Ultrasound Beam Formation and Pulsers

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What is the primary function of the beam former in ultrasound technology?

Applying electronic delays to align the phases of returning echoes (correct)

Translating signal information into a data format for 2D image display

Performing postprocessing filtering of noise and clutter

Generating the electric voltage to produce the acoustic signal

What is the purpose of the pulser in an ultrasound machine?

To generate the electric voltage to produce the acoustic signal (correct)

To perform postprocessing filtering of noise and clutter

To translate signal information into a data format for 2D image display

To apply electronic delays to align the phases of returning echoes

What is the result of the beam former's alignment of phases from individual transducer elements?

A filtered signal with reduced noise and clutter

A 2D image display on a video monitor

An output signal representing the acoustic information from a pulsed ultrasound beam (correct)

Electric voltage applied to the piezoelectric elements

What is the role of the transducer elements in the beam forming process?

To receive the echoes returning from the acoustic signal (A) Signup and view all the answers

What is the purpose of the electronic delays applied by the beam former?

To align the phases of the echoes returning from individual transducer elements (B) Signup and view all the answers

What is the relationship between the transducer elements and the output signal in beam forming?

The output signal is created by summing the realigned signals from all the transducer elements (C) Signup and view all the answers

What is the purpose of the pulse generator in an ultrasound machine?

To generate electrical pulses for the transducer (C) Signup and view all the answers

What is the function of the piezoelectric material in an ultrasound transducer?

To convert electrical pulses into acoustic energy (B) Signup and view all the answers

What determines the brightness of a cell in the ultrasound image?

The strength of the echo (A) Signup and view all the answers

What type of transducer has piezoelectric crystals set in a line across the transducer face?

Linear Array (D) Signup and view all the answers

What is the purpose of the transducer in an ultrasound machine?

To convert electrical pulses into acoustic energy (C) Signup and view all the answers

What is an example of a synthetic piezoelectric material?

Polyvinylidene difluoride (PVDF) (A) Signup and view all the answers

What is the primary function of the microphone in a hearing aid?

To convert sound waves into electrical signals (C) Signup and view all the answers

What is the approximate upper audible limit of human hearing in healthy, young adults?

20 kHz (A) Signup and view all the answers

What is the main application of ultrasound devices in medicine?

Ultrasound imaging or sonography (D) Signup and view all the answers

What is the primary use of ultrasound in industrial settings?

To detect invisible flaws in products (D) Signup and view all the answers

What is the Doppler effect a change in?

Frequency or wavelength of a wave (B) Signup and view all the answers

What is the frequency range of ultrasound devices?

From 20 kHz to several gigahertz (C) Signup and view all the answers