Nuclear magnetic resonance imaging of the orbit.
Nuclear magnetic resonance imaging of the orbit.
复制标题
轨道核磁共振成像。
DOI：
10.1136/bjo.67.6.333
复制
发表时间：
1983
期刊：
影响因子：
--
通讯作者：
Mills,C
中科院分区：
文献类型：
--
作者：
Moseley,I;Brant-Zawadski,M;Mills,C
核磁共振是一种非侵入性成像技术，不使用电离辐射。作者报告了它在正常眼眶成像和组织特征方面的应用。X射线计算机断层扫描(CT)在眼眶疾病调查中的应用从根本上改变了对被认为患有球后肿块的患者的诊断方法。以前可用的调查技术要么相对不具信息性(平片、静脉造影)，要么有潜在的危险(眼眶造影术)。超声波的应用也得到了发展，但这项技术有缺点，特别是在眼眶顶端和眼壁的疾病方面。3X光CT在眼眶内也有缺点：它在组织学方面相对不具特异性，这通常是从其他数据推断出来的。他说，安装它的成本很高，而且使用现代扫描仪的复杂研究涉及到对眼睛的大量辐射，这是筛查无法避免的。虽然辐射剂量低于同类技术，但仍然相当可观，4最近的研究表明，经过反复检查，很容易达到导致白内障的剂量。核磁共振成像不使用电离辐射，并且对组织差异非常敏感。目前，拥有必要设备的中心相对较少，但它似乎有可能在几年内成为成像设备的主要部分。本文在简要介绍核磁共振成像原理的基础上，报道了核磁共振轨道成像的初步经验。感兴趣的读者可以获得更完整的核磁共振评论。8
Nuclear magnetic resonance is a noninvasive imaging technique which does not employ ionising radiations. The authors report its application to imaging and tissue characterisation in the normal orbit.The application ofx-ray computed tomography (CT) to the investigation of orbital disease has radically changed the diagnostic approach to patients thought to have retrobulbar masses.'Previously available investigative techniques were either relatively unin-formative (plain films, phlebography) or potentially hazardous (orbitography). 2 Applications of ultrasound have also developed, but the technique has shortcomings, particularly in disease at the apex of the orbit and in its walls. 3 X-ray CT also has shortcomings in the orbit: it is relatively nonspecific as regards histology, which is usually inferred from other data.'It is expensive to install, and sophisticated studieswith modem scanners involve substantial radiation to the eye, which cannot be avoided by screening. The radiation dose, while lower than thatof comparable techniques, is still considerable, 4 and recent studies indicatethat, with repeated examinations a cataractogenic dose is easily reached.'Nuclear magnetic resonance (NMR) imaging uses no ionising radiation and is very sensitive to tissue differences. At present relatively fewcentres have the requisite apparatus, but it seems probable that within a few years it will become a major part of the imaging armamentarium. This paper reports preliminary experience of orbital imaging with NMR after a brief explanation of the principles ofNMR imaging. More complete reviews ofNMR are available for the interested reader. 8