Crossed-ladder RF coils for vertical field MRI systems
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United States of America Patent
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Aug 27, 2002
Grant Date -
N/A
app pub date -
Dec 28, 1999
filing date -
Dec 28, 1999
priority date (Note) -
Expired
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Abstract
A crossed-ladder RF coil assembly (48) is employed for quadrature excitation and/or reception in an open or vertical field magnetic resonance apparatus. The RF coil assembly (48, 70, 90) includes a pair of coil assemblies (50, 52; 70, 72; 100, 102) which are disposed in a parallel relationship. Coil arrays (50, 52; 100, 102) include at least two ladder RF coils (50.sub.1, 50.sub.2, 50.sub.3 ; 52.sub.1, 52.sub.2, 52.sub.3 ; 100.sub.1 . . . , 100.sub.8 ; 102.sub.1, . . . , 102.sub.8) which are disposed in an overlapping relationship and are rotated by 90.degree. relative to one another. Each ladder RF coil of one coil array is rotated by 90.degree. relative to adjoining ladder coils and each corresponding ladder RF coil of the other coil array. The crossed-ladder RF coil assembly provides better B.sub.1 field uniformity and elongated anatomical coverage for spine and neck imaging. In addition, the RF coil assembly reduces noise from the body at higher fields in vertical field magnetic resonance systems.
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