Siemens SIREMOBIL Iso-C

© Siemens, 2008 SPR2-230.840.01.01.02 SIREMOBIL Iso-C
08.08 CS PS SP
Adjustments / Programs 45
Page 45 of 148
For internal use only
Dose rate to be set at the I.I. input screen: 0
NOTE
*
For LOW dose rate levels in zoom format:
Due to the maximum possible opening of the TV iris, deviat-
ing 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 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 collimator in zoom format >= opening of TV iris collimator
in survey format).
When the dose rate level is set to LOW in zoom format, the
display "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 Parame-
ter 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.
Setting the dose rate for survey format 0
x On the service PC, click the "Update Start" button.
x Select the I.I. survey format.
x Center the dose measurement chamber on the I.I. input screen and attach.
x Use the key to select the dose rate (LOW / MID / HIGH, shown in the "DOSER-
ATE" line).
I.I. type I.I. format Dose rate
LOW MID HIGH
23 cm (9") I.I. Survey 111 nGy/s 185 nGy/s 370 nGy/s
23 cm (9") I.I. Zoom 157 nGy/s * 262 nGy/s 523 nGy/s
I.I. type I.I. format Dose rate
LOW MID HIGH
27 cm (11") I.I. Survey 85 nGy/s 140 nGy/s 280 nGy/s
27 cm (11") I.I. Zoom 165 nGy/s * 262 nGy/s 523 nGy/s