CVS 200- EXAM 1 LATEST
Transverse waves move in a direction that is perpendicular/
longitudinal to the sound beam's main axis:
Perpendicular (angle of 90° to a given line)
Transverse waves move in a direction that is perpendicular to the main
axis of the sound beam.
in contrast, longitudinal waves move in a direction that is parallel to the
sound beam's main axis. Ultrasound waves used in medical imaging are
longitudinal waves, where the particle motion is parallel to the direction
of wave propagation.
If I begin an exam using a 2.0 MHz transducer and the next exam
requires using a 7.0 MHz transducer what happens to my period?
It decreases
As you can see, when the frequency increases from 2.0 MHz to 7.0
MHz, the period decreases.
Therefore, using a higher frequency transducer results in a shorter period
for the ultrasound wave.
Know how density and stiffness affect the sonographic appearance
and the speeds of sound:
Example: Stiffness increases speed and has an echogenic reflection
In ultrasound imaging, the sonographic appearance of tissues and the
speed of sound within them are influenced by their density and stiffness
(elasticity)
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1
, CVS 200- EXAM 1 LATEST
Denser tissues reflect more ultrasound waves, resulting in brighter
images and faster sound speed.
Less dense tissues, like blood or cystic structures, reflect fewer waves,
resulting in darker areas and slower sound speed.
Know the ranges of audible sound (human)and the two different
ways to write the ranges
20Hz-20KHz
or
20Hz to 20,000Hz
Hertz (Hz)
unit of frequency/1 cycle per second.
It measures how many times a periodic event occurs per second.
Kilohertz (kHz):
is a unit of frequency equal to 1,000 (Hz).
It represents 1,000 cycles per second. The term is often used to describe
frequencies in the range of thousands of hertz
1 kilohertz is equal to 1,000 hertz.
Megahertz (MHz):
1 megahertz is equal to 1,000,000 Hz
mega=million
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PAGE
2
Transverse waves move in a direction that is perpendicular/
longitudinal to the sound beam's main axis:
Perpendicular (angle of 90° to a given line)
Transverse waves move in a direction that is perpendicular to the main
axis of the sound beam.
in contrast, longitudinal waves move in a direction that is parallel to the
sound beam's main axis. Ultrasound waves used in medical imaging are
longitudinal waves, where the particle motion is parallel to the direction
of wave propagation.
If I begin an exam using a 2.0 MHz transducer and the next exam
requires using a 7.0 MHz transducer what happens to my period?
It decreases
As you can see, when the frequency increases from 2.0 MHz to 7.0
MHz, the period decreases.
Therefore, using a higher frequency transducer results in a shorter period
for the ultrasound wave.
Know how density and stiffness affect the sonographic appearance
and the speeds of sound:
Example: Stiffness increases speed and has an echogenic reflection
In ultrasound imaging, the sonographic appearance of tissues and the
speed of sound within them are influenced by their density and stiffness
(elasticity)
END OF
PAGE
1
, CVS 200- EXAM 1 LATEST
Denser tissues reflect more ultrasound waves, resulting in brighter
images and faster sound speed.
Less dense tissues, like blood or cystic structures, reflect fewer waves,
resulting in darker areas and slower sound speed.
Know the ranges of audible sound (human)and the two different
ways to write the ranges
20Hz-20KHz
or
20Hz to 20,000Hz
Hertz (Hz)
unit of frequency/1 cycle per second.
It measures how many times a periodic event occurs per second.
Kilohertz (kHz):
is a unit of frequency equal to 1,000 (Hz).
It represents 1,000 cycles per second. The term is often used to describe
frequencies in the range of thousands of hertz
1 kilohertz is equal to 1,000 hertz.
Megahertz (MHz):
1 megahertz is equal to 1,000,000 Hz
mega=million
END OF
PAGE
2
