CT-free quantitative SPECT for automatic evaluation of %thyroid uptake based on deep-learning

EJNMMI Physics

Table 5 The external verification of CT-free SPECT versus SPECT/CT (n = 29 salivary gland SPECT/CT)

Metric	μ-map generation			Thyroid segmentation			Total SPECT counts			Thyroid-specific SPECT counts
Metric	R²	MSE^c (× 10⁻⁴)	%NMAE^d	DSC^e	VD^f (mL)	95% HD^g (mm)	R²	MSE (× 10⁻⁴)	%NMAE	R²	MSE (× 10⁻⁴)	%NMAE (× 10⁻³)
Mean	0.942	1.875	1.834	0.657	7.480	13.514	0.983	0.066	0.044	0.992	0.010	0.778
STD^a	0.020	0.621	0.614	0.088	7.383	7.213	0.010	0.035	0.025	0.019	0.030	0.615
SER^b	0.004	0.113	0.112	0.016	1.348	1.317	0.002	0.006	0.005	0.003	0.005	0.112