Research Application Of Carotid CTA Using Low Tube Voltage, Low Concentration Of Contrast Medium On 64 Row-CT

Objective: To investigate the image quality and the radiation dose of the carotid computed tomographic angiography by using low dose scanning technology and low concentrative contrast medium.Methods:sixty patients were randomly selected into two groups(group A and group B).A group 32 cases were examined with 120 k V, and the contrast medium used was Omnipaque(350mg I/ml);B group 28 cases were examined with 100 k V, and the contrast medium used was Visipaque(270mg I/ml);Two observers double-blinded independently assessed the image quality score and measured the different image parameters including image noise, signal-to-noise ratio and contrast-to-noise ratio. recording the CTDIvol and DLP and account effective radiation. SPSS18.0 statistics software was applied. The patients general information, image quality, The amount of iodineand and radiation dose were compared between the two groups.Results:A and B group patients have no statistical significance between general information,the amount of contrast medium(p > 0.05).There was no statistical significance with image quality between group A and group B(P>0.05),but have statistically significance with total iodine intake, ED, CTDIvol and DLP. The difference between group A and group B was statistically significant with Carotid bifurcation vascular CT value, SNR, CNR(p<0.05),the noise was no significant difference(P> 0.05).Conclusion: Patients scanned with dobule low scan mode can obtain better image quality, and image quality is satisfactory for diagnosis, while obviously reducing patient radiation dose and the total iodine.