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ARDMS SPI EXAM 2 2024/2025 PRACTICE QUESTIONS AND ANSWERS GRADED A+
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ARDMS SPI EXAM 2 2024/2025 PRACTICE QUESTIONS AND ANSWERS GRADED A+
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ARDMS SPI EXAM 2 2024/2025 PRACTICEQUESTIONS AND ANSWERS GRADED A+
In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will...
Remain the Same because stiffness and density affect Propagation Speed.
What is the audible range?
20-20,000Hz
>20,000Hz=Ultrasound
Frequency is measured in
Hertz (Hz)
is
Cycles per Second
Not affected by sonographer
,Increase Frequency; Decrease Depth
A period is the length of time it takes for
one complete wavelength to pass a fixed point
PRP is determined by
Transmit time and receive time.
Period is measured in
Time (μs)
When the sonographer changes the imaging depth what parameters are changed?
PRP, PRF, Duty Factor
What is duty factor?
The percentage or fraction of time that the system is transmitting a pulse (Time Sound is ON or
ON-Time).
Propagation Speed in SOFT TISSUE
,1.54 mm/μs
(1540 m/sec)
Unit of measurement for Pulse Duration, Duty Factor, PRP, and Period
Time, (μs)
Pulse duration is determined by
Sound Source Only
Pulse Duration is controlled by
the ultrasound system and transducer
Pulse Duration Formula
pulse duration (μs) = # cycles in pulse/frequency(MHz)
PD= Number of cycles in Pulse/ Frequency(Hz)
Spatial Pulse Length (SPL) (measurement)
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.
0.1 to 1.0 mm
Spatial pulse length is determined by
sound source and medium
Spatial Pulse Length is directly proportional to
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
Frequency (MHz)
(Inversely Proportional means that increased SPL will lower frequency. This is because axial
resolution is better with lower frequency)
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