Application of individualized "double low" technique in coronary artery angiography on the third generation dual-source CT
10.13929/j.1672-8475.201808046
- Author:
Mingyu CUI
1
Author Information
1. Department of Radiology, the First Affiliated Hospital of Zhengzhou University
- Publication Type:Journal Article
- Keywords:
Contrast media;
Coronary vessels;
Image quality;
Radiation dosage;
Tomography, X-ray computed
- From:
Chinese Journal of Interventional Imaging and Therapy
2019;16(1):52-56
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To investigate image quality and radiation dose of the third generation dual-source CT with low dose contrast agent dosage and low velocity. Methods Totally 120 patients who underwent CT coronary artery angiography scanning were analyzed prospectively. The patients were randomly assigned to the study group and control group (each n=60). In study group, the dose and injection flow rate of contrast agent were determined according to the formula: Contrast agent dose=patients' body mass×0.6 ml/kg, injection flow rate=contrast agent dose/(5+exposure time). In control group, the injection flow rate was 5.0 ml/s, and the volume of contrast medium was 50 ml. Patients in both groups underwent prospective ECG gated narrow window scanning. Quantitative parameters, qualitative visual parameters and radiation dose were compared between the groups. Results No statistical difference was found in the gender, age, body mass and body mass index (all P>0.05), while a significant difference was found in the amount of consumed iodine and the velocity of contrast agent between the two groups (P<0.001). No statistical difference of SNR, images quality nor the proportion of evaluable numbers to all coronary numbers was found between the two groups (all P>0.05). For different heart rates (HR; HR≤70 bpm,70 bpm 80 bpm), the effective dose had significant differences (all P<0.05). Conclusion: The individualization of injection method in the third generation dual-source CT coronary artery angiography could minimize the amount of contrast agent while meet clinical requirements.
