Method of NMR imaging which overcomes T/sub 2/ effects in an inhomogeneous static magnetic field

Patent · Tue Sep 11 04:00:00 EDT 1984

OSTI ID:5698358

Edelstein, W A; Bottomley, P

The T/sub 2/ effects due to inherent inhomogeneities in the static magnetic field are overcome by the use of a 180/sup 0/ RF pulse to produce a nuclear spin echo suitable for obtaining spatial information and by the adjustment of the pulsed gradients such that the occurrence of the spin echo due to the applied gradients coincides with the occurrence of the nuclear spin echo derived from the rephasing of spins in the presence of the inhomogeneities inherent in the main static magnetic field. The 180/sup 0/ RF pulse is applied with the imaging gradients turned off so that long RF pulse lengths can be used, thus reducing RF power requirements. Exemplary applications of the pulse method to multiple angle projection reconstruction and two-dimensional Fourier transform (spin warp imaging) imaging techniques are also described.

• Assignee: General Electric Co.
• Patent Number(s): US 4471306
• OSTI ID: 5698358
• Country of Publication: United States
• Language: English

Related Subjects

440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ELECTROMAGNETIC RADIATION
ELECTROSTATICS
FOURIER TRANSFORMATION
IMAGE PROCESSING
INTEGRAL TRANSFORMATIONS
MAGNETIC FIELDS
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
POWER INPUT
PROCESSING
PULSES
RADIATIONS
RADIOWAVE RADIATION
RELAXATION
RELAXATION TIME
RESONANCE
RF SYSTEMS
SPIN ECHO
SPIN-SPIN RELAXATION
TRANSFORMATIONS