Magnetic resonance imaging apparatus and method
AssigneeKabushiki Kaisha Toshiba
InventorHitoshi Kanazawa
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Abstract
A magnetic resonance imaging apparatus is provided which generates a plurality of echoes by applying a 90.degree. RF pulse for magnetically exciting spins and subsequently repetitively applying a 180.degree. RF pulse for inverting the phase of the magnetized spin. In this apparatus, a pulse sequence is so performed as to enable any specific interval, out of an interval from the application of a 90.degree. RF pulse until a first echo is obtained and intervals each-between sequential adjacent two echoes, to be made to correspond to a 3 or more odd multiple of any other intervals.
Claims51
A magnetic resonance imaging apparatus comprising:
- RF pulse generating means for sequentially generating a plurality of sequential echoes in a sequence by applying a 90.degree. RF pulse for exciting magnetic spins and by sequentially applying a plurality of 180.degree. RF pulses for inverting the phase of the excited magnetic spins;
- and
- means for producing an image based on the echoes,
- said RF pulse generating means generating the 90.degree. and the plurality of the 180.degree. RF pulses at timings such that a plurality of time intervals between the 90.degree. RF pulse and a first echo, and between each adjacent echoes in the sequence, are not all equal, and are each defined as either a shortest time interval thereof or an odd-number multiple of the shortest-time interval thereof.
A magnetic resonance imaging apparatus comprising:
- RF pulse generating means for sequentially generating a plurality of sequential echoes in a sequence by applying a 90.degree. RF pulse for exciting magnetic spins and by sequentially applying a plurality of 180.degree. RF pulses for inverting the phase of the excited magnetic spins;
- and
- means for producing an image based on the echoes,
- said RF pulse generating means sequentially generating the plurality of 180.degree. RF pulses in a sequence separated by a plurality of time intervals that are not all equal, each of the plurality of time intervals being defined as either a shortest-time interval of the plurality of time intervals or an integer multiple of the shortest-time interval thereof.
A magnetic resonance imaging method for exciting magnetic spins and then inverting the phase of the excited magnetic spins to produce a plurality of sequential echoes in a sequence, the method comprising the steps of:
- generating a 90.degree. RF pulse;
- and
- generating a sequence of 180.degree. RF pulses wherein a plurality time intervals between the 90.degree. RF pulse and a first echo, and between each sequentially adjacent echoes, are not all equal, and are each either a shortest time interval thereof or an odd-number multiple of the shortest-time interval thereof.
A magnetic resonance imaging method for exciting magnetic spins and then inverting the phase of the excited magnetic spins to produce a plurality of sequential echoes, the method comprising the steps of:
- generating a 90.degree. RF pulse;
- and
- generating a sequence of 180.degree. RF pulses separated by a plurality of time intervals such that each of the plurality of time intervals are defined as either one of a shortest-time interval of the plurality of time intervals or an integer multiple of the shortest-time interval thereof.
Dependencies are inferred from the claim text.