1
SPI ULTRASOUND REGISTRY REVIEW Questions and
Answers (100% Pass) 2025
SPL - (answer)wavelength x # of cycles
With phased array transducers, the transmitted sound beam is steered by -
(answer)Varying the timing of pulses to the individual piezoelectric elements
What type of wave is sound? - (answer)mechanical and longitudinal
The Frequency ranges for Ultrasound are: - (answer)> 20,000 Hz (20kHz)
The speed of sound in soft tissue is: - (answer)1540 m/s
Linear sequence Array - (answer)transducer that fires the elements in groups
Unit for Wavelength - (answer)is millimeters
Enhancement is caused by - (answer)weakly attenuating structures (such as a
cyst)
, 2
The wavelength in a material having a propagation speed of 1.5 mm/us
employing a transducer frequency of 5.0 MHz is: - (answer)0.3 mm
Wavelength= c/f = 1.5mm/us ÷ 5MHz = 0.3mm
An ultrasound transducer converts: - (answer)electrical energy into mechanical
energy and vice versa
The order of attenuation, from the lowest attenuation to highest: -
(answer)fat, muscle, bone, air
Propagation Speed from the lowest to highest: - (answer)air, fat, muscle, bone
If the frequency doubled, what to wavelength? - (answer)Decrease by one
half/ Frequency and wavelength are inversely related
What happened to intensity if the amplitude of a signal is halve? -
(answer)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 - (answer)is the percentage of the time the sound is being
transmitted
, 3
A 3dB gain would indicated in intensity by: - (answer)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: - (answer)The smaller beam diameter
(Intensity equals power divided by area. The area is smallest in the focal zone;
therefore, the intensity is highest)
Attenuation denotes: - (answer)is the weakening of the strength of the beam,
typically from absorption, reflection, or scattering
SATA - (answer)is the lowest of the intensities
Beam Uniformity Ratio - (answer)BUR= SP/SA
Continuous Wave Doppler has a duty factor of: - (answer)100%
SPL - (answer)The spatial pulse length is defined as the product of the
wavelength and the number of cycles in a pulse (SPL= wavelength time the
number of cycles in the pulse)
SPTP - (answer)highest intensity
SPI ULTRASOUND REGISTRY REVIEW Questions and
Answers (100% Pass) 2025
SPL - (answer)wavelength x # of cycles
With phased array transducers, the transmitted sound beam is steered by -
(answer)Varying the timing of pulses to the individual piezoelectric elements
What type of wave is sound? - (answer)mechanical and longitudinal
The Frequency ranges for Ultrasound are: - (answer)> 20,000 Hz (20kHz)
The speed of sound in soft tissue is: - (answer)1540 m/s
Linear sequence Array - (answer)transducer that fires the elements in groups
Unit for Wavelength - (answer)is millimeters
Enhancement is caused by - (answer)weakly attenuating structures (such as a
cyst)
, 2
The wavelength in a material having a propagation speed of 1.5 mm/us
employing a transducer frequency of 5.0 MHz is: - (answer)0.3 mm
Wavelength= c/f = 1.5mm/us ÷ 5MHz = 0.3mm
An ultrasound transducer converts: - (answer)electrical energy into mechanical
energy and vice versa
The order of attenuation, from the lowest attenuation to highest: -
(answer)fat, muscle, bone, air
Propagation Speed from the lowest to highest: - (answer)air, fat, muscle, bone
If the frequency doubled, what to wavelength? - (answer)Decrease by one
half/ Frequency and wavelength are inversely related
What happened to intensity if the amplitude of a signal is halve? -
(answer)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 - (answer)is the percentage of the time the sound is being
transmitted
, 3
A 3dB gain would indicated in intensity by: - (answer)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: - (answer)The smaller beam diameter
(Intensity equals power divided by area. The area is smallest in the focal zone;
therefore, the intensity is highest)
Attenuation denotes: - (answer)is the weakening of the strength of the beam,
typically from absorption, reflection, or scattering
SATA - (answer)is the lowest of the intensities
Beam Uniformity Ratio - (answer)BUR= SP/SA
Continuous Wave Doppler has a duty factor of: - (answer)100%
SPL - (answer)The spatial pulse length is defined as the product of the
wavelength and the number of cycles in a pulse (SPL= wavelength time the
number of cycles in the pulse)
SPTP - (answer)highest intensity
