Nuclear magnetic resonance imaging apparatus

Details Nuclear magnetic resonance imaging apparatus Nuclear magnetic resonance imaging apparatus

1987-04-13

1989-12-26

Smith, Ruth S.

Surgery

Truss

Pad

324306, 324309, A61B 505

Patent

active

048891274

ABSTRACT:
A nuclear magnetic resonance imaging apparatus for deriving a signal from a moving part of an object to be imaged, includes a gradient magnetic field generator for applying a gradient magnetic field to the object; and a radio frequency magnetic field generator for applying a radio frequency magnetic field to the object to present a nuclear magnetic resonance phenomenon. Pulses of a 180 degree pulse method are generated to remove an adverse effect of ununiformity of a static magnetic field; two gradient magnetic fields having the same amplitude and grading oppositely to each other are applied at a certain time interval therebetween to the moving part of the object in the direction of motion of the moving object; a radio frequency magnetic field is generated by applying a pulse in the pulses of the 180 degree pulse method succeeding a 180 degree pulse at the time corresponding to the center of an echo signal generated by the 180 degree pulse, the radio frequency magnetic field making a nuclear spin vector at the stationary part of the object in parallel to the static magnetic field; a resonance signal is detected which is produced from the object upon application of the radio frequency magnetic field; the above process is performed to further obtain another resonance signal, reversing the polarities of the gradient magnetic fields; and a difference between the two resonance signals is derived as a signal from the moving part of the object.

REFERENCES:
patent: 4595879 (1986-06-01), Lent et al.
patent: 4609872 (1986-09-01), O'Donnell
patent: 4647857 (1987-03-01), Taber
patent: 4654591 (1987-03-01), Moran

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