Acoustic Output 14-3
You can set which TI item is to be displayed in the. Open the B/THI page in [Image Preset]
screen, and the acoustic output setups appear, as shown in the figure below:
Here you can set TIC, TIB or TIS to be displayed, as well as the level of acoustic power.
Generally speaking, when a cranial exam is performed, TIC is set to be displayed only.
NOTE: If there is a value of MI or TI exceeds 1.0, you must be careful to practice the
ALARA principle.
The display precision is 0.1.
14.5 Acoustic Power Setting
Acoustic power adjustment
Click [A. power] in the menu to adjust the acoustic power percentage, and the value is
displayed on the screen. The greater the acoustic power percentage, the greater the current
acoustic output.
When the image is frozen, the system stops transmitting acoustic power.
Default setting of acoustic power
Selection of diagnostic applications is the most important factor for controlling ultrasound
output.
In this system, imaging setups can be created using the ultrasound output set by you. At this
time, the default function is disabled. It is the user!s responsibility for any change to the
default settings.
Default choices
Initial power 10% to 100%*
* 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.
NOTE: This system automatically returns to the settings whenever changes are made to
the values (when you turn on the power, switch between probes, press [End Exam],
or select Return in the Setup menu). In the factory default settings, the Acoustic
Output is limited below settings. Following the ALARA restriction, you are allowed to
increase the acoustic power under FDA 510(k) Guidance-Track3 limits and to set it
in the image preset screen.
The acoustic output of the system has been measured and calculated in accordance with
IEC60601-2-37: 2005, FDA 510(K) GUIDANCE, Acoustic Output Measurement Standard for
Diagnostic Ultrasound Equipment (NEMA UD-2 2004) and the "Standard for Real-Time
Display of Thermal and Mechanical Indices on Diagnostic Ultrasound Equipment (AIUM and
NEMA UD-3 2004).
14.6 Acoustic Power Control
The qualified operator may use the system controls to limit the ultrasound output and to adjust
the quality of the images. There are three categories of system controls relative to output.
They are controls that have direct effect on the output, controls that indirectly control output
and controls that are receiver controls
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