Table 4.
Comparison of visualization of the three concentric zones on intraoperative images obtained with head and body coils.
| 2ch-FUS | Body-RF | 8ch-HEAD |
p Value 2ch-FUS vs Body-RF |
p Value 2ch-FUS vs 8ch-HEAD |
k Value (95% CI) | |
|---|---|---|---|---|---|---|
| Zone I | ||||||
| Present | 0.82 (0.59, 1.00) |
|||||
| Reader 1 | 6 (75.0) | 0 (0) | 8 (100) | 0.031 | 0.500 | |
| Reader 2 | 8 (100) | 0 (0) | 8 (100) | 0.008 | 1.000 | |
| Zone II | ||||||
| Present | 0.90 (0.71, 1.00) |
|||||
| Reader 1 | 8 (100) | 1 (12.5) | 8 (100) | 0.016 | 1.00 | |
| Reader 2 | 8 (100) | 0 (0) | 8 (100) | 0.008 | 1.00 | |
| Zone III | ||||||
| Present | 0.91 (0.75, 1.00) |
|||||
| Reader 1 | 3 (37.5) | 2 (25.0) | 8 (100) | 1.000 | 0.063 | |
| Reader 2 | 3 (37.5) | 3 (37.5) | 8 (100) | 1.000 | 0.063 |
Categorical variables (Zone I, II, III) are expressed as numbers and percentages in parenthesis and they were compared using the McNemar Test. Inter-reader agreement was assessed using the Cohen’s kappa (k) test with 95% confidence intervals (95% CI). Statistically significant values (p < 0.05) are highlighted in bold. Abbreviations: 2ch-FUS: Two-channel FUS-Head Coil; Body-RF: Body Radiofrequency Coil; 8ch-HEAD: Eight-channel phased-array head Coil.