BONTRAGER'S RADIOGRAPHIC
POSITIONING CH. 11, SKULL
(POSITIONING) EXAM QUESTIONS WITH
CORRECT ANSWERS
What are neoplasms? - Answer-New and abnormal growths
What is an Osteolytic lesion? - Answer-Destructive lesions with irregular margins
What is an Osteoblastic lesion? - Answer-Porliferative bony lesions of increased density
What are combination osteolytic and osteoblastic lesions? - Answer-Lesions with a
"moth-eaten" appearance of bone because of the mix of destructive blastic lesions
What is Paget's disease? (osteitis deformans) - Answer-Bony destruction followed by
bony repair. "cotton-wool" appearance.
What are the measurements of an average skull? - Answer-15cm (between the parietal
eminences), 19cm (from frontal eminence to external occipital protuberance), 23cm
(from vortex to beneath the chin)
What is Mesocephalic? - Answer-width is between 75%-80% of the length
What is Brachycephalic? - Answer-Width is 80% or more of length
What is Dolicephalic? - Answer-Width is less than 75% of length
What are the slices used in CT? - Answer-Axial (transverse), Sagittal or Coronal planes
What clinical indications would you use the AP Axial Projection of the skull for? (Townes
Method) - Answer-Paget's disease, skull fractures and neoplastic processes.
What is the CR and it's angle (if any) that is used for the AP Axial Projection of the
skull? (Townes Method) - Answer-Angle CR 30° caudad to OML, or 37° caudad to
IOML, centered at 2 1/2" above the glabella
Should the C1 be visualized in the image of an AP Axial Projection of the skull?
(Townes Method) - Answer-No. If it is visualized, there is overangulation of the CR or
excessive flexion of the neck.
What anatomy is demonstrated in the AP Axial Projection of the skull? (Townes
Method) - Answer-Occipital bone, petrous pyramids and foramen magnum, dorsum
sallae, posterior clinoid in the shadow of the foramen magnum
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