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Correct Positioning of Participant in Chair

DO NOT put a particpant under the gantry except when the green "OK" light on the position indicator display ("traffic light") is continuously lit.

Care should be excercised to prevent limbs, fingers, or toes being left between the moving parts of the chair and the gantry or doorway.
Instruct the paticipant to keep hands on the table, armrests or on his/her lap.

DO NOT leave anybody alone inside a closed magnetically shielded room (MSR) without the presence of another person outside the room.

When studying patients or small children, an accompanying person in the room is highly advisable, particularly if it is likely that the patient cannot call for help or get out in case of emergency.
Make sure the MSR video and audio monitoring is on and working. Test the monitoring system before measurement.

Positioning the Participant

Always activate the brake before the participant sits down or gets out of the chair.

Before starting

  • Change the gantry position to reclined or upright seated, if needed.
  • Make sure that no one is under the gantry during position change.
  • Make sure that you have the participant chair available for the measurement.

Procedure

  • Move the chair close to the gantry.
  • Activate the brake of the chair.
  • Elevate the particpant chair seat to half of the maximum height, at least, and release the legrests to make it easier for the participant to sit down.
    • The legrests should always be supported by hand when lowered down.
    • Weight should not be put on the legrests. Always lower the legrests before assisting the participant in or out of the chair.
    • For participants with limited movement capacity, it is recommended to lift the chair to the uppermost position and detach the T-bar handle.
  • Assist the participant into the chair.
  • Lower the seat down.
  • Lock the legrests up, if desired.
  • Arrange the support pillows behind the back of the participant to enable a comfortable sitting position.
    • Install the special back support extension pillow behind the shoulders of tall participants.
  • Install the chair tray, if to be used.
  • Attach the T-bar handle, if detached earlier.
  • Release the brake.
  • Push the chair under the gantry.
    • Advise the participant to mind his/her head.
  • Activate the brake again.
  • Detach the T-bar or lower it on the floor.
    • Place the T-bar handle away from the feet once removed to prevent anyone from stumbling on it.
    • When the handle is lowered down on the floor, be careful not to stumble on the handle.
  • Connect the cHPI coils and electrodes to the gantry side panel.
  • Connect the stimulators to the participant, if used.
  • Elevate the seat until the head of the participant is covered by the sensor helmet.
    • Advise the participant to mind his/her head.
    • Ask the participant to give feedback during elevating the seat and adjust the height according to the feedback.
  • If needed, write down the position settings from the adjustment scales once the most comfortable position has been found.

Detaching and moving the Participant out

Care should be excercised to prevent limbs, fingers, or toes being left between the moving parts of the chair and the gantry or doorway.
Instruct the paticipant to keep hands on the table, armrests or on his/her lap.

Procedure

  • Disconnect the Bioamplifier/EEG and cHPI connectors from the gantry.
  • Disconnect the stimulators from the participant, if used.
  • Lower the participant chair.
  • Release the brake.
  • Attach the T-bar, if detached earlier.
  • Pull the chair carefully out* from the gantry.
    • Advise the participant to mind his/her head when pulling the chair out.
  • Activate the brake.
  • Detach the T-bar or lower it on the floor.
    • Place the T-bar handle away from the feet once removed to prevent anyone from stumbling on it.
    • When the handle is lowered down on the floor, be careful not to stumble on the handle.
  • Remove the chair tray, if used.
  • Lower the legrests.
    • The legrests should always be supported by hand when lowered down.
  • Assist the participant up from the chair.
    • For participants with limited movement capacity, it is recommended to lift the chair to the uppermost position and detach the T-bar handle to make it easier for the participant to get up from the chair.

Cleaning after the measurement procedure

  • After measurement, wipe the chair armrests, the chair table (if used), the used cushion set, and the sensor helmet with alcohol wipes. If EEG has been used, wipe the sensor helmet first with a damp cloth and mild detergent to remove any electrode gel. Then finally clean with alcohol wipes.