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| Effect of Delay Time and Scanning Time on the Quality of Direct Lower Extremity Venography by 320-Row Spiral CT |
| CAO Hongwei, CHENG Yanfen, WANG Shenglin, et al |
| The Affiliated Hospital of Chengde Medical University, Hebei Chengde 067000, China |
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Abstract Objective: To evaluate the image quality of direct lower extremity venography by 320-row spiral CT under different CT delay time and scanning time, optimize CT machine scanning plan and obtain the best imaging parameters. Methods: 60 patients with suspected inferior vena cava or lower extremity venous diseases were performed direct CT venography of lower extremity with Toshiba 320-row spiral CT. Under the same liquid volume (200ml), contrast medium concentration (1∶7~1∶9) and injection rate of 3.0ml/s, the delay time and scanning time of group A were 50s and 10~20s respectively. In group B, the delay time was 30s and the scanning time was 20~30s. In group C, the delay time was 20 s and the scanning time was 30 ~ 40 s. All the images were sent to the post-processing workstation for VR and MIP reconstruction. The image quality of lower extremity venography was evaluated according to four grades and analyzed statistically. Results: The image quality of each experimental group was not the same. There was no significant difference between group B and group C, and the image quality was good or excellent. There was significant difference between group A and groups B and C, and the image quality was mainly good and fair. Conclusion: Under the condition of the same liquid volume (200ml), contrast medium concentration (1∶7 ~ 1∶9) and injection rate of 3.0ml/s, 320-Row spiral CT direct lower extremity venography can be used to obtain images satisfying clinical diagnostic needs by using delay time 50s and scanning time 20~30s.
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2022, Vol. 28 
