Bobek-Billewicz B, Dziewiatkowski J
Department of Radiology, Medical University, ul. Debinki 7, 80-211 Gdańsk, Poland.
Folia Morphol (Warsz). 2001;60(1):69-72.
The purpose of the study was to evaluate the usefulness of magnetic resonance (MR) in imaging of the cisternal and petroclival segments of the abducent nerve. Heavily T2-weighted submillimetric 3D sequence in axial plane, T1-weighted 3D, 1.5 mm slice thickness sequence in axial plane and TOF sequence were performed on 16 volunteers. Additionally the reformatted T2-weighted images in sagittal and in oblique parasagittal plane parallel to the abducent nerve in the pontine cistern were performed. The heavily T2-weighted sequence provides high contrast between fluid and other structures. High signal intensity of the cerebrospinal fluid is a kind of background for cranial nerves, vessels, meninges as well as for bony and fibrous structures. The authors identified the abducent nerve in at least one plane of the submillimetric, heavily T2-weighted sequences in 84.4% cases (in 84.4% in axial plane, 68.8% in sagittal and 84.4% parasagittal parallel to the VI-th cranial nerve in the pontine cistern). Dorello's canal was identified in 27/32 abducent nerves (84.4%) on the submillimetric, heavily T2-weighted sequence in parasagittal parallel to the abducent nerve in the pontine cistern plane. In 71.9% (23/32) of cases, the abducent nerve was in contact with the arterial vessel in pontine cistern.
本研究的目的是评估磁共振成像（MR）在展神经脑池段和岩斜段成像中的应用价值。对16名志愿者进行了轴位平面的重T2加权亚毫米3D序列、轴位平面的T1加权3D序列（层厚1.5mm）和TOF序列检查。此外，还进行了矢状面和与脑桥池内展神经平行的斜矢状面的T2加权图像重建。重T2加权序列在液体与其他结构之间提供了高对比度。脑脊液的高信号强度是脑神经、血管、脑膜以及骨和纤维结构的一种背景。作者在84.4%的病例中，在亚毫米重T2加权序列的至少一个平面上识别出展神经（在轴位平面为84.4%，矢状面为68.8%，与脑桥池内第六脑神经平行的斜矢状面为84.4%）。在与脑桥池平面内展神经平行的斜矢状面的亚毫米重T2加权序列上，在32条展神经中的27条（84.4%）中识别出了Dorello管。在71.9%（23/32）的病例中，展神经与脑桥池内的动脉血管相接触。
