Method of and device for the imaging of objects by means of magn

Details Method of and device for the imaging of objects by means of magn Method of and device for the imaging of objects by means of magn

1997-03-17

1998-09-22

Lateef, Marvin M.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

324307, 324309, A61B 505

Patent

active

058107274

ABSTRACT:
In a magnetic resonance method for imaging a part of a body which is arranged in a steady magnetic field, magnetic resonance signals are measured utilizing an initial read gradient and an alternating read gradient. The method can be used, for example for phase contrast angiography and for flow velocity measurements in a body of a patient. In order to counteract artifacts in the image due to inhomogeneities of the steady magnetic field, the time elapsing between an excitation RF pulse exciting spins in the part of the body and the initial read gradient is varied in successive pulse sequences. However, this causes artifacts in the fluid flow images due to the phase error which itself is caused by the spins flowing in the direction of the gradient field. In order to counteract these artifacts, the first-order moment of the initial read gradient and a first order lobe of the alternating read gradient is kept substantially constant in each pulse sequence.

REFERENCES:
patent: 4707660 (1987-11-01), Cuppen et al.

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