Method of eliminating effects of spurious free induction decay NMR signal caused by imperfect 180 degrees pulses

Patent · Tue Nov 20 04:00:00 EST 1984

OSTI ID:5865204

Bottomley, P A; Edelstein, W A

A method for eliminating the effects of a spurious free induction decay (FID) NMR signal due to imperfect 180/sup 0/ RF pulses comprises applying a large magnitude, short duration magnetic field gradient pulse, termed the ''crusher'' pulse immediately following the 180/sup 0/ pulse. When the method is employed with NMR pulse sequences in which the 180/sup 0/ pulse is part of a spin echo type refocusing RF pulse sequence, the 180/sup 0/ pulse is preceded by a magnetic field gradient pulse termed the ''primer'', having an equal integral with respect to time as the crusher pulse. The method is effective in removing NMR image artifacts produced by spurious FID in both planar and three-dimensional NMR imaging methods.

• Assignee: General Electric Company
• Patent Number(s): US 4484138
• OSTI ID: 5865204
• Country of Publication: United States
• Language: English

Related Subjects

440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
DECAY
ELECTROMAGNETIC RADIATION
IMAGE PROCESSING
INDUCTION
MAGNETIC FIELDS
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
PROCESSING
PULSE RISE TIME
PULSE TECHNIQUES
PULSES
RADIATIONS
RADIOWAVE RADIATION
RESONANCE
RF SYSTEMS
SIGNALS
SPIN ECHO
TIMING PROPERTIES