Understanding ultrasound physics ch 17 Exam Study Guide
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Terms in this set (53)
harmonic frequency? twice the fuhdamental frequency (second harmonic frequency)
fundamental frequency? the frequency of sound created by the transducer and transmitted into the
body.
transducer transmits a sound pulse 4 MHz
with a frequency of 2 MHz.. what
about in harmonic mode?
harmonic frequency sound waves nonlinear behavior
arise from?
harmonic frequency waves less distortion than fundamental sound waves
undergo?
two important forms of tissue harmonics
harmonics that are in important contrast harmonics
in diagnostic sonography?
linear means? proportional or symmetrical
nonlinear? irregular or disproportional or uneven
sound wave is a series of compressions and rarefactions
at slightly uneven speeds through soft tissue, faster through
sound travels ...
compressions and slower through rarefactions.
The nonlinear variations in speed tissue harmonics in the biologic media
creates?
the strength of the harmonic TRUE
waves grows as sound travels
in the tissue?
, During fundamental imaging, the beam is very strong
significant amounts of artifacts the many different superficial anatomic layers distort the sound beam.
arise within the few
centimeters of tissue. They appear
for two reasons:
tissue harmonic signals do not TRUE
exist at
extremely superficial depths : they
develop deeper in the tissue
harmonic get a free ride through TRUE
superficial tissues thereby
remaining distortion free with
less noise.
Harmonics increase? signal to noise ratio
with tissue harmonic the nonlinear
relationship between sound
beam strength and harmonic
creation is also
since the main beam is strong harmonics are produced along the main beam.
beams that are most likely to are least likely to create artifacts.
create harmonics...
-not present as sound leaves the transducer; they are created deeper in the
tissue.
Tissue harmonics are : -created in the tissues during transmission
-created by nonlinear behavior in the speed of sound
-primarily created along the beam's main axis
what do pulse inversion harmonics clear up and improve harmonic signal; eliminate distorted fundamental
do? reflections.
creates images from the portion of the reflected sound that has
Fundamental imaging:
the same frequency as the transmitted sound.
pulse inversion harmonics: separate the harmonics from the fundamental frequencies more successful
with pulse inversion harmonics: two consecutive ultrasound pulses are transmitted down each line
wherever a compression exists a rarefaction exists in the second.
in the first pulse
harmonics = construct
fundamental= destruct
Questions with Correct Answers 2025 latest update!! Already
Graded A+
Terms in this set (53)
harmonic frequency? twice the fuhdamental frequency (second harmonic frequency)
fundamental frequency? the frequency of sound created by the transducer and transmitted into the
body.
transducer transmits a sound pulse 4 MHz
with a frequency of 2 MHz.. what
about in harmonic mode?
harmonic frequency sound waves nonlinear behavior
arise from?
harmonic frequency waves less distortion than fundamental sound waves
undergo?
two important forms of tissue harmonics
harmonics that are in important contrast harmonics
in diagnostic sonography?
linear means? proportional or symmetrical
nonlinear? irregular or disproportional or uneven
sound wave is a series of compressions and rarefactions
at slightly uneven speeds through soft tissue, faster through
sound travels ...
compressions and slower through rarefactions.
The nonlinear variations in speed tissue harmonics in the biologic media
creates?
the strength of the harmonic TRUE
waves grows as sound travels
in the tissue?
, During fundamental imaging, the beam is very strong
significant amounts of artifacts the many different superficial anatomic layers distort the sound beam.
arise within the few
centimeters of tissue. They appear
for two reasons:
tissue harmonic signals do not TRUE
exist at
extremely superficial depths : they
develop deeper in the tissue
harmonic get a free ride through TRUE
superficial tissues thereby
remaining distortion free with
less noise.
Harmonics increase? signal to noise ratio
with tissue harmonic the nonlinear
relationship between sound
beam strength and harmonic
creation is also
since the main beam is strong harmonics are produced along the main beam.
beams that are most likely to are least likely to create artifacts.
create harmonics...
-not present as sound leaves the transducer; they are created deeper in the
tissue.
Tissue harmonics are : -created in the tissues during transmission
-created by nonlinear behavior in the speed of sound
-primarily created along the beam's main axis
what do pulse inversion harmonics clear up and improve harmonic signal; eliminate distorted fundamental
do? reflections.
creates images from the portion of the reflected sound that has
Fundamental imaging:
the same frequency as the transmitted sound.
pulse inversion harmonics: separate the harmonics from the fundamental frequencies more successful
with pulse inversion harmonics: two consecutive ultrasound pulses are transmitted down each line
wherever a compression exists a rarefaction exists in the second.
in the first pulse
harmonics = construct
fundamental= destruct
