Abstract: A head clamp for use in imaging of a part of a patient using Magnetic Resonance and X-ray imaging is formed as a generally C-shaped support including a base and two legs arranged so that the clamp members with pins are attached to the legs. An adjustment system moves one of the clamp members inwardly and outwardly relative to the other so as to apply a clamping force to the skull. The C-shaped support member comprises a truss with a C-shaped inner band adjacent the skull, an outer band generally following the shape of inner band and a plurality of spaced bars between the inner band and the outer band. The adjustment system comprises a screw that adjusts the width of the C-shaped member located at the base of one leg.

Abstract: An array of optical elements for processing a spatially dispersed optical beam including monitoring optical elements for determining the position of the optical beam in the array is disclosed. The monitoring optical elements have a width that varies in ay direction normal to the array axis, enabling the determination of the beam position across the monitoring elements in both x and y directions. The monitoring optical elements are preferably disposed in the end portions of the array for the beam tilt determination. The optical elements can be e.g. liquid crystal pixels or micro-mirrors.