Extraoral Radiography口外照相技术.ppt
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1、Extraoral Radiography Used for Panoramic,Lateral Jaw,Cephalometric,Skull and TMJ views,X-ray MachineIntraoral may be used for extraoral films but not recommendedPan/Ceph standard for ortho,oral surgeryExtraoral/Specialty rotating anode;because of high mA,long exposure,Intraoral,Pan/Ceph,Specialty Ex
2、traoral,Head Positioner/Film Holder,cassette holder,head positioner,Cassette/Film,Extraoral Film T-Mat(G,L,H)Ektavision5”x 12”,6”x 12”,8”x 10”,grid,primary x-rays,scatter radiation,film,Grid,intraoral,central ray enters 2”above,”behind EAM,Transcranial TMJ,Identify changes in TMJ region,red arrow=he
3、ad of condyleblack arrow=glenoid fossa,Lateral Cephalometric,Identify trauma,abnormalitiesAssess facial growth;treatment record,film at set distance from MSP,film horizontal,extraoral x-ray unit,MSP,floor,MSP,Simpson,Homer 12/2/02,Posteroanterior(PA)Skull,Identify trauma,pathology,ordevelopmental ab
4、normalities,FP,floor,MSP,extraoral x-ray unit,Taken with intraoral x-ray machine.(Note round collimation).Not recommended,but possible.,Waters,Evaluate the maxillary sinus,MSP,floor,extraoral x-ray unit,(Sinus view),tip of nose 1”from cassette,CR,FP,Submentovertex,Identify location of condylesImage
5、zygomatic arch fracture,floor,MSP,extraoral x-ray unit,floor,FP,central ray,Reduce exposure to 1/3 SV setting,Zygomatic Arch View,Reverse Townes,Image fractures of the condylar neck,head tipped down mouth open,extraoral x-ray unit,floor,MSP,CR,FP,Caldwell,Identify trauma,especially to area of orbit,
6、extraoral x-ray unit,floor,(Orbit view),tip of nose and chineven with cassette,MSP,CR,FP,Tomography(Laminography),Used to image TMJ X-ray procedure Images layer or slice Objects outside slice are blurred,Linear Tomography,Corrected Tomography,Linear,Linear,Multi-directional,Transcranial,Panoramic Fi
7、lm(special computer positioning),Computed TomographyX-ray procedure2.Section or slice imaged 360-degree rotation of x-rays/detectors Radiation/detector/computer/image,(CT),Computed Tomography,x-ray source,360 rotation,detectors,Computed Tomography,Fan beam,x-ray tube,collimator,detectors,Able to ima
8、ge soft tissue without contrast agents,Magnetic Resonance,Magnetic field aligns atoms(Hydrogen)Radiowaves alter alignment Atoms realign,releasing energy Computer produces image,NO IONIZING RADIATION,0,Magnetic Resonance,radiofrequency coils,Magnet,sliding table,ArthrographyRadiopaque contrast agent
9、injected into joint2.Articular disk outlined3.X-ray procedure(fluoroscopy,tomography),TMJ Imaging,MRI No Yes Arthrography Yes Yes CT Yes Yes Tomography Yes No Transcranial Yes No Panoramic Yes No,X-ray Disk,Sialography X-ray procedure2.Radiopaque contrast agent3.Images salivary glands and ducts,Scin
10、tigraphy(Radionuclide Scan)Radioactive pharmaceutical agent2.Tissue specificity3.Gamma rays emitted4.Gamma camera image,UltrasoundHigh-frequency ultrasonic vibrations2.Echoes at tissue density differences3.Varying echo intensities image NO IONIZING RADIATION,Ultrasound echoes,Cone Beam CT,Cone-shape
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- Extraoral Radiography口外照相技术 Radiography 口外 照相 技术
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