Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1992-08-12
1994-05-17
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01V 300
Patent
active
053131630
ABSTRACT:
A method for suppressing sampling-ring artifacts produced by spiral-scan-based 2D selective excitation pulses, such as a those exciting a `pencil-shaped` region, employs a 2D annular saturation pulse followed by a gradient `crusher` lobe which dephases the transverse magnetization in the annular region. The annular saturation pulse is itself based on a spiral k-space trajectory having a limited number of cycles and a small outer radius, and is designed to saturate magnetization of tissue of the subject corresponding to the artifact rings of an excitation region while not affecting a central region. The annular saturation pulse may also be reshaped to limit the peak RF power to levels currently used for clinical MR imaging, while preserving bandwidth and the 2D excitation profile.
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patent: 5105152 (1992-04-01), Pauly
patent: 5122747 (1992-06-01), Riederer et al.
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Reprint, Journal of Computer Assisted Tomography, Christopher J. Hardy, Justin D. Pearlman, James R. Moore, Peter B. Roemer & Harvey E. Cline, "Rapid NMR Cardiography With A Half-Echo M-Mode Method", 1991, pp. 868-874.
Hardy Christopher J.
Nieters Edward J.
Arana Louis
General Electric Company
Snyder Marvin
Zale Lawrence P.
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