Magnetic resonance imaging apparatus

Details Magnetic resonance imaging apparatus Magnetic resonance imaging apparatus

1992-08-28

1995-01-03

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300

Patent

active

053789865

ABSTRACT:
Where an imaging volume of an object under examination is comprised of eight slices with four regions "a", "b", "c", and "d" per slice (on the k space), the RF pulse frequency, the slice-selection gradient magnetic field, and the phase-encoding gradient magnetic field are controlled so as to first acquire data for a region "a" of each of the slices #1 to #8 in sequence and then acquire data for the slices #1 to #8 for each of the regions "b" to "d" in sequence. The data with 4 rows and 8 columns thus obtained for each of the regions of the slices is rearranged into data with 8 rows and 4 columns arranged for each of the slices. Data in each row are subjected to two-dimensional Fourier transformation, so that an MR image corresponding to each slice is reconstructed. This permits the RF pulse repetition time TR to be made long even if a time interval between successive data acquisition is made short. Thus, a multi-slice divisional-scanning type magnetic resonance imaging apparatus can be realized, which permits T2 contrast images with high signal-to-noise ratio to be obtained in a short time.

REFERENCES:
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patent: 4767991 (1988-08-01), Rzedzian
patent: 4845430 (1989-07-01), Nakabayashi
patent: 5237273 (1993-08-01), Plewes et al.
J. Hennig, A. Nauerth, and H. Friedburg, "RARE Imaging: A Fast Imaging Method for Clinical/MR," Magnetic Resonance In Medicine 3, pp. 823-833 (1986).
Koichi Oshio and David A. Feinberg, "GRASE (Gradient-and Spin-Echo) Imaging: A Novel Fast MRI Technique," Magnetic Resonance In Medicine 20, pp. 344-349 (1991).

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