Abstract: A radio frequency signal detector coil arrangement (17) for a magnetic resonance apparatus comprising a planar coil (25) and an annular magnetic flux rejecting arrangement (25) disposed coaxially with the planar coil, on one side thereof, which reduces the sensitivity of the planar coil to signals from sources remote from the axis of the planar coil. One embodiment of the flux reducing arrangement comprises an annular superconducting member (35) disposed between the planar coil and the body (31). In other embodiments it comprises an arrangement of coils which conform to a tubular surface coaxial with the planar coil, and electrically connected therewith.

Abstract: An image intensifier 18 is comprised of an evacuated chamber, an input surface 16 having a florescent material thereon for converting incident radiation into a visible light representative of the incident radiation, a photocathode layer 20 disposed closely adjacent the input surface for emitting a cloud of free electrons 22 into the evacuated chamber in proportion to the intensity of visible light at each point thereon, and an output surface 26 having a scintillating material thereon for converting electrons impinging thereon into a relatively bright light image proportional to the electron energy at each point on the output surface said light image having a first aspect ratio. An electrical potential 24 accelerates the free electrons from the photo-cathode to the output surface. A fiber optic bundle 28 comprised of an input face, positioned outside the chamber to view the bright light image at the output surface, and an output face 34 is provided.

Abstract: A radiographic imaging system is comprised of a radiation source 12, a radiation adsorbing grid assembly 18, an image producing element 22 a controller 34, an exposure sequence start means 28 and a grid assembly oscillation means 20. The radiation source and grid define a subject receiving gap, wherein an object under examination is disposed, and through which the source propagates a beam of radiation onto the face of the image producing element. The controller recognizes when the exposure sequence start means is activated and starts the exposure sequence. The exposure sequence is comprised of an exposure preparation interval and an exposure interval. The exposure preparation interval is comprised of a radiation source preparation time and a point-in-time when the grid assembly oscillation commences oscillating the grid assembly.