Protocolo TC oidos
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Protocolos – Consideraciones TC Oidos
TM Mg . phD© Cristian Cabrera G.
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Recuerdo AnatomicoOido Externo:
Pabellon Auricular y CAE
Oido Medio: m. Timpanica, cadena
huesecillos, caja timpanica
Oido Interno: coclea y vestibulo
CAI:Nervios facial,coclear y
vestibulares superior e inferior(estatoacustico)
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Oido Medio
• Compartimiento Aereo ubicado entre Oido externo e interno.
• Revestido por mucosa tipo respiratoria.
• Contiene a la m. Timpanica, cadena de huesecillos y caja timpanica.
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Oido Medio
Membrana Timpanica
Cadena de Huesecillos
Caja Timpanica
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Oido Medio
Caja Timpanica
Tegmen Tympani
P. Medial: Promontorio.Ventanas
oval y redonda
Pared Anterior o Carotidea
Pars Yugularis; separa de vena yugular
interna
Pared Lateral:M. Timpanica,Receso
Epitimpanico
Pared Posterior o mastoidea(aditus ad
antrum)
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Oido Medio
Cadena de Huesecillos
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Oido Medio
Cadena de Huesecillos
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Oido Medio
Cadena de Huesecillos
Martillo: 8 – 9 mm.Cabeza, cuello , mango, procesos anterior y lateral
Yunque : 7 mm.Cuerpo, procesos corto y lenticularArticula con cabeza martillo y estribo
Estribo: 3,3 mm.Cabeza, cuello, 2 ramas y platinaArticula con lenticular del yunque y con ventana oval
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Oido Interno
Hueso Petroso
S. Vestibular(Post)
S. Coclear(Ant)
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Hueso Petroso
S. Coclear(Ant)
Coclea: informacion de la audicion
Movimiento cilios
Convierte vibracion sonido en impulso nervioso
Nervio coclear a corteza auditiva
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Hueso Petroso
S. Coclear(Ant)
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Hueso Petroso
S. Vestibular(Post)
Utriculo: Posicion Estatica
Saculo
Canales Semicirculares(aceleraciones y desaceleraciones angulares)
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Hueso Petroso
S. Vestibular(Post)
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Conducto Auditivo Interno
1.N. Vestibular.2. N. Coclear. 3. N. Facial .
4. G. Geniculado6. Coclea
7. C. Semicirculares8. H. Martillo9. Timpano
10. Trompa de Eustaquio
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Resumiendo….
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Y la Anatomia en TC ??
• Estructuras anatomicas muy pequeñas.• Diferencias de Coeficientes de Atenuacion
elevada (Hueso,Aire,Contenido acuoso).• Coeficiente de Atenuacion muy elevado puede
generar artefactos en las imágenes.• Necesidad de generar alta resolucion espacial.
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Protocolos OidosAxial Convencional Axial
Axial ConvencionalCoronal
Helicoidal Multicorte Volumetrico
Espesor,Config. 1.0 1.0 0.625/0.3
Angulacion Gantry LOM Perpendicular LOM
axial
SFOV 25 25 25
Kv 120-140 120-140 120-140
Ma 100-160 100 400~
DFOV 16-- 9 16 16/ 8-9
Algoritmo Hueso ++ Hueso ++ Hueso
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Parametros a considerar…Adquisiscion Helicoidal-
SecuencialCobertura Minima Matriz Detectores
Espesor de corte minimo
Pitch minimo
DFOV Comparativo y selectivo
Kv 140-120
Filtro Alta Frecuencia
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Protocolo TC Oidos Siemens 16
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Protocolo TC Oidos Siemens 64
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Protocolo Oidos TCMC
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Adquisicion Oidos.Plano Axial
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Oidos Plano Axial
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Plano Coronal
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Plano Coronal
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Proyecciones Especiales Oidos
• Proyeccion de Poschl; Plano en 45º oblicuo,perpendicular al eje mayor del peñasco(siguiendo el canal semicircular superior).
• Visualiza el eje largo de la coclea.• El CSS se visualiza como un anillo con su arco
entero en la pared superior.
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Poschl
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Plano de proyeccion de Poschl
CSSAmpolla del CSS CSP
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Proyecciones Especiales de Oido
• Stenvers; Perpendicular al plano de Poschl.
• Permite Visualizar eje corto de la Coclea con sus giros y la cortical superior del Canal Semicircular Superior.
• Ademas visualiza Acueducto Vestibular,Ventana redonda.
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Stenvers
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Plano de proyeccion de Stenvers
Vestibulo
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Indicaciones TC Oidos• Colesteatoma• Otitis• Mastoiditis• Tinnitus• Hipoacusia• Ruptura Timpanica• Otoesclerosis• Enf. Paget• Osteomas• Paralisis Facial• Traumatismo
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