256层CT冠状动脉成像中优化对比剂注射技术对图像质量的影响

THE EVALUATION OF IMAGE QUALITY USING OPTIMIZED LOW-DOSE CONTRAST INJECTION PROTOCOLS ON 256-SLICE SPIRAL CT CORONARY ANGIOGRAPHY

目的比较依据患者体重选择对比剂用量和在前者用量基础上减少10ml的优化对比剂注射技术对冠状动脉造影图像质量的影响。方法将接受CT冠状动脉造影检查的95例患者随即分为A组和B组,对比剂为碘普罗胺(370mg/ml)。A组根据患者体重选择对比剂用量(1.0ml/kg),B组的对比剂用量在A组用量基础上减去10ml。选择冠状动脉不同节段处测量对比剂增强水平。统计分析二组的图像质量、对比剂用量和冠状动脉对比剂增强水平。结果 A组和B组条件下的图像质量评分分别为4.57±0.13和4.49±0.12,差异无统计学意义(P>0.05)。右冠状动脉中段、左冠状动脉中段和左旋支中段对比剂平均增强水平差异无统计学意义。对比剂用量存在统计学意义(P<0.05),它们分别为(69.90±9.37)ml和(59.57±7.52)ml。结论与依据患者体重选择对比剂用量相比,在此基础上再减少10ml的优化对比剂注射技术可以获得令人满意的图像,减少对比剂用量。

Objective To compare the effect of a dose tailored to patient＇s body weight injection protocol and a dose was subtracted 10ml on the basis count of that injection protocol on 256 - slice spiral CT in coronary artery angiography. Methods Ninety - five patients who underwent CT coronary angiography were randomly divided into group A and group B. Ultravist Solution（370mgI/ml） was used as contrast media. In group A, a does tailored to the patient＇s body weight（1.0ml/kg）. In group B, the contrast media does was subtracted 10ml on the basis count of group A, when the mean enhancement of ROI choosen in descending aorta（DO） was got to the threshold preset value, he computer started a scanning. The mean cardiac artery enhancement was measured. Statistical t - test analysis on image quality score, enhancement and close of contrast material was performed. Results The mean image quality scores of group A and group B were 4.57 ± 0.13 and 4.49 ± 0.12, respectively, there was no statistically difference （P〉0.05）. The enhancement of RCAm, LADm and LCXm in group A and group B showed significant statistical difference. The mean dose of contrast material in group A（69.90 ± 9.37ml） and group B（59.57 ± 7.52ml） showed statistical difference. Conclusion Compared with the dose tailored to patient＇s body weight injection protocol, the contrast media does was subtracted 10ml on that basis count injection protocol can .provide satisfactory qual- ity, and has reduce contrast material injection dose.