Image quality improvement using model-based iterative reconstruction in low dose chest CT for children with necrotizing pneumonia

Table 2 Objective image noise measurements

Tissue	Image^a	CT value		Noise		SNR
Tissue	Image^a	Mean ± SD	P	Mean ± SD	P	Mean ± SD	P
Consolidated lesion	MBIR	71.1 ± 9.3	-	13.9 ± 4.0	-	5.5 ± 1.6	-
	ASIR	67.9 ± 12.7	0.13	24.9 ± 6.6	<0.01	2.9 ± 0.9	<0.01
	5 mm FBP	63.9 ± 7.9	<0.01	17.2 ± 6.4	0.02	4.1 ± 1.3	<0.01
	FBP	68.9 ± 12.1	0.10	33.8 ± 8.7	<0.01	2.2 ± 0.6	<0.01
Necrotic area	MBIR	14.8 ± 5.7	-	9.4 ± 1.4	-	1.6 ± 0.6	-
	ASIR	16.2 ± 5.5	0.02	22.3 ± 1.6	<0.01	0.7 ± 0.3	<0.01
	5 mm FBP	15.6 ± 5.0	0.19	9.9 ± 1.8	0.25	1.6 ± 0.6	0.92
	FBP	16.2 ± 5.0	0.05	30.2 ± 3.0	<0.01	0.5 ± 0.2	<0.01
Muscle	MBIR	57.4 ± 7.2	-	12.1 ± 2.2	-	4.9 ± 1.1	-
	ASIR	56.3 ± 6.6	0.48	22.7 ± 4.3	<0.01	2.6 ± 0.7	<0.01
	5 mm FBP	56.6 ± 6.6	0.49	12.9 ± 2.3	0.07	4.5 ± 0.8	0.04
	FBP	56.2 ± 8.9	0.21	30.7 ± 5.8	<0.01	1.9 ± 0.5	<0.01
Air	MBIR	−994.8 ± 4.3	-	3.6 ± 1.9	-	−407.9 ± 280.0	-
	ASIR	−996.7 ± 3.2	0.08	11.2 ± 2.1	<0.01	−92.3 ± 18.8	0.01
	5 mm FBP	−996.8 ± 2.6	0.09	5.2 ± 1.2	<0.01	−203.9 ± 51.4	0.02
	FBP	−996.5 ± 4.0	0.16	15.0 ± 2.7	<0.01	−69.0 ± 14.5	0.01

ISSN: 1471-2342