Imaging_10 - Imaging "for their discoveries...

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Unformatted text preview: Imaging "for their discoveries concerning magnetic resonance imaging" Paul C. Lauterbur Sir Peter Mansfield The Nobel Prize in Physiology or Medicine 2003 Imaging System: 7T-160 mm Magnets are often horizontal bore Coils built to order RF coils are quite varied Transmit coils and gradient coils are often fixed in the bore much like a high resolution system Observe coils may be localized on animal like these surface coils From Doty Scientific Human MRI 3T: 60cm UGA 3 Tesla magnet Surface or volume coil Imaging System (From Joy Hirsh, Columbia University) Simple Imaging Strategy During gradient spins in each volume element have their own precession frequency Can get a 1D image of sample used in gradient shimming High positive frequency Zero frequency High negative frequency Z Simple 2D Image For 2D imaging use gradients in different directions (x, z) in different evolution periods (t1, t2) 90x Gz Gx t1 t2 z x 1 2 Echo Planar Imaging Speeding up Acquisitions 90x Gz t2 t2 t2 t2 t2 t1 dw-1 dw-2 dw-3 dw-4...
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Imaging_10 - Imaging "for their discoveries...

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