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探讨二维超声联合四维彩超超高细微分辨血流技术(HD-flow)彩色血流显像在产前诊断先天性心脏发育异常中的临床应用价值。方法 选取2016年7月至2018年2月在小榄人民医院行产前超声检查并分娩的单胎妊娠孕妇2 200例，先对所有入组的孕妇进行二维超声检查，二维超声检查提示胎儿疑似宫内心脏发育异常的孕妇再联合应用四维彩超HD-flow彩色血流显像进行检查。将进行二维超声的检查结果作为对照组，将二维...
Acoustic geometry for general relativistic barotropic irrotational fluid flow
acoustic spacetime relativistic fluid flow barotropic irrotational
2010/3/17
"Acoustic spacetimes", in which techniques of differential geometry are used to investigate sound propagation in moving fluids, have attracted considerable attention over the last few decades. Most o...