CT机和核磁共振成像(MRI)机之间的比较研究

The Comparison Study Between CT & MRI

ＣＴ和ＭＲＩ是当今应用最普遍的两大类临床影像诊断设备。本文应邀就普遍关心的问题，对ＣＴ和ＭＲＩ两大设备在原理、性能、指标、功能、参数、敏感性、安全性、信号性质、图像标准、图像重建的方法学理论等诸多方面进行了有益和有意义的比较。并治两类机器发展的轨迹追溯了两种影像在历史上的交汇点（源宗）。阐明了两套数学方法（Ｒａｄｏｎ变换和 Ｆｏｕｒｉｅｒ变换）的平行发展根源于其信号性质的重大区别。ＭＲ是时域信号，而Ｘ线是空域信号。指出ＰＥＴ、ＳＰＥＣＴ、ＯＣＴ、ＵＣＴ等的图像重建的数学基础与ＣＴ同宗同脉：而ＭＲＩ是独宗。

Both CT and MRI are the most widely used clinical imaging facilities nowadays. This article is invited to give a significant and valuable comparison between CT and MRI in many aspects, such as imaging principles, performances, demand, features, parameters, sensibilities, securities, nature of signals, signals standards, theories of reconstruction methods, etc. It also traces back to the history resemblance of these two methods, and expounds that the sole development of these two mathematical methods (Radon Transform & Fourier Transform) roots in the distinct difference between CT and MR signals. Signal of MR is in time domain and signal of X-ray is in space domain. It is also pointed out that the mathematical foundation of PET, SPECT, OCT, UCT are of the same clan, except the MRI.