Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2007-04-03
2007-04-03
Shrivastav, Brij (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
Reexamination Certificate
active
10489986
ABSTRACT:
Conventional gradient echo sequences with relatively long echo-times visualise complex flow as signal loss, the degree and extent of which is a qualitative indicator of valvular heart disease. Since the long echo-time precludes segmentation, breath-hold imaging is not possible and acquisitions typically take 2-minutes with respiratory motion artefact being a frequent problem. In the present invention, a segmented sequence is used which generates similar degrees of signal loss to a conventional gradient echo sequence. However, the acquisition duration is reduced and breath-hold imaging is feasible, removing respiratory motion artefact.
REFERENCES:
patent: 5093620 (1992-03-01), Pelc et al.
patent: 5101156 (1992-03-01), Pelc
patent: 5204625 (1993-04-01), Cline et al.
patent: 5438992 (1995-08-01), Siegel et al.
patent: 6031374 (2000-02-01), Epstein et al.
patent: 6259940 (2001-07-01), Bernstein et al.
patent: 6393313 (2002-05-01), Foo
patent: 6806709 (2004-10-01), Markl et al.
Keegan, J. et al., “Breath-hold Signal Loss Sequence for the Qualitative Assessment of Blood Flow Disturbances in Cardiovascular MR”, Proceedings of the International Society for Magnetic Resonance in Medicine, Tenth Scientific Meeting and Exhibition, May 18-24, 2002, conferences abstract.
Foo, T.K.F., et al., “Improved Ejection Fraction and Flow Velocity Estimates with Use of View Sharing and Uniform Repetition Time Excitation with Fast Cardiac Techniques”, Radiology, May 1995, vol. 195, No. 2, pp. 471-478.
Westenberg, J.J.M., et al., MRA Stenosis Quantification in Flow Phantoms and Renal Arteries, Proceedings of the International Society for Magnetic resonance in Medicine, Sixth Scientific Meeting and Exhibition, Apr. 18-24, 1998, vol. 2, p. 832, conference abstract.
International Search Rpt of PCT/GB02/04222 dated Mar. 4, 2003.
Forster, J. et al., “Fast Acceleration-encoded Magnetic Resonance Imaging”, Medical Physics, Jan. 2001, vol. 28. No. 1, pp. 28-35.
Keegan, J. et al., “The Application of Breath Hold Phase Velocity Mapping Techniques To The Measurement of Coronary Artery Blood Flow Velocity: Phantom Data And Initial In Vivo Results” Magnetic Resonance Medicine, May 1, 1995, vol. 31, No. 5, pp. 526-536.
Firmin David
Keegan Jennifer
Daly, Crowley & Mofford & Durkee, LLP
Royal Brompton & Harefield NHS Trust
Shrivastav Brij
Vargas Dixomara
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