Patent ID: 6181227
Filing Date: 2001-01-30
Classification: G01R

Abstract:
Magnet coil for generating magnetic fields which are rapidly variable with time in a nuclear magnetic resonance (NMR) apparatus, which is divided into a number of partial coils (Sa,Sb,Sc,Sd;Sa',Sb',Sc',Sd') which are symmetrical to one another, wherein each partial coil can be geometrically transformed into any other partial coil by one or two symmetrical operations, namely turning about an axis by 180.degree. and/or by reflection by a plane, and wherein each partial coil consists of several windings of a metallic material which are arranged on the surface of a geometric body, characterized in thatthe windings are formed of at least two conductor paths (La1, La2, Lb1, Lb2, Lc1, Lc2, Ld1, Ld2; La1', La2', La3', Lb1', Lb2', Lb3', Lc1', Lc2', Lc3', Ld1', Ld2', Ld3'), which are electrically insulated from each other and adjacent to each other on the surface of the geometric body and do not cross each other, wherein each conductor path of a partial coil can be geometrically transformed into one respective conductor path in any other partial coil by means of the said symmetrical operations, wherein the various conductor paths in each partial coil are coded in such a manner that the conductor paths (La1, La2 . . . ) adjacent in a winding are attributed with subsequent cardinal numbers as code numbers (1,2,3 . . . ) corresponding to their geometric order within this winding and that the conductor paths (La1, La2; Lb1, Lb2, . . . ) in the various partial coils (Sa, Sb, . . . ) which can be transformed into each other through the symmetrical operations, have the same code numbers (1,2, . . . ), wherein each conductor path in a partial coil is electrically connected in series with one respective conductor path in at least one other partial coil, and the series connections of conductor paths generated in this manner are electrically connected in parallel with each other, and wherein in said connection, the sum of the code numbers (1,2, . . . ) of the conductor paths connected in series in the various partial coils is the same in all series connections of conductor paths which are connected in parallel to each other.