Table 2.

Relative data by normalization - Mean and Standard Deviation for rCBV, dMTT, and dTTP (n=21 patients)

PWI parameter		Mean	Standard Deviation	P
rCBV	Before CAS	0.96	0.14	0.940
	After CAS	0.97	0.10
dMTT	Before CAS	−0.06	14.73	<0.001
	After CAS	−3.46	14.65
dTTP	Before CAS	0.12	1.00	0.019
	After CAS	−0.47	1.08
Note: CAS indicates carotid angioplasty and stenting;. dMTT indicates MTT difference; dTTP, TTP difference; rCBV, CBV ratio. Paired t test.