Magnetic resonance properties of hydrogen: imaging the posterior fossa.
Magnetic resonance properties of hydrogen: imaging the posterior fossa.
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氢的磁共振特性：后颅窝成像。
DOI：
10.2214/ajr.137.5.895
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
R. Steiner
中科院分区：
文献类型：
--
作者：
I. Young;M. Burl;G. Clarke;Ashely Hall;T. Pasmore;AG Collins;DT Smith;JS Orr;G. Bydder;FH Doyle;RH Greenspan;R. Steiner
使用由Thorn-EMI有限公司制造的核磁共振（NMR）机对五名健康志愿者进行后颅窝扫描。使用三种不同的NMR扫描序列。在第一，一种类型的饱和恢复技术被用来产生图像强烈依赖于氢核的密度，但与一些依赖于自旋晶格弛豫时间（T1）。在第二，反转恢复技术被用来产生图像的自旋晶格弛豫时间的依赖性更强。在第三，自旋回波技术被用来获得依赖于自旋-自旋弛豫时间（T2）的图像。所有三种类型的NMR图像均不受骨伪影的影响。由于骨的部分体积效应，获得了邻近颅底的脑的可视化，而没有丢失细节。饱和度恢复图像突出显示了在不使用造影剂的情况下清晰可见的动脉和静脉。反转恢复图像显示了显着的灰白质分化，使内部结构可以看到脑干和小脑内。三叉神经和神经节也可见于脑外。自旋回波技术的经验有限，但大脑底部的图像显示了相当多的软组织细节。本研究中后颅窝的核磁共振图像在质量上与新型旋转-旋转X射线计算机断层扫描机获得的图像相当，并且在几个方面具有上级优势。
Posterior fossa scans were performed on five healthy volunteers using a nuclear magnetic resonance (NMR) machine constructed by Thorn-EMI Ltd. Three different NMR scanning sequences were used. In the first, a type of saturation-recovery technique was used to produce images strongly dependent on the density of hydrogen nuclei, but with some dependence on the spin-lattice relaxation time (T1). In the second, an inversion-recovery technique was used to produce images with a stronger dependence on the spin-lattice relaxation time. In the third, a spin-echo technique was used to obtain images with a dependence on the spin-spin relaxation time (T2). All three types of NMR image were unaffected by bone artifact. Visualization of brain adjacent to the skull base was obtained without loss of detail due to partial-volume effect from bone. The saturation-recovery images highlighted arteries and veins that were clearly visible without the use of contrast agents. The inversion-recovery images showed remarkable gray-white matter differentiation enabling internal structure to be seen within the brainstem and cerebellum. The trigeminal nerve and ganglion were also seen outside the brain. Experience with the spin-echo technique is limited, but the images at the base of the brain show considerable soft-tissue detail. The NMR images of the posterior fossa in this study were comparable in quality to those obtained from a new rotate-rotate x-ray computed tomography machine and were superior in several respects.