Imaging of the active B-1 field in vivo
Imaging of the active B-1 field in vivo
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DOI：
10.1002/mrm.1910350217
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发表时间：
1996-02-01
影响因子：
3.3
通讯作者：
Wach, P
中科院分区：
文献类型：
--
作者：
Stollberger, R;Wach, P
本文在已有方法的基础上，利用不同激发角度下测得的两幅图像的信号强度比，重复时间TR≥5t -1，提出了一种B-1场有效成分体内多层成像的精确方法。通过模拟和测量验证了该脉冲对T-1效应的抑制作用，进一步研究了多层成像中切片选择激励和磁化转移对B-1场测定的影响，通过几个模拟和体内测量证明了该方法的稳定性和准确性。利用所述方法可以在不到6 min的时间内确定23个横截面的体内活性B-1场。
The authors describe a method for accurate in vivo multislice imaging of the active component of the B-1 field which is based on a previously proposed method, which uses the signal intensity ratio of two images measured with different excitation angles, and a repetition time TR greater than or equal to 5 T-1. The new method essentially reduces repetition and scan time by means of an additional compensating pulse, The suppression of T-1 effects by this pulse are verified with simulations and measurements, Further investigations concerned the influence of slice selective excitation and magnetization transfer in multislice imaging to the B-1 field determination, The stability and accuracy of the presented method is shown by several phantom and in vivo measurements, With the described method the active B-1 field can be determined in vivo in 23 cross-sections in less than 6 min.