MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD
A magnetic resonance imaging apparatus includes processing circuitry configured to collect a plurality of magnetic resonance signals while changing relative relationship between echoes and acquisition windows, and generate a magnetic resonance image based on data obtained by combining the plurality of magnetic resonance signals.
1 . A magnetic resonance imaging apparatus, comprising processing circuitry configured to:
collect a plurality of magnetic resonance signals while changing relative relationship between echoes and acquisition windows; and
generate a magnetic resonance image based on data obtained by combining the plurality of magnetic resonance signals.
2 . The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is configured to collect the plurality of magnetic resonance signals while changing the relative relationship by shifting the acquisition windows by a width smaller than a sampling interval.
3 . The magnetic resonance imaging apparatus according to claim 2 , wherein the processing circuitry is configured to perform a pulse sequence of a spin echo or a field echo.
4 . The magnetic resonance imaging apparatus according to claim 2 , wherein the processing circuitry is configured to collect the plurality of magnetic resonance signals while widening a collection band width of the magnetic resonance signals to N times as compared with a case where collection of the plurality of magnetic resonance signals is performed once, by shifting the acquisition windows by 1/N of the sampling interval, where N is a natural number.
5 . The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is configured to perform a pulse sequence for generating a spin echo and to collect the plurality of magnetic resonance signals while changing the relative relationship by shifting an application timing of a refocusing pulse in the pulse sequence by a width smaller than a sampling interval.
6 . The magnetic resonance imaging apparatus according to claim 5 , wherein the processing circuitry is configured to widen a collection band width of the magnetic resonance signals to N times as compared with a case where collection of the magnetic resonance signals is performed once, by collecting the plurality of magnetic resonance signals while shifting the application timing of the refocusing pulse by 1/N of the sampling interval, where N is a natural number.
7 . The magnetic resonance imaging apparatus according to claim 5 , wherein the processing circuitry is configured to collect the plurality of magnetic resonance signals while changing the relative relationship by further shifting the acquisition windows by a width smaller than the sampling interval.
8 . The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is configured to collect the plurality of magnetic resonance signals while changing the relative relationship by shifting an application timing of a readout gradient magnetic field by a width smaller than a sampling interval.
9 . The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is configured to perform a pulse sequence having multiple echoes.
10 . The magnetic resonance imaging apparatus according to claim 9 , wherein the processing circuitry is configured to collect the plurality of magnetic resonance signals while changing the relative relationship for each echo constituting the multiple echoes
11 . A magnetic resonance imaging method, comprising:
collecting a plurality of magnetic resonance signals while changing relative relationship between echoes and acquisition windows; and
generating a magnetic resonance image based on data obtained by combining the plurality of magnetic resonance signals.