Magnetic resonance imaging apparatus

Details Magnetic resonance imaging apparatus Magnetic resonance imaging apparatus

2011-01-11

2011-01-11

Shrivastav, Brij B (Department: 2831)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

C324S322000

Reexamination Certificate

active

07868618

ABSTRACT:
The MRI apparatus of the present invention executes a non-imaging mode501for obtaining a steady state of magnetization and an imaging mode502for measuring echoes for images. In the non-imaging mode501and the imaging mode502, imaging is performed by using a GrE type pulse sequence. In the imaging, RF pulses are irradiated while flip angle of nuclear magnetization in the imaging mode502is changed in a range of values not larger than a certain value determined by flip angle of nuclear magnetization used in the non-imaging mode502is irradiated. This certain value is, for example, the maximum value of flip angle of nuclear magnetization used in the non-imaging mode, or flip angle provided by an RF pulse used at the end of the non-imaging mode. SAR observed with use of a GrE type pulse sequence can be thereby reduced without degrading image contrast, and thus influence on human bodies can be reduced.

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