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外文全文版本 不是网上流传的3章。非翻译本

随着三维CT(Three Dimensional Computed Tomography，简称3D-CT)在医学和工业上的应用越来越广泛，三维CT图像重建算法已成为倍受关注的研究热点。 在各种重建算法中，近似重建算法在实际中应用较广泛，其中基于滤波反投影的FDK(Feldkamp-Davis-Kress)近似算法是实际应用中的主流算法。FDK算法具有数学推导简单，易于实现，重建速度快，且在锥角较小时能够取得较好的重建效果等优点。本文所作研究均基于FDK算法进行展开。 在3D-CT技术的实际应用中还存在很多问题，其中运算速度较慢和扫描动态范围较小均是阻碍其发展的瓶颈问题。本论文的主要工作就是针对这两个问题进行研究。 本文的第一部分分析了重建像素坐标的相关性和投影地址的相关性，并利用这些相关性采用基于投影驱动的方法进行图像重建，使重建速度大大提高。当重建图像大小为256×256×256时，重建速度比未经简化的原始算法快约20倍。同时还提出了基于投影驱动法重建时如何进行图像的分块重建及存储。

书名:掌握和精通Maple 作者:马春庭…[等]编著 ISBN号:7-111-02045-6 价格:CNY32.00 出版地:北京 出版社:机械工业出版社 出版时间:2000 页数:300页 开本:26cm

Mathematica is a fairly specialized software for working with a broad range of mathematical equations and graphs. The book is a description of how to use the software. Stephen Wolfram wrote the software, so the book is pretty authoritative. I find the book and the software to be amazing, fantastic, phenomenal, ground-breaking, and all the other adjectives like those. I'd also throw in artistic, poetic, and stunningly beautiful. The software does not come with the book - it's sold separately.... There is a student version available for significantly less.... The student version is the same as the professional version, but you have to upgrade to the professional version after you graduate (but you get a discount on the upgrade also). There is an electronic copy of the book that is included with the software, but I find it handy to also have the hard copy book. I also found the software support people to be outstanding