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. 2021 Nov 8;21:165. doi: 10.1186/s12880-021-00683-4

Table 5.

Low-contrast resolution results of the CT scan

Low-contrast resolution ROIs Insert Background #1 Background #2 Background #3
0.5% CT value (HU) 7.73 1.04 3.30 3.32
SD (HU) 2.37 2.18 2.28 1.83
Mean of ΔCT (HU) 5.18
CNR 2.47
1.0% CT value (HU) 11.16 1.61 1.57 1.04
SD (HU) 2.03 2.08 1.98 2.18
Mean of ΔCT (HU) 9.75
CNR 4.69
1.5% CT value (HU) 20.23 4.29 4.85 5.36
SD (HU) 1.89 2.24 1.80 2.44
Mean of ΔCT (HU) 15.40
CNR 7.25

ΔCT = CTInsert − CTBackground-i i = 1, 2, and 3. Numbers in bold are the low-contrast measurement results