Magnetic resonance imaging system

Details Magnetic resonance imaging system Magnetic resonance imaging system

1990-02-23

1991-11-05

Williams, Hezron E.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324309, G01V 300

Patent

active

050633481

ABSTRACT:
In an MRI system, an RF field and slicing, phase encoding, and read-out gradient fields are applied to an object to be examined which is placed in a homogeneous static field in a predetermined sequence. An MR signal from a region of interest in the object is received through a probe, and is detected by a detection circuit using a predetermined reference wave. A detection output from the synchronous detection circuit is sampled to acquire MR signal data and to obtain diagnostic data. The system includes a reference wave control section for shifting the frequency and phase of the reference wave, by predetermined amounts, from the frequency and phase of an MR signal when the phase encoding and read-out gradient fields are zero. The reference wave control section changes a frequency shift value of the reference wave to positive and negative phases in synchronism with switching of the gradient fields, and changes a phase shift value of the reference wave stepwise.

REFERENCES:
patent: 4665366 (1987-05-01), Macovski
patent: 4734648 (1988-03-01), Machida et al.
patent: 4772850 (1988-09-01), Kasugai
patent: 4862083 (1989-08-01), McKinnon et al.
"Doubly Tuned Local Coils for MRI and MRS at 1.5T", vol. 6, No. 3, Magnetic Resonance in Medicine, T. M. Grist et al., Mar. 1988, pp. 253-264.

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