Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1990-02-16
1991-10-08
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
050557890
ABSTRACT:
An MRI system applies a phase encoding gradient field, a read-out gradient field, and an RF field to an object which is placed in a homogeneous static field in accordance with a predetermined pulse sequence so as to excite MR at a specific slice plane of the object, thereby detecting an MR signal from the object and visualizing the slice plane. The system includes a data acquiring section for acquiring all the data required for image reconstruction of the slice portion excited by the RF field within a time in which magnetization in the slice plane is relaxed, by switching the read-out gradient field to positive and negative polarities, an image reconstructing section for obtaining positive and negative time phase images which are respectively based on data acquired when the read gradient field is at positive time phases and data acquired when the read gradient field is at negative time phases by performing image reconstruction based on the respective data, a correcting section for correcting an image degradation factor for each time phase images, and an image synthesizing section for obtaining an MR image of the slice portion by synthesizing both time phase images corrected by the correcting section.
REFERENCES:
patent: 4733188 (1988-03-01), Sekihara et al.
patent: 4818942 (1989-04-01), Rzedzian
patent: 4949042 (1990-08-01), Kuhara et al.
Sekihara et al., Image Restoration from Nonuniform Static Field Influence in Modified Echo-Planar Imaging, Med. Phys., vol. 14, No. 6, 1987, pp. 1087-1089.
Sekihara et al., New Reconstruction Technique for Echo-Planar Imaging to Allow Combined Use of Odd and Even . . . , Magnetic Resonance in Med., No. 5, 1987.
Guilfoyle et al., Chemical-Shift Imaging, Magnetic Resonance in Medicine, No. 2, 1985, pp. 479-489.
Kondo Masafumi
Satoh Kozo
Kabushiki Kaisha Toshiba
Tokar Michael J.
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