Siemens ACUSON Antares, Инструкция по эксплуатации

Страница: 35 / 230

2 S a f e t y a n d C a r e
[ 1 ] I N S T R U C T I O N S F O R U S E
2 - 13
Transmit Power Control
Adjust the transmit power and the corresponding acoustic pressure
delivered through the transducer to the patient by using the designated
control on the ultrasound system. It is the main system function that
determines the transmitted intensity of ultrasound for all transducers and
imaging modes during real-time imaging, though it is not the only function
that affects the mechanical and thermal indices. The range and especially
the maximum level of the mechanical and thermal indices differs depending
on the transducers. In addition, each diagnostic exam type has preset values
for mechanical and thermal indices.
Note: Maximum transmit acoustic intensity and the mechanical index for each exam type
is limited in accordance with the United States Food and Drug Administration's (FDA)
recommendations and guidelines. System default transmit intensity and mechanical index
values are always below the FDA recommendations for each exam type. Although some
exam types may default to a condition of maximum allowable transmit power, there are
other system controls or functions that could raise acoustic output levels.
To increase the transmit power:
To increase the transmit power, rotate the TRANSMIT POWER control
clockwise.
To decrease the transmit power:
To decrease the transmit power, rotate the TRANSMIT POWER control
counterclockwise.
Transmit Power Display
The transmit power range is from 0% to 100%. Selecting 100%, in
combination with other ultrasound system controls or functions, generates
the maximum acoustic intensity and mechanical index for each transducer,
where:
I
SPTA.3
:
≤
720 mW/cm
2
and MI
≤
1.9
xxx xxxx
Example of the location of transmit power display on the image screen.
[1] Instructions for Use
Functions Affecting
Acoustic Output 2-14
System Reference
System Presets Ch 3
System Reference
System Presets Ch 3