Samsung ACCUVIX XG Manual do Utilizador Página 63

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Chapter 2 Introduction
Tips!
Principles of Operation
Medical ultrasound images are created by computer and digital memory from the transmission
and reception of mechanical high-frequency waves applied through a probe. The mechanical
ultrasound waves spread through the body, producing an echo where density changes occur.
For example, in the case of tissue, an echo is created where a signal passes from an adipose tissue
region to a muscular tissue region. The echoes return to the probe where they are converted back
into electrical signals.
These echo signals are highly amplified and processed by analog and digital circuits having filters
with many frequency and time response options, transforming the high-frequency electrical signals
into a series of digital image signals which are stored in memory. Once in memory, the image can
be displayed in real-time on the image monitor. All signal transmission, reception and processing
characteristics are controlled by computer.
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