Specifications And Parts Name; Principles Of Operation - Hitachi ASU-1014 Instruction Manual

2. Specifications and Parts name

2-1. Principles of operation

This scanner and the ultrasound diagnostic instrument enable image diagnosis using ultrasonic waves. These
instruments operate under the principles described below.
(1) When an electric pulse signal is applied from the transmitter to the transducer of the scanner, the
transducer operates by converting electrical vibrations to mechanical vibration energy for emitting pulse-
shaped ultrasonic waves into the body part contacting the transducer or into liquid or other medium.
(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 vibrations and uses an electro-mechanical conversion operation to
convert the received mechanical vibrations to electric energy. The received echo is also converted to
electric signals and a brightness modulation operation is used to convert the electric pulses to shades of
brightness for forming an image.
(4) The transducer is moved mechanically to enable changing of the scanning surface for sliced images.
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MN1-5933 Rev.5