Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1989-08-11
1991-07-02
Williams, Hezron E.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01R 3320
Patent
active
050288725
ABSTRACT:
A magnetic resonance imaging (MRI) system which includes a main shield member arranged in the cylindrical housing; and a sub shield member which is electrically connected to the main shield member and is arranged outside the housing to cover a region where the object under examination is placed. Thus, a magnetic resonance signal can be prevented from being electromagnetically mixed with the disturbance electromagnetic wave, and an MRI image can be accurately formed. The sub shield member covers only a desired region of a patient. For this reason, the patient can satisfactorily receive external light, the feeling of oppression can be greatly eliminated, and the shield member can be rendered compact. The sub shield member includes a lid shield member which is detachably attached to the main shield member, and a cover shield member which covers a portion extending from the main shield member. According to the intensity of a disturbance electromagnetic wave, the lid shield member and the cover shield member are selectively employed.
REFERENCES:
patent: 4564812 (1986-01-01), Van Dijk
patent: 4613820 (1986-09-01), Edelstein et al.
patent: 4642569 (1987-02-01), Hayes et al.
patent: 4725781 (1988-02-01), Roschmann
patent: 4785246 (1988-11-01), Sugimoto
Arana Louis M.
Kabushiki Kaisha Toshiba
Williams Hezron E.
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