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Ultrasound Physics (SPI) Review Questions and Answers 100% Correct |
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Ultrasound Physics (SPI) Review Questionsand Answers 100% Correct | 2024-2025
Meaning of Anechoic? - ANSWER Dark, less echos.
Meaning of Echogenic? - ANSWER Full of echoes.
Meaning of Hyperechoic? - ANSWER More echoes than adjacent tissue.
Meaning of Hypoechoic? - ANSWER Less Echoes than adjacent tissue.
Meaning of Isoechoic? - ANSWER Similar/same echoes than adjacent tissue.
Meaning of Homogenous? - ANSWER Uniform Texture. (smooth)
Meaning of Heterogenous? - ANSWER Different levels of echogenicity.
Definition of Wavelength? - ANSWER The length of one cycle.
-Denoted by (Lamda)
Unit for Wavelength? - ANSWER m, cm, mm
Definition of Propagation Speed? - ANSWER The speed at which sound travels
through a medium
,Unit for Propagation Speed? - ANSWER m/s or mm/microseconds
Propagation Speed depends on? - ANSWER Density, Stiffness.
Definition of Density? - ANSWER Concentration of matter.
-Inversely related to prop speed.
Definition of Stiffness aka "Bulk Modulus"? - ANSWER The resistance of a
medium to compression.
-Stiffness is directly proportional to speed.
What are the two types of Ultrasound Waves? - ANSWER 1.) Electromagnetic -
Wave travels through a vacuum.
2.) Mechanical - Wave must travel through a medium.
What are two kinds of Mechanical Waves? - ANSWER A.) Transverse
B.) Longitudinal
Ultrasound images are made up of typically how many scan lines? - ANSWER
128 - 256 scan lines.
(more the better resolution)
Scanning format for Sector (shape)? - ANSWER Pie Shaped, Scan lines originate
from the same location and spread out as they travel.
,.
/\
/\
Scanning format for Modified Sector? - ANSWER Scan lines originate from
different points, but close together.
///\\\
/// \\\
Scanning format for Linear? - ANSWER Scan lines originate from different
points and travel parallel to each other. |||||||
|||||||
Definition of PRF? - ANSWER -Pulse Repetition Frequency
-The number of cycles per second. (including listening time)
Units for PRF? - ANSWER Hz, kHz, MHz
Formula for PRF? - ANSWER PRP=__1__
PRF
Definition of PRP? - ANSWER -Pulsed Repetition Period
-The time from the beginning of one pulse to the beginning of the next pulse.
, Units for PRP? - ANSWER s, ms, microseconds
Formula for PRP? - ANSWER PRP=__1__
PRF
Definition of Pulse Duration? - ANSWER The time the pulse is on.
Unit for Pulse Duration? - ANSWER Microseconds
Formula for Pulse Duration? - ANSWER PD = n x T
Definition of SPL? - ANSWER -Spatial Pulse Length
-The length of one pulse
Unit for SPL? - ANSWER mm
Formula for SPL? - ANSWER SPL = n x (lamda) aka Wavelength
Definition of Duty Factor? - ANSWER The percentage of time the pulse is on
-Unitless (just a number)
-For continuous wave, duty factor = 100%
-For pulsed wave, Duty Factor is less than 1%
Formula for Duty Factor? - ANSWER DF = __PD__
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