Mindray Resona 7, Руководство оператора

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Acoustic Output 15-3
15.4.2 MI/TI Display
TI and MI values are displayed in the upper part of the screen in real-time. The operator should monitor
these index values during examinations and ensure that exposure time and output values are
maintained at the minimum amounts needed for effective diagnosis.
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.
Real-time Display accuracy: MI
≤28.5%, TI≤38.7%
15.5 Acoustic Power Setting

Acoustic power adjustment
Rotate the [A.power] knob to adjust the acoustic power percentage, and its value is displayed on the
corresponding item, as well as at the top of 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.
The permissible level of intensity of ultrasound differs depending on the region of interest. For fetal
examinations, in particular, much care must be exercised.
In this system, imaging setups can be created using the ultrasound output set by you. Once you
perform preset settings, default setting values of the system may be changed and invalid. It
is the user’s responsibility for any change to the default settings.

Adjusting range
Initial power: 0.5% to 100%*
Definition of 100%: The maximum acoustic power of a probe determined by the increase in probe
surface temperature in the selected mode and the acoustic power restrictions specified by the FDA.
Default settings of acoustic power value refer to the best image quality of the probe. The larger the
acoustic power value, the better the image quality.
In the Resona 7 product, to obtain optimum images for applications under the requirements of safety
and ALARA principle, we set acoustic power default values in factory to be maximum 96.6% in all
exam modes for a better image quality. The user can make adjustments according to the imaging
effect in practical use.
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 OK or Cancel in the Setup menu). In the factory default settings, the Acoustic
Output is limited below 100%. 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: 2007, 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 Acoustic Output Indices on Diagnostic Ultrasound Equipment (AIUM and
NEMA UD-3 2004).