ARDMS Ultrasound Physics & Instrumentation Exam questions with verified detailed solutions

ARDMS Ultrasound Physics & Instrumentation Exam || || || || || ||




questions with verified detailed solutions || || || ||




Which of the following is defined as only the active time? - correct answer✔✔Pulse
|| || || || || || || || || || || || || ||




duration



The inertia of the medium describes its: - correct answer✔✔Density
|| || || || || || || || ||




Which of the following is determined by the sound source only? - correct
|| || || || || || || || || || || || ||




answer✔✔Frequency



The prefix "centi" denotes: - correct answer✔✔Hundredths
|| || || || || ||




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 answer✔✔>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 answer✔✔Refraction ||




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 answer✔✔millimeters per microsecond (mm/μs)
|| || || ||

, The major component of attenuation is: - correct answer✔✔Pulse repetition frequency
|| || || || || || || || || ||




In clinical imaging, the wavelength measures between: - correct answer✔✔0.1 to 0.8 mm
|| || || || || || || || || || || ||




The duty factor for continuous wave ultrasound is: - correct answer✔✔100%
|| || || || || || || || || ||




All of the following relate to the strength of the sound wave except: - correct
|| || || || || || || || || || || || || || ||




answer✔✔Wavelength



What is the change in intensity if the power decreases by half? - correct answer✔✔Intensity
|| || || || || || || || || || || || || ||




is halved
|| ||




Damping of the sound beam: - correct answer✔✔Reduces the spatial pulse length
|| || || || || || || || || || ||




What is defined as the ability of the ultrasound system to image structures that are
|| || || || || || || || || || || || || || ||




positioned parallel to the sound beam as separate structures? - correct answer✔✔Axial
|| || || || || || || || || || || ||




resolution



What is defined as the beginning of one pulse to the beginning of the next pulse, and
|| || || || || || || || || || || || || || || || ||




therefore includes both the "on" and "off" time? - correct answer✔✔Pulse repetition period
|| || || || || || || || || || || ||




The pulse repetition period is the time from the start of one pulse to the start of the next
|| || || || || || || || || || || || || || || || || || ||




pulse, and therefore, it includes the "on" (or transmit) and "off" (or listening) times
|| || || || || || || || || || || || ||




What is pressure measured in? - correct answer✔✔pascals or pounds per square inch
|| || || || || || || || || || || ||




What is essentially equal to the power of a wave divided by the area over which the power is
|| || || || || || || || || || || || || || || || || ||




distributed? - correct answer✔✔Intensity
|| || || ||