Radiation dose reduction with application of non-linear adaptive filters for abdominal CT

Table 3 Weight and maximum transverse diameter distribution of number of subjects with acceptable and unacceptable subjective image noise in abdominal computed tomography examinations for unprocessed and non-linear adaptive filters processed image series at 150, 100 and 50 mAs tube current-time product levels (mean ± SD)

	Unprocessed images		Processed images
	Acceptable noise	Unacceptable noise	Acceptable noise	Unacceptable noise
150 mAs	14/19	5/19	19/19	0/19
Weight (kg)	74.5 ± 14.8	95.2 ± 11.1	79.9 ± 16.5	-
Transverse diameter (cm)	34.2 ± 4.3	42.9 ± 4.5	36.5 ± 5.8	-
100 mAs	4/19	15/19	17/19	2/19
Weight (kg)	77.1 ± 4.0	80.7 ± 18.6	76.9 ± 14.6	106.0 ± 4.3
Transverse diameter (cm)	32.5 ± 3.5	37.6 ± 5.9	35.7 ± 5.6	43.5 ± 0.7
50 mAs	0/19	19/19	5/19	14/19
Weight (kg)	-	79.9 ± 16.5	66.2 ± 13.0	91.4 ± 15.1
Transverse diameter (cm)	-	36.5 ± 5.8	33.0 ± 3.4	40.6 ± 6.1

Subjects with unacceptable image noise in processed images were significantly heavier and had greater transverse diameter than subjects with acceptable image noise.