MR imaging apparatus

Details MR imaging apparatus MR imaging apparatus

1994-09-02

1996-08-20

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300, G01V 314

Patent

active

055482155

ABSTRACT:
An MR imaging apparatus using NMR phenomenon includes a main magnet for generating a uniform static magnetic field in an imaging space, a first to a third gradient field coils, an RF coil for emitting an excitation RF pulse and a plurality of refocus RF pulses and detecting echo signals, an RF emitter for modulating and emitting the excitation RF pulse and refocus RF pulses with predetermined timing through the RF coil, and a slice-selecting gradient field pulse generator. A phase-encoding gradient field pules generator and a reading gradient field pulse generator are provided, along with a data collector for detecting, with a predetermined frequency (reference frequency), the echo signals detected by the RF coil, and collecting data therefrom. A phase detector determines phase differences of echo peaks in the echo signals with respect to the reference frequency, respectively. A rotating device rotates the data collected from the echo signals based on the phase differences to connect phases of the echo signals to be continuous, and a data processor is provided for reconstructing a sectional image based on the rotated data.

REFERENCES:
patent: 4649345 (1987-03-01), Yoda et al.
patent: 4684891 (1987-08-01), Feinberg
patent: 5184073 (1993-02-01), Takeuchi et al.
patent: 5422576 (1995-06-01), Kao et al.
"Cartesian Echo Planar Hybrid Scanning with Two to Eight Echoes," 8197 IEEE Transactions on Medical Imaging 10 (1991) Mar., No. 1, pp. 1-10, G. Kashmar et al.
"Fast MRI by Creating Multiple Spin Echoes in a CPMG Sequence," 8306 Magnetic Resonance in Medicine 30 (1993) Aug., No. 2, pp. 251-254, Koichi Oshio et al.

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