Table 2. Comparison of objective image quality with different reconstruction in RD and LD scans.
| Parameters | RD-FBP | LD-FBP | LD-IMR | P value |
|---|---|---|---|---|
| Attenuation (HU) | ||||
| Ascending aorta | 167.53±18.95 | 181.95±14.98* | 180.89±13.98* | 0.006 |
| Liver | 109.39±8.32 | 118.36±15.20* | 119.95±15.60* | 0.021 |
| Fat tissue | −41.95±4.04 | −30.95±4.14* | −31.89±4.30* | 0.035 |
| Noisec (HU) | 10.64±2.07 | 12.51±3.56* | 6.22±1.67*# | 0.000 |
| Noisea (HU) | 13.33±2.60 | 16.40±5.14* | 7.65±1.65*# | 0.000 |
| CNR | 11.35±4.13 | 9.10±4.46* | 19.85±5.16*# | 0.000 |
*, significant difference compared with RD-FBP; #, significant difference compared with LD-FBP. Noisec, image noise of chest; Noisea, image noise of abdomen; RD, routine dose; LD, low dose; FBP, filtered back projection; IMR, iterative model reconstruction.