Radiology:放射科医生借助可变现辐射剂量和重建方法在检出肝转移的表现

2019-04-05 shaosai MedSci原创

本研究旨在评价降低剂量水平和迭代重建(IR)方法来显示能够被放射科医生诊断出肝转移的可行性。

本研究旨在评价降低剂量水平和迭代重建(IR)方法来显示能够被放射科医生诊断出肝转移的可行性。

本研究共纳入了83例行对比增强CT检查的患者。肝转移参照组织病理学分析或病情进展或转归。低辐射剂量配置重建在5个剂量水平联合反向滤过投影(FBP)和IR技术。3名腹部影像学医生评价肝转移,确定诊断信心和图像质量。利用jackknife ROC曲线(JAFROC)分析非劣性和阅片者一致性。

结果为,共有123处肝转移。利用JAFROC图像,100 QRM FBP并不能满足非劣性标准,与-0.08 (95% CI: -0.11, -0.04)常规剂量相比,诊断效果具有差异性。实现预置阅片者一致性规则并不能满足100 QRM IR或者80 QRM IR,但能够满足120 QRM以上水平。IR能够提高图像质量(P < .05),但并没提高阅片者诊断能力。除了160 QRM IR,降低剂量水平与诊断肝转移信心具有相关性(P < .001)。

本研究表, 对于对比增强CT诊断肝转移, 120以上质量参考mAs能够获得与200质量参考mAs联合滤过反向投影方法的效果。

原始出处:

Fletcher JG, Fidler JL, Venkatesh SK, Taylor JP,et al.Observer Performance with Varying Radiation Dose and Reconstruction Methods for Detection of Hepatic Metastases.Radiology.DOI:10.1148/radiol.2018180125

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    2019-04-07 jiyangfei
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