Table 2.

Impact of positioning mode on radiation dose and off-center distance of COVID-19 patients

Positioning mode	CTDIvol (mGy)	DLP (mGy.cm)	ED (mSv)	Off-center distance (cm)	Scan range (cm)
MP (n = 127)	14.9 ± 2.3	523.4 ± 87.7	7.3 ± 1.2	4.05 ± 2.40	35.16 ± 3.32
AP (n = 127)	13.3 ± 2.4	437.4 ± 95.6	6.1 ± 1.3	1.56 ± 0.83	32.97 ± 3.89
p value	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001

Data were presented as mean ± standard deviation (SD). p values denoted the comparison of different positioning mode groups. MP, manual positioning; AP, AI-based automatic positioning