The bed can move from side-to-side or front-to-back. The position of the bed can be controlled using the break unit mounted on the wall and maintained with the two floor locks. The wall unit (Figure 4.7 and Figure 4.8) determines in which direction the bed will move. A schematic of the bed / chair, showing all its major functions, may be seen in Figure 4.6.

Figure 4.6. MEG Bed / Chair Schematic Diagram.

Figure 4.7. MEG Bed Wall Control: Lateral movement.

Figure 4.8. MEG Bed Wall Control: Longitudinal movement.

Before a scan is started, check that the brakes are locked down onto the guide rail. To lock the break, press the “Pin Extend” button, see Figure 4.9. The This check can be done by trying to physically move bed; if the bed won't move, it is locked down.

Figure 4.9. MEG Bed / Chair Break.

In a seated experiment the bed should be as close to the dewar as possible (i.e. it should be as far towards as the guide rail will allow without the bed moving outside the edge of the guide rail).

In a supine experiment the bed should be located as close to the equipment room (wave guide) wall as possible, without touching the wave guides.

	Caution
	N.B. The bed must be locked down before there is a participant in the scanner. To avoid injuring the participant's head and/or neck, the bed must not be moved when the participant's head is inside the dewar. Make corrections to the position of the bed or dewar before the participant is inside the dewar.