Support structure for biomagnetic scanning chamber - has robust aluminium screening cage on concrete base with stable pillar and transom beam scanning head orientation

摘要

A support structure (14) for a biomagnetic measurement system (15) is housed in an external screening chamber (2) which has a torsionally rigid rectangular shell (5) of sheet aluminium reinforced on all sides by a welded lattice (not shown) of sectional aluminium. The shell (5) provides a stable location for the structure (14) on a concrete base (52) via the fastening assemblies (16,18) attached to the floor (6) and ceiling (8) respectively. Two fixed pillars (20) enable vertical movement of the biomagnetic head (15) via the sleeve guides (24) and rotatable (48) transom beam (26). Vertical (46) and radial (50) head (15) adjustment together with the scanning couch (34) mobility (38,40,42) provide complete flexibility of examination. USE/ADVANTAGE - Is a robust and stable installation which insulates measurement system from errors caused by vibration and mechanical distortion of support structure. Natural frequency of structure is high and effects of resonance are readily filtered out. Electromagnetic screening is completed by peripheral mu-metal screens.