Description of the System
3.1.3 Bioeffects
One distinguishes between two acting mechanisms for the development of Bioeffects when exposing
the human body to ultrasound waves: Heat Generation and Cavitation.
Heat generation: the ultrasound energy is absorbed by the tissue and warms it up, the amount of heat
depending on the absorbed power and duration of exposure. A part of the heat is dissipated into the
blood stream.
Cavitation: due to a strong negative pressure gas bubbles appear. The permanent change between gas
and liquid phase constitute strong local mechanical stress in the tissue. The degree of cavitation is
influenced by the gas content and the superficial tension of the tissue resp. of body fluid.
3.2 Mechanical
Design
3.2.1 System
Configuration
MONITOR
rotate – and inclinable
CONTROL CONSOLE
rotatable
Touchpanel Display
Probe Holder
Loudspeaker
Place for different disk drives
Place for Printer and VCR
Standby switch
Probe connector module
Foot rest
Voluson
®
730 - Instruction Manual
3-4
105838 Rev. 3
