Assessment of sub-milli-sievert abdominal computed tomography with iterative reconstruction techniques of different vendors

Table 4 Subjective image quality scores for reduced dose B-1, reduced dose B-2, and reduced dose B-3

	B-1		B-2		B-3
Reader 1
Lesions	1 (4/27)	2 (22/27)	1 (4/27)	2 (19/27)	1 (7/27)	2 (18/27)
	3 (1/27)		3 (4/27)		3 (2/27)
Liver margins	1 (14/22)	2 (8/22)	1 (12/22)	2 (10/22)	1 (16/22)	2 (6/22)
Liver parenchyma	1 (1/22)	2 (16/22)	1 (1/22)	2 (14/22)	1 (1/22)	2 (16/22)
	3 (5/22)		3 (7/22)		3 (5/22)
Adrenals	1 (2/22)	2 (14/22)	1 (2/22)	2 (13/22)	1 (3/22)	2 (15/22)
	3 (6/22)		3 (7/22)		3 (4/22)
Bowels	3 (7/23)	2 (15/22)	3 (7/23)	2 (15/22)	3 (6/23)	2 (16/22)
Reader 2
Lesions	1 (5/30)	2 (19/30)	1 (8/30)	2 (18/28)	1 (7/30)	2 (15/30)
	3 (6/30)		3 (4/30)		3 (8/30)
Liver margins	1 (6/22)	2 (14/22)	1 (8/22)	2 (13/22)	1 (6/22)	2 (14/22)
	3 (2/22)		3 (1/22)		3 (2/22)
Liver parenchyma	3 (17/22)	2 (5/22)	3 (16/22)	2 (6/22)	3 (18/22)	2 (4/22)
Adrenals	1 (3/22)	2 (10/22)	1 (4/22)	2 (11/22)	1 (2/22)	2 (9/22)
	3 (9/22)		3 (7/22)		3 (11/22)
	3 (4/22)		3 (1/22)		3 (5/22)
Bowels	1 (4/22)	2 (16/22)	1 (5/22)	2 (16/22)	1 (3/22)	2 (17/22)
	3 (2/22)		3 (1/22)		3 (2/22)

Score (seen by number of lesions or patients/total number of lesions or patients), score of 1 = sufficient, 2 = limited, 3 = unacceptable for clinical diagnostic confidence.