GE Revolution CT User Manual page 200

Tube Icon
Blue
Yellow
•
For the best care of your tube, never skip the tube warmup. Perform the warmup when the
system notifies you to do so. The time to warm up the tube is calculated to put the system in
the optimal operation state as quickly as possible.
• To avoid delays in scanning, check the tube state before moving patients into the scan
room.
•
The system will notify you if Tube ID verification fails (an unrecognized tube has been
installed on the system). Follow the instructions in the posted message. Tube cooling
algorithms are designed specifically for GE tubes and the performance of the system cannot
be guaranteed.
• Perform a cold tube warmup after two hours of non-use. The warmup takes about 80
seconds. Scan within 30 minutes of the tube warmup. Failure to perform the tube warmup
may result in serious tube and system damage and will reduce the maximum mA possible.
The system will warn you about the reduced mA due to a canceled or skipped tube warmup.
The following table shows the limits on mA for each focal spot size.
Focal Spot Size
Small
Large
XLarge
Acceptable mAs (mAs = mA × Rotation Time) can be achieved by changing rotation times
as needed.
200
Tube Message
Tube is cold. Run tube warmup.
Tube warmup recommended.
Illustration 5: Tube at normal scanning temperature
Illustration 6: Tube is cold
Illustration 7: Tube warmup recommended
Maximum mA if tube warmup is skipped or canceled
165 mA
330 mA
370 mA
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
User Action
Click the tube icon, and then click [Tube Warm Up].
Time indicates how long the tube can remain idle before
tube warmup is required.
Wait for the warmup to complete before scanning.
Time indicates how long the tube can remain idle before
tube warmup is required.
3 Daily Quality Assurance