Chapter 2: Safety Information and Alerts
34 MRIdian® system L-0009 Release 4.5 ViewRay Inc.
2.7 Imaging Safety
Once energized the magnet is ALWAYS on even when no
imaging is taking place.
The super-conducting magnet generates a strong homogeneous magnetic field with a field
s
trength of 0.35T
Magnetizable objects introduced into the magnetic field
become projectiles and can cause serious injury or death.
Impl
anted magnetizable objects can move inside the patient
and cause serious injury or death.
Life-support devices and emergency care equipment not specified or recommended for use
in the
magnetic field may be disturbed and this equipment may in turn also disturb the
proper functioning of the MR equipment.
The MRIdian® system is only to be used with MR-Safe equipment
as defined in ASTM F2503-08* and labeled as such by the
equipmen
t manufacturer.
MR Safe
is defined in ASTM F2503-08 as an item that poses no known hazards in all MR
environments. MR Safe items include nonconducting, nonmagnetic items such as a plastic
Petri dish. An item may be determined to be MR Safe by providing a scientifically based
rationale rather than test data.
MR Conditional is
defined as an item that has been demonstrated to pose no known hazards
in a specified MRI environment with specified conditions of use. Field conditions that define
the MRI environment include static magnetic field strength, spatial gradient, dB/dt (time
varying magnetic fields), radio frequency (RF) fields, and specific absorption rate (SAR)
MR Unsafe ar
e items that are known to pose hazards in all MRI environments.
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