Method for reducing image artifacts due to periodic signal variations in NMR imaging

Patent · Tue Nov 10 04:00:00 EST 1987

OSTI ID:5730504

Pelc, N J; Glover, G H

A method is described for reducing artifacts in a desired image due to unwanted substantially periodic signal variations of NMR signals sensed in views of a portion of an object being examined using nuclear magnetic resonance techniques. Each view includes irradiation of the object portion by an RF excitation pulse at the Larmor frequency to produce one of the NMR signals. The technique application of a pulsed magnetic field gradient for spatial encoding along at least one dimensional axis of the object. The magnetic field gradient has spatial encoding parameter values. Each value corresponds to a respective view so as to encode spatial information into the NMR signals. The method comprises the steps of: (a) determining a period T/sub B/ of the unwanted signal variations; and (b) selecting a temporal order of application of the gradient parameter values to produce a sequence of the NMR signals such that reordering of the NMR signals provides an apparent period of signal variation other than the period T/sub B/.

• Assignee: General Electric Co., Milwaukee, WI
• Patent Number(s): US 4706026
• OSTI ID: 5730504
• Country of Publication: United States
• Language: English

Related Subjects

440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
DESIGN
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FUNCTION GENERATORS
IMAGE PROCESSING
IMAGES
LARMOR RADIUS
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
PROCESSING
PULSE CIRCUITS
PULSE GENERATORS
RESONANCE
RF SYSTEMS
SIGNAL CONDITIONERS
SIGNAL CONDITIONING