Mitsouras Dimitris, Zientara Gary P, Edelman Alan, Rybicki Frank J
Department of Radiology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA.
Magn Reson Imaging. 2006 Nov;24(9):1209-27. doi: 10.1016/j.mri.2006.07.003. Epub 2006 Sep 20.
Current efficient magnetic resonance imaging (MRI) methods such as parallel-imaging and k-t methods encode MR signals using a set of effective encoding functions other than the Fourier basis. This work revisits the proposition of directly manipulating the set of effective encoding functions at the radiofrequency excitation step in order to increase MRI efficiency. This approach, often termed "broadband encoding," enables the application of algebraic matrix factorization technologies to extract efficiency by representing and encoding MR signal content in a compacted form. Broadband imaging equivalents of fast multiecho, parallel and k-t MRI are developed and analyzed. The potential of these techniques to increase the time efficiency of data acquisition is experimentally verified on a commercial MRI scanner using simple spin-echo imaging. A three-dimensional gradient-echo dynamic imaging application that demonstrates the potential benefits of this approach compared to the present state of the art for certain applications is also presented.
当前高效的磁共振成像（MRI）方法，如并行成像和k-t方法，使用一组不同于傅里叶基的有效编码函数来编码MR信号。这项工作重新审视了在射频激发步骤直接操纵有效编码函数集以提高MRI效率的提议。这种方法通常被称为“宽带编码”，它能够应用代数矩阵分解技术，通过以紧凑形式表示和编码MR信号内容来提高效率。开发并分析了快速多回波、并行和k-t MRI的宽带成像等效方法。这些技术提高数据采集时间效率的潜力在商用MRI扫描仪上通过简单的自旋回波成像进行了实验验证。还展示了一个三维梯度回波动态成像应用，该应用表明了与当前技术水平相比，这种方法在某些应用中具有潜在优势。
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