SPI ULTRASOUND REGISTRY REVIEW Questions and Answers (100% Pass)
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Course
SPI
Institution
SPI
SPL
wavelength x # of cycles
With phased array transducers, the transmitted sound beam is steered by
Varying the timing of pulses to the individual piezoelectric elements
What type of wave is sound?
mechanical and longitudinal
The Frequency ranges for Ultrasound are:
> 20,000 Hz (20kH...
✓ Decrease by one half/ Frequency and wavelength are inversely
related
What happened to intensity if the amplitude of a signal is halve?
✓ Quarted/ Intensity is proportional to the amplitude squared, so if the
amplitude is halved, the resulting intensity is one fourth the original
intensity
Duty factor
✓ is the percentage of the time the sound is being transmitted
A 3dB gain would indicated in intensity by:
✓ 2 times (A gain of 3dB results in doubling of intensity (or power))
Ignoring the effects of attenuation, the intensity of ultrasound beam is usually
greater at the focal zone because of:
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