Design of practical T2-selective RF excitation (TELEX) pulses
Design of practical T2-selective RF excitation (TELEX) pulses
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DOI：
10.1002/mrm.1910400615
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发表时间：
1998-12-01
影响因子：
3.3
通讯作者：
Wright, GA
中科院分区：
文献类型：
--
作者：
Sussman, MS;Pauly, JM;Wright, GA
传统的基于T-2的成像技术是针对长T-2物种的成像。因此，在感兴趣的信息存在于短T-2物种的临床情况下，传统技术并不是最佳的。T-2选择性射频激励(TELEX)是一种获得基于T-2的对比度的技术，它突出显示短T-2值，同时抑制长T-2值-与传统的T-2对比度相反。此前，电传已被定性地证明只突出非常短的T-2值(T-2接近于0.001 S)。当应用于较长的T-2值(T-2大于或等于0.01 S)时，电传对增量B-0不均匀变得敏感。这将它的应用限制在感兴趣的T-2非常短的问题上。在这项研究中，电传的特征是定量的。此外，还开发了一种带宽展宽方案，它降低了电传的增量B-0灵敏度，这使得该技术可以应用于较长的T-2值。讨论了实际实现电传的能力和局限性。
Traditional T-2-based imaging techniques are geared toward imaging long-T-2 species. Traditional techniques are, therefore, not optimal in clinical situations where the information of interest lies in the short-T-2 species. T-2-selective RF excitation (TELEX) is a technique for obtaining a T-2-based contrast that highlights short-T-2 values while suppressing long-T-2 values-opposite to traditional T-2 contrast. Previously, TELEX has been demonstrated qualitatively to highlight only very short-T-2 values (T-2 approximate to 0.001 s). When applied to longer T-2 values (T-2 greater than or equal to 0.01 s), TELEX becomes sensitive to Delta B-0 non-uniformities. This restricts its application to problems in which the T-2 of interest is very short. In this study, TELEX is characterized quantitatively. Furthermore, a bandwidth broadening scheme is developed that reduces the Delta B-0 sensitivity of TELEX This permits the technique to be applied to longer T-2 values. The capabilities and limitations of a practical implementation of TELEX are discussed.