Dose Rate Adjustment; Prerequisites; Preliminary Steps; Correction Factors - Siemens SIREMOBIL Iso-C Service Instructions Manual

Adjustments / Programs

Dose rate adjustment

Prerequisites

•
The "Adjustment mode" parameter in the "Doserate adjustment" parameter group has
been programmed to "semi-automatic" .

Preliminary steps

•
Switch on SIREMOBIL Iso-C.
•
Connect the service PC to the serial interface of the SIREMOBIL Iso-C.
•
Start the service program.
•
Select the "Diagnostics..."menu.
•
Select the "Monitoring..."menu.
•
Select the "Doserate adjustment" menu from the Combo Box "Group 1" .
•
Click on the button "Update Start".
•
The following is displayed on the service PC:
AUTO REGULATION
BRIGHTNESS DEVIATION shows the difference in the actual brightness value minus the
CONTROL CURVE
ADJUSTMENT
I.I. ZOOM STATUS
DOSERATE
TV-IRIS NOMINAL VALUE shows the stored or nominal TV-iris value from the learning
TV-IRIS ACTUAL VALUE
•
Select the I.I. survey format ( refer to the I.I. ZOOM STATUS).
•
Insert 25 mm Al and 2.1mm Cu at the radiation exit port of the SIREPHOS.
•
Center the dose measurement chamber on the I.I. input screen and attach.
•
The grid remains on the I.I.

Correction factors:

•
Grid correction factor 23cm (9") I.I.: 1.5 / 27 cm (11") I.I.: 1.5
•
Dose measurement chamber correction factor for Dali and Nomex: 1.06
Siemens AG
Medical Solutions
indicates the current status of the automatic adjustment.
(active / not active / manual / done)
nominal brightness value.
shows the currently selected fluoro curve (default: S2, antiiso-
watt 5 mA)
shows the operating control mode.
(Generator / Camera Iris / Stop)
shows the current I.I. format (survey / zoom)
shows the dose rate selected.
(LOW / MID / HIGH)
phase.
Note: An offset value is added to this value.
For this reason, the TV-IRIS NOMINAL VALUE and TV-IRIS
ACTUAL VALUE differ despite the correct adjustment
(BRIGHTNESS DEVIATION 0 + 3).
shows the actual TV iris value.
SPR2-230.061.01
Rev. 13 12.04
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System Manual