Placidi Giuseppe, Alecci Marcello, Sotgiu Antonello
INFM, c/o Centro Interdipartimentale di Risonanza Magnetica and Dipartimento S. T.B., Universitai dell'Aquila, Via Vetoio 10, 67010 Coppito, L'Aquila, Italy.
Stud Health Technol Inform. 2002;90:13-7.
An innovative algorithm for Magnetic Resonance Imaging (MRI) capable of demonstrating the source of various artefacts and driving the hardware and software acquisition process is presented. The algorithm is based on the application of the Bloch equations to the magnetization vector of each point of the simulated object, as requested by the instructions of the MRI pulse sequence. The collected raw data are then used to reconstruct the image of the object. The general structure of the algorithm makes it possible to simulate a great range of imaging situations in order to explain the nature of unwanted artefacts and to study new acquisition techniques. The way the algorithm structures the sequence has also allowed the easy implementation of MRI data acquisition on a commercial general-purpose DSP-based data acquisition board, thus facilitating the comparison between simulated and experimental results.
本文提出了一种用于磁共振成像（MRI）的创新算法，该算法能够展示各种伪影的来源，并驱动硬件和软件采集过程。该算法基于根据MRI脉冲序列的指令，将布洛赫方程应用于模拟对象每个点的磁化矢量。然后，收集到的原始数据用于重建对象的图像。该算法的总体结构使得可以模拟大量的成像情况，以解释不需要的伪影的性质，并研究新的采集技术。该算法构建序列的方式还使得能够在基于商业通用DSP的数据采集板上轻松实现MRI数据采集，从而便于比较模拟结果和实验结果。
