Introduction; General; Principles Of Operation - Hitachi L44 Instruction Manual

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1.1 General

L44 Probe is a linear array probe.
The acoustic output of L44 Probe was measured according to the
IEC60601-2-37 standard and the measurement was conducted by
operating with the Hitachi ultrasound diagnostic scanner. The
measured acoustic output is listed in the instruction manual of
the Hitachi ultrasound diagnostic scanner.
L44 Probe is categorized in class IIa according to
Directive 93/42/EEC and classified as type BF according to IEC

1.2 Principles of operation

This probe and the ultrasound diagnostic scanner enable image
diagnosis using ultrasonic waves. This system operates under the
principles described below.
When an electric pulse signal is applied from the transmitter
to the transducer of the probe, the transducer converts
electric signals into mechanical vibration energy for emitting
pulse-shaped ultrasonic waves into the body part, liquid or
other medium contacting the transducer.
The emitted ultrasonic waves are reflected by boundaries with
different acoustic characteristics (acoustic impedance)
within the body.
The transducer is also used to receive reflected ultrasonic
waves. The transducer vibrates mechanically due to the received
ultrasonic waves and converts mechanical vibrations into
electric energy. Electric signals are converted to shades of
brightness by brightness modulation to obtain an image.
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