| 摘要 |
A magnetic field gradient coil includes upper and lower sections ( 40, 42 ) that define a coil bore ( 44 ) therebetween. The upper section ( 40 ) has an arcuate curvature (C<SUB>upper</SUB>) transverse to a longitudinal direction and a length (L<SUB>upper</SUB>) in the longitudinal direction that is smaller than a longitudinal length (L<SUB>lower</SUB>) of the lower section ( 42 ). Gradient coil windings ( 70, 72, 74, 76, 102, 104, 112, 114 ) impose one or more transverse magnetic field gradients on a static magnetic field generally oriented in the longitudinal direction. The windings are supported by the upper and lower sections ( 40, 42 ) of the coils support. The windings supported by the upper section ( 40 ) are longitudinally limited in distribution to the longitudinal length (L<SUB>upper</SUB>) of the upper section ( 40 ), which is shorter than its diameter. The windings supported by the lower section ( 42 ) are longitudinally distributed across substantially the length (L<SUB>lower</SUB>) of the lower section ( 42 ).
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