Comparison of imaging quality and radiation dosage of the different tube voltage of the pulmonary artery CT and contrast agent dose

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Objective To contrastively analyze the imaging quality and radiation dosage of the different tube voltage of the pulmonary artery CT and contrast agent dose, so that for formulating the reasonable imaging protocol of the CT pulmonary angiography. Methods Ninety patients suspected with the pulmonary artery embolism were selected as the study objects. The patients were divided into two groups, with 45 cases in each group. The two groups were given different contrast agent doses and tube voltage, and then the segment CT value of pulmonary artery, noise ratio, signal to noise ratio, background noise level, display situation of vein artifact, grade of pulmonary artery imaging and radiation dosage were compared. Results There were significant differences in the noise ratio, signal to noise ratio, background noise level, display situation of vein artifact and radiation dosage between the two groups (P 0.05). Conclusions Lower contrast agent dose and tube voltage can get better CT pulmonary angiography, which is not only able to satisfy the requirements of the clinical diagnosis, meanwhile able to reduce the contrast dosage and radiation dosage, so is worth promotion. Key words: Pulmonary artery embolism; CT pulmonary angiography; Contrast agent dose; Tube voltage; Imaging quality; Radiation dosage