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Reduction of eddy currents in fingerprint gradient coils for MRI
Reduction of eddy currents in fingerprint gradient coils for MRI
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机译:减少MRI指纹梯度线圈中的涡流
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摘要
A magnetic resonance imaging apparatus includes a main field magnet (12) for generating a temporally constant magnetic field through an examination region. A radio frequency transmitter (84) excites and manipulates magnetic resonance in selected dipoles in the examination region. A receiver (90) demodulates magnetic resonance signals received from the examination region, a processor (74) reconstructs the demodulated resonance signals into an image representation. A plurality of fingerprint gradient magnetic field coils (24, 26) induce gradient magnetic fields across the temporally constant magnetic field. Each of the fingerprint gradient coils (24, 26) includes a generally spiral winding (32A-32D) having a first cross-sectional dimension perpendicular to the temporally constant magnetic field which is at least twice a second cross-sectional dimension.
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