A COMPUTER ALGORITHM FOR THE SIMULATION OF ANY NMR IMAGING METHOD
A COMPUTER ALGORITHM FOR THE SIMULATION OF ANY NMR IMAGING METHOD
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DOI：
10.1016/0730-725x(84)90065-1
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发表时间：
1984-01-01
影响因子：
2.5
通讯作者：
SAUZADE M
中科院分区：
文献类型：
--
作者：
BITTOUN J;TAQUIN J;SAUZADE M
介绍了利用不同的射频脉冲序列、磁场梯度变化和数据处理的十几种核磁共振成像方法。为了在最一般的情况下有一个理论上的理解，一个计算机程序的NMR成像技术的模拟开发。该算法在模拟对象的每个点处使用Bloch方程的解。在每个时刻计算每个基本磁矩的方向，并存储在一个数组中，给出要处理的全局信号，无论脉冲和梯度序列如何。为了验证该程序的有效性，对一些著名的实验结果进行了模拟。一些应用程序，这有助于理解图像失真和技术，如选择性的射频脉冲或振荡梯度。该程序可用于揭示图像失真的物理和技术原因，对实验的任何参数进行微观观察，并研究由各种NMR成像技术给出的对比度作为3个NMR参数的函数，即，氢核密度ρ。以及弛豫时间T1和T2。
More than a dozen NMR imaging methods are described using different radio-frequency pulse sequences, magnetic field gradient variations and data processing. In order to have a theoretical understanding in the most general case, a computer program for the simulation of NMR imaging techniques was developed. The algorithm uses the solution of the Bloch equations at each point of a simulated object. The direction of every elementary magnetic moment is computed at each instant, and stored in an array giving the global signal to be processed, whatever the pulse and gradient sequence. To test the validity of this program, some well-known experimental results were simulated. Some applications are presented which contribute to the understanding of image distortions and to techniques such as selective radio-frequency pulse or oscillating gradients. This program can be used to unravel physical and technological causes of image distortions, to have a microscopic look at any parameter of an experiment, and to study the contrast given by various NMR imaging techniques as a function of the 3 NMR parameters, i.e., the hydrogen nuclei density .rho. and the relaxation times T1 and T2.