Magnetic field coil and magnetic resonance imaging apparatus
AssigneeHitachi, Ltd.
InventorsYosuke Otake, Yoshihisa Soutome, Koji Hirata, Yoshitaka Bito
Life of this patent
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Abstract
Provided is an RF coil which can highly efficiently and uniformly irradiate a RF magnetic field having two or more magnetic resonance frequencies close to each other, and receive magnetic resonance signals of two or more magnetic resonance frequencies close to each other with high sensitivity and uniform sensitivity profile in an MRI apparatus. Two or more frequencies to which the coil is tuned are adjusted so as to be between resonance frequencies of series resonant circuits constituting the RF coil.
Claims17
A RF coil for magnetic resonance imaging apparatus, tuned to at least two different resonant frequencies, comprising:
- a first series resonant circuit comprising a loop coil made of a conductive material and one or more capacitors inserted into the loop coil,
- a first circuit connected in parallel to the first series resonant circuit, and
- a signal processing circuit connected in parallel to the first circuit, and having two or more different resonance frequencies,
- wherein:
- the first circuit comprises one or more capacitors and one or more inductors, and is connected in parallel with at least two series resonant circuits each having different resonance frequencies,
- the resonance frequencies of the at least two series resonant circuits also differ from resonance frequency of the first series resonant circuit, and
- each of the resonance frequencies of the RF coil are adjusted so as to be between the resonance frequency of the first series resonant circuit and the resonance frequencies of the at least two series resonant circuits.
A RF coil for magnetic resonance imaging apparatus, tuned to at least two different resonant frequencies, comprising:
- a first series resonant circuit comprising a loop coil made of a conductive material and one or more capacitors inserted into the loop coil,
- a second series resonant circuit comprising one or more capacitors and one or more inductors connected in series and connected in parallel to the first series resonant circuit,
- a third series resonant circuit comprising one or more capacitors and one or more inductors connected in series and connected in parallel to the second series resonant circuit, and
- a signal processing circuit connected in parallel to the third circuit,
- wherein:
- resonance frequency fA of the first series resonant circuit, resonance frequency fB of the second series resonant circuit, resonance frequency fC of the third series resonant circuit, first resonance frequency f1 and second resonance frequency f2 of the RF coil are adjusted so as to satisfy a relation of fB<f1<fA<f2<fC.
Dependencies are inferred from the claim text.