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Unformatted text preview: EE 480/580 Biomedical Electronics Homework #2 Name: Ankulkumar Prabhubhai Oganja Person Number: 36920169 Graduate Student Que1. What is used in CT scan: A. Sound waves B. Optical waves C. X-rays D. Magnetic field E. Microwaves Ans1. X-Rays are used in CT Scan. Que2. What is Doppler effect? What are the advantages of Doppler Ultrasound compared to the conventional one? Ans2. The Doppler Effect is the change in frequency of a wave for an observer moving relative to the source of the wave. If the source is moving towards the observer or vice versa than the frequency of receiving wave increases and it decreases for other case. For waves that propagate in a medium, such as sound waves, the velocity of the observer and that of the source are relative to the medium in which the waves are transmitted. The total Doppler effect may therefore result from motion of the source, motion of the observer, or motion of the medium. Each of these effects is analyzed separately. For waves which do not require a medium, such as light or gravity in general relativity , only the relative difference in velocity between the observer and the source needs to be considered. Doppler ultrasound is a noninvasive test that can be used to measure the blood flow and blood pressure by bouncing high-frequency sound waves (ultrasound) off red blood cells. A regular ultrasound uses sound waves to produce images, but can't show blood flow. A Doppler ultrasound can estimate how fast blood flows by measuring the rate of change in its pitch (frequency). A Doppler ultrasound test uses reflected sound waves to evaluate blood as it flows through a blood vessel. It helps doctors evaluate blood flow through the major arteries and veins of the arms, legs, and neck. It can show blocked or reduced blood flow through narrowing in the major arteries of the neck that could cause a stroke. It also can reveal blood clots in leg veins (deep vein thrombosis, or DVT) that could break loose and block blood flow to the lungs (pulmonary embolism)....
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This note was uploaded on 02/24/2011 for the course EE 580 taught by Professor Dr.natalialitchinister during the Spring '11 term at SUNY Buffalo.
- Spring '11