中文
本网站上的文章翻译自网站Questions and Answers in MRI，仅用于自学磁共振知识中的记录，与任何商业用途无关。
Questions and Answers in MRI是Allen D. Elster博士对磁共振社区的厚重礼物。为了磁共振初学者能够更好地学习磁共振知识，Allen D. Elster博士决定不再更新其出版的Questions and Answers in Magnetic Resonance Imaging，而是拥抱21世纪的新技术，在Questions and Answers in MRI 网站上向磁共振社区完全免费开放其毕生搜集的磁共振物理相关知识的笔记，并且添加了大量多媒体材料。无疑，Allen D. Elster博士对磁共振社区的贡献是巨大的。
本网站上每一篇文章的开头都标出了原始文章的链接，这些文章都是Allen D. Elster博士辛苦劳动的结果，鼓励磁共振爱好者直接阅读这些未经翻译的文章，相信阅读原文的过程中会学到更多。如果觉得文章的知识对您有用，请首先感谢Allen D. Elster博士，正是其无私分享的精神才让我们能够免费地阅读这些珍贵的材料。本网站上的图片非常宝贵，它们的版权都属于Allen D. Elster博士及Questions and Answers in MRI网站，如果要使用原始的文章或者图片，请与Allen D. Elster博士联系取得他的授权，其邮箱为mriquestions@gmail.com。
English
The articles on this site are translation of website Questions and Answers in MRI. These articles are records of learning MRI knowledge by myself and has nothing to do with any commercial purposes.
Website Questions and Answers in MRI is the heavy gift for MRI community from Prof. Allen D. Elster, who has decided not to update and publish his book Questions and Answers in Magnetic Resonance Imaging, but to make all his collection of notes of MRI physics public on Questions and Answers in MRI totally free. Prof. Allen D. Elster has been embracing the new technology in the 21st Centrury and adding many multimedia materials on the site. Undoubtedly, Prof. Allen D. Elster has a giant contribution to the MRI community, especially for the beginners in MRI.
At the beginning of each translated Chinese article, the link of the original English article is marked, which is the result of Prof. Allen D. Elster's hard work. I encourage every MRI enthusiast to read the original articles directly and I believe you can learn more in the process. If you think that you learn something from the articles, please firstly give your appreciation to Prof. Allen D. Elster. It is Prof. Allen D. Elster who selflessly shared the precious materials free of charge. Pictures on this site are very valuable and their copyright belongs to Prof. Allen D. Elster and website Questions and Answers in MRI. If you want to cite his original text or pictures, make sure to contact Prof. Allen D. Elster to get his authorization. His email is mriquestions@gmail.com.