Nuclear Magnetic Resonance Imaging: Basic Principles
نویسندگان
چکیده
منابع مشابه
Basic principles of magnetic resonance imaging.
We have come full circle from spinning quarks to 3D medical images. The bulk of MRI is now performed using slice-selective gradients, during which RF energy is applied to excite the hydrogen nuclei. By stepping a phase-encoding gradient during each TR and using a frequency-encoding gradient as the data are sampled, the 3D human object can be reduced to many individual points or voxels. By acqui...
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3 A MR Experiment 3 3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2 Can we scan the subject? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.3 The subject goes into the magnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.3.1 Equilibrium magnetization M0 . . . . . . . . . ....
متن کاملNuclear Magnetic Resonance Imaging
Hydrogen is present (IbundanLly in biological tis~uc. Protons posse~s two fundamental physical properlie~, (i) spin (L) LInd (ii) a small magnetic movement ( 11). Therefore the ,Homic nuclei or hydrogcn behave like tiny spi nn ing magnets. Our eart h is al~o (l n examplt: of such a magnet ic spinning top. When they a re placed in a sIalic magnetic Ilcld (Fig. I), the nudcl align themselves para...
متن کاملNuclear magnetic resonance imaging
This review covers the progress in the field of NMR imaging (NMRI), NMR microimaging, NMR microscopy or MR (micro) tomography as well as MRI (Magnetic Resonance Imaging) over a period from June 2005 to may 2006 and is a continuation of the report from last year. The word ‘‘MRI’’ was used mostly in the medical or clinical field, but recently many authors in non-medical field uses ‘‘MRI’’ instead...
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ژورنال
عنوان ژورنال: Journal of Neurology, Neurosurgery & Psychiatry
سال: 1984
ISSN: 0022-3050
DOI: 10.1136/jnnp.47.11.1263