Table 2 CT characteristics in paediatric and adult cases
Paediatric cases (n = 35) | Adult cases (n = 34) | |
|---|---|---|
Time between implantation and CT | ||
< 1 month | 12 (32%) | 28 (82%) |
1 month – 1 year | 15 (41%) | 3 (9%) |
> 1 year | 10 (27%) | 3 (9%) |
ECG gating | 19 (54%) | 20 (59%) |
Heart rate (bpm) | 82±28 | 73±21 |
Tube current (mA) | 135±75 | 219±114 |
Tube peak voltage (kVp) | ||
70 | 3 (9%) | 0 (0%) |
80 | 10 (29%) | 2 (6%) |
90 | 2 (6%) | 2 (6%) |
100 | 15 (43%) | 10 (29%) |
120 | 5 (14%) | 19 (56%) |
140 | 0 (0%) | 1 (3%) |
Volume CT dose index (mGy) | 4.9±3.8 | 7.7±6.0 |
Dose length product (mGy × cm) | 128±128 | 292±266 |
Slice thickness ≤ 1 mm | 28 (80%) | 27 (79%) |
Type of scanner | ||
16-slice | 1 (3%) | 2 (6%) |
64-slice | 5 (14%) | 3 (9%) |
> 64 slice | 29 (83%) | 29 (85%) |