Setting The Dose Rate For Survey Format - Siemens SIREMOBIL Iso-C Service Instructions Manual

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Dose rate to be set at the I.I. input screen:
I.I. type
23 cm (9") I.I.
23 cm (9") I.I.
I.I. type
27 cm (11") I.I.
27 cm (11") I.I.
*NOTE

Setting the dose rate for survey format

•
On the service PC, click on the "Update Start" button.
•
Select the I.I. survey format.
•
Center the dose measurement chamber on the I.I. input screen and attach.
SIREMOBIL Iso-C
System Manual
I.I. format
Survey 111 nGy/s
Zoom 157 nGy/s
I.I. format
Survey 85 nGy/s
Zoom 165 nGy/s
For LOW dose rate levels in zoom format:
Due to the maximum possible opening of the TV iris, deviating
dose rate values are acceptable, if the dose rate level is set at
LOW in zoom format.
When the dose rate level is set at LOW in the zoom format, the
minimum position value (= minimum opening) of the TV iris may
be the same value as in the survey format. (Opening of TV iris col-
limator in zoom format >= opening of TV iris collimator in survey
format).
When the dose rate level is set at LOW in zoom format, the dis-
play "BRIGHTNESS DEVIATION" may show a value greater than
+ 3.
If the value shown in "BRIGHTNESS DEVIATION" is greater than
+ 3, you must read out and evaluate the position values of the TV
iris collimator when the dose rate level is set to LOW in both the
zoom and survey formats:
(Service PC, Menu Adjustments... / Parameters.../ Doserate
adjustment, Parameter LOW - Zoom format pos. and Parameter
LOW Full format pos.)
Acceptable parameter values are:
LOW - Zoom format pos. >= LOW - Full format pos.
Unacceptable parameter values are:
LOW - Zoom format pos. < LOW - Full format pos.
SPR2-230.061.01
Rev. 13
Adjustments / Programs
Dose rate
LOW MID
185 nGy/s
*
262 nGy/s
Dose rate
LOW MID
140 nGy/s
*
262 nGy/s
Page 6 of 30
12.04 CS PS 24
HIGH
370 nGy/s
523 nGy/s
HIGH
280 nGy/s
523 nGy/s
5
Siemens AG
Medical Solutions