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2024 ARDMS ULTRASOUND PHYSICS & INSTRUMENTATION PRACTICE EXAM WITH CORRECT ANSWERS
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2024 ARDMS ULTRASOUND PHYSICS & INSTRUMENTATION PRACTICE EXAM WITH CORRECT ANSWERS
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2024 ARDMS ULTRASOUNDPHYSICS & INSTRUMENTATION
PRACTICE EXAM WITH CORRECT
ANSWERS
Which of the following is defined as only the active time? - CORRECT-
ANSWERSPulse duration
The inertia of the medium describes its: - CORRECT-ANSWERSDensity
Which of the following is determined by the sound source only? - CORRECT-
ANSWERSFrequency
The prefix "centi" denotes: - CORRECT-ANSWERSHundredths
Micro denotes: - CORRECT-ANSWERSMillionth
Which of the following is described as the distance over which one cycle
occurs? - CORRECT-ANSWERSWavelength
Wavelength is distance over which one cycle occurs, or the distance from the
beginning of one cycle to the end of the same cycle.
All of the following are true of stiffness except: - CORRECT-ANSWERSStiffness
and propagation speed are indirectly associated
Stiffness and propagation speed are directly related: the stiffer the medium,
the faster the propagation speed.
Areas of high pressure and density are referred to as: - CORRECT-
ANSWERSCompressions
Spatial pulse length can be calculated by: - CORRECT-ANSWERSMultiplying
the number of cycles times the wavelength
Density is typically measured in: - CORRECT-ANSWERSKilograms per
centimeter cubed
As a sound wave travels through the human body, the intensity of the sound
wave decreases as a result of: - CORRECT-ANSWERSAttenuation
Absorption
, Scattering
Attenuation is a decrease in the amplitude, power, and intensity of the sound
beam as sound travels through tissue. There are three mechanisms of
attenuation: absorption, reflection, and scattering.
What is the total amount of attenuation that occurs if a 6.0-MHz sound beam
travels through 4 cm of soft tissue? - CORRECT-ANSWERS12 dB
As imaging depth increases, pulse repetition period: - CORRECT-
ANSWERSIncreases
If pulse repetition frequency increases, then the duty factor: - CORRECT-
ANSWERSIncreases
The percentage of time that the ultrasound system is producing pulses of
ultrasound describes the: - CORRECT-ANSWERSDuty factor
Density and propagation speed are: - CORRECT-ANSWERSInversely related
All of the following are true of power except: - CORRECT-ANSWERSAs
amplitude increases, power remains the same
All of the following are true of wavelength except: - CORRECT-ANSWERSIt is
equal to the period divided by the frequency
Which of the following is determined by the sound source and medium? -
CORRECT-ANSWERSWavelength
Which of the following is defined as the number of ultrasound pulses emitted
in 1 second? - CORRECT-ANSWERSPulse repetition frequency
If the angle of incidence is 40°, what is the angle of transmission at the
interface if medium 1 has a propagation speed of 1320 m/s and medium 2
has a propagation speed of 1700 m/s? - CORRECT-ANSWERS>40°
The change in the direction of the original sound wave that occurs when
sound interacts with two different tissue types that have a different
propagation speed is referred to as: - CORRECT-ANSWERSRefraction
Refraction is the change in direction of the transmitted sound beam that
occurs with oblique incidence and dissimilar propagation speeds.
Which of the following is an appropriate unit of measurement for propagation
speed? - CORRECT-ANSWERSmillimeters per microsecond (mm/μs)
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