Excitation and geometrically matched local encoding of curved slices.
Excitation and geometrically matched local encoding of curved slices.
复制标题
弯曲切片的激励和几何匹配的局部编码。
DOI：
10.1002/mrm.24364
复制
发表时间：
2013
影响因子：
3.3
通讯作者：
Zaitsev,Maxim
中科院分区：
文献类型：
--
作者：
Weber,Hans;Gallichan,Daniel;Schultz,Gerrit;Cocosco,ChrisA;Littin,Sebastian;Reichardt,Wilfried;Welz,Anna;Witschey,Walter;Hennig,Jürgen;Zaitsev,Maxim
In this work, the concept of excitation and geometrically matched local in‐plane encoding of curved slices (ExLoc) is introduced. ExLoc is based on a set of locally near‐orthogonal spatial encoding magnetic fields, thus maintaining a local rectangular shape of the individual voxels and avoiding potential problems arising due to highly irregular voxel shapes. Unlike existing methods for exciting curved slices based on multidimensional radiofrequency‐pulses, excitation and geometrically matched local encoding of curved slices does not require long duration or computationally expensive radiofrequency‐pulses. As each encoding field consists of a superposition of potentially arbitrary (spatially linear or nonlinear) magnetic field components, the resulting field shape can be adapted with high flexibility to the specific region of interest. For extended nonplanar structures, this results in improved relevant volume coverage for fewer excited slices and thus increased efficiency. In addition to the mathematical description for the generation of dedicated encoding fields and data reconstruction, a verification of the ExLoc concept in phantom experiments and examples for in vivo curved single and multislice imaging are presented. Magn Reson Med, 2013. © 2012 Wiley Periodicals, Inc.
