Canon Medical Systems Corporation

Keiichiro Ishi

Mitsue Miyazaki

Takaya Mori

Yoshimori Kassai

Sadanori Tomiha

Masaaki Umeda

Satoshi Imai

Hiroki Kondo

Sho Tanaka

In one embodiment, a magnetic resonance imaging apparatus includes memory circuitry configured to store a predetermined program; and processing circuitry configured, by executing the predetermined program, to set an FSE type pulse sequence in which an excitation pulse is followed by a plurality of refocusing pulses, the plurality of the refocusing being divided into at least a first pulse group subsequent to the excitation pulse and a second pulse group subsequent to the first pulse group, the first pulse group including refocusing pulses having a predetermined high flip angle, and the second pulse group including refocusing pulses having flip angles decreased from the predetermined high flip angle toward a flip angle of zero, and generate an image of an object from respective MR signals corresponding to the plurality of refocusing pulses acquired by applying the fast spin echo type pulse sequence to the object.

Magnetic resonance imaging apparatus

According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry calculates power of a first RF magnetic field required for excitation at a first flip angle in a first target slice, acquires information on inhomogeneity of a transmission RF magnetic field for a cross section crossing the first target slice, and calculate power of a second RF magnetic field required for excitation at a second flip angle in a second target slice different from the first target slice for the cross section by using the information and the first RF magnetic field power.

A magnetic resonance imaging apparatus according to an embodiment includes a transmission coil and processing circuitry. The transmission coil is configured to apply a high frequency magnetic field to an object. The processing circuitry is configured to: derive, based on at least one of an imaging region and the body shape data of the object, a specific area in a field of view (FOV); and determine, based on a signal within the specific area, an output power level of a high frequency pulse signal supplied to the transmission coil.

According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry and sequence control circuitry. The processing circuitry specifies a position of an imaging target of a subject in a bore, using an image collected by a first imaging protocol. The processing circuitry determines, in accordance with the specified position, a correction value for a phase of an RF pulse and/or a correction value for an amplitude of the RF pulse, the RF pulse being related to a transmit RF wave, so that non-uniformity in a magnetic field of the transmit RF wave transmitted to the imaging target can be corrected. The sequence control circuitry executes a second imaging protocol for the subject, using the determined correction value.

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Nasushiobara, Japan

Keiichiro Ishi