TDT fMRI, User Manual

Page: 23 / 30

Minimizing Ampli fi er Artifact During MRI Scans
We recommend the following setup:
Place the PZ5 / PZA Subject Interface ampli fi er outside the MRI room in the control room or
component room. You can place the ampli fi er on a cart in the control room just outside the
penetration panel. All cables pass through either a waveguide on the penetration panel or
through a DB25 connector on the panel.
Turn off the wi fi and the front display screen on the PZ5 / PZA Subject Interface ampli fi er.
See Touchscreen Con fi guration .
Test the system using a phantom with no RF fi lter. This is your baseline signal.
If there is signi fi cant artifact connect the RF fi lter to the back of the PZ5 / PZA Subject
Interface ampli fi er and the GND on the RF fi lter to either:
a. The MRI GND. This is the GND found on the gradient power supply. This GND is fl oating
relative to earth and will remove most of the artifact.
b. Room or Shield GND. This is the GND found in the penetration panel, which is connected
to the shielded room around the MRI. This shield usually goes to truth earth GND. This will
remove some but not all the artifact.
1.
2.
3.
4.
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