Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1988-06-07
1990-01-02
Chapman, John
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01R 3320
Patent
active
048915963
ABSTRACT:
A magnetic resonance imaging apparatus has a first surface coil for detecting a magnetic resonance signal induced in an object under examination. An induction current flows through the first surface coil by the magnetic resonance signal. A second surface coil is arranged to oppose the first surface coil through the object to be examined. The second surface coil is electrically endless. Therefore, a magnetic field is generated by the induction current. The magnetic field changes in accordance with a change in magnetic resonance signal. An eddy current flows through the second surface coil without flowing through the object to be examined in order to interfere with a change in magnetic field. As a result, an eddy current can be prevented from flowing through the object to be examined.
REFERENCES:
patent: 4725779 (1988-02-01), Hyde et al.
patent: 4817612 (1989-04-01), Akins et al.
I. R. Young et al., "Aspects of the Engineering Design of Whole-Body Nuclear Magnetic Resonance Machines", IEE Proceedings, vol. 134, Pt. A, No. 2, Feb. 1987, pp. 143-160.
P. Roschmann et al., "Die Bedeutung der HF-Spulen fur die Kernspintomographie The Importance of RF-Coils for the Magnetic Resonance Tomography", Biomed. Technik 31 (1968), pp. 178-185.
Chapman John
Fess Lawrence G.
Kabushiki Kaisha Toshiba
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