the thermal images and the thermal dose contours after each sonication to avoid possible damage to
unintended tissues
Cavitation refers to formation and collapse of bubbles (created from dissolved gas), which fill cavities that
are created in low pressure regions.
As a result, bio-effects may occur due to these bubbles and are dependent on the extent and type of
cavitation.
2.3.4. Patient Emergencies
Each Exablate Prostate site must develop appropriate patient emergency procedures.
All personnel who operate the system must study and practice patient emergency procedures.
If there is any sign of risk to the patient, proceed as follows:
1. Press the Emergency Stop button mounted on the wall in the operator’s control room or the one in the
magnet room to shut down the MR and the Exablate Prostate systems.
2. If necessary, notify emergency personnel.
3. Squeeze the cradle release handle and pull the cradle onto the patient table. If the cradle does not
release, use moderate force to pull out the cradle.
4. If it becomes necessary to remove the table from the room, detach the quick-coupler cables and hoses
and remove the patient table from the magnet room. The patient table is not very maneuverable. To
avoid this limitation, perform one of the following options:
◼ Keep a non-magnetic gurney in the magnet room, or
◼ Keep a regular gurney outside of the magnet room.
5. Release the patient from the transducer interface as expediently as possible.
6. Attend to the patient, following established hospital emergency protocols.
2.3.4.1. Patient Emergency Release
In case of an emergency, the following patient release procedure should be followed:
1. Retract the cradle outside of the MR.
2. On the Motion Unit controller, press on Enable + Home. The probe will move in its shell to a protected
extraction position.
3. On the water system display, press Extract to drain the balloon back to the insertion volume. This will
also pause the water circulation in the balloon.
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