GE CT-9800

GE MEDICAL SYSTEMS CT 9800 QUICK SYSTEM
Rev. 19 Direction 18000
6-9A-14A
g) Check that flex circuits are not defective
h) Check that the DAS is performing normally
i) In addition: Images should be free of artifacts, for the DOSE MEASUREMENT check
Fix anything which is not correct.
9A-7-1 Reference Channel Output Verification
NOTE: Operator entries are underlined ( e.g. V means to type the letter V).
(CR) - press the RETURN key.
[CANCEL] - press the key that is denoted in brackets.
In this example, press the CANCEL key.
R
CTDS CT Diagnostic software
DC (CR) data collection
4 (CR) stationary scan with X-rays on
3 (CR) Real time statistics (RTS)
D (CR) high rotor speed (Default)
40 (CR) 40 ma
80 (CR) 80 KVP
5 (CR) 5 mm aperture
A (CR) air scan ( air filter)
(CR) Default 500 (X-RAY On Position)
(CR) Default 2500 (X-RAY Off Position)
(CR) Default 500 (Trigger On Position)
(CR) Default 2000 (Number of Triggers)
(CR) Default 1000 (Trigger Frequency)
note: => 2000 triggers at 1000/sec => 2 second scan
1 (CR) offset correct
OUTCHECK (CR) Output filename
(CR) (CR) run description (arbitrary), continue
[ENTER] Initiate scan. Write down EXAM number.
[SCAN ENABLE] press button when lit.
[CANCEL] Return to R-Level.
Next, enter ANALYSIS to calculate means and standard deviations:
R
AN (CR) Analysis
D (CR) Diagnostic Data functions
3 (CR) Compare Diagnostic Data file
E (CR) Edit function
(CR) default limit type = absolute
(CR) default output = numeric, TTY
{4 or 6} (CR) value for first channel ( 4= XENON, 6= HILIGHT)
{730 or 743} (CR) value for last channel (730= XENON, 743= HILIGHT)
(CR) default = sort
(CR) default = mean and standard deviation ( non-ref. channels)
(CR) continue
F (CR) ’file info.’, read ref. channels
Examine the means of the reference channels
The average value of the five (5) reference channels must lie between the following limits. This indicates
that the detector ( and tube ) is good.