2. Ultrasound is an imaging method that uses
high-frequency sound waves to produce images
of structures within our body.
The ultrasonic image is an electronic
representation of data generated from
returning echoes and displayed on a monitor.
3. Ultrasound imaging, different modes are
used to examine the different parts of
our body. The different types of modes
can be controlled by the operator .
These are follows:
A MODE
M MODE
B MODE
4. Amplitude modulation.
Is the display of amplitude spikes of
different heights.
It represents the time required for the
ultrasound beam to strike a tissue
interface and return its signal to the
transducer.
The greater the reflection at the tissue
interface, the larger the signal amplitude
on the A-mode screen.
5. Consists of a x and y axis,
X represents the depth and y
represents the Amplitude
Depth
Amplitude
6. A mode is used in ophthalmology,
echoencephalography and echocardiology.
Used as an adjunct to B mode displays
when accurate depth measurements are
required.
7. No memory is built
Discards previous pulses as it receives
new ones
Permanent record made by photographing
the electronic display
8. Motion Mode is also called Time Motion or
TM-Mode.
Is the display of a one-dimensional image
that is used for analyzing moving body
parts.
Spikes are converted into dots.
The single sound beam is transmitted and
the reflected echoes are displayed as dots
This mode allows to trace motion
10. ADVANTAGES:-
It is most useful in echocardiography and
fetal cardiac imaging.
DISADVANTAGES:-
• Only one dimension is represented
• Short time that can be recorded
11. B-mode means Brightness mode.
• Display of the 2D map.
• Display echo signal are electrically converted to intensity
modulated dots on the screen.
• Brightness depends upon the amplitude or intensity of the
echo.
• The B mode produces a picture of a slice of a tissue.
• B mode display is used both in generating M-mode trace and
in gray scale.
13. B-mode took a major step forward with the
advert of gray scale imaging in 1972.
Display the great variation of the amplitudes of
the echoes arising from tissues as varying
shades of gray on a monitor.
It was made by the development of scan
conversion memory tube called scan converter.
15. • Real Time imaging systems are those that
have frame rates fast enough to allow
movement to be followed.
• It can produce multiple frames in a very
short time, typically10 frames per second.
This allows movement to be viewed in
“real time” as the images are generated.
http://sonodriftzone.blogspot.in/2010/01/ultrasound-modes-b-m.html
moderate mitral stenosis (calcific) that shows evidence of multiple echoes of the anterior mitral leaflet.
Motion recorded over a period of time.
The display of the ultrasound echo amplitude or signal intensity as different shades of gray, improving image quality compared with the obsolete black-and-white presentation.
http://www.eimedical.com/blog/bid/76503/Ultrasound-Basics-How-to-read-an-ultrasound-image
FLUID is always BLACK and TISSUE is GRAY. The denser the tissue, is the brighter white it will appear in ultrasound the brightest white being bone.
the rapid acquisition and manipulation of ultrasound information from a scanning probe by electronic circuits to enable images to be produced on monitor almost instantaneously.