Table 7.

Accuracy of ASHS segmentation relative to manual segmentation, measured in terms of symmetric root mean squared surface distance [Gerig et al., 2001], as opposed to Dice similarity coefficient, which measures volumetric overlap

Metric	CA1	CA2	CA3	CA	DG	SUB	ERC	BA35	BA36	PRC	HIPP
Symmetric RMS surface distance (mm)Smaller = Better	0.529	0.670	0.856	0.505	0.560	0.511	0.675	0.799	0.859	0.790	0.480
Relative volume overlap (DSC) Larger = Better	0.803	0.552	0.525	0.797	0.823	0.750	0.786	0.702	0.777	0.797	0.893

Smaller or thinner structures, such as CA2 and SUB, tend do have lower Dice coefficient than larger or thicker structures with similar distance errors.