| The Clinical Application Value of Real Time Threshold Manual Triggering Technique in the Lower Extremity Arterial CT Angiography |
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| Citation of this paper:HOU Kai,Lü Peng,GU Junying,LU Xiuliang.The Clinical Application Value of Real Time Threshold Manual Triggering Technique in the Lower Extremity Arterial CT Angiography[J].Chinese Journal of Clinical Medicine,2016,23(1):81-85 |
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| Author Name | Affiliation | E-mail | | HOU Kai | Department of Diagnostic Radiology,Zhongshan Hospital,Fudan University, Shanghai 200032, China | | | Lü Peng | Department of Diagnostic Radiology,Zhongshan Hospital,Fudan University, Shanghai 200032, China | | | GU Junying | Department of Diagnostic Radiology,Zhongshan Hospital,Fudan University, Shanghai 200032, China | | | LU Xiuliang | Department of Diagnostic Radiology,Zhongshan Hospital,Fudan University, Shanghai 200032, China | lu.xiuliang@zs-hospital.sh.cn |
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| Abstract:Objective: To investigate the clinical avalue of real time threshold manual triggering technique in the lower extremity arterial CT angiography. Methods: A total of 70 patients with clinically suspected lower extremity arterial disease underwent lower extremity arterial CT examination, and the patients were randomly divided into two groups.In the first group 35 patients, the automatic threshold triggering technique was used. After the threshold reached to 150 Hu, 6 s was delayed before scanning. The other group of 35 patients with manual triggering was used to observe the time density curve. When the peak value was stable, scanning was started at once. The delay time of the two groups was analyzed and the image quality of the two groups was evaluated. The image quality evaluation included the branch level, the smooth degree of the arterial edge, the interference of the vein and the CT value of the arterial segment. Results: There were significant differences in the starting delay time of the two trigger modes (P=0.002, P＜0.05), and the auto trigger group was earlier than the manual triggering group. Between the two trigger modes, there was no significant difference in the distal branches and vessel edge of abdominal-iliac artery and femoral popliteal artery display ability. In the lower limb artery ,the image quality of manual triggering group was higher than that of the automatic trigger group ,the two groups had statistical significance(P=0.004, P=0.003). The same as to the distal branch and the edge of the vessel of the foot(P=0.003, P=0.003). Two sets of images in the lower limb vein interference score had no significant difference (P＞ 0.05). CT value had no significant difference in abdominal-iliac artery, femoral-calf and popliteal arteries between the two groups, while that in the dorsalis pedis artery had statistical significance between the two groups (P=0.006). Four levels of CT values in manual triggering group were higher than those in the automatic trigger group. Conclusions:Real time threshold manual triggering technique takes into account the individual differences of patients, so the patient's delay scan time can be evaluated better and higher quality of lower extremity arterial images can be acquired. |
| keywords:Lower extremity artery CT angiography Real time threshold manual triggering technique |
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