Table 1.
Comparison of the mean spine and syrinx volumes for aligned spinal cord segments before and after operation, measured by each method. p-values for t-tests of the semiautomated programs compared to the manual Cavalieri method standard.
| Volumes (mm3) | ||||||||
|---|---|---|---|---|---|---|---|---|
| CAV Mean | CAV SD | SCAT Mean | SCAT SD |
p-Value CAV vs. SCAT |
3DQI Mean | 3DQI SD |
p-Value CAV vs. 3DQI |
|
| Pre-op Syrinx Volume | 4515 | 3720 | 4584 | 3825 | 0.891 | 4027 | 3805 | 0.117 |
| Post-op Syrinx Volume | 1109 | 1469 | 1064 | 1465 | 0.8200 | 819 | 1242 | 0.0019 * |
| Pre-Minus Post Syrinx Volume (p-value) |
3406 (0.0039 †) |
3520 (0.0065 †) |
3208 (0.00096 †) |
|||||
| Pre-op Spinal Cord Volume | 13,399 | 6212 | 11,325 | 5729 | 0.0051 * | 12,935 | 6213 | 0.533 |
| Post-op Spinal Cord Volume | 8722 | 3389 | 7340 | 3210 | 0.0001 * | 8279 | 3315 | 0.228 |
| Pre-Minus Post Spinal Cord Volume (p-value) |
4677 (0.0071 §) |
3985 (0.0035 §) |
4656 (0.0071 §) |
* Significant difference paired t-test. CAV vs. 3DQI method. † Significant difference, paired t-test: pre- vs. post-surgical syrinx volume. § Significant difference, paired t-test: pre- vs. post-surgical spinal cord volume.