ARDMS SPI STUDY GUIDE EXAM QUESTIONS WITH 100% COMPLETE SOLUTIONS
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Course
ARDMS SPI
Institution
ARDMS SPI
ARDMS SPI STUDY GUIDE EXAM QUESTIONS WITH 100% COMPLETE SOLUTIONS
In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... - ANSWER- Remain the Same because stiffness and density affect Propagation Speed.
What is the audible range? - ANSWER- 20-20,000Hz
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ARDMS SPI STUDY GUIDE EXAM
QUESTIONS WITH 100% COMPLETE
SOLUTIONS
In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will...
- ANSWER- Remain the Same because stiffness and density affect Propagation Speed.
What is the audible range? - ANSWER- 20-20,000Hz
>20,000Hz=Ultrasound
Frequency is measured in - ANSWER- Hertz (Hz)
is
Cycles per Second
Not affected by sonographer
Increase Frequency; Decrease Depth
A period is the length of time it takes for - ANSWER- one complete wavelength to pass
a fixed point
PRP is determined by - ANSWER- Transmit time and receive time.
Period is measured in - ANSWER- Time (μs)
When the sonographer changes the imaging depth what parameters are changed? -
ANSWER- PRP, PRF, Duty Factor
What is duty factor? - ANSWER- The percentage or fraction of time that the system is
transmitting a pulse (Time Sound is ON or ON-Time).
Unit of measurement for Pulse Duration, Duty Factor, PRP, and Period - ANSWER-
Time, (μs)
Pulse duration is determined by - ANSWER- Sound Source Only
Pulse Duration is controlled by - ANSWER- the ultrasound system and transducer
, Pulse Duration Formula - ANSWER- pulse duration (μs) = # cycles in
pulse/frequency(MHz)
PD= Number of cycles in Pulse/ Frequency(Hz)
Spatial Pulse Length (SPL) (measurement) - ANSWER- The distance that a pulse
occupies in space from the start to the end of a pulse.
(mm)
Typical values for spatial pulse length in soft tissue. - ANSWER- 0.1 to 1.0 mm
Spatial pulse length is determined by - ANSWER- sound source and medium
Spatial Pulse Length is directly proportional to - ANSWER- the Number of Cycles in the
Pulse
and
the Wavelength
(Directly Proportional means that increased SPL will increase both the number of cycles
in the pulse and the wavelength if increased).
Spatial pulse length is inversely proportional to - ANSWER- Frequency (MHz)
(Inversely Proportional means that increased SPL will lower frequency. This is because
axial resolution is better with lower frequency)
Pulse Duration (PD) - ANSWER- The actual time from the start of a pulse to the end of
that pulse; a single transmit, talking, or "on" time.
Time the pulse is on typically measured in (ms).
Pulse Length - ANSWER- The distance of the pulse start to end or the
duration or length of a single pulse
Pulse Length is typically measured in (mm).
the ability of an object to resist compression and relates to the hardness of a medium? -
ANSWER- Stiffness.
Think:
↑ Stiffness ↑ Speed
↓ Density ↑ Speed
An increase in pulse repetition frequency would lead to: - ANSWER- Increasing pulse
repetition frequency, increases duty factor.
↑ PRF ↑ Duty Factor
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