Julius-Maximilians-Universität Würzburg, Lehrstuhl für Experimentelle Physik 5, Würzburg, Germany.
J Magn Reson. 2010 Jan;202(1):38-42. doi: 10.1016/j.jmr.2009.09.016. Epub 2009 Oct 1.
The diffusion in the magnetic dipolar field around a sphere is considered. The diffusion is restricted to the space between two concentric spheres, where the inner sphere is the source of the magnetic dipolar field. Analytical expressions for the CPMG transverse relaxation rate as well as the free induction decay and the spin echo time evolution are given in the Gaussian approximation. The influence of the inter-echo time is analyzed. The limiting cases of small and large inter-echo times as well as the short and long time behavior are evaluated.
考虑了球体周围磁场偶极子的扩散。扩散仅限于两个同心球体之间的空间，其中内球体是磁场偶极子的源。在高斯近似下，给出了 CPMG 横向弛豫率以及自由感应衰减和自旋回波时间演化的解析表达式。分析了回波时间间隔的影响。评估了小和大回波时间间隔以及短和长时间行为的极限情况。
