By Franz Schmitt, Michael K. Stehling, Robert Turner, P. Mansfield
This ebook describes functions and strategies of the MRI approach to echo-planar imaging. I comprises particular and designated bills of picture construction, artifacts, and optimization tools. functions are imaging of mind functionality, stroke and cerebral blood circulation in addition to cardiac and belly scientific uses.
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Extra info for Echo-Planar Imaging: Theory, Technique and Application
Howseman AM, Stehling MK, Chapman B, Coxon R, Turner R et al (1988) Improvements in snap-shot nuclear magnetic resonance imaging. Br J Radiol 61(729):822-888 6. Pykett I, Rzedzian R (1987) Instant images of the body by magnetic resonance. Magn Reson Med 5:563-571 7. Hennig J, Nauerth A, Friedburg H (1986) RARE imaging: a fast method for clinical MR. Magn Reson Med 3:823-833 8. Oshio K, Feinberg DA (1991) GRASE (gradient- and spin-echo) imaging: a novel fast MRI technique. Magn Reson Med 20(2):344-349 9.
Many strategies for increased conventional imaging speed, such as "fast spin-echo " and "keyhole imaging " take advantage of this in controlling image contrast that the points near the center of k space form a low-resolution map of the signal, and points near the periphery encode the image details . A few added notes about k space (stated without proof): • The spacing between points in k space determines the image field of view (FOY). The smaller the k displacement between adjacent points the wider the FOY.
6 Mbyte per second (assuming 16-bit digitisation of the MR signal). Clearly the high speed of EPI can therefore pose some data archiving problems, and efficient implementation of the technique requires the use of computing systems with large data storage areas which can be accessed at. high speed. The need to acquire a train of echoes generally means that the MR signal is sampled longer in EPI than in other techniques. The long duration of the sampling window, NT, translates into a low-frequency separation between pixels in the direction of the blipped gradient in the resulting image.