Parker D L, Du Y P, Davis W L
Department of Radiology, University of Utah, Salt Lake City 84132, USA.
Magn Reson Med. 1995 Feb;33(2):156-62. doi: 10.1002/mrm.1910330203.
In this paper the problem of small structure visualization in magnetic resonance imaging (MRI) is considered. The relationship between the structure and the image intensities is defined in terms of the voxel sensitivity function (VSF). Using the VSF, the spatial dependence of the voxel signal for small spheres and cylinders is computed. Although the spatial fluctuation is smaller in the MRI VSF than that which would be obtained from a uniformly sensitive cubical voxel, the deviation still results in significant signal loss near the edges and corners of the voxels. Finally, the VSF formalism is used to demonstrate the improvement in signal uniformity that can be obtained by using zero-filled (band-limited or sinc) interpolation.
本文考虑了磁共振成像（MRI）中微小结构可视化的问题。结构与图像强度之间的关系是根据体素灵敏度函数（VSF）来定义的。利用VSF，计算了小球体和小圆柱体体素信号的空间依赖性。尽管MRI的VSF中的空间波动比从均匀敏感的立方体体素中获得的要小，但这种偏差仍然会在体素的边缘和角落附近导致显著的信号损失。最后，VSF形式被用于证明通过使用零填充（带限或sinc）插值可以获得信号均匀性的改善。
