Hitachi VC34A Probe, Инструкция по эксплуатации

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-1- Q1E-EP1398
1. General
1.1 General
The model VC34A Probe is a convex array electronic scanning type.
The probe is capable of acquiring Real-time 3D image by mechanical
drive of the acoustic elements.
The acoustic output was measured with operating the Hitachi
Ultrasound diagnostic scanner according to IEC60601-2-37. The
measured acoustic output is listed in the instruction manual of the
Hitachi ultrasound scanner.
The probe is categorized in class IIa according to Directive
93/42/EEC and classified as type BF according to IEC60601-1.
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.
1)
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.
2) The emitted ultrasonic waves are reflected by boundaries with
different acoustic characteristics (acoustic impedance) within
the body.
3) 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.