Table 3.

Comparison of radiation dose and operation time among the three groups.

Dose parameters	Conventional group	optimized length group	Low-dose optimized length group	Con/ Opti	Opti/Low
				P	P
positioning DLP(mGy·cm)	312.4 ​± ​143.9	287.5 ​± ​130.1	33.87 ​± ​11.99	0.274	<0.001
guided DLP(mGy·cm)	294.3 ​± ​259.4	185.3 ​± ​157.4	21.34 ​± ​15.10	0.003	<0.001
review DLP(mGy·cm)	241.7 ​± ​197.2	220.2 ​± ​141.3	27.10 ​± ​14.55	0.451	<0.001
Total mAs	6211 ​± ​3043	5122 ​± ​2111	1070.6 ​± ​306.7	0.013	<0.001
Average CTDIvol(mGy)	9.79 ​± ​3.75	9.44 ​± ​3.04	1.33 ​± ​0.38	0.531	<0.001
ED(mSv)	11.95 ​± ​5.86	9.77 ​± ​4.07	1.23 ​± ​0.41	0.010	<0.001
Operation duration(min)	25.85 ​± ​8.95	22.40 ​± ​7.45	21.42 ​± ​7.91	0.021	0.214