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b413s3-answersf07-2

b413s3-answersf07-2 - BME-413 Fall 2007 Study Helps for...

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BME-413 Fall 2007 Study Helps for Review Questions Set #3 1. What is the advantage of an ICD over conventional defibrillation? Lower energy to defibrillate; automated response. 2. Explain how ultrasound pulse-echo imaging works. What physical ultrasound quantity does the image show? (see external links section) 3. If the speed of sound in tissue were increased what effect would this have on the appearance of the ultrasound image in terms of depth perspective? The image would look compressed in the depth direction. 4. What materials in the human body most block ultrasound and prevent imaging? Air, bone 5. What is Doppler ultrasound imaging? How is it used and why is it useful? Use of the frequency shift of the ultrasound due to motion in the body. 6. Define the following terms: reflection coefficient, acoustic impedance, acoustic attenuation, echo, pulse repetition rate, raster scanning, ultrasound linear array. (see external links) 7.
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