双流法肺动脉技术在肺动脉扫描中的应用评价.

Objective To explore the application value of double-flow method of CT angiography using a mixture of normal saline and contrast agent before injection of contrast agent to achieve differential imaging within the human body in CT pulmonary angiography (CTPA). Methods Forty patients with clinically suspected pulmonary embolism at our hospital from January 2022 to March 2024 were randomly divided into monitoring scanning control group (20) and dual-flow scanning study group (20) for CTPA using Philips 128-row spiral CT. In the control group, region of interest (ROI) was placed in the superior vena cava (SVC) with a threshold of 150 HU, 50 mL iobitridol (350 mg I/mL) and 30 mL normal saline were continuously injected. In the experimental group, ROI was placed in the pulmonary trunk (PT) with a threshold of 60 HU, 6 mL of contrast agent and 16 mL of normal saline mixture, 17 mL of contrast agent and 3 mL of normal saline mixture, and 30 mL of normal saline solution were continuously injected. The CT values of PT, pulmonary vein (PV) and SVC of the two groups were measured and the image quality was compared. Results There was no significant difference (t=-2.16, -1.168; P>0.05) between the CT values of PT (371.35±60.16) and PV (153.8±30.29) in the control group and that of the experimental group (360.1±48.09, 154.25±45.97). These numbers are the same for both groups. The SVC CT value of the study group (198.5±55.97) was significantly lower (t=-8.048, P<0.05) than that of the control group (1001.25±299.55). There was no significant difference in pulmonary artery subjective scores between the experimental group and the control group (P=0.085). The subjective score of superior vena cava artifact in the experimental group was significantly higher than that in the control group (P=0.000). Conclusion Double-flow CTPA uses less contrast agent with decreased enhancement of SVC and better PT image quality. [ABSTRACT FROM AUTHOR]