功能磁共振图像重切片中的插值效果分析。
Analysis of interpolation effects in the reslicing of functional MR images.
作者信息
Ostuni J L, Santha A K, Mattay V S, Weinberger D R, Levin R L, Frank J A
机构信息
Laboratory of Diagnostic Radiology Research, National Institutes of Health, Bethesda, MD 20892-1074, USA.
出版信息
J Comput Assist Tomogr. 1997 Sep-Oct;21(5):803-10. doi: 10.1097/00004728-199709000-00029.
PURPOSE
Typically, the final step in volume registration is the reslicing of the volume of interest. The purpose of this work is to examine the effects of this reslicing on functional MRI (fMRI) data using different interpolation methods.
METHOD
Functional whole-brain echo planar imaging (EPI) volumes were resliced using six different interpolation methods: trilinear, tricubic splines, and a 3D sinc function using a rectangular and a Hanning window, both with half-window lengths of 3 and 4 voxels.
RESULTS
Interpolation by tricubic spline and 3D sinc using a Hanning window had comparable errors, although tricubic spline interpolation was computationally the fastest. Interpolation by trilinear and 3D sinc using a rectangular window had relatively large errors, although the speed of trilinear makes it desirable for some applications.
CONCLUSION
Interpolations using all of the tested methods adversely affected the fMRI data, although these effects differed for each method.
目的
通常，容积配准的最后一步是对感兴趣容积进行重切片。本研究的目的是使用不同的插值方法来研究这种重切片对功能磁共振成像（fMRI）数据的影响。
方法
使用六种不同的插值方法对全脑功能回波平面成像（EPI）容积进行重切片：三线性插值、三次样条插值以及使用矩形窗和汉宁窗的3D sinc函数插值，两种窗的半窗长度均为3和4体素。
结果
使用汉宁窗的三次样条插值和3D sinc插值具有相当的误差，尽管三次样条插值在计算上是最快的。使用矩形窗的三线性插值和3D sinc插值具有相对较大的误差，尽管三线性插值的速度使其在某些应用中具有优势。
结论
尽管每种方法的影响不同，但使用所有测试方法进行插值都会对fMRI数据产生不利影响。
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