Reinsberg Stefan A, Doran Simon J, Charles-Edwards Elizabeth M, Leach Martin O
Cancer Research UK Clinical MR Research Group, Royal Marsden NHS Trust/Institute of Cancer Research, Downs Rd, Sutton SM2 5PT, UK.
Phys Med Biol. 2005 Jun 7;50(11):2651-61. doi: 10.1088/0031-9155/50/11/014. Epub 2005 May 18.
Radiotherapy treatment planning relies on the use of geometrically correct images. This paper presents a fully automatic tool for correcting MR images for the effects of B(0) inhomogeneities. The post-processing method is based on the gradient-reversal technique of Chang and Fitzpatrick (1992 IEEE Trans. Med. Imaging 11 319-29) which combines two identical images acquired with a forward- and a reversed read gradient. This paper demonstrates how maximization of mutual information for registration of forward and reverse read gradient images allows the elimination of user interaction for the correction. Image quality is preserved to a degree not reported previously.
放射治疗计划依赖于使用几何形状正确的图像。本文提出了一种全自动工具，用于校正由于B(0)不均匀性对磁共振图像产生的影响。后处理方法基于Chang和Fitzpatrick（1992年，《IEEE医学成像汇刊》11卷，319 - 29页）的梯度反转技术，该技术结合了通过正向和反向读取梯度采集的两幅相同图像。本文展示了如何通过最大化正向和反向读取梯度图像配准的互信息来消除校正过程中的用户交互。图像质量得以保留，且保留程度优于之前报道的情况。
