| Optic canal is an important channel of cranial orbital communication,it is intracranial optic nerve and ophthalmic artery into the orbital channel,deep within the sphenoid sinus. Optic nerve ischemia or edema isseriously affect vision can even lead to loss of vision. And optic canaldecompression is the treatment of optic nerve ischemia and edemadisease directly effective treatment measures. But as a result of opticcanal deep in sphenoid sinus, bordering the internal carotid artery,cavernous sinus, pituitary, decompression surgery is likely to hurt thoseimportant organs, leading to massive hemorrhage, and even lifethreatening. Therefore the majority of patients in the hesitation, waiting tosee delay the optimal timing of surgery. How to reduce the risk of theoperation, increasing the precision is the problem to be solved. Therefore,preoperative full understanding of the position of the optic canal insphenoid sinus, and its surrounding tissue structure, reasonable pathplanning surgery, and navigation links such as real-time monitoringoperation mode will greatly reduce the risk of surgery.Along with the advance of science and technology, surgical navigation technology has been increasingly widely used in the medicalfield, but the current navigation system is a general system, not for opticcanal decompression surgery for analysis, so this article, in collaborationwith Shanghai ninth people’s hospital of ophthalmology of optic nervedecompression operation of computer aided navigation visualization partcarried out the following research:(1) Based on the CT imaging of optic canal and the internal carotidartery optimization study of3D reconstruction technology. Throughgathering the patient’s CT image interpolation is used to change the2Dimage into a3D image display, part of internal carotid artery by injectionof contrast agents can be enhanced so that in the later on thesegmentation.(2) On the basis of these conditions with the aid of internal carotidartery and optic canal reconstruction technology simulation reproduce theimage of sphenoid sinus cavity. Through the center of the pipeline alongthe resampling, then split the resampling part by hand for internal carotidartery and optic canal. For the parcel at the ends of the bony structure ofoptic canal not closed to the specialized design, in view of the specialty ofthe optic canal take the necessary way of reconstruction.(3) The surgery path in the process of virtual roaming for surgery.Roaming through the preset route can be, to get the most suitable surgerypath and might have happened to one of a kind of simulation, can choose path, and also can switch at any time to want to see the location of thejudge for the doctor.(4) In the process of the virtual navigation scene fast rendering. Tohave3d model for mesh simplification, is to maintain the existing in itsshape under the condition of no change, reduce the number of triangles,thus reducing the amount of data is processed by the computer in thedrawing process, from raising the speed of drawing.(5) The endoscopic surgery simulation images and surgicalnavigation technology integration, the deep structure of3d real-timeoverlay, by DCMTK, the processed image is VTK technology willrewrite writes data, DICOM medical navigator in DICOM data back intothree-dimensional images.In this paper, the optic nerve decompression navigation visual imagesegmentation techniques,3D model reconstruction technique, andgenerate DICOM roaming technology, combination of preoperative statusanalysis, path planning, and navigation links, the preoperative analysis iscombined with intraoperative guidance. Help doctors to achieve operationanalysis, provide safe and minimally invasive surgery. |
PDF Full Text Request