Table 1.

Summary of the regression and paired t‐test analyses comparing ATD sizes to lesion sizes measured on T1‐ and T2‐weighted MR images

MRI sequence	ATD (CEM)	Regression slope	Regression R 2	ATD — lesion mean (mm)	ATD — Lesion SD (mm)	t‐test P‐value	95% CI lower (mm)	95% CI upper (mm)
T1‐weighted	17	1.53	0.34	3.0	1.4	<0.005	2.6	3.3
	40	1.32	0.48	1.8	1.0	<0.005	1.5	2.0
	100	1.14	0.54	0.8	0.9	<0.005	0.6	1.0
	200	1.00	0.60	0.1	0.8	0.44	−0.1	0.3
	240	0.96	0.66	‐0.1	0.7	0.09	−0.3	0.0
T2‐weighted	17	1.33	0.42	2.1	1.3	<0.005	1.8	2.4
	40	1.14	0.54	0.9	1.0	<0.005	0.7	1.2
	100	0.98	0.58	−0.1	0.9	0.64	−0.3	0.2
	200	0.87	0.64	−0.8	0.8	<0.005	−1.0	−0.6
	240	0.84	0.69	−1.0	0.7	<0.005	−1.2	−0.8

R ² = coefficient of determination, SD = standard deviation, CI = confidence interval.