1 – 8 HS40 Service Manual
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 by digital memory and computer when they
convert 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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