presence of calcification
|
53 (68.3%)
|
73 (79.4%)
|
0.12
|
|
Maximum image quality score per patient
| | |
0.02
|
|
1
|
15 (19.5%)
|
21 (22.8%)
| |
|
2
|
14 (18.2%)
|
28 (30.4%)
| |
|
3
|
16 (20.8%)
|
23 (25.0%)
| |
|
4
|
17 (22.1%)
|
13 (14.1%)
| |
|
5
|
15 (19.5%)
|
7 (7.6%)
| |
|
Image quality score per vessel
| | | |
|
RCA
| | |
0.005
|
|
1
|
19 (24.7%)
|
30 (32.6%)
| |
|
2
|
11 (14.3%)
|
26 (28.3%)
| |
|
3
|
16 (20.8%)
|
20 (21.7%)
| |
|
4
|
21 (27.3%)
|
10 (10.9%)
| |
|
5
|
10 (13.0%)
|
6 (6.5%)
| |
|
LAD
| | |
0.054
|
|
1
|
29 (37.7%)
|
39 (42.4%)
| |
|
2
|
13 (16.9%)
|
32 (34.8%)
| |
|
3
|
19 (24.7%)
|
11 (12.0%)
| |
|
4
|
13 (16.9%)
|
8 (8.7%)
| |
|
5
|
3 (3.9%)
|
2 (2.2%)
| |
|
LCX
| | |
0.02
|
|
1
|
29 (37.7%)
|
44 (47.8%)
| |
|
2
|
12 (15.6%)
|
20 (21.7%)
| |
|
3
|
10 (13.0%)
|
17 (18.5%)
| |
|
4
|
19 (24.7%)
|
8 (8.7%)
| |
|
5
|
7 (9.1%)
|
3 (3.3%)
| |
