Table 1.
Percentage change in texture features when expanding the ROI by one voxel.
| AutoROI (%) | Manual (%) | Manual/AutoROI | |
|---|---|---|---|
| Autocorrelation | −40.8 | 4.59 | 0.112 |
| Cluster Prominence | −53.9 | 111 | 2.05 |
| Cluster shade | −8840 | 286 | −0.0323 |
| Contrast | −43.9 | 26.1 | −0.595 |
| Correlation | −5.91 | −5.31 | 0.898 |
| Difference entropy | −9.69 | 3.45 | −0.356 |
| Difference variance | −38.5 | 35.8 | −0.930 |
| Dissimilarity | −0.276 | 0.0886 | −0.321 |
| Energy | 57.8 | 30.3 | 0.525 |
| Entropy | −6.32 | 1.50 | −0.237 |
| Homogeneity | 38.8 | 3.53 | 0.0910 |
| Information measure of correlation 1 | −25.8 | −11.3 | 0.437 |
| Information measure of correlation 2 | −10.1 | −2.95 | 0.293 |
| Inverse difference | 25.1 | 1.13 | 0.0449 |
| Maximum probability | 0.422 | 25.5 | 60.5 |
| Sum average, μ x+y | −22.5 | −4.19 | 0.186 |
| Sum entropy | −8.18 | 0.386 | −0.0472 |
| Sum of squares | −48.2 | 17.6 | −0.366 |
| Sum variance | −49.3 | 15.4 | −0.312 |
The sensitivity of AutoROI and a manual level of 500 and 1500 mm2/s to the definition of the ROI for a patient with a tumor close to the left lateral ventricle, in the slice shown in Fig. 3.