JP2003319917A5 - - Google Patents

Claims (6)

  The moments of all gradient magnetic fields except the gradient magnetic field in the encode direction are the period between the center time of the applied RF pulse and the peak arrival time of the echo signal generated in response to the application of the RF pulse, and the echo signal. Is zero in each of the periods between the peak arrival time and the center time of the RF pulse applied after this echo signal, and the moment due to the gradient magnetic field in the encode direction is zero between the center times of the applied RF pulses. The echo signal is received by executing a pulse sequence that satisfies the condition that the phase difference of the RF pulse to be applied is constant, and the processed data of the echo signal is arranged in the frequency space, In the magnetic resonance imaging apparatus for generating an image based on the arranged data, the frequency sky Magnetic resonance imaging apparatus, wherein the data from the high-frequency region in the order of the low-frequency region with a applying means for applying said encoding magnetic field gradient which is set so as to be arranged on the frequency space.   The moments of all gradient magnetic fields except the gradient magnetic field in the encode direction are the period between the center time of the applied RF pulse and the peak arrival time of the echo signal generated in response to the application of the RF pulse, and the echo signal. Is zero in each of the periods between the peak arrival time and the center time of the RF pulse applied after this echo signal, and the moment due to the gradient magnetic field in the encode direction is zero between the center times of the applied RF pulses. The echo signal is received by executing a pulse sequence that satisfies the condition that the phase difference of the RF pulse to be applied is constant, and the processed data of the echo signal is arranged in the frequency space, In a magnetic resonance imaging apparatus that generates an image based on the arranged data, the longitudinal magnetization of the spin An application means for applying the gradient magnetic field in the encoding direction set so that the data collected in a steady state in which the magnitude of the component can be regarded as constant is arranged at the center of the frequency space is provided. Magnetic resonance imaging device.   3. The magnetic resonance imaging apparatus according to claim 1, wherein the application unit is configured so that an arrangement of the data in the frequency space is a region having a reverse polarity centered on zero encoding in a phase encoding direction in the frequency space. A magnetic resonance imaging apparatus which is means for applying the encoding-direction gradient magnetic field set so as to be alternately performed with time.   4. The magnetic resonance imaging apparatus according to claim 1, wherein the pulse sequence includes a pulse train of a two-dimensional scan in which the encoding direction gradient magnetic field is a phase encoding direction gradient magnetic field. 5. .   4. The magnetic resonance imaging apparatus according to claim 3, wherein the pulse sequence includes a pulse train of a three-dimensional scan in which the encoding direction gradient magnetic field is a phase encoding direction gradient magnetic field and a slice direction gradient magnetic field, and the application unit includes A magnetic resonance imaging apparatus configured to arrange the data in each segment region obtained by segmenting a frequency space in the alternating order. In a magnetic resonance imaging apparatus that receives an echo signal by executing a pulse sequence using the FISP method, arranges data obtained by processing the echo signal in a frequency space, and generates an image based on the arranged data.
  The magnetic resonance imaging apparatus according to claim 1, wherein the data is arranged in the frequency space in order from a high frequency region to a low frequency.