Table 1 The values (mean ± standard deviation (SD)) of raw Hounsfield unit (HU) and normalized Hounsfield unit (nHU) as well as raw pixel brightness (PB) and normalized pixel brightness (nPB) measured for ten steps of density standard (S1–S10)
S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | S9 | S10 | |
|---|---|---|---|---|---|---|---|---|---|---|
HU mean | 1009 | 1212 | 1407 | 1600 | 1804 | 2011 | 2204 | 2400 | 2607 | 2803 |
± SD | 163 | 111 | 98 | 134 | 112 | 99 | 107 | 133 | 129 | 147 |
nHU | 0 | 0.11 | 0.22 | 0.33 | 0.44 | 0.56 | 0.67 | 0.78 | 0.89 | 1.00 |
PB mean | 83.0 | 93.5 | 101.1 | 108.5 | 115.2 | 121.3 | 127.7 | 133.7 | 143.1 | 168.6 |
± SD | 10.5 | 10.5 | 11.3 | 12.0 | 12.6 | 12.9 | 13.8 | 14.5 | 16.7 | 17.6 |
nPB | 0 | 0.07 | 0.17 | 0.21 | 0.26 | 0.29 | 0.35 | 0.42 | 0.53 | 1.00 |