0
0
EXCITATION FREQUENCY [Hz]
Above ambient baseline
MAGNET STEADY-STATE VIBRATION SPECIFICATIONS
VIBRATION SPECIFICATIONS
50
100
150
200
250
300
350
400
450
10
20
30
40
50
Excessive vibration can affect MR image quality. Vibration testing must be performed early in the site planning
process to ensure vibration is minimized. Both steady state vibration (exhaust fans, air conditioners, pumps, etc.)
and transient vibrations (traffic, pedestrians, door slamming, etc.) must be assessed. The magnet cannot be
directly isolated from vibration. Any vibration issue must be resolved at the source.
Transient vibration levels above the
specified limits in the MR Site
Vibration Test Guidelines must be
analyzed. Any transient vibration
that causes vibration to exceed the
steady-state level must be mitigated.
All units that are wall mounted or wall supported are to be provided with supports where necessary. Wall
supports are to be supplied and installed by the customer or his contractors.
Dimensions are to finished surfaces of room.
Certain mr procedures require an extremely stable environment to achieve high resolution image quality.
Vibration is known to introduce field instabilities into the imaging system. The vibration effects on image
quality can be minimized during the initial site planning of the mr suite by minimizing the vibration
environment. See
PROXIMITY LIMITS, PATIENT TABLE DOCK ANCHOR MOUNTING REQUIREMENTS AND
VIBROACOUSTIC DAMPENING KIT
details for additional information.
Standard steel studs, nails, screws, conduit, piping, drains and other hardware are acceptable if properly
secured. Any loose steel objects can be violently accelerated into the bore of the magnet. Careful thought
should be given to the selection of light fixtures, cabinets, wall decorations, etc. To minimize this potential
hazard. For safety, all removable items within the magnet room such as faucet handles, drain covers, switch
box cover plates, light fixture components, mounting screws, etc. Must be non-magnetic. If you have a specific
question about material, bring it to the attention of your GE project manager of installations.
Floor levelness refer to
MAGNET ROOM FLOOR SPECIFICATIONS DETAIL
, this floor levelness requirement is
important for accurate patient table docking.
Non-movable steel such as wall studs or hvac components will produce negligible effect on the active shield
magnet.
Customers contractor must provide all penetrations in post tension floors.
Customers contractor must provide and install any non-standard anchoring. Documents for standard
anchoring methods are included with GE equipment drawings for geographic areas that require such
documentation.
Customers contractor must provide and install hardware for "through the floor" anchoring and/or any bracing
under access floors. This contractor must also provide floor drilling that cannot be completed because of an
obstruction encountered while drilling by the GE installer such as rebar etc.
Customers contractor to provide and install appropriate supports for the storage of excess cables.
It is the customer's responsibility to perform any floor or wall penetrations that may be required. The
customer is also responsible for ensuring that no subsurface utilities (e.g., electrical or any other form of
wiring, conduits, piping, duct work or structural supports (i.e. post tension cables or rebar)) will interfere or
come in contact with subsurface penetration operations (e.g. drilling and installation of anchors/screws)
performed during the installation process. To ensure worker safety, GE installers will perform surface
penetration operations only after the customer's validation and completion of the "GE surface penetration
permit"
STRUCTURAL NOTES
Date
Rev
/24
EN-MRI-TYP-SIGNA_EXPLORER-WEB.DWG
A
03/Aug/2018
SIGNA EXPLORER /SIGNA CREATOR
Typical
S1 - Structural Notes
11
