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Physics Doppler quiz questions and answers 2024 solved

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What information does the Doppler shift furnish concerning the blood cells that produce it? - Ans - velocity The frequency of a pulsed Doppler wave is 6 MHz, and the PRF is 5 kHz. What is the maximum Doppler shift that can be recorded without aliasing? - Ans - 2.5 kHz When a reflector moves toward the transducer, what will happen to the reflected frequency? - Ans - increase Which of the following is not include in the information that is processed by a standard duplex ultrasound system? - Ans - attenuation What is the sign indicator of the Doppler shift frequency if a reflector approaches the transducer at constant velocity? - Ans - positive Aliasing occurs when the reflected frequency exceeds ________ the Nyquist limit. - Ans - 1/2 What is the main limitation of pulsed wave Doppler? - Ans - aliasing What occurs as the Doppler angle is increased? - Ans - It decreases the frequency shift What is a feature of continuous wave Doppler? - Ans - No upper velocity limit for moving reflectors The Doppler effect is observed as a change in _____ and has units of ______. - Ans - frequency, per second What is the smallest number of crystals a PW Doppler device may have? - Ans - 1 If the interrogation angle is increased from 45° to 90°, what will happen to the measured velocity of the blood flow? - Ans - It will be zero. What is observed if a reflector approaches the transducer at constant velocity? - Ans - Echo frequency is higher than transmit frequency What is the artifactual display of a high-frequency Doppler shift at a frequency lower than the true value? - Ans - aliasing Which of the following is not related to continuous wave Doppler transducers? - Ans - wide bandwidth

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