Scales for structural identification
4 Excellent: Perfectly demarcated contour and very good contrast with surrounding structure
3 Good: Almost good contour, but partially (<50%) mixed with the background
2 Fair: Organ/node can be discriminated from surrounding structures, while more than half of the contour is mixed with the background
1 Faint: Structures of organ/nodes are ill-defined, but can be identified by faint contrast with surrounding structures
0 Unidentifiable: Cannot identify any structures
Scales for geometric distortion Scales for geometric distortion
4 High geometric accuracy and almost no distortion
3 Faint distortion: Organ/node slightly tilts, but its convexity is almost the same as that of T2-weighted turbo spin-echo sequence (TSE) image
2 Moderate distortion: Convexity is less pronounced or lost compared to that of a T2-weighted TSE image
1 Intense distortion: Convexity is opposite compared to that of a T2-weighted TSE image, or severe dislocation exists
0 Impossible to evaluate, or unidentifiable