2 - 8 HS70A Service Manual
Image Area
Displays ultrasound images, TGC, image information, annotation, and measurement
information are also displayed.
Thumbnail Area
Up to five saved images are displayed. (Save by pressing the Save button.) When you
save Single screens, up to 5 images are shown in a list; for Quad screens, up to 16
images are shown. Clicking with the pointer will enlarge the selected thumbnail in the
Image area. At the top of the Thumbnail area, you can see the total number of images
saved.
User Information Area
Information that is useful to the user, such as current system status, image information,
selectable items, etc., is displayed.
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.
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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