ARDMS SPI STUDY GUIDE, Questions pool with answers, 100% Accurate, rated A+.
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ARDMS SPI
ARDMS SPI STUDY GUIDE, Questions
pool with answers, 100% Accurate, rated
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,...
if the frequency of a wave is increased the propagation speed ps will remain the same because sti
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ARDMS SPI STUDY GUIDE, Questions
pool with answers, 100% Accurate, rated
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)
Pulse Duration (PD) - ✔✔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 - ✔✔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? - ✔✔Stiffness.
Think:
↑ Stiffness ↑ Speed
↓ Density ↑ Speed
An increase in pulse repetition frequency would lead to: - ✔✔Increasing pulse repetition frequency,
increases duty factor.
↑ PRF ↑ Duty Factor
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