Cirs Doppler String Phantom 043, User Manual, Page: 7 / 32

4
Setting up the Clamp
The Doppler String Phantom is shipped with a scanhead clamp system con-
sisting of a clamp
(see Figure 3) , an "arm" with a center joint and an arm at-
tachment fixture, which is bolted to the tank. If your Doppler String Phantom
was shipped in a custom carrying case, the clamp will have been set up at the
factory and you should skip step 1.
1. The arm attachment fixture on the tank has two sockets.
Insert one end of the arm into either of the sockets and tighten the
thumbscrew.
2. Turn the clamp adjusting knob to open or close the clamp so that it
fits your scanhead.
3. Adjust the clamp and articulated arm so that the transducer end of the
scanhead is in the water.
(See Figure 4). Make sure your scanhead is at the
desired angle with respect to the string.
Note: Although the scanhead clamp can be placed in water temporarily, it should
be stored in a dry location to prevent corrosion.
Figure 3: Scanhead Clamp
Clamp
Adjusting
Knob
About Velocity Corrected
Fluid:
The speed of sound is 1480
meters per second in water
and 1540 meters per second
in the human body. Doppler
scanners are calibrated for
1540 meters per second, so
some ultrasound profession-
als prefer to use a water/gly-
col mix that also has a speed
of sound of 1540 meters per
second. This mix is called
velocity corrected fluid.
The Doppler String Phantom
has been designed to work
with either plain water or
velocity-corrected fluid (H2O/
Glycol). When you turn on
the power, the Doppler String
Phantom will ask you which
type of fluid you are using.
When set for use with water,
the Doppler String Phantom
compensates for the different
speed of sound by adjust-
ing the speed of the string
and the display indicates the
speed your scanner should
be detecting. When set for
use with velocity-corrected
fluid, the Doppler String Phan-
tom moves the string at the
actual speed indicated on the
display.