Abstract: A magnetic resonance imaging apparatus defines an examination region (14) within which main magnets (10) create a uniform magnetic field. Magnetic resonance is excited in dipoles of a subject within the examination region causing the generation of magnetic resonance signals that are received by either a localized coil (C) or whole body radio frequency coils (22). The radio frequency coils are disposed sufficiently adjacent the examination region that the coils are subject to magnetic fields and magnetic field gradients, that any ferrous metals would alter the magnetic field. Magnetic resonance signal processing circuits (54) which are mounted on the coil are free of ferrous materials, such as iron and nickel, to prevent distortion of the uniform magnetic field. The circuit includes an array of unpackaged component dice which are free of ferrous or other packaging.

Abstract: A magnetic resonance imaging apparatus defines an examination region (14) within which main magnets (10) create a uniform magnetic field. Magnetic resonance is excited in dipoles of a subject within the examination region causing the generation of magnetic resonance signals which are received by a localized coil (C). Because the localized coil is disposed within the examination region, the localized coil, particularly a magnetic resonance processing circuit (54) mounted on the coil is free of ferrous materials, such as iron and nickel, to prevent distortion of the uniform magnetic field. The circuit includes an array of component dice which are free of ferrous or other packaging. The dice are adhesively bonded to a substrate (62) and connected by whiskers (82) with electrically conductive lead lines (60) on the substrate. In one embodiment, the component dice include a transistor (Q1) and other circuit components for amplifying the received resonance signal.