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US 5,672,970 AGranted
Magnetic-resonance imaging apparatus
AssigneeKabushiki Kaisha Toshiba
InventorHiroshi Takai
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Abstract
A magnetic-resonance imaging apparatus of the present invention performs a field echo sequence and high-speed spin echo sequence with an excitation pulse shared by them and, by so doing, it is possible to, in comparison with the high-speed spin echo sequence only, reduce a repetition time and hence an imaging time.
Claims10
A magnetic-resonance imaging apparatus comprising:
- first generating means for generating an excitation pulse;
- second generating means for periodically generating a plurality of inversion pulses after the excitation pulse;
- third generating means for generating a gradient magnetic field whose polarity alternates in each of some of intervals between pairs of inversion pulses;
- first detecting means for detecting a plurality of echoes in each of the some of intervals;
- second detecting means for detecting an echo in each of the others of the intervals;
- and
- means for reconstructing a first image and a second image based on the detected echoes.
4 more elements
A method of operating a magnetic resonance imaging apparatus, comprising:
- performing the following steps in a single sequence:
- a) applying an excitation pulse;
- b) applying a plurality of inverting pulses after said excitation pulse, each inverting pulse applied in an interval of time;
- c) detecting a first plurality of first echo signals from a first plurality of intervals of time, with a second plurality of first echo signals, less than said first plurality of first echo signals, detected within one of said first plurality of intervals of time;
- d) detecting a plurality of second echo signals from a second plurality of intervals of time, with a second echo signal detected in each of said second plurality of intervals of time;
- and
- e) reconstructing a first and a second image based upon said first plurality of first echo signals and said first plurality of second echo signals.
4 more elements
Dependencies are inferred from the claim text.