Table 1.

Whole-slice averaged signals, noises, and SNRs of perfusion difference images at seven delays using different acquisition methods

Method		Delay1	Delay 2	Delay 3	Delay 4	Delay 5	Delay 6	Delay 7
Hadamard	Signal	*20.29±5.18	22.00±2.26	21.67±2.39	14.22±1.54	6.99±1.00	5.47±1.24	4.82±0.98
	Noise	3.25±0.19	3.36±0.25	3.43±0.36	3.57±0.42	3.51±0.31	3.38±0.34	3.31±0.31
	SNR	6.22±1.46	6.58±0.83	6.41±1.19	4.02±0.61	2.00±0.31	1.64±0.41	1.46±0.24
Sequential	Signal	18.57±5.77	22.98±2.30	23.17±2.24	16.06±2.59	7.72±1.11	5.95±2.94	2.57±2.21
	Noise	6.76±0.65	6.70±0.59	6.88±0.73	6.63±0.34	6.69±0.52	6.87±0.61	6.44±0.40
	SNR	2.78±0.97	3.47±0.56	3.38±0.20	2.43±0.40	1.16±0.20	0.86±0.38	0.40±0.33

^*Values are mean ± standard deviation across subjects.