A Velocity <i>k</i>‐Space Analysis of Flow Effects in Echo‐Planar and Spiral Imaging

DOI Web Site Web Site 被引用文献3件

書誌事項

公開日
1995-04
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/mrm.1910330414
公開者
Wiley

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<jats:title>Abstract</jats:title><jats:p>A velocity <jats:italic>k</jats:italic>‐space formalism facilitates the analysis of flow effects for imaging sequences involving time‐varying gradients such as echo‐planar and spiral. For each sequence, the velocity <jats:italic>k</jats:italic>‐space trajectory can be represented by k<jats:sub>v</jats:sub> (k)<jats:sub>r</jats:sub>; that is, its velocity‐frequency (k<jats:sub>r</jats:sub>) position as a function of spatial‐frequency (k<jats:sub>r</jats:sub>) position. In an echo‐planar sequence, k<jats:sub>r</jats:sub> is discontinuous and asymmetric. However, in a spiral sequence, k<jats:sub>r</jats:sub> is smoothly varying, circularly symmetric, and small near the k<jats:sub>r</jats:sub> origin. To compare the effects of these trajectory differences, simulated images were generated by computing the <jats:italic>k</jats:italic>‐space values for an in‐plane vessel with parabolic flow. Whereas the resulting echo‐planar images demonstrate distortions and ghosting that depend on the vessel orientation, the spiral images exhibit minimal artifacts.</jats:p>

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