MRC 12M-i User Manual

MR-compatible camera “12M-i”

with integrated LED light

User manual

1. Intended use

Our MR compatible cameras are designed to view and record video images of subjects in an MR
scanner. They can also be used for the monitoring of objects and instruments. The cameras can be
used inside the bore of the scanner. They can be equipped with different exchangeable lenses. The
correct orientation of the cables, the correct installation of the filter box, and the correct grounding
should be checked before the application. Respective descriptions can be found in this user manual.

In the 12M-i models, an LED for different illumination purposes like face monitoring or eye-tracking
is integrated. It is based on a single light-emitting-diode (LED) which is embedded in the titanium
housing and emits diffuse light.

The cameras are not equipped with an automatic alert in case of an interruption of the video stream.
That is why they are not intended to identify critical states or situations.

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2. System components

• Camera

• LED

• Filter box (with optical isolation of video signal)

• Camera connection cable (length: 10 m, 2 m at the camera + 8 m elongation cable)

• Power supply (length: 1.8 m)

• BNC cable (length: 2 m)

• BNC/Cinch adapter

• Earth ground cable for provisional installation

There are different types of LEDs that can be used with the camera. It is possible to provide both,
visible or infrared light.

3. Video camera, lens and LED light

Figure 1 shows the camera housing with the LED and a connected lens.

The lens is connected to the standard M12 mount in the housing.

• The focus adjustment is done by screwing the lens in and out. Care should be taken not to screw

out the lens too far, as the lens may fall out of the thread.

The LED light is embedded in the camera housing. The distance to the lens is chosen in order to
avoid undesired shadowing effects.

The device is connected to the filter box via a connection cable which must be plugged into the “MR
CAM Signal IN” connector.

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Figure 1:
Video camera with LED and lens

LED

mounting holes

focus
adjustment

connection
cable

12 x 0.5 mm lens
mount with lens

4. Mounting options

The device can be mounted directly to any suitable object via the two 2 mm holes in the backplate.

Standard mounting options are:

1. direct mounting of the camera using the mounting holes

2. use of an articulated arm (optional accessory) for mounting the camera e.g. to the head coil

3. use of a ball joint mount (optional accessory) e.g. for use inside the MR bore

4. use of a tripod adapter (optional accessory) for mounting the camera on a tripod

You can find photos of the optional accessories in section 11 of this manual.

5. Connection of camera/LED to filter box

The powering of the camera and the LED is arranged via the filter box. The camera/LED is
connected to the filter box with the shielded camera connection cable which includes the power and
the signal lines.

The filter box prevents the transmission of disturbing signals into the MR cabinet. It avoids
interferences in the video signals and the MRI imaging.

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. In addition, the filter box includes an optical isolation of the video signals. In that way a full
separation of the MRI equipment from the external power network is guaranteed.

Note: The filter box is only suitable for the camera 12M-i with integrated LED. Connecting the
standard 12M or CS camera to the filter box will destroy the integrated electronics!

Figure 2: Filter box (front side)

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camera
connector