Limiting The Radiation Field (Collimation); Chapter: Setting The Image Geometry; Rectangular And /Or Iris Collimation; Selection / Deselection - Siemens AXIOM Iconos R200 Operator's Manual

Fluoroscopy and
Digital Radiography (DR)
(optional)
Cassette exposure
AXIOM Iconos R200
System Operation
Setting the Image Geometry

Limiting the radiation field (collimation)

Rectangular and /or iris collimation

You can view the collimation on the monitor under fluoroscopy. The default is iris
collimation.
The maximum possible collimator aperture is never greater than the selected im-
age intensifier format.
The edge of the diaphragm must be visible in the fluoroscopic image.
The collimator is opened or closed synchronously and symmetrically to the image
receptor center.
Within the selected image intensifier format, the radiation field can be collimated
basically as desired and you can switch over from iris to rectangular collimation.
On selection of a lower ZOOM level (larger field) or image intensifier full format,
the rectangular and iris collimation are retained, or the larger field is collimated
(can be configured).
On selection of a higher ZOOM level (smaller field), the collimator always switch-
es to the smaller field (iris collimation).
The system switches over automatically to rectangular collimation on selection of
the spotfilm device or tabletop cassette exposure technique.
It is not possible to select iris collimation.

Selection / deselection

Use the key on the system remote control console for selection / deselection.
◆ Press this key
– Rectangular collimation is selected: left LED lights up.
– Iris collimation is selected: right LED lights up.
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