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Skull Positioning
Sinuses
| Question | Answer |
|---|---|
| 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
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