Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2006-06-06
2006-06-06
Shrivastav, Brij B. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
C324S318000
Reexamination Certificate
active
07057388
ABSTRACT:
The invention relates to a method for magnetic resonance imaging (MRI) of at least a portion of a body placed in a stationary and substantially homogeneous main magnetic field. The method comprises the steps of subjecting the body to a diffusion-weighting sequence (DW1), generating a train of MR echoes (E1,E2,E3,E4,E5) by an imaging sequence (EPI1), and measuring this train of MR echoes. These steps are repeated until a complete imaging data set with a sufficient number of phase-encoding steps is measured. Thereafter, the imaging data set is corrected for macroscopic motions by means of an individual phase-correction of each train of MR echoes. Finally, an image is reconstructed from the imaging data. In order to provide a method for diffusion-weighted imaging, which requires a minimum additional measurement time for determining the phase errors of the imaging signals and which also guarantees a robust compensation of image artifacts caused by macroscopic motions of the body of the examined patient, the invention suggests to select the phase-encoding scheme of the imaging sequence such that each train of MR echoes (E1,E2,E3,E4,E5) comprises at least one initial MR navigator echo (E1), which forms and integral part of the imaging data set, wherein the phase-correction is derived from the MR navigator echo.
REFERENCES:
patent: 6076006 (2000-06-01), Van Den Brink
patent: 6307369 (2001-10-01), Felmlee et al.
patent: 6518759 (2003-02-01), Bernstein
patent: 6859203 (2005-02-01), van Muiswinkel et al.
patent: 2003/0160612 (2003-08-01), Yablonskiy et al.
patent: 1 094 331 (2001-04-01), None
patent: WO 02/068978 (2002-09-01), None
Bammer, R., et al.; Diffusion-weighted Imaging with Navigated Interleaved Echo-planar Imaging; 1999; Radiology; 211:799-806.
Bosak, E., et al.; Navigator motion correction of diffusion weighted 3D SSFP imaging; 2001; MRM in Physics, Biology & Medicine; 12:167-176.
Dietrich, O., et al.; Diffusion-weighted imaging of the spine using radial k-space trajectories; 2001; MRM in Physics, Biology & Medicine; 12:23-31.
Harvey Paul Royston
Van Den Brink Johan Samuel
Koninklijke Philips Electronics , N.V.
Lundin Thomas M.
Shrivastav Brij B.
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