Abstract: Objective To evaluate the influence of the CT enterography (CTE) in different scan phases of small intesti⁃ nal wall and arteriovenous vessels, and to confirm the diagnostic efficiency thereof. Methods A total of 286 patients under⁃ went CTE were collected, and their CT image of three scan phases, including 20 s, 40 s and 60 s after injection, were record⁃ ed. Values of reinforcement of the intestinal wall and arteriovenous enhancing degree in all phases were collected. A statisti⁃ cal analysis was used to confirm the best phase for showing the structure. The diagnostic efficiency of the best phase of CT image was evaluated for the clinical diagnosis of small intestine and vascular lesions. Results (1) The CT value of the small intestinal wall in the intestinal phase was significantly higher than other two phases (P＜0.05). There was no significant dif⁃ ference in CT value between arterial phase and portal phase. (2) Comparison between three phases of CT values of ileum showed that artery: arterial phase>intestinal phase, and there is no statistical difference between the intestinal phase and oth⁃ er two phases. The result of CT value of ileum vein showed that intestinal phase＞portal phase＞arterial phase (P＜0.05). (3) The sensitivity was 95.8%, the specificity was 94.9%, the accuracy was 95.1%, the positive predictive value was 79.3% and the negative predictive value was 99.1% using CT image of intestinal period for diagnosing small intestinal diseases. (4) The intestinal period showed small intestinal lesions and confirmed by pathology including 22 cases of small intestinal lympho⁃ ma, 10 cases of stromal tumor, 1 case adenoma, cavernous 3 cases hemangioma and 8 cases of Crohn's disease. The diagno⁃ sis of hemangioma should be combined with arterial phase. Conclusion Small intestinal wall and blood vessels have better display performance in the intestinal phase of multiphase CT enterography, using the arterial phase and intestinal phase scan⁃ ning, we can make an accurate diagnosis for the majority of small intestinal diseases.

Key words: intestinal diseases, tomography, X-ray computed, diagnosis, multislice CT enterography