principles parasinuses Flashcards
Frontal sinuses
____ and ____
Most _______
Inner and outer
Most symmetrical
Maxillary sinuses
.
Ethmoid sinuses
Communicate with ____ sinuses
Shown best in _____ projection
Communicate with sphenoid sinuses
Shown best in lateral
Sphenoid sinuses
Below ____ ____
Shape is _____
Below sella turcica
Asymmetrical
Routine for paranasal sinuses (4)
Lateral- right or left
Pa Caldwell
Waters
Smv
All positions with parasinuses should be done_____
Upright/erect
Lateral para nasal sinuses
Sides done
Technique-
Sid -
Ir
_____ or ____ position
Centers cassette about ____to ___in posterior to outer ____ closest to film
Patients head in ____ lateral position
_______ plane is parallel with plane of film
_______ line is perpendicular to the plane of the ir
Immobilize head
respiration
Central ray
perpendicular entering ____to____inch posterior to outer ____ farthest from film( midway eam and outer canthus)
Right ir left done side if pain
Technique- 65-70 KVp 25 mas
Sid - 72
8x10 lw
Rao or Lao position
Centers cassette about 1/2 to 1 in posterior to outer canthus closest to film
Patients head in true lateral position
Median sagital plane is parallel with plane of film
Inter pupillary line is perpendicular to the plane of the ir
Immobilize head
Suspend respiration
Central ray
perpendicular entering 1/2 to 1 inch posterior to outer canthus farthest from film( midway eam and outer canthus)
Structures shown lateral para nasal sinuses
Anthropometric and super inferior dimensions of ____,their relationship to surrounding structures and thickness of the outer table of ____ bone
____in Sid-(ffd) to minimize____ and distortion
Anthropometric and super inferior dimensions of sinuses, their relationship to surrounding structures and thickness of the outer table of frontal bone
72 in Sid-(ffd) to minimize magnification and distortion
Evaluation criteria lateral para nasal sinuses
All ____sinus groups- ____ sinus is of primary importance
No rotation of ___ _____
Superimposed ____ roofs; mandibular ____
Sinuses clearly visible
Beam restriction
All 4 sinus groups- sphenoid sinus is of primary importance
No rotation of sella turcica
Superimposed orbital roofs; mandibular rami
Sinuses clearly visible
Beam restriction
Caldwell para nasal sinuses
Patient position
Shows- (2)
___ or ____ position pa
Patients hands besides head on grid
_____ plane midline of grid
Forehead/ nose on grid so _____ is perpendicular to plane of film
Raise chin ____degrees placing _____ from horizontal or tilt Bucky 15 degrees
Central ray
Suspend respiration
Perpendicular to plane of film exiting the _____
Pa
Shows- frontal sinuses, anterior ethmoid sinuses
Seated or standing position pa
Patients hands besides head on grid
Midsaggital plane midline of grid
Forehead/ nose on grid so oml is perpendicular to plane of film
Raise chin 15 degrees placing oml from horizontal or tilt Bucky 15 degrees
Central ray
Suspend respiration
Perpendicular to plane of film exiting the nasion
Why no angle on sinuses?
Air fluid levels
Image criteria caldwell(pa) para nasal sinuses
____ sinuses should be well demonstrated lying above ____ suture and seen without rotation by symmetrical ____ cavities
____ ethmoid sinuses should be seen immediately below frontal ____and on each side of nasal foassae
Petrous ridges should fill ?
Close collimating
Frontal sinuses should be well demonstrated lying above frontonasal suture and seen without rotation by symmetrical orbital cavities
Anterior ethmoid sinuses should be seen immediately below frontal sinuses and on each side of nasal foassae
Petrous ridges should fill lower 1/3 of orbits
Close collimating
Waters para nasal sinuses
Shows maxillary ____, ___ and ____ sinuses
Patients ____ or ____ facing grid
_____ perpendicular
Hands beside head in device
_____ plane of head perpendicular to plane of film and in midline of grid
Adjust head so ____ forms ____degrees angle with film
Suspend ____
Central ray
Prependicular to plane of film to exit _____
Shows maxillary sinuses, frontal and ethmoid sinuses
Patients seated or standing facing grid
Mml perpendicular
Hands beside head in device
Midsaggital plane of head perpendicular to plane of film and in midline of grid
Adjust head so oml forms 37 degrees angle with film
Suspend respiration
Central ray
Prependicular to plane of film to exit acanthion
Image criteria waters para nasal sinuses
_____sinuses demonstrated
Petrous ridges should be seen just below maxillary _____
Maxillary ____ and orbital ____ seen without rotation
____ and ____ sinuses seen distorted
____ sinus not shown
If not extension if neck, petrous ridges will be seen considerable ____maxillary sinuses due to loss of definition of sinuses because of ____
Maxillary sinuses demonstrated
Petrous ridges should be seen just below maxillary sinuses
Maxillary sinuses and orbital cavities seen without rotation
Frontal and ethmoid sinuses seen distorted
Sphenoid sinus not shown
If not extension if neck, petrous ridges will be seen considerable below maxillary sinuses due to loss of definition of sinuses because of magnification
Smv of para nasal sinsues( submentovertical)
Tech -
Shows:
Film:
Patient ____in chair with back against Bucky
Or
_____ in table with support under torso so patient can support head
_______ plane midline to Bucky
_____ neck and red head in vertex
______ plane of head perpendicular to plane of film
_____ parallel to plane of film
respiration
Central ray
Perpendicular to midway between angles of ____ to exit at _____ of skull
Tech - 80 KVp 25 mas
Shows: sphenoid sinuses
Film: 8x10 length
Patient sits in chair with back against Bucky
Or
Supine in table with support under torso so patient can support head
Midsaggital plane midline to Bucky
Hyperextended neck and red head in vertex
Midsaggital plane of head perpendicular to plane of film
Ioml parallel to plane of film
Patient suspend respiration
Central ray
Perpendicular to midway between angles of mandible to exit at vertex of skull
