Waveguide
Waveguides are tubes that are a part of the penetration panel. The headstage cables simply
pass through. The non-ferrous MRI-compatible headstage is connected to the MRI-compatible
electrode. This goes through a very long cable (up to 6-7m) to the control room to the PZ5 /
PZA Subject Interface. Know the length from the bore isocenter to the waveguide when
determining what length of cable is needed. The full setup looks like this:
Filter plate
In addition to the waveguide, there is also often a
fi
lter plate for BNC and DB25 connectors on
the penetration panel to pass signals between the MRI room and the control room. Use the
DB25-female and DB25-male connectors provided in the TDT MRI kit to connect the headstage
through the
fi
lter plate to the ampli
fi
er.
Some
fi
lter plates are just pass-through connections, in which case you need to use the TDT RF
fi
lter in the cable connection.
The penetration panel and RF
fi
lter do not remove scanner artifact from the neural recordings. This is done on the
RZ processor in real-time using the MRI Recording Processor gizmo, as discussed in the
MRI Gizmo section
.
Note
fMRI User Guide | 22
