•The aperture controls the depth of sharpness. If the aperture is changed the camera electronics
automatically readjusts the amplification. Closing the aperture increases the depth of sharpness
and in that way the image quality.
•The focus adjustment ring serves for the manual refocusing.
The position of the focal length and focus adjustment rings can be fixed with two screws.
4. Connection of camera to filter box
The camera is connected to the filter box via the camera connection cable, which includes power
and signal lines as well as shielding.
The filter box includes a low pass filter that suppresses frequencies higher than 1 MHz with over
100 dB. This filter prevents damage and interferences caused by the high frequency signals of the
MR scanner.
5. Filter box installation
For a permanent installation, the filter box should be screwed onto the panel board by means of the
feed through camera connector (see figure 2 . Figure 3 illustrates the recommended configuration:
•A 12 mm through hole in the panel board is required.
•The camera connector is guided through this hole.
•The camera connector provides the ground connection to the shielding of the MR cabinet.
For temporary use, the camera cable can be brought into the MR cabinet by other means, e.g.
through a service entry hole (“waveguide” . In this case, an additional grounding cable should be
used to connect the camera connector to the shield panel grounding. The camera connector must
completely protrude into the MR cabinet and the video cable must not jut out.
MRC Systems GmbH version: 6 - 2010-12-03 page 3 of 6
Figure 2: Filter box (front side
camera
connector
