TABLE 2:

Results of linear regression of cerebral blood flow values measured by MR imaging versus cerebral blood flow values measured by positron emission tomography

Participant	Ipsilateral AIF			Contralateral AIF
Participant	r	Slope	y-int.^*	r	Slope	y-int.^*
1	0.65	0.48	9.30	0.66	0.47	9.11
2	0.75	0.70	2.63	0.72	0.67	4.42
3	0.50	0.42	20.8	0.62	0.55	15.9
4	0.88	1.04	5.20	0.85	0.88	9.10
5	0.88	0.94	0.38	0.88	0.97	0.27
6	0.80	1.05	−9.44	0.82	1.17	−14.7
7	0.79	1.65	−5.74	0.81	2.14	−17.7
Pooled^†	0.60	0.55 ± 0.05	16.6 ± 1.99	0.54	0.54 ± 0.05	17.6 ± 2.26

For each participant and for the pooled data, the linear correlations between cerebral blood flow values measured by MR imaging and cerebral blood flow values measured by by positron emission tomography, both for ipsilateral and contralateral arterial input functions, are statistically significant (P < .001).
* y-intercepts of regression lines are expressed in mL/100 mL/min.
† Mean linear regression parameters of pooled data from all seven participants (Fig 5A) and standard errors of the mean for slopes and y-intercepts of regression lines.
Note.—AIF indicates arterial input function; y-int., y intercepts of the regression lines. The slopes represent cerebral blood flow values measured by MR imaging versus cerebral blood flow values measured by positron emission tomography and therefore are dimensionless.