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Three-point dixon technique for true water/fat decomposition with B0 inhomogeneity correction

✍ Scribed by G. H. Glover; E. Schneider

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
710 KB
Volume
18
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

An enhancement to Dixon's technique is described which can provide error‐free decomposition of water and fat proton images even in the presence of off‐resonance conditions which result from susceptibility differences, demagnetization, or shim errors. The method uses three measurements with phase shifts of 0, π and − π between the fat and water resonances. The additional information provided by the third measurement is used to calculate an image of the field inhomogeneity in addition to true water and fat images. The signal‐to‐noise ratio (SNR) in the decomposed images is equivalent to that of a 2.7 NEX acquisition (instead of 3 NEX), yielding an SNR imaging efficiency of 95%. In addition, the B~0~ image which is provided may have diagnostic value in its own right. Examples of head and body scans often portray surprisingly large B~0~ shifts near interfaces between air or bone and soft tissue. © 1991 Academic Press. Inc.

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