Minimum basis set MR angiography

Details Minimum basis set MR angiography Minimum basis set MR angiography

1989-11-22

1991-07-23

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

050346946

ABSTRACT:
A radio frequency pulse (32), a gradient pulse (34), and a first frequency offset pulse (38a) are applied to cause the presaturation region (36a) adjacent one face of an imaging volume (30) such that material flowing into the imaging volume from that face is saturated. An imaging sequence is applied which generates magnetic resonance image data that has non-saturated flow in the imaging volume identified by a characteristic phase modulated intensity. The saturation and gradient pulses are applied again with a second frequency offset pulse (38b) to position the saturation region (36b) adjacent the opposite face of the image volume. The exact same imaging sequence is applied to generate a second set of image data in which non-saturated flowing material is identified by a characteristic phase modulated intensity. Magnitude values from these two data sets are reconstructed (72, 74) into image representations that are subtractively combined (76), to form a difference image representation. In the difference image representation, the static material has essentially a zero value, flowing material that entered from one face is strictly positive, and flowing material that entered from the other face is strictly negative. In this manner, two different flowing materials, such as venous and arterial blood, are separately encoded in only two imaging sequences.

REFERENCES:
patent: 4532473 (1985-07-01), Wehrli
patent: 4683431 (1987-07-01), Pattany et al.
patent: 4689560 (1987-08-01), Nayler et al.
patent: 4697147 (1987-09-01), Moran et al.
patent: 4728890 (1988-03-01), Pattany et al.
patent: 4849697 (1989-07-01), Cline et al.
patent: 4918386 (1990-04-01), Dumoulin et al.
Battocletti et al., "Clinical Applications . . . (NMR), Limb Blood Flowmeter", Proc. of the IEEE, vol. 67, No. 9, Sep. 1979, pp. 1359-1361.

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