Table 2. Subjective image quality scores and and quantitative attenuation measurements of LD and ULD and HYPR-LR post-processed BPCT data sets.
| Subjective image quality score | Maximum attenuation in time series (HU) | Minimum attenuation in time series (HU) | Area under attenuation curve in time series | SNR | |
| ULD, mean ± SD (range) | 5.0±0.2 (4–5) | 57±6 (49–71) | 36±5 (30–46) | 2724±263 (2241–3210) | 1.93±0.26 (1.40–2.32) |
| ULD + HYPR, mean ± SD (range) | 2.7±0.7 (2–4) | 56±7 (44–68) | 38±4 (31–47) | 2724±263 (2241–3210) | 8.39±1.67 (5.08–11.32) |
| LD, mean ± SD (range) | 3.3±0.5 (3–4) | 55±6 (44–67) | 40±3 (35–47) | 2767±210 (2341–3157) | 4.96±0.74 (3.77–6.69) |
| LD + HYPR, mean ± SD (range) | 1.3±0.5 (1–2) | 54±6 (44–65) | 41±3 (36–47) | 2758±211 (2341–3157) | 13.36±2.36 (8.92–17.07) |
| p-value ULD vs. ULD + HYPR | 0.33 | 0.07 | 0.99 | <0.0001 | |
| p-value LD vs. LD + HYPR | 0.63 | 0.35 | 0.89 | <0.0001 | |
| p-value LD vs. ULD + HYPR | 0.67 | 0.13 | 0.53 | <0.0001 | |
| p-value ULD vs. LD | 0.15 | 0.001 | 0.53 | <0.0001 |
Note: Subjective quality score are reported as mean values.