An ultrasound wave with a frequency of 4 MHz is reflected from blood cells in a blood vessel. A frequency decrease, Af, of -0.5 Hz is detected. The speed of ultrasound waves in blood is 1570 m/s. (a) Are the blood cells moving toward or away from the transducer? (b) Determine the relative speed of the blood within the blood vessels in the direction of the sensor? (c) If the transducer was transmitting ultrasound waves at an angle of theta with respect to the blood flow explain how this would affect the observed frequency shifts.

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Question 4 Ultrasound
An ultrasound wave with a frequency of 4 MHz is reflected from blood cells in a blood vessel.
A frequency decrease, Af, of -0.5 Hz is detected. The speed of ultrasound waves in blood is
1570 m/s.
(a) Are the blood cells moving toward or away from the transducer?
(b) Determine the relative speed of the blood within the blood vessels in the direction of
the sensor?
(c) If the transducer was transmitting ultrasound waves at an angle of theta with respect
to the blood flow explain how this would affect the observed frequency shifts.
(d) Comment on the effects on the ultrasound image quality and signal strength if the
transducer were to emit at a higher frequency e.g. 10MHz.
Transcribed Image Text:Question 4 Ultrasound An ultrasound wave with a frequency of 4 MHz is reflected from blood cells in a blood vessel. A frequency decrease, Af, of -0.5 Hz is detected. The speed of ultrasound waves in blood is 1570 m/s. (a) Are the blood cells moving toward or away from the transducer? (b) Determine the relative speed of the blood within the blood vessels in the direction of the sensor? (c) If the transducer was transmitting ultrasound waves at an angle of theta with respect to the blood flow explain how this would affect the observed frequency shifts. (d) Comment on the effects on the ultrasound image quality and signal strength if the transducer were to emit at a higher frequency e.g. 10MHz.
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