Size |
|
Volume (mm3) |
Volume of lesion |
Effective greatest dimension (mm) |
Greatest dimension of a sphere with the same volume as the lesion |
Surface area(mm2) |
Lesion surface area |
Maximum linear size(mm) |
Maximum distance between any two voxels in the lesion |
Shape |
|
Sphericity |
Similarity of the lesion shape to a sphere |
Irregularity |
Deviation of the lesion surface from the surface of a sphere |
Surface area-to-volume ratio(1/mm) |
Ratio of surface area to volume |
Morphology |
|
Margin sharpness |
Mean of the image gradient at the lesion margin |
Variance of margin sharpness |
Variance of the image gradient at the lesion margin |
Variance of radial gradient histogram |
Degree to which the enhancement structure extends in a radial pattern originating from the center of the lesion |
Enhancement texture |
|
Angular second moment(energy) |
Image homogeneity |
Contrast |
Location image variations |
Correlation |
Image linearity |
Entropy |
Randomness of the gray levels |
Sum of squares(variance) |
Spread in the gray-level distribution |
Difference entropy |
Randomness of the difference of neighboring voxels’ gray levels |
Difference variance |
Variations of difference of gray levels between voxel pairs |
Inverse difference moment |
Image homogeneity |
Sum average |
Overall brightness |
Sum entropy |
Randomness of the sum of gray levels of neighboring voxels |
Sum variance |
Spread in the sum of the gray levels of voxel-pair distribution |
Information measure of correlation 1 |
Nonlinear gray-level dependence |
Information measure of correlation 2 |
Nonlinear gray-level dependence |
Maximum correlation coefficient |
Nonlinear gray-level dependence |
Kinetic curve assessment |
|
Maximum enhancement |
Maximum contrast enhancement |
Time to peak(s) |
Time at which the maximum enhancement occurs |
Uptake rate(1/s) |
Uptake speed of the contrast enhancement |
Washout rate(1/s) |
Washout speed of the contrast enhancement |
Curve-shape index |
Difference between late and early enhancements |
Enhancement at first postcontrast time point |
Enhancement at first postcontrast time point |
Signal-to-enhancement ratio |
Ratio of the initial enhancement to the overall enhancement |
Volume of most enhancing voxels(mm3) |
Volume of the most enhancing voxels |
Total rate variation(1/s2) |
How rapidly the contrast will enter and exit from the lesion |
Normalized total rate variation(1/s2) |
How rapidly the contrast will enter and exit from the lesion |
Enhancement-variance kinetics |
|
Maximum variance of enhancement |
Maximum spatial variance of contrast enhancement over time |
Time to peak at maximum variance(s) |
Time at which the maximum variance occurs |
Enhancement-variance increasing rate(1/s) |
Rate of increase of the enhancement variance during uptake |
Enhancement-variance decreasing rate(1/s) |
Rate of decrease of the enhancement variance during washout |