| BackgroundOptic canal is the traffic way of the orbital cavity and cranial cavity, its fracture often lead to optic nerve injury, causing symptoms such as loss of vision. Malignant tumour of the orbital cavity etc, can also be spread through optic canal to the cranial cavity, at the same time in the cranial cavity lesions can also be spread through optic canal to the orbital cavity, then through the orbital cavity channel make tumor, inflammation, such as the further spread. Spiral CT is a powerful three-dimensional reconstruction function, such as multiplanar reconstruction technique(MPR) etc, especially the spiral CT showed good ability of bony structure, make the optic canal and the surrounding was able to fully display in CT images, its fine structure can also be displayed more clearly.ObjectiveUsing spiral CT three-dimensional reconstruction techniques, optic canal contrast observation on the fault samples and CT imaging of morphology, length, wall thickness, diameter and area, slope, and the position of the optic canal and sphenoid sinus, ethmoid sinus relations etc, for the spread of optic canal fracture and its surrounding area lesion mutually provide anatomical basis for clinical diagnosis.Materials and methodsSelect the bodies liquid formalin fixed adult head specimens 10 cases,6 cases of male, female 4 cases.In low temperature freezer frozen 5-7 d, respectively by orbital line, before and after the midline and the step is perpendicular to the orbital ear lines for the production of continuous baseline transverse, sagittal and coronal, layer thickness 5 mm.Collection of Puyang city image division, the third people’s hospital between January 2011 to December 2011, during the first facial spiral CT scanning of adults(> 18 age), and the orbital cavity and optic canal lesions in 100 cases, including 60 male patients, female 40 cases, age 19-55. Will be inspectors all the original image data input CT three-dimensional reconstruction of the workstation, using recombinant technology now multiplanar reconstruction(MPR) ADW 4.2 software reconstruction image post-processing software. Observation of optic canal and the surrounding adjacent to the structure, the use of three-dimensional reconstruction workstation software system, measuring the length of the optic canal, wall thickness, diameter and area, slope etc.Results1. Optic canal of the orbit open to the cranial open an inside from the outside to walk on the osseous pipelines, on both sides of the optic canal of orbital distance between mouth 27.60±1.32 mm, cranial mouth distance between 18.22±1.17 mm. On both sides of the optic canal of orbital distance is greater than the distance between the cranial open, there are significant differences between both.2. On CT images, the optic canal on the superior, inferior, medial and lateral wall, the length of the external wall were 10.03±0.56 mm,6.20±0.44 mm,12.03±0.32 mm, 7.90±0.43 mm, the length of the tube wall that there was a significant difference between the inside wall of the longest, shortest under the wall. And there was no significant difference between the corresponding length of fault specimen.3. On CT images, the optic canal on the superior, inferior, medial and lateral wall of the orbital side wall thickness were 1.88±0.87 mm,1.86±0.73 mm,0.87±0.76 mm, 5.02±1.13 mm, the middle wall thickness were 2.15±0.88 mm,1.77±0.65 mm, 0.51±0.40 mm,4.66±1.18 mm, cranial end wall thickness were 0.66±0.47 mm, 2.13±0.51 mm,0.66±0.63 mm,4.57±1.24 mm, outside wall of the orbital end the thickest, inside wall in the middle of the thinnest.4. On CT images, the orbital open of the optic canal, central, cranial around the open diameter were 4.84±0.66 mm,4.64±0.44 mm,6.85±0.54 mm, superior and inferior diameter were 6.12±1.22 mm,4.52±0.76 mm,4.38±0.56 mm, the area was 25.22±4.89 mm2,18.72±3.79 mm2,24.88±4.23 mm2 respectively, around which the optic canal of cranial open of diameter, the largest diameter and the minimum; The area of the optic canal of orbital open biggest, the central area of the smallest.5. On CT images, optic canal with sagittal plane, horizontal plane, coronal plane angle were 38.26±5.20°,19.92±2.02°and 80.96±4.53°, the angle that there was a significant difference between the faults and there was no significant difference between corresponding angle of specimens.6. Optic canal and the relationship between the location of the sphenoid sinus tube type, half pipe type, independent type are 36.5%, 32.5% and 31% respectively, and after a group of ethmoid sinus are 31.5%,33.5% and 35% respectively, there was no significant difference between three types of distribution. Of the optic nerve tube type, half pipe type, pressure type trace optic canal is respectively 4.5%,8% and 6%, optic canal nodules were 5.5%,11% and 3.5%, half pipe type (49.4%) and tube type (25.9%), pressure trace form (24.7%), there are significant differences.Conclusion1. Fault anatomy and CT imaging anatomy and three-dimensional reconstruction technology, objectively and accurately reflects the anatomy of optic canal, is an important means of optic canal and its surrounding structures.2. Optic canal in the middle of the narrow. Optic canal of the inside wall, the longest wall is the most thin. Optic canal wall under the shortest, wall thick. Optic canal is the main part of optic nerve compression in the middle, inside wall and lower wall is open part of the optic canal decompression.3. Optic canal and optic canal nodules of the highest incidence of half pipe type, spiral CT three-dimensional reconstruction can visual neural tube and sphenoid sinus, ethmoid sinus adjacent to make accurate and rational relationship of preoperative assessment... |
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