Magnetic resonance insert gradient coils with parabolic returns

Details Magnetic resonance insert gradient coils with parabolic returns Magnetic resonance insert gradient coils with parabolic returns

1994-08-05

1996-01-16

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

1286535, G01V 300

Patent

active

054850878

ABSTRACT:
An insertable coil (40) is inserted in a bore (12) of a magnetic resonance imaging apparatus. Primary field magnets (10) create a temporally constant magnetic field longitudinally through the insertable coil. A computer control (58) controls a radio frequency coil (46) and a gradient coil (42) to create magnetic resonance imaging sequences and process received magnetic resonance signals into image representations. The insertable gradient coil includes a cylindrical, dielectric former (44) of appropriate diameter to receive a patient's head. A pair of parabolic cutouts (62) are defined adjacent a patient receiving end of the dielectric former and are of an appropriate size to receive the patient's shoulders. In this manner, the patient's head can be centered in a longer head coil. Four thumbprint type x-gradient coil windings (72) are mounted symmetrically on the dielectric former with the parabolic cutouts (74) centrally on one side of the thumbprint coil windings. The windings of the thumbprint coils are contoured to follow the parabolic cutout. Four y-gradient coil windings (84) rotated 90.degree. from the x-gradient coils are mounted on the dielectric former. The y-gradient thumbprint coil windings are mounted between the parabolic cutouts and windings along their corners (82) conform to the parabola.

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"Torque Compensated Asymmetric Gradient Coils for EPI", Abduljalil, et al., SMRM 12th Annual Meeting, vol. 3, p. 1306 Aug. 1993.
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