Table 6 CT scan characteristics for lumbar spine CT among 100 patients in 7 selected facilities
Facility | A (n = 25) | B (n = 23) | C (n = 5) | D (n = 21) | F (n = 24) | G (n = 2) | Total (N = 100) |
|---|---|---|---|---|---|---|---|
kVp n (%) | |||||||
120 | 2 (100.0) | 2 (2.0) | |||||
130 | 25 (100.0) | 23 (100.0) | 5 (100.0) | 21 (100.0) | 24 (100.0) | 98 (98.0) | |
Total mAs | 2787 (1919, 3254)** | 5147 (3802, 6140)** | 5112 (4158, 5112)** | 8389 (8037, 8863)** | 6004 (5239, 8987)** | 5599.5 (3277, 8083)** | |
Exam mAs | 174 (134, 207)** | 182 (0) | 118 (20.9) | 115 (21.9) | 135 (107, 165.5) | 277.5 (27.6) | 157.9 (57.6) |
Reference mAs | 250 (250, 250)** | 132 (115, 208)** | 190 (0) | 131 (28.5) | 195.9 (42.1) | 191.3 (52.8) | |
Scan length (mm) | 381 (345, 444)** | 333 (40.6) | 387.7 (37.7) | 302.3 (50.7) | 397.2 (78.0) | 90.3 (0) | 348 (304.5, 407)** |
Scan time (s) | 20.7 (4.0) | 25.8 (0) | 71.7 (16.1) | 56.4 (2.5) | 66.3 (11.5) | 51.5 (41.7) | 54 (21.8, 59)** |
Slice thickness (mm) n (%) | |||||||
1.25 | 2 (100.0) | 2 (2.2) | |||||
1.5 | 14 (100.0) | 14 (15.4) | |||||
3 | 25 (100.0) | 5 (100.0) | 21 (100.0) | 24 (100.0) | 75 (82.4) | ||
Image quality n (%) | |||||||
3 | 1 (4.0) | 1 (4.4) | 7 (33.3) | 1 (4.2) | 10 (10.0) | ||
4 | 3 (12.0) | 10 (43.5) | 1 (20 .0) | 11 (52.4) | 3 (12.5) | 2 (100.0) | 30 (30.0) |
5 | 21 (84.0) | 12 (52.1) | 4 (80.0) | 3 (14.3) | 20 (83.3) | 60 (60.0) | |