TABLE 2

Comparison Between 4 Methods with CT-Reconstructed PET Images, with Respect to Correlation, PSNR, Regression Slopes, and R²

		Subject no.
Metric	Image type	1	2	3	4	5	Mean ± SD
Correlation	Dixon	0.994	0.993	0.992	0.990	0.994	0.993 ± 0.001
	UTE	0.994	0.994	0.995	0.991	0.994	0.993 ± 0.001
	Registration	0.954	0.982	0.964	0.997	0.875	0.954 ± 0.048
	GENESIS	0.996^*	0.995^*	0.996^*	0.998^*	0.997^*	0.996 ± 0.001^*
PSNR (dB)	Dixon	30.32	32.95	29.45	25.87	29.75	29.67 ± 2.53
	UTE	29.63	33.03	30.28	25.15	28.62	29.34 ± 2.86
	Registration	24.95	31.94	24.10	35.34	20.82	27.43 ± 5.99
	GENESIS	35.34^*	37.78^*	34.57^*	36.59^*	35.61^*	35.98 ± 1.24^*
Slope	Dixon	0.924	0.913	0.914	0.872	0.904	0.905 ± 0.020
	UTE	0.912	0.899	0.913	0.870	0.888	0.896 ± 0.018
	Registration	0.894	0.987	0.862	1.011	1.039	0.959 ± 0.077
	GENESIS	0.983^*	0.992^*	1.014^*	0.986	0.971^*	0.990 ± 0.016^*
R²	Dixon	0.972	0.973	0.979	0.962	0.967	0.971 ± 0.006
	UTE	0.974	0.967	0.982	0.945	0.971	0.968 ± 0.014
	Registration	0.889	0.956	0.914	0.987	0.744	0.898 ± 0.094
	GENESIS	0.992^*	0.989^*	0.994^*	0.993^*	0.985^*	0.991 ± 0.004^*

↵* Largest correlation, PSNR, R², and slope.