Optic Canal Fracture CT 3D Reconstruction Research And Clinical Application Value

Optic canal is one of the important channels the orbital with intracranial communication,but also to the optic nerve intracranial stenosis site,because of its diameter is narrow,the position is deep,bone wall is thin,it always is the difficulty in the eye socket imaging examination. Optic canal from cranial cavity forward,outside to orbit tip,located within the supraorbital cracked above,by sphenoid small winglets constitute,through the sphenoid small winglets,between the two roots. Optic canal can be divided up,down,inside and outside four walls and two mouths: orbital mouth and cranial mouth. Optic canal had optic nerve and ophthalmic artery through,optic canal after fracturing can cause its stenosis ,optic nerve damage and even blindness,it is hard to conservative cure. Inchoate discovery,determine fracture type for specific optic canal fracture operated indication and select the surgical approaches have help,so as to improve the success rate, reduce the incidence of blindness because of optic canalclinical fractures will help.Conventional CT because the faults are too thick,part of volume effect is big,can not display optic canal details clearly,moreover due to optic canal walls of bone is thin,mainly with the bone cortex primarily,lack of bone marrow tissue , therefore MRI can not directly display optic canal of osteoarthritis constitutes and therefore can not adapt to the rapid development of modern clinical medical diagnosis and surgical technique of urgent need. With spiral CT in clinical application,High-Resolution Computed Tomography (HRCT) with its volume data acquisition,excellent multiaxial bits and 3D imaging technology,greatly widened CT of the clinical application of scope. Past studies has found that adopts HRCT,anterior clinoid process as the center,the combined use of the horizontal axis of the bit add coronal scan,can display optic canal fractures of the type and extent well,so HRCT and Multiplanar reconstruction imaging have become the most beneficial supplement of after optic canal lesions of conventional shaft a CT scan,can for clinical judgment whether injury and damage degree have very important significance.Objective: Application of ocular trauma in multislice CT after fractures of the optic canal patients were optic canal volume scanning and 3d reconstruction, Comparing the fracture detection under different reconstruction methods, and the display of the same type of fracture under different reconstruction methods,provide best, early, accurate and intuitive image data for clinical.Materials and methods: Collect 2009-2010 in our hospital 35 cases optic canal fracture patients,all use Germany SIEMENS company produce the Sensatian16 type spiral CT and UltraFast CT that PHILIPS company produce for orbital department volume scanning, obtain raw data. After a scan 5mm respectively based on 0.8 mm thick and intervals reconstruction,the former as traditional regular scans were compared , the latter application of 3D reconstruction software more planar reconstruction and 3D reconstruction,including MPR technology reconstruction sagittal bits,coronal reconstruction,SSD reconstruction and MIP reconstruction,reconstruction after the data to the workstation,Comparing the different ways of optic canal reconstruction under fracture degree, classification. Image analysis is in the horizontal axis of the throne observation optic canal of osseous composition,the normal form,around adjacent relation and fracture degree,parting. For optic canal for bilateral,in the paper according to the "eye" carries on the analysis.Use statistical methods to evaluate optic canal fractures in conventional CT scan, HRCT many plane image reconstruction and the display of 3D reconstruction.Results: Conventional CT scan showed a shaft fracture rate of 34.21%. HRCT shaft bits with coronal, planar reconstruction sagittal bits of visual display fracture rate of 100% ,and optic nerve can be clearly shows the archdiocese of anatomical structure, relations with neighbours and fracture type, accurate judgement of the bone fragment displacement direction and degree, the size of the bone fragments measurement.3D reconstruction SSD and MIP fractures showed rate was 65.79%,show not beautiful mainly for fracture displacement is lesser,fracture line is relatively short.Conclusion: The HRCT and many plane reconstruction imaging (MPR technology),can very good showed normal optic canal of the anatomical structure,spatial relations with neighbours,fully display optic canal of fracture,and accurate judgement of the fracture type and degree,so in optic canal fracture has greatly superiority , has become the most beneficial supplement for conventional shaft a CT scan. 3D reconstruction in optic canal fracture shows better than conventional CT ,and its space stereo sense is stronger,can provides stereo close to anatomical image data for clinicians,easy to formulate rational treatment,has certain clinical value. Anyhow,with MSCT clinical application, MPR technology and the 3D reconstruction technique combined application, optic canal fractures of the inchoate discovery,inchoate cure will be more perfect.