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The total number of fontanels in an infant
Six - Anterior, Posterior, Right and left sphenoid, Right and left mastoid
The landmark that corresponds with the level of the petrous ridge (Todd's Question, double barrel)
An average shaped skull with a 47 degree angle between the petrous pyramids & the midsagittal plane
Situation: A radiograph of an AP axial projection of the cranium reveals that the dorsum sellae is projected below the foramen magnum but the anterior arch of C1 is visible within the foramen. Name the Error.
Insufficient flexion of the head and neck
The projections that best visualize the anterior clinoid processess of the sella turcica
AP axia, CR 30 degrees caudal to IOML
Situation: A radiograph of a submentovertex projection of the cranium reveals that the mandibular condyles are projected into the petrous pyramids. What must be fixed?
Increase the extension of the skull
Situation: A radiograph of a PA axial projection (caldwell method) of the cranium reveals that the petrous ridges are located at the level of the lower 1/3 of the orbits. The tech performed this projection with the CR 15 degrees caudal to the OML. How must this be fixed?
None of the above; positioning was correct
Situation: A radiograph of a lateral projection of the cranium reveals that the orbital plates are not superimposed, 1 is slightly superior to the other. What is the error?
Situation: A radiograph of a lateral cranium reveals that the mentum was cut off from the bottom of the radiograph. A 10 x 12 IR was used and placed crosswise. What must be fixed for the repeat?
Nothing; Centering & IR placement were correct
Situation: A patient comes to radiology for a routine study of the cranium. He is unable to flex his head & neck sufficiently to place the OML perpendicular to the IR for the AP axial projection. What should the tech do to compensate for this problem without creating excessive magnification of the skull?
Use the IOML & increase CR angle by 7 degrees
Situation: A patient enters the ED with a possible basilar skull fracture. Which skull projection would best demonstrate any blood present in the sphenoid sinus?
Horizontal beam lateral projection
Situation: A patient comes to radiology with a history of a possible erosion of the foramen rotundum. Which projection would best demonstrate this structure?
PA axial with a 30 degree caudal angle to OML
Situation: A patient comes to radiology with a possible bone cyst within the squamous portion of the frontal bone. Which projection would best demonstrate this region with a minimal amount of distortion of the frontal bone?
AP axial with a 30 degree caudal angle to OML
Situation: A patient comes to radiology for a study of the sella turcica. Which routine projections would best demonstrate this structure?
AP Axial and Lateral
TRUE or FALSE: The PA Axial projection (HAAS method) fro the cranium requires a CR angle of 25 degrees Caudad
TRUE or FALSE: The submentovertex projection requires that the IOML is placed parallel to the IR
Situation: When using a 30 caudad angle for the AP Axial (Towne) projection of the skull, which positioning line should be perpendicular to the IR?
The cranial bone that is best demonstrated with a PA Axial (HAAS method) projection of the skull
The positioning error that is present if the mandible rami are not superimposed on a lateral skull
The projection of the cranium that produces an image of the frontal bone with little or no distortion
The name of the paired collections of bone found inferior to the cribriform plate that contain numerous air cells & help form the lateral walls of the nasal cavity
the structures that appear as scroll-like projections on a radiograph and found in the nasal cavity
The number of facial bones that help make up the bony orbit
CR centered for a lateral projection of the facial bones
Zygoma, midway between the E.A.M. and the outer canthus
The CR exit point for a modified parietoacanthial (mod. waters) projection of the facial bones
The positioning line is placed perpendicular to the plane of the IR with a true lateral nasal bone projection
A fracture involving the facial bones where a blow to one side causes a fracture to the opposite side
With the use of erect positions, what other technical factor is important to demonstrate air/fluid levels in para-nasal sinuses
Horizontal x-ray beam
The C.R. exit point for a modified parieto-acanthial "modified Waters" projection of the facial bones
The 7 bones that form the bony orbit
Lacrimal, Ethmoid, Frontal, Sphenoid, Palatine, Zygomatic, Maxilla
The fracture that results from a direct blow to the orbit leading to a disruption of the inferior orbital margin
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