ARDMS Ultrasound Physics & Instrumentation
Practice Exam | 2024 Questions & Answers |
100% Correct | Verified
Which of the following is defined as only the active time? - Pulse duration
The inertia of the medium describes its: - Density
Which of the following is determined by the sound source ...
ARDMS Ultrasound Physics & Instrumentation
Practice Exam | 2024 Questions & Answers |
100% Correct | Verified
Which of the following is defined as only the active time? - ✔✔Pulse duration
The inertia of the medium describes its: - ✔✔Density
Which of the following is determined by the sound source only? - ✔✔Frequency
The prefix "centi" denotes: - ✔✔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? - ✔✔>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: - ✔✔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? - ✔✔millimeters
per microsecond (mm/μs)
The major component of attenuation is: - ✔✔Pulse repetition frequency
In clinical imaging, the wavelength measures between: - ✔✔0.1 to 0.8 mm
The duty factor for continuous wave ultrasound is: - ✔✔100%
, All of the following relate to the strength of the sound wave except: - ✔✔Wavelength
What is the change in intensity if the power decreases by half? - ✔✔Intensity is halved
Damping of the sound beam: - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔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? - ✔✔Intensity
Transducers have material within them that, when electronically stimulated, produces ultrasound waves.
This is most likely some form of: - ✔✔Lead zirconate titanate
What is the change in power if the amplitude triples? - ✔✔It increases nine times
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? - ✔✔Rarefaction
Rarefaction is an area in the sound wave where the molecules are spread wider apart.
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