To perform the examination, the parameters of the measurement
sequence must be adjusted accordingly.
Online monitoring: If the stimulation limit is exceeded while a
measurement is in progress, the active measurement is aborted.
The MR system can be operated in two operating modes which differ
with respect to different levels of stimulation.
The stimulation limits are based on stimulation models derived from
the statistically determined stimulation limits. The higher the gradient
output is, the higher the probability and the intensity of the effects
(for example, peripheral nerve stimulation). To minimize the
occurrence of peripheral nerve stimulations, it is recommended to
operate the system in the Normal Operating Mode. However, heart
stimulations can be excluded.
Normal Operating Mode: In the Normal Operating Mode, the limit is
set to 80 % of the stimulation limit according to the IEC safety
standard 60601-2-33. At the maximum performance allowed in this
operating mode, the ratio of patients affected by peripheral nerve
stimulation is rather low.
First Level Controlled Operating Mode: In the First Level Controlled
Operating Mode, the performance limits are determined directly from
the statistically determined stimulation limits. Accordingly, at the
maximum performance allowed in this operating mode, up to 50 % of
all patients may experience stimulations.
Starting/Stopping the measurement
Starting the measurement
✓
The measurement protocol is loaded.
✓
No MR measurement is active.
◆ Press the Start/Stop button on the control unit. ( Page 55 System
control)
The measurement begins.
The table display is deactivated.
Operating modes
5.6
5.6.1
5 MR system operation
122
MR System | Operator Manual
Print No. MR-01501G.621.02.02.02
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