Troubleshooting

Problem

Symptom

Message

Probable Cause

Action

Remedy

Turning the Tuning/Matching Rods does not tune/match the CryoProbe

Mechanics of Tuning/Matching Rods not functional.

• Remove CryoProbe from the magnet.
• Check rods, rod extension and connection into the CryoProbe body.

Brightest image area not where expected.

The Reference Power was not correctly set for the desired region.

Readjust the Reference Power.

Images are too noisy

The spatial resolution is too high.

Reduce matrix, increase FOV, or increase slice thickness.

The lifting mechanism of the animal bed did not work.

• Check lifting mechanism with the position gauge before entering the magnet.
• Don’t pull back the animal bed for repositioning; use the adjustment screw instead.

The distance of the animal’s head to the coil is too large.

Adjust the center of gravity of the animal bed.

Image shows only Noise

The RJ45 (LAN) connector at the CCM filter plate was not plugged in.

Plug in the RJ45 (LAN) connector at the CCM filter plate.

Water condensation or ice in the coil head.

The TCU heater (or the TCU itself) was switched off or automatically switched off during a power outage.

• Switch the TCU heater on and set temperature.
• Install an uninterruptable power supply (UPS) for the TCU if frequently power outages occur.

Water condensation or ice at the rear of the CryoProbe where interfaced to the interconnection.

Bottom heater is off.

Please contact the MRI CryoProbe Service.

The animal bed is locked in the magnet.

The lifting mechanism of the animal bed is stuck in the „up“ position.

• Pull the rear side of the animal bed up in order to move the head down: then carefully pull the animal bed out.
• To avoid such problems, adjust the center of gravity of the animal bed (including mouse and all needed animal monitoring equipment) such that the front of the bed is down.