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Basic Skull Position

flashcards

QuestionAnswer
What is the average kV range for analog skull radiography? kV range for digital imaging? Analog: 65-75 kV Digital: 75-90 kV
List the 5 most common errors made during skull radiography? Rotation, Tilt, Flexsion, Extension, Incorrect Angle
Which cranial bone is best demonstrated with an AP Axial (Towne method) projection of the skull? occipital
When using a 30* caudad towne method of the skull, which positioning line should be perpendicular to the IR? OML
A properly positioned Towne method should place the dorsum sellae into the middle aspect of the: Foramen magnum
A lack of symmetry of the petrous ridges indicates which positioning error with an AP axial projection? Rotation
What CR angle should be used for the PA Axial (Haas method) 25* cephalad
Where is the CR centered for a lateral skull? 2" above the EAM
Where will the petrous ridges be projected with a 15* PA Axial (Caldwell) of the skull? the lower 1/3 of the orbits
Which specific positioning error is present if the petrous ridges are projected higher in the orbits than expected for a 15* PA Axial/Caldwell? Excessive flexion or insufficient CR angle
Which projection of the skull produces an image of the frontal bone with little to no distortion? PA Skull
What positioning error has been committed if the EAMs are not superimposed with one more superior than the other on the lateral skull? Tilt
What line is parallel to the IR for the SMV? IOML
What position best demonstrates the sella turcia in profile? Lateral
what position best demonstrates the clivus in profile? Lateral
where does the CR exit for a Haas method of the skull? 1.5" (4 cm) superior to the nasion
Critical Thinking: A 15* PA Axial (Caldwell) of the skull reveals that the petrous ridges are projected at the inferior orbital margin. What is the positioning error? Excessive Extension or excessive caudad angle project the petrous ridges lower than expected. (they should be in the lower 1/3 of orbits)
Critical Thinking: An xray of the SMV position of the skull reveals the mandibular condyles are with the petrous bone. What error led to this? Insufficient Extension of the skull or the CR was not perpendicular to the IOML
For a PA waters the petrous ridges should be projected directly below the: Maxillary sinuses
For a Modified waters the petrous ridges should be projected below the: orbital rims
which sinuses are best demonstrated with a PA Caldwell projection? Frontal and anterior ethmoid sinuses
Which group of sinuses is best deomstrated with a waters position? Maxillary sinuses
which sinuses are projected through the oral cavity with the PA axial transoral projection? Sphenoid
Created by: rachelreilly