To Investigate the Application of Low-dose Contrast Agent Combined with Low Monitoring Threshold in CTA of the Head and Neck

Objective: To investigate the application of Philips Brilliance ICT with low-dose contrast agent combined with low monitoring threshold in CTA of the head and neck.Materials and Methods: Sixty patients requiring CTA of the head and neck in our hospital were selected and randomly divided into group A(observation group) and group B(experimental group), which received different injections and scanning scheme, respectively.A(observation group) contrast agent 60 mL, saline 40 mL, Monitoring Threshold 150 HU;B(experimental group) contrast agent 40 mL, saline 40 mL, Monitoring Threshold 90 HU;injection rate of both groups were 5.0 mL/s, monitoring the aortic arch.The images in the 2 groups were subjectively evaluated(visual observation) and objectively evaluated(the measurement of CT values of the superior vena cava, aortic arch, left and right common carotid artery, left and right middle cerebral artery), respectively, for the analysis of the quality of images.Results: (1) The subjective evaluation showed that all images in group A and group B could meet the diagnostic requirements.In group B, the contrast agent residue in the superior vena cava reduced significantly.(2) The scores of images quality in group A and group B presented no statistical significance(P>0.05).3.Comparison of the CT values of the superior vena cava, aortic arch, left and right common carotid artery, left and right middle cerebral artery between group A and group B showed statistical significance(P<0.05).Conclusion: Although the application of Philips Brilliance ICT with 40 ml of contrast agent combined with monitoring threshold of 90 HU in CTA of the head and neck shows differences in CT values of the images, the quality of the images can fully meet the clinical diagnostic requirements.In addition, with the quality of images ensured, the contrast agent dose and contrast agent residue in the superior vena cava are reduced.