Specifications

404 VisualSonics Vevo 2100 Imaging System Operator Manual Rev 1.1
Appendix B: Troubleshooting
Problem Solution
Lack of penetration or sensitivity
 Increase the Transmit Power.
 Ensure that there is adequate coupling medium (for example,
ultrasound gel) between the transducer and the animal.
 Adjust the position of the TGC sliders.
 Ensure the appropriate transducer is being used.
Contrast Mode
Problem Solution
Contrast Mode functions are not
available
 Ensure that Contrast Mode is the active mode.
The green in the contrast overlay is
not displayed where expected
 The reference data set should be one that doesn't have
bubbles (created either before the contrast agent is injected or
after a destroy function). The reference data set must be the
darker data set (in other words, it should be the data with the
least amount of material in the blood stream.)
The amount of green in the contrast
overlay is too much or too little
 Ensure that the Contrast setting is appropriate before creating
the reference loop. To do this, create a temporary reference
loop, and process it against itself (i.e., against the same
reference loop). There should be no green in the processed
image. If there is, adjust the Contrast setting and repeat.
Physiological data
Problem Solution
No ECG signal is displayed
 Ensure the ECG cable is connected to the physiological
monitoring and control system, and the keyed end of the cable
is connected to the front panel of the Vevo cart.
ECG signal appears flatlined
 Ensure that the ECG monitor is producing a strong, consistent
signal.
ECG signal is poor
 Ensure that all of the animal’s limbs are secured to the ECG
pads on animal platform.
 Ensure that no gel has leaked onto any of the contacts on the
animal platform.
 Ensure that there is no 50/60 Hz noise source near the animal
platform (for example a lamp or a power cable).