Table 2.

Comparison of n = 20 knee examinations with all three modalities: CT, 3-T MRI, and 7-T MRI in regard to (a) cartilage calcification (no/yes), (b) diagnostic confidence level (1 = “not confident,” 2 = “moderately confident,” 3 = “quite confident,” 4 = “highly confident”), and (c) sharpness of calcifications (1 = “very fuzzy,” 2 = “fairly fuzzy,” 3 = “fairly sharp,” 4 = “very sharp”). Cochrane Q test (°) was applied for the item “cartilage calcification,” otherwise Friedman test (⁺) was used. p values < .05 are considered to represent statistical significance

Comparison of cartilage calcification between CT, 3-T MRI, and 7-T MRI
Parameter		CT N = 20	3 T N = 20	7 T N = 20	p value °Cochrane Q test +Friedman test	Multiple comparison analysis
Calcification (no/yes) n (%)	Reader 1	14/146 (9%/91%)	20/140 (13%/87%)*	13/147 (8%/92%)	0.008°	Different from CT and 7 T*
	Reader 2	14/146 (9%/91%)	24/136 (15%/85%)*	13/147 (8%/92%)	< 0.001°	Different from CT and 7 T*
Diagnostic confidence, median (range) 1 = not confident 4 = highly confident	Reader 1	4 (1–4)	4 (1–4)*	4 (1–4)	< 0.001+	Different from 7 T*
	Reader 2	4 (1–4)	4 (1–4)*	4 (1–4)	< 0.001+	Different from CT and 7 T*
Sharpness of calcification, median (range) 1 = very fuzzy 4 = very sharp	Reader 1	2 (1–4)	2 (1–4)	3 (1–4)*	< 0.001+	Different from CT and 3 T*
	Reader 2	2 (1–4)	2 (1–4)	4 (1–4)*	< 0.001+	Different from CT and 3 T*

*Statistically significant difference in the respective score, column “multiple comparison analysis” specifies between which two modalities the differences occur