The value of dual-source CT prospective ECG-gated technique in central venous angiography
HU Xianghua, LU Chenying, ZHAO Zhongwei, CHEN Chunmiao, LIN Guihan, SU Yanping, JI Jiansong
Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Department of Radiology,Lishui Central Hospital, Lishui 323000, China
HU Xianghua,LU Chenying,ZHAO Zhongwei, et al. The value of dual-source CT prospective ECG-gated technique in central venous angiography[J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2021, 51(2): 138-141,145.
Abstract：Objective: To evaluate the value of prospective ECG-gated technique in central venous angiography. Methods: Sixty patients who underwent central venous CTV with Siemens third-generation dualsource Force CT in our hospital from July 2016 to January 2020 were randomly divided into two groups of 30 and were treated with 120 kV tube voltage, an effective tube current of 100 mAs and Care Dose 4D technology with a collimation width of 192×0.6 mm. The conventional scanning mode was used in the routine group, with pitch 0.8 and rotational speed 0.5 s/circle. The prospective ECG-gated group rotational speed 0.25 s/circle, when the heart rate was less than 70 beats/min, the scan was triggered by 60%-70% phase; when the heart rate was more than 70 beats/min, the scan was triggered by 30%-45% phase; and the best phase image was automatically reconstructed by the system. The (ED), scanning time of the effective radiation dose, and the image quality of the central vein were compared between the two groups. Results: There was no significant difference in age, sex,heart rate, BMI, and scan length between the routine group and the prospective ECG-gated group (P>0.05). The scanning time in the routine group (3.29±0.41)s was significantly less than that in the prospective ECG-gated group (9.91±0.95)s, and there was significant difference between the two groups (P<0.05). The DLP (mGy·cm),CTDIvol (mGy), and ED (mSv) of the routine group were 234.26±26.52, 9.27±0.88, and 3.98±0.45 respectively.There was no significant difference in DLP, CTDIvol, and ED between the prospective ECG-gated group and the
prospective ECG-gated group (233.01±25.89, 9.24±0.97 and 3.96±0.44, respectively) (P>0.05). Nonparametric test was used to compare the image quality of 420 segments of the central vein between the two groups. The image quality scores of superior vena cava, left brachiocephalic vein and right brachiocephalic vein in the prospective ECG-gated group were significantly higher than those in the routine group (P<0.05). The image quality scores of the left subclavian vein, right subclavian vein, left jugular vein and right jugular vein were better in the two groups, but there was no significant difference between the two groups (P>0.05). Conclusion: The prospective ECG-gated technique is superior to conventional spiral CT scan in the examination of central venous vessels,which is worthy of clinical application.
