专业英语10.ppt

Exercises 1、 It turns out that the subtle variations in these physical parameters, which can be displayed as an image, are the result of biological changes which in turn reflect the difference between normal and diseased tissues. 2、There have to be corrected before meaningful superimposition can be performed, and the mathematics of these corrections is far from trivial, particularly when we recall that the two images may appear quite different with few common points of reference. 结果是：这些能作为一幅图像来显示的物理参数极细微的变化，是生物学改变的结果，这些改变依次反映了正常与病变组织的差异。 （这些差异）必须在进行有意义的影像重叠之前得到修正，这些修正的数学方法绝不是没有意义的，特别是当两幅图像由于很少有共同的参考点而显示出完全不同的时候。 x-ray imaging attenuation electromagnetic radiation equation intensity a slab of material of thickness d coefficient calcium phosphate in contrast to muscle tissue illustrate differentiate chemical composition artery enhance antiarrhythmic administration prevention physiological/psychology viral hepatitis epidemiology reliability check against obtain from prognosis nephritis water-soluble vitamin fat-soluble vitamin division ill-health intensive care unit pus surgeon/physician morbidity schedule Probing the body with Doppler ultrasound?用多普勒超声探查身体 1.The Doppler effect has been understood since the middle of the 19th century when it was predicted theoretically and then demonstrated by using observers having ‘perfect pitch’ listening to notes played on a moving train. It initially found application in astronomy when it was observed that distant galaxies exhibited a shift of spectral lines towards the red, indicating that they were moving away from us at high velocities. This observation lead to the hypothesis of the expanding universe and the ‘Big Bang’ theory. More recently this fundamental physical principle has been applied to the measurement of the velocities of tissues hidden in the body using diagnostic ultrasound. perfect pitch：音高辨别力，强乐感 astronomy：天文学 galaxies：星系 多普勒效应在19世纪中叶就被人们发现，当时首先在理论上被预言，接着又让