Nasal Bone Anatomical Structure Observation And Clinical Study Of Multi-slice Spiral CT Scan

Objective: The nasal bone is shallow and thin,and is more prone to fractures relative to other bones when subjected to external forces.The fracture line is the direct sign of bone fracture.The normal anatomic structure of nasal bone in the CT scans is very similar to fracture line,hence this often results in misdiagnosis.In recent years,with the rapid advancement in the imaging diagnosis technology,many experts have done a lot of research on the CT scan of the nasal bone microscopic anatomical structure and also the diagnosis of fractures,but the description of their studies is not comprehensive.In this paper,the distribution of the fine anatomical structure of the dry cranial specimen and the normal adult nasal bone anatomical structure were analyzed by multi-slice spiral CT.The results were compared with that of nasal bone fractures to notice the differences.Summing up,this approach improves diagnosis capability of the doctors of the nasal fracture,hence it avoids misdiagnosis.Methods: First method: 100 cases of nasal trauma were treated by routine scanning and thin-layer reconstruction of Siemens 16 rows of SOMATOM Definition AS(German Siemens Medical Group).The bone morphological features of thin layer images of nasal bone were analyzed.From the 2.0,observe the use of bone window observation,window width2000Hu: window 200 Hu: and the original image uploaded to the WIZARD workstation for VR reconstruction,MPR reconstruction and other post-processing reconstruction,the observation of the fine anatomy.And 20 dry cranial specimens were observed and the relevant data of the area were measured.One case of dry craniotomy was used to dissect the nasal bone along the bone to understand its neighborhood relationship.Second method: Forty patients with nasal bone trauma were examined by volume of the whole nasal thin layer,and the volume scan data were reconstructed with multiple spiral CT(MDCT).The data were reconstructed by MPR,VR and MIP,and then the volume data The CT algorithm was used to reconstruct the cross-sectional image and print the film,and the difference between the two methods of nasal bone fracture identification is studied.Results:1 Nasal bone is composed of left and right basic symmetrical blocks of small bone,The average length is male 27.6mm,female 26.4mm,Bone is thin.The fine anatomical structure of the normal nasal bone consists of four joints,two holes and one edge.Four points refers to the left and right nasal jaw,nasal fissure and nasal septum,two holes for the left and right nasal bone hole,the edge is the edge of the nasal bone.The nose is stuck in the coronal plane image is not a small jagged translucent shadow.Nasal intertrochanteric on the coronal scan image is not easy to observe,cross-sectional images show more clearly.Nasal jaw can be seen as swelling type,flat type,occlusal type,interosseous bone type and thin nasal bone type.Nasal bone holes are mostly small holes,a few individuals can be linear strip,different sizes,where the existence of a large individual differences.The lower edge of the nasal bone uneven,can be divided into straight type,wave type,inverted spike type,crescent spade and other types.Variation of the nasal bone includes: the outer edge of the nasal bone "adduction" or "running down and outside" variation;intertrochanteric and "hump" or "olecranon".2 Volume scan and postprocessing without shifting linear fracture 25 cases,radiographic diagnosis in 38 cases,the diagnosis rate was 36.8% and55.9%;volume scan and postprocessing diagnosis with displaced linear nasal bone fracture in 18 cases,radiographic diagnosis in 8 cases,the diagnosis rate was 26.5% and 11.8%;volume scan and postprocessing diagnosis 12 cases of comminuted fracture,11 cases of radiographic diagnosis,diagnosis rate were17.6% and 16.2%;volume scan and postprocessing diagnosis of complex fractures in 13 cases,radiographic diagnosis in 11 cases,the diagnosiscoincidence rate were 19.1% and 16.2%;the difference was statistically significant with linear and linear nasal bone fracture with displacement of the shift two methods of diagnosis between(P< 0.05).Workstation soft reading can confirm the diagnosis of nasal bone fracture,can accurately distinguish between nasal bone,nasal cavity,normal variation,frontal fracture and linear nasal bone fracture,to determine the direction of nasal bone fracture,fracture and fracture displacement.3 Nasal bone fractures and nasal bone microstructure identification methods: 1)familiar with the location of the nasal bone structure,shape and image characteristics,as a basis for fracture and fracture of the nasal bone fractures.2)should be based on two-dimensional image of a variety of reorganization of the combination of a variety of methods,through the computer's own logo function,point-to-point observation can improve the accuracy of diagnosis.Conclusions:1 The nasal anatomic structure form and diversification of large individual differences,using MDCT scanning and 3D reconstruction scheme with variety,can accurately display the location and shape of nasal anatomic structure and characteristics.2 Volume scan combined with post-treatment technology in the diagnosis of nasal bone fracture has very important application.3 Familiar with the characteristics of the normal nasal bone fine structure of the MDCT image and the differential diagnosis of nasal bone fracture,can greatly improve the accuracy of diagnosis of nasal bone fracture,reduce misdiagnosis and missed diagnosis.