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1、SeriesISSN:1930-0328ZHU?RANGAYYAN?ELSSYNTHESISLECTURESONBIOMEDICALENGINEERING&MCMorganClaypoolPublishers&SeriesEditor:JohnD.Enderle,UniversityofConnecticutDigitalImageProcessingDigitalImageProcessingforOphthalmologyDetectionoftheOpticNerveHeadXiaoluZhuandRangarajM
2、.Rangayyan,UniversityofCalgary,Alberta,CanadaforOphthalmologyAnnaL.Ells,AlbertaChildren’sHospital,Alberta,CanadaDIGITALIMAGEPROCEFundusimagesoftheretinaarecolorimagesoftheeyetakenbyspeciallydesigneddigitalcameras.Ophthalmologistsrelyonfundusimagestodiagnosevarious
3、diseasesthataffecttheeye,suchasdiabeticDetectionoftheOpticNerveHeadretinopathyandretinopathyofprematurity.Acrucialpreliminarystepintheanalysisofretinalimagesistheidentificationandlocalizationofimportantanatomicalstructures,suchastheopticnervehead(ONH),themacula,an
4、dthemajorvasculararcades.IdentificationoftheONHisanimportantinitialstepinthedetectionandanalysisoftheanatomicalstructuresandpathologicalfeaturesintheretina.Differenttypesofretinalpathologymaybedetectedandanalyzedviatheapplicationofappropriatelydesignedtechniquesof
5、digitalimageprocessingandpatternrecognition.Computer-aidedanalysisofretinalimageshasthepotentialtofacilitatequantitativeandobjectiveanalysisofretinallesionsandabnormalities.Accurateidenti?cationandlocalizationofretinalfeaturesandlesionsSSINGFOROcouldcontributetoim
6、proveddiagnosis,treatment,andmanagementofretinopathy.Thisbookpresentsanintroductiontodiagnosticimagingoftheretinaandanoverviewofimageprocessingtechniquesforophthalmology.Inparticular,digitalimageprocessingalgorithmsandpatternanalysistechniquesforthedetectionoftheO
7、NHaredescribed.Infundusimages,theONHusuallyappearsasabrightregion,XiaoluZhuwhiteoryellowincolor,andisindicatedastheconvergentareaofthenetworkofbloodvessels.UseofthePHTgeometricalandintensitycharacteristicsoftheONH,aswellasthepropertythattheONHrepresentstheRangaraj
8、M.Rangayyanlocationofentranceofthebloodvesselsandtheopticnerveintotheretina,isdemonstratedindevelopingHALMOLOGYthemethods.AnnaL.EllsTheimageprocessingte
