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ARDMS SPI STUDY GUIDE, Questions pool with answers, 100% Accurate, rated A+.
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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,...

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  • February 3, 2023
  • 22
  • 2022/2023
  • Exam (elaborations)
  • Questions & answers

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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 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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