Principles and Horizons of Magnetic Resonance Imaging
Magnetic resonance imaging (MRI) is a way of making tomographic images of the body non-invasively. Protons in the body can act like tiny bar magnets, with a north pole and a south pole. When an external magnetic field is applied across a part of the body, each little magnet lines up with the external magnetic field. If a radiofrequency (rf) wave is then transmitted into the tissues, some of the magnets are induced by the energy from the rf wave. The if wave is then turned off, and subsequently the magnets rebroadcast a signal of the same frequency as the original rf wave. A rf coil picks up the signal from the atomic magnets, and a computer can process the signal and reconstruct an image from the signal.
KeywordsNuclear Magnetic Resonance Magnetic Resonance Angiography Flip Angle Spin Echo Magnetic Resonance Imaging Technique
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- Gadian, D.G. and F.N.H. Robinson, 1979, Radiofrequency losses in NMR experiments on electrically conducting samples. J Magn. Reson. 34: 449.Google Scholar
- LeBihan, D. and R Turner, 1992, Diffusion and perfusion. in: Magnetic Resonance Imaging Mosby Year Books, St. LouisGoogle Scholar
- Ljunggren, S., 1983, A simple graphical representation of Fourier-based imaging method. J. Magn. Reson. 54: 338.Google Scholar