Correction of read-gradient polarity in EPI and grase MRI

Details Correction of read-gradient polarity in EPI and grase MRI Correction of read-gradient polarity in EPI and grase MRI

1994-09-14

1997-07-15

Lateef, Marvin M.

Surgery

Truss

Pad

324309, A61B 5055

Patent

active

056473621

ABSTRACT:
In an EPI or GRASE magnetic resonance method, phase errors caused by the alternation of the read gradient polarity (G.sub.x) are corrected by obtaining a set of reference measurements with both polarities at low values in the phase encoding (k.sub.y) direction. From these reference measurements the phase errors are estimated. Subsequently, the measurements covering the whole of k-space are corrected and a magnetic resonance image obtained in which artefacts due to the alternating polarity of the read gradient are suppressed.

REFERENCES:
patent: 4993075 (1991-02-01), Sekihara et al.
patent: 5055789 (1991-10-01), Kondo et al.
patent: 5084675 (1992-01-01), Reinfelder et al.
patent: 5151656 (1992-09-01), Maier et al.
patent: 5270654 (1993-12-01), Feinberg et al.
patent: 5304929 (1994-04-01), Fang et al.
patent: 5361028 (1994-11-01), Kanayama et al.
patent: 5378986 (1995-01-01), Seo et al.
"Cartesian Echo Planar Hybrid Scanning with Two To Eight Echos" G. Kashmar et al, IEEE Transactions on Medical Imaging, 10(1991) Mar., No. 1, pp. 1-10.
"GRASE (Gradient and Spin-Echo) MR Imaging" A New Fast Clinical Imaging Technique D. Feinberg et al, Radiology, vol. 181, (1991) pp.597-602.
"Image Reconstruction for Echo Planar Imaging with Nonequidistant K-Space Sampling" H. Bruder et al, Magn. Reson. Med. vol. 23, pp. 311-323 (1992).

Affiliated with

Also associated with

Rating

Correction of read-gradient polarity in EPI and grase MRI does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Correction of read-gradient polarity in EPI and grase MRI, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Correction of read-gradient polarity in EPI and grase MRI will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1485820