|
HR before β-blocker, min-1
|
72.9 ± 7.3
|
72.5 ± 7.7
|
0.64
|
|
Average HR during the main scan, min-1
|
64.1 ± 7.4
|
61.6 ± 8.0
|
<0.001
|
|
Range of HR during the main scan, min-1
|
5.9 ± 14.3
|
4.4 ± 10.1
|
0.19
|
|
Decrease of HR, min-1
|
8.8 ± 5.7
|
11.0 ± 7.2
|
<0.001
|
|
Time between β-blocker administration and main scan, min
|
4.0 ± 0.6
|
90.5 ± 16.0
|
<0.001
|
|
Helical pitch
| | |
<0.001
|
|
Step and shoot
|
0 (0.0%)
|
5 (1.8%)
| |
|
0.16
|
138 (73.4%)
|
141 (50.9%)
| |
|
0.18
|
12 (6.4%)
|
26 (9.4%)
| |
|
0.2
|
0 (0.0%)
|
3 (1.1%)
| |
|
0.22
|
4 (2.1%)
|
22 (7.9%)
| |
|
0.24
|
34 (18.1%)
|
80 (28.9%)
| |
|
No. of sectors used
| | |
<0.001
|
|
1
|
61 (32.5%)
|
141 (50.9%)
| |
|
2
|
119 (63.3%)
|
125 (45.1%)
| |
|
3
|
8 (4.4%)
|
11 (4.0%)
| |
|
Total exposure, DLP
|
1450 ± 335
|
1343 ± 402
|
0.003
|
|
Main scan duration, sec
|
6.8 ± 1.1
|
6.4 ± 1.3
|
<0.001
|
|
Premature beats during the main scan
|
16 (8.5%)
|
15 (5.4%)
|
0.19
|
|
Failure at breathholding
|
3 (1.6%)
|
9 (3.2%)
|
0.27
|
|
Presence of coronary artery plaque
|
106 (56.3%)
|
156 (56.3%)
|
0.99
|
|
Presence of calcification
|
139 (73.9%)
|
199 (71.8%)
|
0.62
|
|
Maximum image quality score per patient
| | |
0.91
|
|
1
|
55 (29.3%)
|
88 (31.8%)
| |
|
2
|
42 (22.3%)
|
63 (22.7%)
| |
|
3
|
44 (23.4%)
|
64 (23.1%)
| |
|
4
|
29 (15.4%)
|
42 (15.2%)
| |
|
5
|
18 (9.6%)
|
20 (7.2%)
| |
|
Image quality score per vessel
| | | |
|
RCA
| | |
0.86
|
|
1
|
67 (35.6%)
|
106 (38.3%)
| |
|
2
|
40 (21.3%)
|
66 (23.8%)
| |
|
3
|
38 (20.2%)
|
50 (18.1%)
| |
|
4
|
31 (16.5%)
|
40 (14.4%)
| |
|
5
|
12 (6.4%)
|
15 (5.4%)
| |
|
LAD
| | |
0.70
|
|
1
|
87 (46.3%)
|
132 (47.7%)
| |
|
2
|
42 (22.3%)
|
72 (26.0%)
| |
|
3
|
38 (20.2%)
|
45 (16.2%)
| |
|
4
|
16 (8.5%)
|
19 (6.9%)
| |
|
5
|
5 (2.7%)
|
9 (3.2%)
| |
|
LCX
| | |
0.32
|
|
1
|
82 (43.6%)
|
129 (46.6%)
| |
|
2
|
44 (23.4%)
|
69 (24.9%)
| |
|
3
|
31 (16.5%)
|
49 (17.7%)
| |
|
4
|
24 (12.8%)
|
19 (6.9%)
| |
|
5
|
7 (3.7%)
|
11 (4.0%)
| |
