Table 4. Image Noise Values of Five Different Reconstruction Algorithms.

Radiation Doses	FBP	HIR	IMR-R1	IMR-ST1	IMR-SP1	P
120 kVp/100 mAs	21.70 ± 3.41	19.39 ± 2.59	4.93 ± 0.80	3.22 ± 0.66	9.69 ± 1.36	< 0.001
120 kVp/50 mAs	28.33 ± 5.27	24.64 ± 3.30	6.22 ± 1.23	4.19 ± 1.37	11.01 ± 1.60	< 0.001
120 kVp/20 mAs	40.36 ± 8.24	34.89 ± 5.11	8.59 ± 1.58	5.49 ± 1.16	13.25 ± 1.85	< 0.001
120 kVp/10 mAs	54.02 ± 12.80	46.68 ± 7.44	10.54 ± 2.27	6.88 ± 1.91	15.56 ± 3.25	< 0.001
80 kVp/10 mAs	96.67 ± 21.04	80.70 ± 11.32	16.25 ± 6.16	12.49 ± 6.14	20.48 ± 5.17	< 0.001