Abstract: The present invention relates to an apparatus for generating an electrical current field in the human body, comprising two or more rotatable magnetic elements for generating of a composite magnetic field, which magnetic elements are positioned such that each magnetic element is rotatable around an axis of rotation; means for producing a rotating motion of the magnetic elements such that upon rotation of one or more of the magnetic elements the composite magnetic field remains substantially constant; and means for disturbing the composite magnetic field, for altering the magnetic field entirely.

Abstract: The invention relates to an arrangement for the optical transmission of an MR signal from an MR receiving coil (6) to a detection unit (22). The light of a light source (21) is applied, by way of an optical fiber, to an electro-optical modulator which consists of an electro-optical material which is arranged between two crossed polarizers (3, 5). Thus, a light signal which is amplitude modulated around zero is generated, the intensity of said light signal being proportional to the voltage induced in the MR receiving coil (6). The modulated light signal is then conducted from the electro-optical modulator to the detection unit (22) by way of an optical fiber.