Diagnostic Ability of Multislice CT, V/Q SPECT, and Planar V/Q Scintigraphy to Detect Pulmonary Embolism (n = 83)
| Parameter | CT | V/Q SPECT | V/Q planar |
|---|---|---|---|
| True-positive | 32 | 36 | 28 |
| True-negative | 45 | 42 | 39 |
| False-positive | 1 | 4 | 7 |
| False-negative | 5 | 1 | 9 |
| Σ | 83 | 83 | 83 |
| Sensitivity | 0.86 | 0.97 | 0.76 |
| Specificity | 0.98 | 0.91 | 0.85 |
| NPV | 0.90 | 0.98 | 0.81 |
| PPV | 0.97 | 0.90 | 0.80 |
| Accuracy | 0.93 | 0.94 | 0.81 |
NPV = negative predictive value; PPV = positive predictive value.
All mismatch defects of V/Q scintigraphy were assessed as embolisms.