High frequency magnetic field coil and magnetic resonance imaging apparatus with the same
First Claim
1. A high frequency magnetic field coil of a magnetic resonance imaging apparatus whose resonance frequency is a magnetic resonant frequency of a first nuclide, comprising:
- a sub coil disposed at a point at which it can instantaneously inductively couple with the high frequency magnetic field coil; and
a conduction control unit that controls conduction of the sub coil,wherein, at a time of the conduction, the sub coil instantaneously inductively modifies the resonance frequency of the high frequency magnetic field coil to be a magnetic resonant frequency of a second nuclide that has a higher magnetic resonant frequency than the magnetic resonant frequency of the first nuclide,wherein, at a time of no conduction, the resonance frequency of the high frequency magnetic field coil also instantaneously reverts to the resonant frequency of the first nuclide, andwherein the magnetic resonance imaging apparatus is capable of performing plural nuclide imaging over the entire area of the subject with only the high frequency magnetic field coil being resonant.
1 Assignment
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Accused Products
Abstract
An RF coil for MR Imaging that can change a resonance frequency easily and instantaneously in response to a nuclide to be imaged without exchange and adjustment and that also causes only small lowering of sensitivity. The RF coil has a sub coil for changing a resonance frequency of the transmitting/receiving RF coil for transmitting and receiving an MR signal between itself and a nuclide that is an object to be imaged. The sub coil is equipped with a switch, and at the time of switching-on, shifts the resonance frequency of the RF coil by changing an inductance value of the RF coil in a noncontact manner using inductance coupling.
36 Citations
16 Claims
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1. A high frequency magnetic field coil of a magnetic resonance imaging apparatus whose resonance frequency is a magnetic resonant frequency of a first nuclide, comprising:
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a sub coil disposed at a point at which it can instantaneously inductively couple with the high frequency magnetic field coil; and a conduction control unit that controls conduction of the sub coil, wherein, at a time of the conduction, the sub coil instantaneously inductively modifies the resonance frequency of the high frequency magnetic field coil to be a magnetic resonant frequency of a second nuclide that has a higher magnetic resonant frequency than the magnetic resonant frequency of the first nuclide, wherein, at a time of no conduction, the resonance frequency of the high frequency magnetic field coil also instantaneously reverts to the resonant frequency of the first nuclide, and wherein the magnetic resonance imaging apparatus is capable of performing plural nuclide imaging over the entire area of the subject with only the high frequency magnetic field coil being resonant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A magnetic resonance imaging apparatus, comprising:
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a static magnetic field formation unit that forms a static magnetic field; a gradient magnetic field formation unit that forms a gradient magnetic field; a high frequency magnetic field formation unit that forms a high frequency magnetic field; a transmitting/receiving coil that irradiates the high frequency magnetic field on a subject and detects magnetic resonance signals generated from the subject, the resonance frequency of the transmitting/receiving coil being the same as a magnetic resonant frequency of a first nuclide; a reception unit that receives the magnetic resonance signals; a control unit that controls the gradient magnetic field formation unit, the high frequency magnetic field formation unit, and the reception unit; a sub coil disposed at a point at which it can instantaneously inductively couple with the high frequency magnetic field coil; and a conduction control unit that controls conduction of the sub coil, wherein, at a time of the conduction, the sub coil instantaneously inductively modifies the resonance frequency of the high frequency magnetic field coil to be a magnetic resonant frequency of a second nuclide that has a higher magnetic resonant frequency than the magnetic resonant frequency of the first nuclide, wherein, at a time of no conduction, the resonance frequency of the high frequency magnetic field coil also instantaneously reverts to the resonant frequency of the first nuclide, and wherein the magnetic resonance imaging apparatus is capable of performing plural nuclide imaging over the entire area of the subject with only the high frequency magnetic field coil being resonant. - View Dependent Claims (14, 16)
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13. A magnetic resonance imaging apparatus, comprising:
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a static magnetic field formation unit that forms a static magnetic field; a gradient magnetic field formation unit that forms a gradient magnetic field; a high frequency magnetic field formation unit that forms a high frequency magnetic field; a transmitting coil that irradiates the high frequency magnetic field on a subject; a receiving coil that detects magnetic resonance signals generated from the subject; a reception unit that receives the magnetic resonance signals; and a control unit that controls the gradient magnetic field formation unit, the high frequency magnetic field formation unit, and the reception unit, wherein the transmitting coil or the receiving coil is a high frequency magnetic field coil, whose resonance frequency is a magnetic resonant frequency of a first nuclide and includes a sub coil having a conduction control unit that controls conduction thereof, wherein the sub coil is disposed at a point at which it can instantaneously inductively couple with the high frequency magnetic field coil, wherein, at a time of the conduction, the sub coil instantaneously inductively modifies the resonance frequency of the high frequency magnetic field coil to be a magnetic resonant frequency of a second nuclide that has a higher magnetic resonant frequency than the magnetic resonant frequency of the first nuclide, wherein, at a time of no conduction, the resonance frequency of the high frequency magnetic field coil also instantaneously reverts to the resonant frequency of the first nuclide, and wherein the magnetic resonance imaging apparatus is capable of performing plural nuclide imaging over the entire area of the subject with only the high frequency magnetic field coil being resonant. - View Dependent Claims (15)
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Specification