Orthopaedic Imaging: An Aid to Decision Making
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Transcript of Orthopaedic Imaging: An Aid to Decision Making
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Orthopaedic Imaging:Orthopaedic Imaging: An Aid to Decision Making An Aid to Decision Making
Thomas W. Grossman, Jr., M.D., FACSThomas W. Grossman, Jr., M.D., FACS
Watertown OrthopaedicsWatertown Orthopaedics
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Medical Decision Making is a TriadMedical Decision Making is a Triad
History – from patients/recordsHistory – from patients/records Physical ExaminationPhysical Examination Confirming Studies – Imaging, Labs, etc. Confirming Studies – Imaging, Labs, etc.
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ImagingImaging
X-rayX-ray UltrasoundUltrasound CT ScanCT Scan MRIMRI Nuclear MedicineNuclear Medicine
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X-RAYX-RAY
Radiation SourceRadiation Source Patient ExposedPatient Exposed Capture ImageCapture Image Interpret Image Interpret Image
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X-RAYX-RAY
Ionizing Radiation Ionizing Radiation Radiation damages cellsRadiation damages cells No limit on medical radiation exposureNo limit on medical radiation exposure Limits on non medical radiation exposure Limits on non medical radiation exposure
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X-RAYX-RAY
Patient Blocks Transmission of RadiationPatient Blocks Transmission of Radiation Soft tissues LessSoft tissues Less Bones MoreBones More
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X-RAYX-RAY
Capture ImageCapture Image FilmsFilms DigitalDigital
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X-RAYX-RAY
Interpret ImageInterpret Image RadiologistRadiologist Orthopaedist Orthopaedist
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X-RAYX-RAY
Best for:Best for: Hard tissue Hard tissue BonesBones Often combined with other imagingOften combined with other imaging
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X-RAYX-RAY
Fibula FractureFibula Fracture
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X-RAYX-RAY
Fibula FractureFibula Fracture
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X-RAYX-RAY
Fibula FractureFibula Fracture
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X-RAYX-RAY
Fibula FractureFibula Fracture
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X-RAYX-RAY
Femur FractureFemur Fracture
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ULTRASOUNDULTRASOUND
Sound SourceSound Source Patient ExposedPatient Exposed Image CapturedImage Captured Interpret Image Interpret Image
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ULTRASOUNDULTRASOUND
Sound SourceSound Source SonarSonar Can’t hearCan’t hear TransducerTransducer
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ULTRASOUNDULTRASOUND
Patient blocks some sound waves Patient blocks some sound waves Transmits othersTransmits others
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ULTRASOUNDULTRASOUND
Capture ImageCapture Image FilmFilm DigitalDigital
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ULTRASOUNDULTRASOUND
Interpret imageInterpret image RadiologistRadiologist
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ULTRASOUNDULTRASOUND
Determines Solid or Not SolidDetermines Solid or Not Solid Limited UseLimited Use
Rotator CuffRotator Cuff Knee CystsKnee Cysts Deep Vein Thrombosis (blood clots)Deep Vein Thrombosis (blood clots) Pediatric hips (DDH)Pediatric hips (DDH)
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ULTRASOUNDULTRASOUND
Rotator CuffRotator Cuff
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ULTRASOUNDULTRASOUND
Rotator CuffRotator Cuff
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ULTRASOUNDULTRASOUND
Rotator CuffRotator Cuff
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CT SCANCT SCAN
Computerized Axial Tomography Computerized Axial Tomography Similar to X-Ray except in slicesSimilar to X-Ray except in slices
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CT SCANCT SCAN
Radiation source rotates around patientRadiation source rotates around patient Image capture rotates around patientImage capture rotates around patient Computer collects and formats imagesComputer collects and formats images Reformatting after the exam is possibleReformatting after the exam is possible
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CT SCANCT SCAN
Best For:Best For: 3 dimension anatomy3 dimension anatomy SpineSpine ShoulderShoulder HipHip Fractures in jointsFractures in joints
Hard TissuesHard Tissues
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CT SCANCT SCAN
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CT SCANCT SCAN
HipHip
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CT SCANCT SCAN
HipHip
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CT SCANCT SCAN
HipHip
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MRIMRI
Non Radiation cross section imagingNon Radiation cross section imaging Rapid cycling of powerful magnetic field creates Rapid cycling of powerful magnetic field creates
images (all atoms are weak magnets)images (all atoms are weak magnets)
It finds water!It finds water!
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MRIMRI
Images reflect water contentImages reflect water content Bones OKBones OK Soft Tissues ExcellentSoft Tissues Excellent
MuscleMuscle TendonTendon LigamentLigament DiscsDiscs NervesNerves Blood vesselsBlood vessels
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MRIMRI
KneeKnee
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MRIMRI
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MRIMRI
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MRIMRI
ShoulderShoulder
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MRIMRI
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MRIMRI
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MRIMRI
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NUCLEAR MEDICINENUCLEAR MEDICINE
Physiology – what is the body doingPhysiology – what is the body doing Ionizing Radiation InjectedIonizing Radiation Injected Patient emits radiation (delayed)Patient emits radiation (delayed) Image capturedImage captured
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NUCLEAR MEDICINENUCLEAR MEDICINE
Technetium - binds to bonesTechnetium - binds to bones Indium- binds to white blood cellsIndium- binds to white blood cells
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NUCLEAR MEDICINENUCLEAR MEDICINE
Detects ActivityDetects Activity Bone is a living structure Bone is a living structure
FractureFracture CancerCancer InfectionInfection
Does not always specify why activity occursDoes not always specify why activity occurs
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NUCLEAR MEDICINENUCLEAR MEDICINE
Dual Isotope StudiesDual Isotope Studies TechnetiumTechnetium Indium Indium
Detection of InfectionDetection of Infection
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NUCLEAR MEDICINENUCLEAR MEDICINE
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NUCLEAR MEDICINENUCLEAR MEDICINE
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NUCLEAR MEDICINENUCLEAR MEDICINE
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Orthopaedic ImagingOrthopaedic Imaging
What Studies?, When?What Studies?, When? X-Ray – common starting pointX-Ray – common starting point
- Imaging bonesImaging bones
- UltrasoundUltrasound- Solid or cystSolid or cyst
- CT – 3D anatomy – joints & spineCT – 3D anatomy – joints & spine- MRI – soft tissue & edemaMRI – soft tissue & edema- Nuclear Medicine – What are the cells doing?Nuclear Medicine – What are the cells doing?