Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2006-12-26
2010-10-05
Shrivastav, Brij B (Department: 2831)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S322000
Reexamination Certificate
active
07808241
ABSTRACT:
A vertical magnetic field type MRI apparatus is capable of high-speed-imaging a large cross section such as a whole human body while suppressing an increase in the number of channels and maintaining sensitivity to a deep portion of a subject to be high. A receiving coil is composed of a plurality of sub coils. A first sub coil (3-1) of the receiving coil is arranged in a first plane (1001) including an axis substantially parallel to the direction of a static magnetic field and forms a first current loop around the surface of the subject. A second sub coil (5-1) of the receiving coil is constituted by a pair of conductor loops (5-2, 5-3) that sandwich the subject in the vicinities of the surface of the subject and are arranged substantially symmetrically each other. The conductor loops have respective cross points (5-4, 5-5). The conductor loops are arranged with the first sub coil to ensure that the cross points are located in the first plane in which the current loop of the first sub coil is provided. An electromagnetic coupling between the first and second sub coils is not generated. The second sub coil exhibits a sensitivity distribution symmetrical to the direction of the static magnetic field. The first and second sub coils are arranged as a basic configuration and combined with each other to ensure that an electromagnetic coupling with another sub coil that exhibits a sensitivity distribution symmetrical to x and y directions is suppressed.
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Dohata Masayoshi
Miyamoto Yoshiyuki
Ochi Hisaaki
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Hitachi Medical Corporation
Shrivastav Brij B
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