MRI using auxiliary insert gradient coil to produce intense auxi

Details MRI using auxiliary insert gradient coil to produce intense auxi MRI using auxiliary insert gradient coil to produce intense auxi

1992-02-19

1993-08-10

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324318, G01V 300

Patent

active

052352790

ABSTRACT:
An auxiliary insert MRI gradient coil is used to produce intense auxiliary magnetic gradient pulses during MRI sequences to improve MRI system performance. Although the auxiliary gradient coil may be of considerably reduced dimensions, thus, having considerably reduced uniformity, linearity and/or reproducibility than standard MRI gradient coils, coordinated use of both the regular MRI gradient coils and the auxiliary gradient coil can produce considerably enhanced MRI system performance in certain applications. Such auxiliary magnetic gradient coil may be used, for example, to provide spoiler pulses between MRI spin echo subsequences, as diffusion gradient pulses in diffusion MRI studies or as the oscillating gradient used to form successive gradient echoes in echo planar imaging.

REFERENCES:
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patent: 5122748 (1992-06-01), Oh et al.
Crooks et al, "Echo-Planar Pediatric Imager", Radiology, 1988; vol. 166, No. 1, pp. 157-163.
Roemer et al, "High Speed, High Field, Planar Surface Gradient Assembly for Fast Imaging", SMRM, 1988; p. 134.
Yi et al, "Three Channel Surface Gradient Coil for High Resolution NMR Imaging", SMRM, 1990, p. 201.
Hajnal et al, "An Insert Gradient Coil Unit for Anisotropic Diffusions Studies of the Brain", JMRI, vol. 1, No. 2, Mar./Apr. 1991, p. 209.

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