Title :
Novel gradient coil set with canceled net thrust force for nuclear magnetic resonance applications
Author :
Petropoulos, Labros S. ; Morich, Michael A.
Author_Institution :
NMR Div., Picker Int. Inc., Highlands Hts., OH, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
The interaction of the spatially varying main field components of a Magnetic Resonance Imaging (MRI) system with the currents of a gradient coil set generates axial and transverse Lorentz forces. In this paper, a novel technique for designing minimum inductance gradient coils with zero net axial and lateral Lorentz force is presented. Design examples are given for a short magnet geometry. A theoretical comparison between force-canceled and traditional gradient coils reveals a 270 to 2200 fold reduction for the Lorentz force, with up to 12% increase in stored energy
Keywords :
NMR imaging; eddy currents; magnetic shielding; superconducting coils; superconducting magnets; axial Lorentz forces; canceled net thrust force; design; eddy current control; fold reduction; gradient coil set; inductance gradient coils; magnetic resonance imaging; nuclear magnetic resonance applications; shielded superconducting magnet; short magnet geometry; spatially varying main field components; stored energy; transverse Lorentz forces; Boring; Coils; Current density; Geometry; Lorentz covariance; Magnetic fields; Magnetic resonance; Magnetic resonance imaging; Magnetic shielding; Nuclear magnetic resonance;
Journal_Title :
Magnetics, IEEE Transactions on
