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Checking the Dose Rate
•
Select the I.I. full field of view and open the collimator to the size of the measurement
chamber.
•
Confirm the message "Select II maximum ... " with OK.
•
Click Fluoroscopy on.
•
Change the mA value so that the dose rate desired appears on the dosimeter.
Dose rate values to be set:
Multiline without grid:
Multiline with grid:
Note the factor for the chamber. If you are using the Dali -/ Nomex chamber for the mea-
surement, the dose rate value must be increased by 6%.
•
Exit the dose rate adjustment field with OK after the dose rate has been reached.
•
Enter "300 mV" in the B-Signal Value field.
•
Click OK.
•
Wait for the data to be transferred to the generator (may take some time).
•
Click "Fluoroscopy on" in the CCD Brightness Adjust field if the value 0 + 1 is not
reached: Record the nominal-actual values with the algebraic sign. Exit the XCS soft-
ware.
•
In case of deviations:
- Connect the service-PC to the Multiline.
- Call up "Parameter" in the Adjustment menu.
- Click "Get from Unit."
- Select Parameter: "am 7 TV-Iris" in the parameter groups.
- Select Parameter "FLUORO Zoom 0".
- Reduce or increase the TV iris value (nominal/actual) in the Value Actual field.
If the TV iris value is negative (nominal/actual), it should be reduced.
For example, a value of "- 5" means that the nominal/actual value recorded earlier must
be reduced by a factor of - 5 x 10, i.e. by - 50.
- Click Set Value after the change.
The changed value is marked in the parameter window
(i.e. the value is not yet transferred to the unit).
- Click Put to Unit.
The message "Component... to continue" is displayed.
- Click OK after the automatic Reset.
- Switch off the system for a complete reset.
- Switch on the system.
- Record the dose rate again.
NOTE
Siemens AG
Medical Solutions
23 cm I.I.
261 nGy/s
407 nGy/s
After each reset of the Multiline, the antiisowatt curve must be
selected on the operating PC.
RXL2-120.815.01
Rev. 02
30 µR/s
113 nGy/s
47 µR/s
176 nGy/s
Page 9 of 18
02.05
CS PS 24
6 - 9
33 cm I.I.
13 µR/s
20 µR/s
LITHOSTAR Multiline
System manual
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