Abstract: The advantages of 640-slice volume CT were used to image carotid, cerebral and coronary arteries in one scan, to examine the image quality of combined cardio-cerebrovascular imaging and the radiation dose received by patients, and to exploreit's further value in clinical application. We studied 20 patients with combined cardiac and brain imaging (group 1), 20 patients with coronary CTA scan (group 2), and 20 patients with conventional carotid-cerebral vascular CTA (group 3). They were prospectively ECG-gated, and each group was measured separately the ascending aorta root, bilateral carotid arteries, internal carotid arteries and middle cerebral arteries M1 image CT value and image noise. The images were evaluated by 4-point method for coronary artery images and 3-point method for cervical-cerebrovascular images. The coronary artery images were evaluated by the 4-point method and the cervical-cerebrovascular images were evaluated by the 3-point method. The radiation dose received by patients in each group after scanning was recorded respectively.As a result,640-slice volume CT low-dose "one-stop" large-pitch cardio-cerebrovascular combined imaging can simultaneously provide coronary and carotid-cerebrovascular images that meet the needs of clinical diagnosis.We obtained 97.5% of coronary arterial images that meet the needs of diagnosis. There is no undiagnosable image in the neck-cerebrovascular image. The effective radiation exposure dose of combined cardio-cerebrovascular imaging is (3.99±0.37)mSv, and it is completely within the reasonable range acceptable to the patient, avoiding repeated CTA examinations. This can provide more information for clinical treatment at one time. It is therefore a simple, fast, non-invasive, low-contrast agent use, low exposure, objective and repeatable examination.

Key words: 640-slice volume CT, Coronary artery, Cervical-cerebrovascular, Combined imaging