Clinical value and feasibility of CT pulmonary angiography with personalized injection of contrast agent in pulmonary embolism

Objective: To determine the clinical value and feasibility of CT pulmonary angiography (CTPA) with person-alized injection of contrast agent in pulmonary embolism (PE). Methods: In the present retrospective study, 130 patients who underwent CTPA examination in our hospital from June 2019 to May 2020 were evaluated. Among them, 67 cases were detected by CTPA with personalized injection of contrast agent as the observation group (Obs group), and 63 cases were detected by CTPA with bolus-tracking (BT) as the control group (Con group). The specific-ity, sensitivity and accuracy of the detection in the two groups were compared. The image quality score and superior vena cava artifact score of the two diagnostic methods were compared. Additionally, the volumetric CT dose index (CTDIvol) and dose length product (DLP) of the two groups were compared. Results: The Obs group yielded a sig-nificantly higher specificity in diagnosing PE than the Con group (P < 0.05), but there were no significant differences between the two groups in the sensitivity and accuracy (P > 0.05). The image quality score and superior vena cava ar-tifact score of the two groups were not significantly different (P > 0.05), and the Obs group showed significantly lower CTDIvol and DLP than the Con group (P < 0.05). Conclusion: CTPA with personalized injection of contrast agent has good diagnostic value for PE, with good imaging effect and safe profile, and has a lower radiation dose requirement.