目的通过与全视野数字化乳腺X线摄影(Full Field Digital Mammography,FFDM)对比,探讨数字乳腺断层重建的合成二维图像(Synthetic Mammography,SM)在诊断乳腺良恶性病变中的应用价值。方法回顾性分析我院153例乳腺良、恶性病变患者的FFD...目的通过与全视野数字化乳腺X线摄影(Full Field Digital Mammography,FFDM)对比,探讨数字乳腺断层重建的合成二维图像(Synthetic Mammography,SM)在诊断乳腺良恶性病变中的应用价值。方法回顾性分析我院153例乳腺良、恶性病变患者的FFDM与SM图像,比较2组图像病变可见性评级、影像征象、BI-RADS分类及平均腺体剂量,以病理结果为“金标准”,ROC曲线评估2组图像诊断效能。结果FFDM与SM病变可见性评级存在统计学差异,SM病变显示略优于FFDM(Z=-3.130,P=0.002);2组图像显示乳腺病变影像征象一致性较好,Kappa值为0.827~0.900;FFDM与SM诊断乳腺良恶性病变的曲线下面积分别为0.847(95CI%:0.774~0.921)和0.861(95CI%:0.789~0.933),差异无统计学意义(Z=-1.347,P=0.178);FFDM与SM的平均腺体剂量差异有统计学意义(P<0.001),SM+DBT平均腺体剂量相比FDM+DBT降低约45%(3.29/6.01)。结论SM与FFDM在乳腺良恶性病变诊断中的应用价值相当,SM可替代FFDM作为二维图像与DBT联合应用于乳腺病变检查,且没有增加辐射剂量。展开更多
In this paper,we investigate the existence of symmetric solutions of singular nonlocal boundary value problems for systems of differential equations.Our analysis relies on a nonlinear alternative of Leray-schauder typ...In this paper,we investigate the existence of symmetric solutions of singular nonlocal boundary value problems for systems of differential equations.Our analysis relies on a nonlinear alternative of Leray-schauder type.Our results presented here unify,generalize and significantly improve many known results in the literature.展开更多
文摘目的通过与全视野数字化乳腺X线摄影(Full Field Digital Mammography,FFDM)对比,探讨数字乳腺断层重建的合成二维图像(Synthetic Mammography,SM)在诊断乳腺良恶性病变中的应用价值。方法回顾性分析我院153例乳腺良、恶性病变患者的FFDM与SM图像,比较2组图像病变可见性评级、影像征象、BI-RADS分类及平均腺体剂量,以病理结果为“金标准”,ROC曲线评估2组图像诊断效能。结果FFDM与SM病变可见性评级存在统计学差异,SM病变显示略优于FFDM(Z=-3.130,P=0.002);2组图像显示乳腺病变影像征象一致性较好,Kappa值为0.827~0.900;FFDM与SM诊断乳腺良恶性病变的曲线下面积分别为0.847(95CI%:0.774~0.921)和0.861(95CI%:0.789~0.933),差异无统计学意义(Z=-1.347,P=0.178);FFDM与SM的平均腺体剂量差异有统计学意义(P<0.001),SM+DBT平均腺体剂量相比FDM+DBT降低约45%(3.29/6.01)。结论SM与FFDM在乳腺良恶性病变诊断中的应用价值相当,SM可替代FFDM作为二维图像与DBT联合应用于乳腺病变检查,且没有增加辐射剂量。
基金Supported by the National Natural Science Foundation of China(10771117)the Foundation of School of Mathematics and System Science,Shandong University(306001)
文摘In this paper,we investigate the existence of symmetric solutions of singular nonlocal boundary value problems for systems of differential equations.Our analysis relies on a nonlinear alternative of Leray-schauder type.Our results presented here unify,generalize and significantly improve many known results in the literature.