Centre 1 (n = 36) | Centre 2 (n = 26) | Centre 3 (n = 7) | |
---|---|---|---|
Type of scanner (number of slices) | |||
Siemens Somatom Force (2 × 192) | 6 (17%) | – | – |
Siemens Somatom Drive (2 × 128) | 2 (6%) | – | – |
Siemens Somatom Definition Flash (2 × 128) | 16 (44%) | – | – |
Siemens Somatom Definition AS+ (2 × 64) | 8 (22%) | – | – |
Siemens Sensation 64 (64) | 2 (6%) | – | 6 (86%) |
Siemens Sensation 16 (16) | 2 (6%) | – | – |
Philips Brilliance iCT (2 × 128) | – | 25 (96%) | 1 (14%) |
Philips Brilliance 16 (16) | – | 1 (4%) | – |
Total | 36 (100%) | 26 (100%) | 7 (100%) |
ECG gating | 18 (50%) | 21 (%) | – |
Heart rate (bpm) | 79±29 | 76±21 | – |
Tube current (mA) | 198±126 | 176±66 | 80±33 |
Tube peak voltage (kVp) | |||
70 | 3 (8%) | – | – |
80 | 3 (8%) | 8 (%) | 1 (14%) |
90 | 3 (8%) | 1 (%) | – |
100 | 9 (25%) | 11 (%) | 5 (71%) |
120 | 17 (47%) | 6 (%) | 1(14%) |
140 | 1 (3%) | – | – |
Total | 36 (100%) | 26 (100%) | 7 (100%) |
Volume CT dose index (mGy) | 5.5±5.2 | 8±5 | 3.8±3 |
Dose length product (mGy × cm) | 190±178 | 255±277 | 132±96 |
Slice thickness | |||
0.8 | 8 (22%) | – | 5 (71%) |
0.9 | – | 12 (50%) | 1 (14%) |
1 | 26 (72%) | 2 (77%) | 1 (14%) |
1.5 | – | 12 | – |
2 | 2 (6%) | – | – |
Total | 36 (100%) | 26 (100%) | 7 (100%) |
Kernel | |||
B20f | 7 | – | – |
B26f | 3 | – | – |
B31f | 4 | – | – |
B40f | – | – | 5 |
B46f | 1 | – | – |
Bv40d | 6 | – | – |
I26f | 16 | – | – |
A | – | 8 | |
B | – | 6 | 1 |
C | – | 1 | – |
CB | – | 2 | – |
XCA | – | 4 | – |
XCC | – | 5 | – |
Total | 36 (100%) | 26 (100%) | 7 (100%) |