Table 1.

Quantitative comparison of RMSE and PSNR (dB) in CBF maps at low-dose are reports using cTSVD, KSVD-SPD and our proposed method. The average value for the patients with CTP deficits, with normal CTP maps and all data are reported. The best performance of each column is highlighted.

Metric	Method	Fig. 2	Fig. 3	Deficit	Normal	All data
RMSE	cTSVD	9.47	12.05	12.72±6.45	11.46±3.28	12.09±4.87
	KSVD-SPD	7.99	9.32	10.05±4.33	8.65±1.98	9.35±3.26
	Proposed	7.23	8.74	9.24±4.62	8.28±2.53	7.32±3.54
PSNR	cTSVD	33.89	34.46	32.95±1.79	31.77±2.30	32.36±2.04
	KSVD-SPD	34.67	36.70	34.71±1.42	34.03±2.31	34.37±1.85
	Proposed	36.23	37.25	35.73±1.48	34.75±2.36	35.24±1.93