Once the test injection
is complete, a separate filling valve is actuated to refill and restabilize the pressure in the fluid chamber before the next test cycle.
When the arthrography was performed under US-guidance, a test injection
of 2 mL of contrast agent was administered to confirm accurate needle placement, which was followed by injection of approximately 8 mL of contrast agent into the hip joint by using the end of the extension tube as a port.
A test injection
of contrast was delivered through the dilator in the left anterior oblique projection to check for "tenting" of the fossa at the intended puncture site.
The timing of the contrast bolus for CTA scans is typically determined using either a test injection
or automated bolus-tracking software.
After a satisfactory test injection
, absolute alcohol was injected.
The next phase will be the data processing and the study of the area and the first test injections
of CO2 which are expected to take place throughout 2011 and 2012.
The pounds 120,000-a-year star has already had two test injections
containing a small amount of collagen to make sure she is suitable for the full treatment.