Aim To discuss the display value of the direct conformation of the cervical artery interlayer with the technique of monoenergetic⁺. Methods 43 cases of cervical artery interlayer, confirmed by CT angiography (CTA) and/or digital subtraction angiography (DSA), were collected. The dual energy CT non-enhanced imaging (DENECT) scan obtains data, using monoenergetic⁺ technique. DENECT uses χ² to display the rate of the direct image of the cervical artery. Its sensitivity, specificity, accuracy, positive predictive value and negative predictive value were tested by kappa. Results There were 43 cases confirmed by CTA and/or DSA, with 51 sites of 51 vessels. Among 43 cases of NECT images processed by monoenergetic⁺ technique, 16 cases clearly showed direct signs of the cervical artery interlayer and 27 were not clear. NECT showed significantly better than DSA (P<0.05) for the direct signs of the cervical artery interlayer. CTA showed better than DENECT for the display of vertebral artery interlayer (P<0.05), while DENECT showed no significant difference from CTA for the display of carotid and vertebral carotid artery (P>0.05), which positive predictive value and negative predictive value reached more than 61%, with the accuracy of 66% above. Conclusion monoenergetic⁺ technique provides a new method for emergency screening of artery interlayer.