Clinical application of the technology of CTA with low-tube voltage and low-concentration contrast agent in lower extremity artery

Abstract

Objective To investigate the clinical application of the technology of CTA with low-tube voltage and low-concentration contrast agent in lower extremity artery. Methods 124 patients were randomly divided into three groups: conventional group (41 cases, 120 kV, 370 contrast agent 0.8 ml/kg), low-tube voltage group (42 cases, 100 kV, 370 contrast agent 0.8 ml/kg), low-tube voltage and low-concentration contrast agent group (41 cases, 100 kV, 300 contrast agent 0.8 ml/kg). Patients underwent helical scanning by PHILIPS iCT256CT, the patients' reconstructed image was evaluated, the radiation dose was compared. Results There were no statistically significant differences in the CT values among the three groups (P>0.05). The CT values of the three groups decreased with the decrease of the tube voltage and the concentration of the contrast agent, while there were no statistically significant differences among the three groups (P>0.05); the signal noise significantly increased, the signal to noise ratio and the contrast to noise ratio significantly decreased (P<0.05). Conclusion CTA examination with low-tube voltage and low-concentration contrast agent can reduce the radiation dose to the patients without affecting the image quality, which is an effective method for the examination and evaluation of the lower extremity CTA. Key words: Low tube voltage; Low concentration contrast agent; Lower extremity arterial CTA