TOUCHSCREEN CONFIGURATION
The ampli
fi
er produces high frequency EMF that is outside of any electrophysiological signal
range, but is in the frequency range used by the scanner. This can introduce noise artifacts in
the scanner image, as shown in the example below. These artifact show up as faint white lines
across the image.
Example ampli
fi
er artifact in scanner image
Two of the built-in features of the PZ5 / PZA Subject Interface introduce artifact and must be
disabled during recording.
Turn off ampli
fi
er wi
fi
The ampli
fi
ers have built-in wi
fi
to allow network updates. This must be disabled during the
scan (and can remain permanently disabled, use the Ethernet port to do network updates).
PZ5: Press the 'PZ5' icon on the touchscreen -> Con
fi
g -> More -> set Wireless to 'Off'
PZA Subject Interface: Press the 'SIM' icon on the touchscreen -> Con
fi
g -> set Wireless
to 'Off'
Turn off ampli
fi
er touchscreen
The touchscreen is a big source of high frequency EMF. During the actual scan, the
touchscreen must be turned off.
PZ5: Press the 'PZ5' icon on the touchscreen -> Con
fi
g -> set 'Autosleep' to '5 min'. This is
currently the minimum setting and will turn off the touchscreen display after 5 minutes
of inactivity.
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fMRI User Guide | 14
