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华西医学 2011

64层螺旋CT低剂量冠状动脉血管成像方案探讨

, PP. 18-21

袁元,李真林,邓莉萍,赵瑾

Keywords: 冠状动脉,64层螺旋CT,辐射剂量

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Abstract:

【】　目的　评价64层螺旋CT低剂量冠状动脉血管成像的价值。　方法　2009年1-6月157例患者随机分为3组，常规剂量组（A组）管电流量采用1000mAs，两个低剂量组（B、C组）分别采用800、600mAs。对3组的图像质量、噪声、CT剂量指数（CTDI）、剂量长度乘积（DLP）和有效剂量（ED）进行评估。　结果　A、B、C组图像噪声分别为20.50±3.23、23.02±3.05和26.28±2.58，组间差异均无统计学意义（P>0.05）；A、B、C组的CTDI分别为（58.7±0.23）、（46.98±2.27）、（35.28±3.56）mGy，DLP分别为（1050.88±89.63）、（846.21±57.86）、（641.13±32.15）mGy?cm，ED分别为（14.78±2.56）、（11.85±1.87）、（8.98±1.15）mSv，B、C组的CTDI、DLP、ED均明显低于常规剂量A组（P0.05).TheCTDIingroupA,BandCwere(58.7±0.23),(46.98±2.27),and(35.28±3.56)mGy,respectively;theDLPineachwere(1050.88±89.63),(846.21±57.86),and(641.13±32.15)mGy?cm,respectively;theEdwere(14.78±2.56),(11.85±1.87),and(8.98±1.15)mSv,respectively.AllofthedifferencesamongthethreegroupsinCTDI,DLPandEDwerestatisticallysignificant(P<0.05).　Conclusion　Theimagewith600mAsastubecurrentinthecoronaryarteryimagingof64-slicesmulti-detectorCTcouldfulfilltheneedofthediagnosis,andtheradiationdoseisapparentlylowerthantheconventionalscan.

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