Please note: From 1.1.2010 inmed offers RF-shielded enclosures, magnetic shieldings including interior finishing, as well as magnetic field compensations, exclsuively through the company HAMACO GmbH. The following description is informative only.

Sound Propagandation

In principle noise must be distinguished into structure-borne sound and airborne sound. Thereby a different approach to eliminate the sound propagation must be considered.The sound propagation within of a room or building (structure-borne sound and airborne sound) depends on local circumstances – this means the structure of the rooms and the structure of walls, ceilings and floors.The fixing points of the magnet, penetrations and penetration panel, RF-doors, RF-windows and the interior finishing inside of a RF-shielded enclosure are the most critical components.

Sound damping

The standard self-supporting -cage achieves a sound damping of >40 db.
Measures for optimised sound damping:

• Sound damping for airborne sound with additional partition walls, sound absorbing heavy curtains, additional sound absorbing ceilings, sound absorbing wall and cabin floor construction, RF-door and RF-window in sound damping version.
• Sound damping for structure-borne sound with uncoupling of the magnet from the building and introduction of additional masses. The following sound damping measures have proved themselves:

• Cabin floor:

1. Fixation of the magnet on separate stand, floatingly mounted RF-cage floor floatingy mounted on sound and shock absorbing underlayer
2. Introduction of additional masses (chipboard plates etc.)

• Cabin walls:

1. Increase of masses (chipboard plates, gypsum plates)
2. Additional lining with sound absorption material
3. Keeping of wall distances
4. Additional wall with sound absorption materials
5. Cabin walls sealed to cabin ceiling

• Cabin ceiling:

1. Self supporting ceiling construktion
2. Self supporting ceiling construktion
3. Keeping of ceiling distances
4. Increase of masses (chipboard plates, gypsum plates or lead)
5. Insertion of membranes, executed with lead-covered hardwood boards

All specifications referring to the noise level include the building structure. A noise absorption for the floor of 60 dB(A) consists of the raw floor structure, the insulation materials and the floor structure of the RF-shielding.

Magnetic Shielding

After completion of a site visit and site evaluation, the results of a B0 measurement it may turn out that a MRI system can be installed only after an additional magnetic shielding is provided. The environmental conditions in the surrounding of a MRI system must be free of interfering influences. Magnetic shielding achieve a safe use of a MRI system any hazard to patients and staff and reduce in the reverse case the influences of moved ferromagnetic parts in the vicinity of the magnet (elevators, cars or trucks) on the magnet of a MRI system. Therefore magnetic shielding is an important measurement for the planning and realization of a MRI project. A MRI site, which is inappropriate without a magnetic shielding, will be within the given specification of a MRI manufacturer after the installation of a proper magnetic shielding. A magnetic shielding is made out of soft iron plates or transformer plates. Inmed guarantees a fast and professional installation of a magnetic shielding. After completion of the installation of a magnetic shielding, the position of the fringe field lines are measured and documented. For special requirements (trains and subways in a close distance may require an active field compensation, which can be provided by inmed as well.