MRI apparatus generating deformed binomial pulse waveforms based on flip angle
First Claim
Patent Images
1. An MRI apparatus comprising:
- a waveform setting unit configured to set an asymmetric binomial RF pulse waveform sequence including at least three RF pulses which are asymmetrically positioned with respect to an excitation center so as to impose unequal nuclear magnetic resonant (NMR) flip angles prior to and subsequent to said excitation center thus facilitating reduced length of the excitation binomial RF pulse waveform sequence and reduced imaging time;
an applying control unit configured to control application to a subject of said RF pulses in accordance with the set asymmetric binomial RF pulse waveform sequence;
a reconstructing unit configured to reconstruct an image based on MRI RF signals received in response to the applied asymmetric RF pulse waveform sequence; and
a display control unit configured to control a display of the reconstructed image.
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Abstract
An MRI apparatus has a waveform setting unit, an applying control unit, a reconstructing unit, and a display control unit. The waveform setting unit sets an asymmetric RF pulse Waveform. The applying control unit controls an application of a pulse in accordance with the RF pulse waveform. The reconstructing unit reconstructs an image based on a signal received by the application. The display control unit controls a display of the image.
24 Citations
13 Claims
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1. An MRI apparatus comprising:
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a waveform setting unit configured to set an asymmetric binomial RF pulse waveform sequence including at least three RF pulses which are asymmetrically positioned with respect to an excitation center so as to impose unequal nuclear magnetic resonant (NMR) flip angles prior to and subsequent to said excitation center thus facilitating reduced length of the excitation binomial RF pulse waveform sequence and reduced imaging time; an applying control unit configured to control application to a subject of said RF pulses in accordance with the set asymmetric binomial RF pulse waveform sequence; a reconstructing unit configured to reconstruct an image based on MRI RF signals received in response to the applied asymmetric RF pulse waveform sequence; and a display control unit configured to control a display of the reconstructed image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An MRI apparatus configured for generating an MRI image using a binomial RF pulse waveform sequence in order to excite a species of nuclide, said apparatus comprising:
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a waveform setting unit configured to generate and set a deformed binomial RF pulse waveform sequence having at least three RF pulses by deleting a portion of a binomial RF pulse waveform sequence and by also adding a flip angle amount calculated based on the deleted portion to the remaining waveforms of the sequence which has RF pulses that are asymmetrically positioned with respect to an excitation center so as to impose unequal nuclear magnetic resonant (NMR) flip angles prior to and subsequent to said excitation center thus facilitating a reduced length of the excitation binomial RF pulse waveform sequence and reduced imaging time; and an applying control unit configured to control application to a subject of the deformed binomial RF pulse waveform sequence set by the waveform setting unit.
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12. An MRI apparatus configured for generating an MRI image using a binomial RF pulse waveform sequence in order to excite a species of nuclide, said apparatus comprising:
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a waveform setting unit configured to generate and set a deformed binomial RF pulse waveform sequence by sharing an intensity or a flip angle value, used for at least one RF pulse of a non-deformed binomial RF pulse waveform sequence with the RF pulses, of the deformed binomial RF pulse waveform sequence, having RF pulses which are asymmetrically positioned with respect to an excitation center so as to impose unequal nuclear magnetic resonant (NMR) flip angles prior to and subsequent to said excitation center thus facilitating a reduced length of the excitation binomial RF pulse waveform sequence and a reduced imaging time; and an applying control unit configured to control an application to a subject of the deformed binomial RF pulse waveform sequence set by the waveform setting unit.
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13. A method for generating an MRI image using a binomial RF pulse waveform sequence, said method comprising:
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a waveform setting unit configured to generate and set a deformed binomial RF pulse waveform sequence by adding an intensity or a flip angle value used for at least one RF pulse of a non-deformed binomial RF pulse waveform sequence to remaining RF pulses of the deformed binomial RF pulse waveform sequence, with the deformed binomial RF pulse waveform sequence having RF pulses which are asymmetrically positioned with respect to an excitation center so as to impose unequal nuclear magnetic resonant (NMR) flip angles prior to and subsequent to said excitation center thus facilitating a reduced length of the excitation binomial RF pulse waveform sequence and a reduced imaging time; and an applying control unit configured to control an application to a subject of the deformed binomial RF pulse waveform sequence set by the waveform setting unit.
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Specification