Study on the Image Quality of Low Flow Rate and Low Contrast Agent in the Pulmonary Artery Based on Energy Spectrum CT
Objective To investigate the feasibility of spectral CT monochromatic energy technology combined with low flow rate and low contrast agent in pulmonary artery CTA,and to evaluate the image quality.Methods A retrospective analysis of 146 patients who underwent pulmonary artery CTA examination in our hospital was conducted.They were randomly divided into two groups,73 cases in each group.The control group was scanned by conventional spiral CT,and the observation group was scanned by energy spectrum CT combined with low contrast agent and low flow rate method.The objective score,subjective score and average iodine intake of the two groups were compared.Results there was no significant difference in the average CT value and image subjective score of pulmonary artery trunk,left and right pulmonary artery trunk between the two groups.The background noise(SD),signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)in the observation group were slightly higher than those in the control group,but there was no significant difference between the two groups.The CT volume dose index(CTDI vol),radiation dose length product(DLP)and effective radiation(ED)in the observation group were significantly lower than those in the control group(P＜0.05).The effective radiation and average iodine intake in the observation group were 34.82％and 48.25％lower than those in the control group,respectively,and the difference was statistically significant(P＜0.05).Conclusion the application of low flow rate and low contrast medium combined with energy spectrum CT single energy technique can significantly reduce the radiation dose and iodine intake of patients on the basis of image quality meeting the diagnostic requirements.
NETL
NSTL
万方数据
维普
