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

Table 2 Average objective image noise and HU values in abdominal computed tomography examinations for non-linear adaptive filters processed and unprocessed image series at four different radiation dose levels (mean ± SD)

	Baseline (200 mAs)	Unpro (150 mAs)	Pro (150 mAs)	Unpro (100 mAs)	Pro (100 mAs)	Unpro (50 mAs)	Pro (50 mAs)
Liver
Objective noise	15.5 ± 3.9	18.2 ± 4.9	14.4 ± 4.0	21.9 ± 5.6	15.7 ± 4.0	30.4 ± 9.2	18.8 ± 5.0
HU values	70.9 ± 15.0	70.5 ± 16.9	70.6 ± 16.0	71.2 ± 16.0	71.0 ± 16.0	70.1 ± 16.0	70.1 ± 16.0
Abdominal Aorta
Objective noise	17.4 ± 4.2	20.5 ± 5.4	16.0 ± 3.8	24.8 ± 6.2	18.5 ± 4.2	34.3 ± 9.3	22.0 ± 6.0
HU values	80.5 ± 29.0	81.6 ± 37.0	81.5 ± 31.0	82.0 ± 33.7	82.1 ± 33.0	80.3 ± 31.0	80.0 ± 31.0

Objective image noise was decreased in non-linear adaptive filters processed image as opposed to unprocessed image series with no significant change in average HU values. Unpro: Unprocessed; Pro: Processed.