Design of asymmetric ring diameter birdcage volume coil has been studied by electromagnetic filed simulations. Even if the diameter of the front and the rear rings of the birdcage coil is changed to some extent with respect to the cylindrical RF shield, the uniformity in the Z direction can be maintained by changing the width of the front and rear rings. Increasing the gap between the ring and the RF shield has an advantage in efficiency even applied on one side of the ring.
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