Magnetic resonance imaging (MRI) using SPIR and/or chess suppression pulses
A magnetic resonance imaging (MRI) apparatus includes an MRI imaging condition setting unit configured to set an imaging condition frequency-selectively applying a first suppression pulse for suppressing fat and further frequency-selectively applying a second suppression pulse to the fat after applying the first suppression pulse, a slip angle of the second suppression pulse differing from that of the first suppression angle, and the second suppression pulse further suppressing remaining fat after applying the first suppression pulse. The image data acquisition unit acquires image data according to the imaging condition.
1. A magnetic resonance imaging (MRI) apparatus comprising:
an MRI imaging condition setting unit configured to set an imaging condition applying a first suppression pulse and a second suppression pulse each suppressing at least one of fat and silicone; and
an image data acquisition unit configured to acquire image data according to the imaging condition,
wherein the first and second suppression pulses are successively applied prior to an associated imaging pulse sequence,
the first suppression pulse suppresses a signal of the at least one of fat and silicone,
the second suppression pulse further suppresses the signal remaining after application of the first suppression pulse,
the first suppression pulse flips a longitudinal magnetization of the at least one of fat and silicone such that the longitudinal magnetization becomes negative, and
at least one of a flip angle of the first suppression pulse, a flip angle of the second suppression pulse, and a time interval between the first and second suppression pulses is adjusted such that the longitudinal magnetization of the at least one of fat and silicone becomes zero at application time of the associated imaging pulse sequence,
the flip angle of the second suppression pulse is set to be smaller than the flip angle of the first suppression pulse, and
the flip angle of the second suppression pulse is set according to a type of the associated imaging pulse sequence.
2. The magnetic resonance imaging apparatus of claim 1 ,
wherein the MRI imaging condition setting unit is configured to set a first period to be different from a second period, the first period being a period between the first suppression pulse and the second suppression pulse, and the second period being a period between the second suppression pulse and an imaging pulse of the associated imaging pulse sequence.
3. The magnetic resonance imaging apparatus of claim 2 ,
wherein the MRI imaging condition setting unit is configured to set the first period to be different from the second period, based on a T1 value of the fat.
4. The magnetic resonance imaging apparatus of claim 2 ,
wherein the MRI imaging condition setting unit is configured to set the flip angle of second suppression pulse, depending on a T1 value of the fat, the flip angle of the first suppression pulse, the first period, and the second period.
5. The magnetic resonance imaging apparatus of claim 2 ,
wherein the first suppression pulse is a fat suppression pulse that selectively suppresses the fat by using a longitudinal relaxation of the fat.
6. The magnetic resonance imaging apparatus of claim 2 ,
wherein the MRI imaging condition setting unit is configured to set the first period such that a longitudinal magnetization of the fat becomes a null point.
7. The magnetic resonance imaging apparatus of claim 1 ,
wherein the MRI imaging condition setting unit is configured to set the flip angle of the first suppression pulse to be different from that of the second suppression pulse, based on a T1 value of the fat.