UniSA Module 6 exam 2023 with correct answers

The Doppler shift frequency is directly proportional to the velocity of the reflector If the media boundary is moving toward the source, the reflected sound wave will have higher frequency than the incident frequency If the media boundary is moving away from the source, the result will be lower frequency than incident frequency Continuous wave Doppler uses how many piezoelectric elements 2 The greatest Doppler angle is achieved When the beam strikes the vessel at 30 degree angle A Fourier transform of a returning echo will result in a presentation of the ____ contained within the echo frequencies The Doppler shift frequency is zero when the angle between the receiving transducer amd the flow direction is 90 degrees Continuous wave ultrasound is used in Some Doppler systems The Doppler effect occurs To all waves coming from a moving source The Doppler effect depends on The closing velocity between transducer and tissue, carrier frequency and ultrasound propagation velocity The pulsed-Doppler system yields better depth resolution than the the continuous wave system True What is the following formula used to determine? 2 x velocity of reflection x original frequency/velocity of sound Shift in frequency due to the Doppler effect Continuous wave Doppler has a duty factor of 100% An instrument used to detect frequency shift is called Doppler The mode not applicable to a Doppler instrument is static A disadvantage of pulses wave Doppler relative to continuous wave Doppler is that It is subject to 'aliasing' Continuous wave ultrasound is Used in some Doppler instruments Which imaging modality is audible? Doppler