Kurtz D, Dwyer A
J Comput Assist Tomogr. 1984 Oct;8(5):819-28. doi: 10.1097/00004728-198410000-00002.
The signal strength of a magnetic resonance (MR) image depends on a variety of factors, including the tissue properties of proton density (p) and relaxation times (T1 and T2) and the scanning sequence. Given this complex interrelation of factors, a graphic method of displaying the image intensity for various tissue properties is needed. In this paper we use isosignal contour curves to display "topographically" the relationships of signal intensity to the tissue properties of p, T1, and T2 for a variety of operator settings in the techniques of saturation recovery, inversion recovery, and spin echo. We further demonstrate the utility of these curves in explaining image appearances and in choosing appropriate pulse sequences for imaging.
磁共振（MR）图像的信号强度取决于多种因素，包括质子密度（p）和弛豫时间（T1和T2）的组织特性以及扫描序列。鉴于这些因素之间复杂的相互关系，需要一种图形方法来显示各种组织特性下的图像强度。在本文中，我们使用等信号轮廓曲线以“地形图”的方式显示在饱和恢复、反转恢复和自旋回波技术中，对于各种操作员设置而言，信号强度与p、T1和T2的组织特性之间的关系。我们进一步证明了这些曲线在解释图像外观以及选择合适的脉冲序列进行成像方面的实用性。
