Out-of-slice artifact reduction technique for magnetic resonance

Details Out-of-slice artifact reduction technique for magnetic resonance Out-of-slice artifact reduction technique for magnetic resonance

1989-06-29

1990-09-25

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

049596110

ABSTRACT:
In-slice magnetic resonance is excited with a 90.degree. RF pulse (50, 50'). A 180.degree. RF pulse (56, 56') is applied to cause a magnetic resonance spin echo (58, 58'). However, the 180.degree. pulse also induces resonance in material outside the selected slice. The out-of-slice data is superimposed on the magnetic resonance spin echoes. Two views of magnetic resonance data are collected with the same phase encode gradient and stored temporarily in first and second memories (72, 74). The views are combined (76) such that the out-of-slice data sums and the in-slice data cancels. The magnitude of the out-of-slice data is magnitude adjusted (78) to create an out-of-slice magnetization view which is stored in an out-of-slice magnetization memory (80). A plurality of views with different phase encode gradients are subsequently collected during a magnetic resonant imaging sequence. Each view is subtracted from (90) the out-of-slice data view and transformed (92) into an image representation.

REFERENCES:
patent: 4484138 (1984-11-01), Bottomley et al.
patent: 4706026 (1987-11-01), Pelc et al.
patent: 4777438 (1988-10-01), Holland
patent: 4870361 (1989-09-01), Kleef et al.

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