| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic resonance imaging (MRI) apparatus which detects positions of cells labelled with magnetic microparticles at a high speed with a high degree of accuracy. SOLUTION: An irradiation coil is controlled to repeat polarity reversal of a plurality of high frequency magnetic field sub-pulses dispersed on a time axis as excitation RF pulses and to generate amplitude-modulated burst RF pulses which are amplitude-modulated by a function to vary an amplitude every polarity reversal. The irradiation coil is controlled to set a time interval of the amplitude-modulated burst RF pulses to 1/(2×a first frequency) substantially and to set a carrier wave frequency of the amplitude-modulated burst RF pulses to a second frequency which is shifted from a magnetic resonance frequency of a hydrogen nucleus in the magnetic field intensity of the MRI apparatus substantially by the first frequency. A first frequency is determined from magnetic microparticle information read out of a magnetic microparticle information housing part and the magnetic resonance frequency of the hydrogen nucleus in a static magnetic field. Consequently, the positions of the cells labelled with the magnetic microparticles are detected by the MRI apparatus at a high speed with a high degree of accuracy. COPYRIGHT: (C)2008,JPO&INPIT
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