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Skull Positioning


What are the views for Sinuses? Lateral, Caldwell, Waters, SMV
In the views of sinuses, the patient is always _______ and the CR is __________. upright, horizontal
Describe the patients position in the Lateral Sinuses. Patient is upright in an RAO or LAO with te head turned lateral
What line(s) are parallel and which line(s) are perpendicular? MSP and IOML are parallel, IPL is perpendicular
What is the entrance point of the central ray for lateral sinuses? perpendicular, entering 1/2 - 1" posterior to outer canthus
What is demonstrated in Lateral Sinuses? All four sinus groups, superimposed orbital roofs, mandibular rami, sinuses clearly visible, air/fluid levels, no rotation of sellla turcica
Which group of sinuses are primarily seen? sphenoid
What SID is used for the lateral sinuses? When is the SID changed? 40" SID except when for pre-op it should be done 72" SID
If patient is unable to sit upright for lateral sinuses, what can be done to show air/fluid levels? cross-table lateral
What kVp do we use for skull work? 65-75 kVp
Describe the patients position for the Caldwell Sinuses? Upright, OML perpendicular and then lift chin up so that the OML is 15 degrees from perpendicular
The central ray exits the ______ in the Caldwell Sinuses. nasion
What is the angle of the CR in the Caldwell Sinuses? There is no angle. The CR is perpendicular.
What is demonstrated in the Caldwell Sinuses? Frontal sinuses above the frontonasal suture, ethmoid sinuses above the petrous ridges, Petrous ridges in lower 1/3 of orbit, lateral borders of skull equal, close collimation
What is another name for the Waters sinuses view? parietoacanthial projection
Describe the patients position in the Waters sinus view? Patent is upright with chin extended. MML perpendicular.
The OML forms a ________ to film in the Waters sinus view. 37 degree angle
The central ray exits at the ______. acanthion
Petrous pyramids inferior to floor of maxillary sinuses, maxillary sinuses ar demonstrated in what view of the sinuses? Waters
SMV stands for ________. submentovertical
Describe the patients position for the SMV sinuses. Patient is upright with neck extended back to place the crown of head on IR.
What line is parellel to the film? IOML
In the SMV sinuses, the CR enters _______ to the ______ throught the _______. perpendicular, IOML, Sella turcica
If an SMV sinuses is not able to be done, what other method can be done? Open mouth Waters
What is best demonstrated in the SMV sinuses? sphenoidal and ethmoidal air cells
What is demonstrated in the SMV sinuses? sphenoidal and ethmoidal air cells, anterior frontal bone superimposed by mandibular symphysis, mandibular condyles anterior to petrous pyramids, no rotation
Created by: sr4095