QD MRI RE coil using non-homogeneous and non-uniform RF field di

Details QD MRI RE coil using non-homogeneous and non-uniform RF field di QD MRI RE coil using non-homogeneous and non-uniform RF field di

1986-06-25

1987-11-17

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, 324307, 128653, G01R 3320

Patent

active

047076640

ABSTRACT:
A pair of co-located RF surface coils extend axially and part-circumferentially about a volume to be imaged. Because surface coils are employed, the RF field distribution will be non-symmetric, non-homogeneous and non-uniform within the volume. Nevertheless, if the two coils are rotationally offset by the proper amount (and possibly including capactive isolation coupling therebetween), the coils produce a pair of RF signals to/from the volume which are in quadrature phase thus providing signal-to-noise ratio improvements due to: (a) the fact that quadrature detection techniques are employed and (b) the fact that only a portion of the cross-sectional volume is effectively addressed by the surface coils (i.e., due to their non-symmetric, non-homogeneous and non-uniform field distribution).

REFERENCES:
patent: 4648405 (1987-03-01), Keren
patent: 4652827 (1987-03-01), Eguchi et al.
"Quadrature Detection Coils-A Further.sqroot.2 Improvement in Sensitivity" by Chen et al, J. Mag. Res. 54, 324-327 (1983).
"Quadrature Detection in the Laboratory Frame" by Hoult et al, Mag. Res. Med., 1, 339-353 (1984).
"A Quadrature Probe for Adult Head NMR Imaging" by Sank et al, Department of Radiology, NIH, pp. 650-651.
"Radio Frequency Penetration Effects in MR Imaging: Simulation/Experiment with Linearly Polarized and Circularly Polarized RF Fields" by Glover et al, GE Medical Systems, pp. 264-265.
"An In Vivo NMR Probe Circuit for Improved Sensitivity" by Murphy-Boesch et al, J. Mag. Res. 54, 526-532 (1983).

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