S2/S2BW
Digital Color Doppler Ultrasound System
7.2.7 POWER
Power is the acoustic power of transducer.
Operate:
POWER
• Turn
AUDIO
, high-light “Power” item.
• Turn
MENU
key, to adjust Power level.
7.2.8 D GAIN
D Gain controls the sensitivity of color image, control the display of over all blood signals and noises.
Operate:
Turn D Gain to adjust the Gain of color image.
Higher Gain will improve blood signal while increasing noise.
Lower Gain will decrease blood signal and noise.
Note
• Gain value is displayed on the screen.
7.2.9 PRF
PRF controls the highest blood velocity the system can recognize. The higher PRF is, the higher speed the
system can display. The PRF range of S2 is 1.0 kHz to 24.0 kHz. But different exam modes and different
transducers have different PRF range.
Operate:
Turn switch up to increase PRF value.
Turn switch down to decrease PRF value.
Note
•
When scanning different organs, you should choose approporiate PRF according to
the flow speed in this organ.
•
Low PRF may cause aliasing, e.g. the top part of the spectrum will be displayed in
the bottom; too high PRF will reduce the peaks of the spectrum, and make it hard to
discern.
7.2.10 STEER
For linear transducers, you can steer the scanning beam when in active scanning, to adjust the angle between
blood flow and ultrasound beam, to increase the accuracy of blood display. You can have
−
◦
,
−
◦
,
−
◦
,
◦
, +
◦
, +
◦
, +
◦
, 7 different angles.
Operate:
P/N: 4710.00149A01
7-4
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