Magnetic resonance imaging apparatus
First Claim
1. A magnetic resonance imaging apparatus, comprising:
- a gradient magnetic field application unit that applies two or more gradient magnetic field pulses composed of respective waveforms different from each other, according to respective spatial positions on a single gradient magnetic field application axis in an imaging region,wherein the gradient magnetic field pulses with two or more different waveforms applied by the gradient magnetic field application unit on the single gradient magnetic field application axis are generated based on one predetermined waveform.
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Abstract
In order to obtain highly accurate images with a high SNR without extending measurement time or increasing hardware costs and software processing costs, the present invention narrows a dynamic range (amplitude) of an NMR signal to be received by a reception coil (reception NMR signal) in an MRI apparatus. In order to narrow the amplitude of the reception NMR signal, according to the position of an imaging region, a peak position of the reception NMR signal is shifted from the said position in the present embodiment. The shift is achieved by applying frequency encoding gradient magnetic field pulses whose application amount in the time direction is different according to the position. This is realized by a plurality of gradient magnetic field generating systems that can be driven independently.
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Citations
11 Claims
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1. A magnetic resonance imaging apparatus, comprising:
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a gradient magnetic field application unit that applies two or more gradient magnetic field pulses composed of respective waveforms different from each other, according to respective spatial positions on a single gradient magnetic field application axis in an imaging region, wherein the gradient magnetic field pulses with two or more different waveforms applied by the gradient magnetic field application unit on the single gradient magnetic field application axis are generated based on one predetermined waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification