GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 12 Direction 18000
6-9-27
9-11 Xenon Detector Q Cal Intensity
Channel 1 of the Xenon detector has a wedge located in the X-Ray beam. Its purpose is to provide a reference
signal proportion of the Z position of the fan beam. This procedure checks the intensity of the signal from
channel 1 and is used to verify detector wedge. The tube must be “cold” before performing this function.
1. Enter CTDS. This should be CTDS Default scan #16 “Q WEDGE”
• (DC) Select Data Collection
• (3) Position X-Ray Tube
• (180) 180 Degree Tube Position
• (CR)(CR) to Down Load Position
• (4) Stationary X-Ray ON
• (3) Real Time Statistics
• (D) Default Rotor Speed
• (10) 10 mA
• (80) 80 KV
• (10) 10 MM Aperture
• (A) Air Filter
• (500) X-Ray On
• (2500) X-Ray Off
• (500) Trigger On Position
• (2000) Number of Triggers; 2 second scan
• (1000) Trigger Frequency
• (2) Both Offset Corrected & Normalized
• (CR) Default; record filename
• (ZW) Run Discription
• (CR) Enter to Continue
2. Perform the scan and note the default filename assigned to the Means and S.D. File.
3. Enter AN in CTDS. Display the Means file created in step 2 using option 8. Note; this file should be
automatically selected upon entry to AN. If not, enter the default filename noted in step 1.
• (AN) Analysis
• (8) Means & S.D.
• (CR) Filename = “OUTPUT SELECTION”
• (1) Output Range; First Channel
• (752) Output Range; Last Channel
• (N) Sort (N/Y)
• (C) Output to CRT
• (A ) Data Format A/D Boudaries
• (CR) Enter to Continue
4. If the Z wedge assembly has been properly positioned, the output of Reference Channel 1 will be between
56% and 60% of the average of the normalized reference channel values.
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