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20.4 Operating Procedures for MI/TI
The control of ultrasound output and the most useful switches for this purpose are
described below.
(1) ACOUSTIC POWER knob
The output intensity is one of the available
ultrasound output control parameters. It
can be adjusted with the ACOUSTIC
POWER knob at the left end of the main
panel. To decrease ultrasound output, turn
the knob counterclockwise and to increase
ultrasound output, turn the knob clockwise.
(2) Setting the defaults for ACOUSTIC POWER
Selection of diagnostic applications is the most important factor for controlling
ultrasound output.
The permissible level of intensity of ultrasound differs depending on the region of
interest. For fetal examinations, in particular, much care must be exercised. For
this reason, the
patient, and the Preset menu must be used to select the settings appropriate for
each new region of interest.
This system allows defaults to be set for MI, TIS, TIB, and TIC using the preset
menu. The defaults automatically adjust the ACOUSTIC POWER level so that
MI, TIS, TIB, and TIC do not exceed their own settings at the time of power
ON,
* Definition of 100%:
The maximum acoustic power of a transducer determined by the
increase in transducer surface temperature in the selected mode and the
acoustic power restrictions specified by the FDA.
When 100% is set as the default setting value, the default function does not
operate.
Any changes to the default setting value are the responsibility of the user.
switch must be used to reset the parameters for each new
, switching of the transducer, and other initializations.
Default choices
Initial power
20% to 100%*
No. 2B730-973EN*D
20-4
Low
ACOUSTIC POWER
High
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