Correction Factors; Dose Rate To Be Set At The I.i. Input Screen - Siemens SIREMOBIL Compact L Service Instructions Manual

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Correction factors

•
Grid correction factor 23 cm (9") I.I. and 17 cm (7") I.I.:1.5
•
Dose measurement chamber correction factor for Dali and Nomex:1.06
•
Multiply the Dose rate values to be set at the I.I. input screen with the Grid correction fac-
tor and - if needed - with the Dose measurement chamber correction factor.

Dose rate to be set at the I.I. input screen:

I.I. type
17 cm (7") I.I.
17 cm (7") I.I.
23 cm (9") I.I.
23 cm (9") I.I.
*NOTE
SIREMOBIL Compact
System Manual
I.I. format
Survey 132 nGy/s
Zoom 187 nGy/s
Survey 111 nGy/s
Zoom 157 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 to
LOW in zoom format.
When the dose rate level is set to 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 to 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.
SPR2-130.061.02
Rev. 11
Adjustments / Programs
Dose rate
LOW MID
220 nGy/s
*
311 nGy/s
185 nGy/s
*
262 nGy/s
Page 6 of 30
09.04 CS PS 24
5
5
HIGH
440 nGy/s
622 nGy/s
370 nGy/s
523 nGy/s
Siemens AG
Medical Solutions