Table 2:
Group comparisons between selected CT-acquisition parameters for patients receiving CT-guided spinal injections in 2009 and 2010a
| Parameter | Anatomy | 2009 | 2010 | T Test P Value |
|---|---|---|---|---|
| Minimum guide-phase tube current (mA) | All studies | 75.0 ± 61.2 | 13.4 ± 7.3 | <.001 |
| Cervical only | 104.0 ± 68.2 | 16.7 ± 11.2 | <.001 | |
| Lumbar only | 37.7 ± 29.0 | 11.7 ± 4.9 | <.001 | |
| Total image seriesb | All studies | 12.3 ± 5.8 | 9.7 ± 5.4 | .022 |
| Cervical only | 14.0 ± 6.1 | 10.9 ± 4.6 | .178 | |
| Lumbar only | 10.8 ± 3.3 | 9.3 ± 4.9 | .269 | |
| Survey scan length (mm) | All studies | 100.4 ± 36.4 | 94.5 ± 38.9 | .436 |
| Cervical only | 90.9 ± 56.6 | 56.6 ± 20.3 | .088 | |
| Lumbar only | 108.0 ± 103.0 | 103.0 ± 40.0 | .816 |
a
Mean ± SD.
b
Note, only 1 series each was assigned to the survey and contrast phases of the procedure; the remainder was during the guide phase.