3.5 Run Fast Calibrations
NOTICE
Please refer to the Safety chapter for important safety information regarding the
use of the equipment and software on this system.
•
If the detectors are not at operating temperature, a message will indicate
when they are.
•
If there is a large shift in room temperature (±10 degrees), perform a Fast Cal
to maintain optimum IQ. Once the room temperature has stabilized, perform
another Fast Cal.
For the permissible environmental operating conditions for the CT scanner,
see Technical Reference Manual Chapter 7 Systems Specifications,
Environmental Specifications.
•
The system will notify you if it has been more than 24 hours since the last
Fast Cal was run.
•
If you experience a scan abort during Fast Cal, notify your Service Engineer.
•
The system will notify you if an unrecognized tube has been installed on the
system. Fast Calibration techniques are designed specifically for GE tubes
and GE cannot guarantee that the performance of the system will meet
specifications with an unrecognized tube. Fast Cal will run in
AutoScan
mode.
1. Clear the gantry of any objects or personnel. Any obstruction in the gantry
may lead to artifacts in scanned images.
2. From the
Utilities
menu, click
Daily Prep
, then
Fast Cal
.
The
Service-Calibration Tools
window opens.
3. Select
Fast Cal
from the drop-down and click [Run].
4.
Press [Start Scan]. Respond to all messages that display during the
calibration (approximately 15 to 20 minutes). Execute any necessary actions
indicated in the messages.
○
If the system detects a dirty scan window (which may be caused by a
beam obstruction, something in the gantry, contrast, dirt, or other matter
on the scan window), a message displays. Clean the scan window and
click [Retry] or click [Continue] to skip the check.
○
The following automated calibration check procedures occur: tube
warmup (if needed), balance check, scan window check, two channel
map scans and basis air scans. Read the screen messages for calibration
status.
5. The system returns to the
Service-Calibration Tools
window when the checks
are complete. Click [Dismiss] to exit the window.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
202 3 Daily Quality Assurance
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