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Table 2: Visibility grade of 30 vestibular aqueducts viewed by 2 readers on 45° oblique and axial reformats
Visibility Grade Observer 1 Observer 1 Observer 2 Observer 2
45° Oblique Axial 45° Oblique Axial
1 1 (3%) 3 (10%) 1 (3%) 4 (13%)
2 3 (10%) 9 (30%) 6 (20%) 11 (37%)
3 26 (87%) 18 (60%) 23 (77%) 15 (15%)
Visibility Grade	Observer 1	Observer 1	Observer 2	Observer 2
	45° Oblique	Axial	45° Oblique	Axial
1	1 (3%)	3 (10%)	1 (3%)	4 (13%)
2	3 (10%)	9 (30%)	6 (20%)	11 (37%)
3	26 (87%)	18 (60%)	23 (77%)	15 (15%)