Method of acquiring NMR angiograms in selected flow component di

Details Method of acquiring NMR angiograms in selected flow component di Method of acquiring NMR angiograms in selected flow component di

1990-03-22

1991-06-25

Smith, Ruth S.

Surgery

Truss

Pad

324306, A61B 5055

Patent

active

050257889

ABSTRACT:
Several sequences of radio-frequency and magnetic field gradients are presented for obtaining from a sample multiple response echo signals from which to obtain a plurality of independent angiograms, which can be combined or separately analyzed to provide more information than an individual angiogram, but in substantially the same amount of time as a single angiogram. For example, a series of angiograms, each with a different projection axis, can be obtained in the time required to obtain a single angiogram using a single echo method. If the view angle of each echo is the same, then the acquired angiograms can be added to enhance the signal-to-noise ratio. Another pulse sequence simultaneously obtains two or more angiograms, each sensitive to one of two orthogonal flow components of the overall blood flow; the angiograms are then added to give an angiogram which is sensitive to total flow in all directions. Multiple velocity ranges are accommodated in a fourth sequence form.

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