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③ Image Area
Displays ultrasound images, TGC, image information, annotation, and measurement
information are also displayed.
④ Thumbnail Area
Images saved by selecting Save are displayed as thumbnails. If saving Single screens, up
to 5 images are shown in a list; for Quad screens, up to 16 images are displayed. Clicking
with the pointer will enlarge the selected thumbnail in the Image area.
⑤ User Information Area
Information that is useful to the user, such as current system status, image information,
selectable items, etc., is displayed.
⑥ User Defined Key Area
Settings for User Defined Keys, including the positions of Set and Exit, are displayed.
You can change the setting of each button in Setup > User Defined Key.
NOTE
For information on User Key Setup, please refer to 'Chapter 3.
Utilities'.
TIP Principles of Operation of the Diagnostic Ultrasound System
Medical ultrasound images are created when the computer's digital memory
converts the high-frequency wave signals that are transmitted and received by the
probe.
As ultrasound waves propagate through the human body, they generate reflected
signals whenever they encounter a change in density. For example, reflected
signals are generated when signals pass from fatty tissues to muscle tissues.
Reflected signals return to the probe where they are converted into electronic
signals. The reflected signals are amplified and processed by analog and digital
circuits that have filters for various frequencies and response time options. Then
they are again converted into high-frequency electronic signals, and saved as a
series of digital image signals. The monitor displays the image signals stored on
the storage device in real time.
The entire process of transmitting, receiving, and processing signals is controlled
by the computer.
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