Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan.
J Magn Reson. 2010 Apr;203(2):247-52. doi: 10.1016/j.jmr.2010.01.002. Epub 2010 Jan 11.
The method of slice selection proposed for solid-state MRI by combining DANTE selective excitation with magic echo (ME) line narrowing requires a rephasing period ca. 0.6 times the DANTE excitation period. The added rephasing period results in a significant loss of sensitivity due to transverse relaxation. To solve the sensitivity problem, we make use of the self-refocusing effect of the 270 degrees Gaussian-shaped soft pulse by introducing a 270 degrees flipping Gaussian modulation to the ME DANTE method. This eliminates the rephasing period. The utility of the improved method is demonstrated by experiments performed on test samples of adamantane and polycarbonate.
该方法的切片选择提出的固态磁共振成像相结合的 DANTE 选择性激励与魔术回波 (ME) 线窄需要一个重聚期 ca.0.6 倍的 DANTE 激励周期。添加重聚期导致灵敏度显著下降由于横向弛豫。为了解决灵敏度问题，我们利用自聚焦效应的 270 度高斯形软脉冲通过引入 270 度翻转高斯调制到 ME DANTE 方法。这消除了重聚期。该改进方法的实用性通过实验证明进行测试样品的金刚烷和聚碳酸酯。
