100 KVP行肝脏三期CT增强扫描的可行性研究

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

目的：探讨100 KVP行肝脏三期增强扫描的可行性。方法将临床疑诊肝脏病变、体质量指数（BMI）在20～25 kg/m2之间的60例患者按照入院前后顺序随机分为两组，每组30例。低剂量组采用管电压为100 KVP，管电流自动调制技术（峰值600 mA），50% ASIR；常规剂量组采用管电流120 KVP，250 mA，FBP重建算法（0% ASIR）。对比剂用量及流速均采用个性化给药（350 mgI/ml）方案。所有患者均行肝脏三期扫描，记录有效辐射剂量（ED）值。对比两组图像主观及客观图像质量及辐射剂量。结果两组患者一般资料、CT 图像噪声值以及图像质量评分之间差异无统计学意义（P〉0.05）。低剂量组三期增强的有效辐射剂量为3.06 mSv较常规剂量组的3.69 mSv低，对比差异有显著统计学意义（P〈0.05）。结论对于BMI在22～25 kg/m2之间的患者，采用100 KVP低剂量扫描模式行肝脏三期增强扫描，可以有效降低辐射剂量，并可获得满足临床诊断需要的图像质量。

ObjectiveTo 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＆#39; 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.