Therapy tomograph with homogeneity device

Details Therapy tomograph with homogeneity device Therapy tomograph with homogeneity device

1995-07-13

1996-08-13

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324319, 335216, G01V 300

Patent

active

055459978

ABSTRACT:
In an NMR tomograph with superconducting main field coil (10) and large transverse access opening a compensation of inhomogeneities of the static magnetic field without hindering the axial and transverse access to the investigational volume (V) can be effected by the following elements:
ferromagnetic homogeneity elements (20) which are arranged on the surface of the room temperature bore on both sides of the transverse access opening;
at least one or more (a number p.gtoreq.1) superconducting correction coils (C.sub.1 and C.sub.p) which can be separately supplied with current and which are coaxial to the main field coil (10), whereby each correction coil (C.sub.1 through C.sub.p) comprises at least two partial coils (C.sub.1i, C.sub.1a through C.sub.pi, C.sub.pa), whereby all partial coils of all correction coils (C.sub.1 through C.sub.p) are cylindrical coils coaxial to a common axis (z) having a diameter less than the inner diameter (d.sub.a2) of the outer field coil (1a, 1b), whereby in each correction coil one partial coil (C.sub.1i through C.sub.pi) has, in each case, as small a separation from the middle plane (E) as possible generally equal to the separation of the radially inner field current pair (2a, 2b) from the middle plane and whereby each correction pair has, in each case, at least one second partial coil (C.sub.1a through C.sub.pa) with an oppositely directed current which has a larger axial separation from the middle plane (E) than the radially inner field coil pair (2a, 2b).

REFERENCES:
patent: 5389909 (1995-02-01), Havens
patent: 5485088 (1996-01-01), Westphal et al.

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