Dose Rate Adjustment - Siemens ARCADIS Varic Manual

Adjustments

Dose rate adjustment

Explanation of the status bar during the "Dose Rate Adjustment".
Auto Regulation
Brightness Deviation
Control Curve
Adjustment
I.I. Zoom Status
Dose rate
TV -Iris Actual Position
TV -Iris Nominal Value
Prerequisites
The grid remains on the I. I.
Filter for X-ray tube output is 2.7 mm Cu or alternatively 25 mm Al and 1.2mm Cu.
Dose rate correction factors
NOTE
Correction factor for the small dose measurement chamber is 1.00.
Correction factor for the large dose measurement chamber is 1.06.
Grid correction factor is 1.50.
Correction factor with large chamber and grid is 1.59.
Dose rate 23 cm I.I. with grid
Siemens AG
Medical Solutions
Indicates the current status of the automatic adjustment.
(NOT READY / NOT ACTIVE / ACTIVE / DONE / STOP flu-
oroscopy)
Shows the difference in the actual brightness value minus
the nominal brightness value.
Shows the currently selected fluoro curve. DA CFC 75 kV
is used for dose rate adjustment.
Shows the operating control mode.
(Generator / Camera Iris / Stop)
Shows the current I.I. format (full format / zoom)
Shows the dose rate selected.
(LOW / MID / HIGH)
Shows the actual TV iris value.
Shows the stored or nominal TV iris value from the learn-
ing phase.
For doserate "LOW", the brightness deviation value can be
higher than 0 ± 10 and also the resulting dose can be
higher.
For dose rate "MID" and "HIGH" brightness, the deviation
value should be 0 ± 10.
Make sure to use the correct "dose rate correction factors," based
on the chamber used.
SPR2-310.842.01.07.02
12.06
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ARCADIS Varic / Orbic