Introduction
22
1.13 Use of the iVent201 with MRi
The iVent
201 MRi
model (serial number 5000 and greater)
maintains full functionality when operated within the MRI
(Magnetic Resonance Imaging) environment, at magnetic field
strengths up to 3 tesla, enabling clinicians to perform full body
or head scanning without disconnecting the patient from the
ventilator.
The Ventilator cannot be subjected to field strengths greater
than 100 Gauss and must be kept outside of 100 Gauss
perimeter, typically about 2.5 meters from the magnet’s Iso-
center.
For maximum safety, VerdaMed recommends that each facility
measure the Gauss field around their imaging device, and map
the strength levels, to insure that the ventilator is not placed
inside its safe operating range distance (see the procedure at
the end this section).
The mapping should result in placing permanent marking on
the floor at 5, 50, 100, and 200 Gauss strength lines with a
durable tape. The best practice that we have seen is when the
clinical staff put tape marks on the floor where certain
equipment can be safely placed within the MRi suite. The safe
distances for ventilators may require a special patient circuit to
reach the patients while they are internal to the imaging
magnets. In such cases, VersaMed offers a 3.8 patient circuit.
It is very probable that older MRi Units may not have magnetic
shielding that is 100% effective. Therefore the Gauss levels at a
given distance may differ within the same given radius from
the center of the magnet core. Hence, this is the importance of
correctly mapping out the Gauss levels for each MRi suite.
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