Imaging Anatomy Research Of CT Reconstruction For Maxillofacial

Objective:According to clinical endoscopic ethmoid sinus surgery area and paper templatesurgical repair of traumatic fractures of the practical needs of multi-CT imaging anatomythrough the study of anatomy in the imaging study on the basis of the ethmoid sinus,in-depth discussion of orbital wall of the weak points in order to identify medial orbitalwall blowout fracture of the reasons for the ethmoid area of clinical surgery and surgicalrepair of orbital wall fracture imaging to provide detailed information to the endoscopicsinus surgery for a safe Surgical landmarks for the paper model of traumatic fracturediagnosis and repair plastic surgery to provide accurate diagnostic criteria for clinicalsuccess of surgery carried out to improve diagnostic accuracy, prevent and reduce theincidence of serious complications and provide a reliable anatomical imaging data andinformation.Methods:1Siemens SOMATOM SENSATION64-slice spiral CT scanning, scan mode: Normalhead scanning and multi-slice spiral CT MPR reconstruction of60patients with normalskull.64-slice CT-VR reconstruction of randomly selected60cases of normal head, whenthe thickness of thin-layer reconstruction image, followed by gradual increase in thicknesswhen the thickness of the thicker, the image shows more briefly. Collected in the normalskull bone mode acquisition and VR reconstruction, in order to find the weak points of theskull in60cases for statistical Scan range: from the mandibular foramen magnum at thebottom center with connections to the baseline, all the whole head scan, the patient supineposition, eyes staring forward, thickness from2mm pitch2mm layer1matrix512X512. Images obtained using MPR (MPR reconstruction) technology line of coronal,sagittal, and ramps restructuring were taken of bone and soft tissue window window toobserve and measure the diameter of the ethmoid bone and the ethmoid line.2orbital wall fracture spiral CT scan and MPR reconstruction of80cases, medial orbital wall damaged area in accordance with the classification and analysis of statistics. Scanrange:1cm to the infraorbital supraorbital1cm.Images obtained using MPR (MPRreconstruction) technology line of coronal, sagittal and ramps reorganization of the orbitalwall fracture type and extent of the damage to system analysis to identify the medial orbitalwall weak point, the discussion orbital pressure is increased To the principle of orbital wallfracture easily obtained medial orbital wall fracture of reasons.80cases of orbital wallfracture patients underwent64-slice spiral CT scan, double-blind method under theconditions of conventional fault diagnosis, data obtained after volume rendering (VR),64-slice CT,"isotropic" of VRsecondary diagnosis in the reconstruction of conditions, twodiagnostic results were compared and the final diagnosis for statistical analysis.3-From the laboratory to find a male and female skull, head to take orbital medialwall of the handsaw sawing, peeling the ethmoid bone to observe the orbital wall of eachlink point calibration, video images are obtained and easy to find the location of the bonestandard.Spiral CT scanning and MPR reconstruction parameters: volume scan,120kV380mA,gantry rotation0.33s/circle, thickness from2mm pitch a512×512array bone window:window level C450, bandwidth W1500; soft tissue window: window level windowC40W80wide scan for coronal, axial and sagittal multiplanar reconstruction.Reconstruction parameters: orientation, like:120KV35mABone window: slice0.75mm recon increment0.7mm kemel H60s sharp windowOlslteo Soft tissue window: slice0.75mm recon increment0.7mm kemel H30s mediumsmooths+window crebrumResults:Weak point of the orbital plate and orbital wall is easy to burst therelationship between fracture location1weak point located1/3and2/3of the33cases more than is located1/3and2/3ofthe27cases the difference was not statistically significant (X2=1.20, P=0.273>0.05).The weak point of the location had no effect in this study.2orbital wall fracture occurred in more than1/3or2/3of the27cases occurred in1/3and2/3of those26cases, but the difference was not statistically significant (X2=0.33, P=0.857>0.05). Ie, fracture involving parts of the non-significant.Conventional tomography (CT) and VR reconstruction of diagnosticresults compared Medial orbital wall fracture in57cases, accounting for71.25%of the80cases oforbital trauma patients confirmed the diagnosis of plain, after the VR reconstructionscreening diagnosis of orbital wall fracture in63cases, accounting for78.75%, theremaining17cases the lateral wall of the fracture or lateral wall of the inferior wall andfracture, accounting for21.25%. Routine conditions of diagnosis, missed diagnosis rate of9.524%(6/63) the VR diagnosis misdiagnosis rate is much less than the conventional faultdiagnostic imaging.Orbital bone joints and fracture texture of VR imaging characteristicscomparedThe study found that in the VR imaging conditions, the orbital suture into two types:1thick bone suture, above the jaw and cheekbones constitute the suture (Figure1A), is set totype Ⅰ;2thick bone and thin bone between the bone joints, the suture between themaxillary and ethmoid bone (Figure1B) above, is set to type Ⅱ. Fracture is divided intothree types: a burst fracture, occurred in the medial orbital wall (Figure1C); b fracturefracture occurred in the fracture thicker orbital walls, such as the inferior orbital wall(Figure1D) and outside sidewall; fractures, bone thicker at the severe trauma. Thecomminuted easy resolution, which I will not elaborate.The ethmoid diameter measurement results see tableConclusion:1slice spiral CT sinus area three-dimensional image reconstruction of the anatomypresented in a more intuitive, the conduct of clinical surgery has an important role inguiding2orbital wall fracture is due to external blunt the impact of orbital orbital pressureincreased, the medial orbital wall bearing pressure exceeds the threshold, the occurrence oforbital blowout fracture364level CT reconstruction of orbital wall for a more detailed observation of thesub-type specific in the diagnosis of orbital wall fracture MPR/VR reconstruction of greatvalue.4ethmoid area because great variation, orbital fracture classification and more thanrelying on three-dimensional CT imaging for surgery is dangerous and easily lead tocomplications. The application of anatomical data, CT images and three-dimensional signsendoscopic sinus surgery, endoscopic position to combine the positioning operation can bebeneficial.5spiral CT scan in the diagnosis of inflammation of the ethmoid sinus area in the initial screening has important clinical significance.