Table 4.

Intra- and inter-observer agreement of CTA and MRI morphometric parameters

Parameter	Intra-observer				Inter-observer
	r	y = ax + β	Bias (upper, lower limits)	Variability (%)	r	y = ax + β	Bias (upper, lower limits)	Variability (%)
By MRI
Wall thickness	0.92	1.0x + 0.0	0.10 −0.11	1.1 ± 1.8	0.86	1.3x + 0.3	0.14 −0.18	1.6 ± 2.0
NER	0.96	0.9x + 0.1	0.10 −0.08	1.9 ± 1.3	0.89	0.64x + 0.4	0.38 −036	2.8 ± 4.3
By CTA
Plaque area	0.90	0.9x + 0.0	0.92 −1.26	7.2 ± 5.6	0.96	1.1x – 0.2	0.88 −1.27	4.7 ± 4.9
Plaque volume	0.96	0.9x + 0.2	1.35 −1.22	4.4 ± 5.9	0.95	1.1x + 0.1	1.04 −0.69	4.5 ± 6.2

NER, normalized enhancement ratio; MRI, magnetic resonance imaging; CTA, computed tomography angiography.