Abstract: An NMR signal measuring method for simultaneously measuring RF field components inducing in RF coils and spinning in opposite directions. The components spinning in opposite directions are measured separately and the measuring results are compared for the elimination of faults.

Abstract: The invention relates to an RF (=radio frequency) coil arrangement for an NMR examination apparatus, an object or target to be examined, e.g. a patient or part of a patient being adapted to be placed inside said coil arrangement which is adapted to excite the nuclei of a selected target area by transmitting an RF pulse substantially orthogonal to a homogeneous basic magnetic field produced by the apparatus and, thereafter, to receive and detect an NMR signal generated in the target. In order to eliminate the drawbacks of a so-called saddle coil conventionally used as an RF coil the invention is characterized in that it comprises a transfer line, continuous and wired in a manner that its various parts induce an RF field of different direction. Both in excitation and detection of signals, said transfer line can be adapted to process a magnetic field rotating in just one direction and it can be connected as an endless loop.

Abstract: The invention is directed to a coil arrangement for an NMR examination apparatus, comprising a solenoid type of coil assembly (1, 3) for producing a homogeneous basic magnetic field, fitted inside it, a high-frequency coil (5) for transmitting radio-frequency pulses and for receiving NMR-signals generated in a target to be examined, a magnetic field gradient coil assembly (9) comprising one or a plurality of coils. In order to eliminate the relative disturbance effect of coils and to optimize the size of an assembly, a former (2) of said coil arrangement for producing said basic magnetic field is made of a material at least substantially not conducting electricity, e.g. of fiberglass-reinforced epoxy, at least on those parts of the coil arrangement that are near the part to be examined of a target, and said high-frequency coil (5) is located immediately in the vicinity of said coil former (2).

Abstract: The invention relates to a coil arrangement for producing a homogeneous magnetic field especially for application to so-called NMR-imaging. An object of the invention is in terms of the size of a coil arrangement to expand the homogeneous area produced by a coil arrangement and, at the same time, to maintain the design of a coil arrangement simple and its manufacturing costs low. According to the invention, a coil arrangement includes three solenoids having a common axis, of which the axial winding width (W1) of the middlemost solenoid (1) is 2.75 . . . 2.95, preferably 2.835 . . . 2.855 times the mean radius (r1) of the middlemost solenoid (1) and the mean radius (r2) of the outermost solenoids (2) is 1.05 . . . 1.07, preferably 1.055 . . . 1.061 times the mean radius (r1) of the middlemost solenoid (1) and the axial winding width (W2) thereof is 0.32 . . . 0.38, preferably 0.340 . . . 0.342 times the mean radius (r1) of the middlemost solenoid (1).