ARDMS SPI STUDY GUIDE 2025 With
Correct Answers
In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... - correct answer Remain
d d d d d d d d d d d d d d d d d d d d
the Same because stiffness and density affect Propagation Speed.
d d d d d d d d
What is the audible range? - correct answer 20-20,000Hz
d d d d d d d d
>20,000Hz=Ultrasound
Frequency is measured in - correct answer Hertz (Hz) d d d d d d d d
is d
Cycles per Second d d
Not affected by sonographer
d d d d
Increase Frequency; Decrease Depth d d d
A period is the length of time it takes for - correct answer one complete wavelength to pass a fixed point
d d d d d d d d d d d d d d d d d d d d
PRP is determined by - correct answer Transmit time and receive time.
d d d d d d d d d d d
,Period is measured in - correct answer Time (μs)
d d d d d d d d
When the sonographer changes the imaging depth what parameters are changed? - correct answer PRP, PRF,
d d d d d d d d d d d d d d d d
Duty Factor d
What is duty factor? - correct answer The percentage or fraction of time that the system is transmitting a pulse
d d d d d d d d d d d d d d d d d d d d
(Time Sound is ON or ON-Time).
d d d d d
Propagation Speed in SOFT TISSUE - correct answer 1.54 mm/μs d d d d d d d d d
(1540 m/sec) d
Unit of measurement for Pulse Duration, Duty Factor, PRP, and Period - correct answer Time, (μs)
d d d d d d d d d d d d d d d
Pulse duration is determined by - correct answer Sound Source Only
d d d d d d d d d d
Pulse Duration is controlled by - correct answer the ultrasound system and transducer
d d d d d d d d d d d d
Pulse Duration Formula - correct answer pulse duration (μs) = # cycles in pulse/frequency(MHz)
d d d d d d d d d d d d d
PD= Number of cycles in Pulse/ Frequency(Hz)
d d d d d d
Spatial Pulse Length (SPL) (measurement) - correct answer The distance that a pulse occupies in space from
d d d d d d d d d d d d d d d d d
the start to the end of a pulse.
d d d d d d d d
(mm)
Typical values for spatial pulse length in soft tissue. - correct answer 0.1 to 1.0 mm
d d d d d d d d d d d d d d d
Spatial pulse length is determined by - correct answer sound source and medium
d d d d d d d d d d d d
, Spatial Pulse Length is directly proportional to - correct answer the Number of Cycles in the Pulse
d d d d d d d d d d d d d d d d
and d
the Wavelength
d
(Directly Proportional means that increased SPL will increase both the number of cycles in the pulse and the
d d d d d d d d d d d d d d d d d d
wavelength if increased). d d
Spatial pulse length is inversely proportional to - correct answer Frequency (MHz)
d d d d d d d d d d d
(Inversely Proportional means that increased SPL will lower frequency. This is because axial resolution is
d d d d d d d d d d d d d d d
better with lower frequency)
d d d
Pulse Duration (PD) - correct answer The actual time from the start of a pulse to the end of that pulse; a single
d d d d d d d d d d d d d d d d d d d d d d d
transmit, talking, or "on" time. d d d d d
Time the pulse is on typically measured in (ms).
d d d d d d d d
Pulse Length - correct answer The distance of the pulse start to end or the
d d d d d d d d d d d d d d
duration or length of a single pulse
d d d d d d d
Pulse Length is typically measured in (mm).
d d d d d d
the ability of an object to resist compression and relates to the hardness of a medium? - correct answer
d d d d d d d d d d d d d d d d d d d
Stiffness. d
Think:
↑ Stiffness ↑ Speed
d d d
↓ Density ↑ Speed
d d d
An increase in pulse repetition frequency would lead to: - correct answer Increasing pulse repetition
d d d d d d d d d d d d d d d
frequency, increases duty factor. d d d
Correct Answers
In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... - correct answer Remain
d d d d d d d d d d d d d d d d d d d d
the Same because stiffness and density affect Propagation Speed.
d d d d d d d d
What is the audible range? - correct answer 20-20,000Hz
d d d d d d d d
>20,000Hz=Ultrasound
Frequency is measured in - correct answer Hertz (Hz) d d d d d d d d
is d
Cycles per Second d d
Not affected by sonographer
d d d d
Increase Frequency; Decrease Depth d d d
A period is the length of time it takes for - correct answer one complete wavelength to pass a fixed point
d d d d d d d d d d d d d d d d d d d d
PRP is determined by - correct answer Transmit time and receive time.
d d d d d d d d d d d
,Period is measured in - correct answer Time (μs)
d d d d d d d d
When the sonographer changes the imaging depth what parameters are changed? - correct answer PRP, PRF,
d d d d d d d d d d d d d d d d
Duty Factor d
What is duty factor? - correct answer The percentage or fraction of time that the system is transmitting a pulse
d d d d d d d d d d d d d d d d d d d d
(Time Sound is ON or ON-Time).
d d d d d
Propagation Speed in SOFT TISSUE - correct answer 1.54 mm/μs d d d d d d d d d
(1540 m/sec) d
Unit of measurement for Pulse Duration, Duty Factor, PRP, and Period - correct answer Time, (μs)
d d d d d d d d d d d d d d d
Pulse duration is determined by - correct answer Sound Source Only
d d d d d d d d d d
Pulse Duration is controlled by - correct answer the ultrasound system and transducer
d d d d d d d d d d d d
Pulse Duration Formula - correct answer pulse duration (μs) = # cycles in pulse/frequency(MHz)
d d d d d d d d d d d d d
PD= Number of cycles in Pulse/ Frequency(Hz)
d d d d d d
Spatial Pulse Length (SPL) (measurement) - correct answer The distance that a pulse occupies in space from
d d d d d d d d d d d d d d d d d
the start to the end of a pulse.
d d d d d d d d
(mm)
Typical values for spatial pulse length in soft tissue. - correct answer 0.1 to 1.0 mm
d d d d d d d d d d d d d d d
Spatial pulse length is determined by - correct answer sound source and medium
d d d d d d d d d d d d
, Spatial Pulse Length is directly proportional to - correct answer the Number of Cycles in the Pulse
d d d d d d d d d d d d d d d d
and d
the Wavelength
d
(Directly Proportional means that increased SPL will increase both the number of cycles in the pulse and the
d d d d d d d d d d d d d d d d d d
wavelength if increased). d d
Spatial pulse length is inversely proportional to - correct answer Frequency (MHz)
d d d d d d d d d d d
(Inversely Proportional means that increased SPL will lower frequency. This is because axial resolution is
d d d d d d d d d d d d d d d
better with lower frequency)
d d d
Pulse Duration (PD) - correct answer The actual time from the start of a pulse to the end of that pulse; a single
d d d d d d d d d d d d d d d d d d d d d d d
transmit, talking, or "on" time. d d d d d
Time the pulse is on typically measured in (ms).
d d d d d d d d
Pulse Length - correct answer The distance of the pulse start to end or the
d d d d d d d d d d d d d d
duration or length of a single pulse
d d d d d d d
Pulse Length is typically measured in (mm).
d d d d d d
the ability of an object to resist compression and relates to the hardness of a medium? - correct answer
d d d d d d d d d d d d d d d d d d d
Stiffness. d
Think:
↑ Stiffness ↑ Speed
d d d
↓ Density ↑ Speed
d d d
An increase in pulse repetition frequency would lead to: - correct answer Increasing pulse repetition
d d d d d d d d d d d d d d d
frequency, increases duty factor. d d d
