Feasibility study of CT enhanced 100 KVP scan on liver tri-phase enhancement

Objective To explore the feasibility of 100 KVP on liver tri-phase enhancement scan. Methods A total of 60 patients whose BMI from 20 - 25 kg/m2 with suspected liver disease underwent tri-phase enhanced CT scans divided into two groups randomly, and each group includes 30 cases. Low dose group were scanned with 100 KVP and auto modulation tube current(peak current 600 mA). CT image raw data sets were reconstructed with ASIR composite at 50%. Normal dose group were scanned with 120 KVP and 250 mA. CT image raw data sets were reconstructed with FBP. Contrast medium injection rate and volume were personalized by patients' weight (350 mgI/ml). The effective radiation dose (ED) of each patient was calculated. Image quality evaluation was assessed objectively and subjectively. Results There was no statistically significant difference in subjective and objective image quality between the two groups (P>0.05). Patients in low dose group suffered an average effective radiation dose which was obviously lower than that normal dose group (3.06 mSv vs 3.69 mSv, P<0.05). Conclusion Those BMI from 20 - 25 kg/m2 underwent liver tri-phase enhancement with 100 KVP may obtain better image quality and less than radiation dose, and could got the image quality to meet the needs of clinical diagnosis. Key words: Tomography; X-ray computed; Abdominal scanning; Low dose