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Cranium Projections

QuestionAnswer
What projection of the skull requires the central ray (CR) to be centered to exit at the glabella? Posteroanterior (PA)
How is rotation evident on a lateral projection of the skull? Anterior and Posterior separation of symmetric vertical bilateral structures
What projection of the skull requires the sagittal plane to be parallel to the image receptor (IR) and the interpupillary line to be perpendicular to the IR? Lateral
Where is the CR centered for a lateral projection of the cranium? Two inches superior to EAM
What is the difference, in degrees, between the infraorbitomeatal and orbitomeatal lines? 7 to 8 degrees
Which one of the following cranial projections will best demonstrate a possible basilar fracture? Horizontal beam lateral
Which positioning line should be perpendicular to the plane of the IR for the AP axial (Towne) projection with a 37° caudad CR angle? IOML
A radiograph of a PA Caldwell projection reveals that the petrous ridges are projected into the lower one third of the maxillary sinuses. Which of the following modifications should be made during the repeat exposure to produce a more diagnostic image? Nothing; accept the initial radiograph
He is unable to flex his head and neck sufficiently to place the OML perpendicular to the IR for the AP axial projection. What should the technologist do to compensate for this problem without creating excessive magnification of the occipital bone? Use the inferior OML and increase the CR angulation by 7 degrees
The submentovertex projection requires that the inferior OML (IOML) is placed parallel to the image receptor. True
Which one of the following errors most often results in a repeat exposure of a cranial position? Rotation
Which one of the following technical considerations is most critical for demonstrating air and/or fluid levels within the cranium? Erect or horizontal x-ray beam positioning
(AP) axial projection of the cranium reveals that the dorsum sellae is projected below the foramen magnum, but the posterior arch of C1 is visible within the foramen. Which of the following positioning errors led to this radiographic outcome? Excessive central ray angulation
A radiograph of a lateral projection of the cranium reveals that the orbital roofs (plates) are not superimposed—one is slightly superior to the other. Which of the following positioning errors led to this radiographic outcome? Tilt
When taking a PA Axial projection(Caldwell Method) of the skull, the central ray is directed: 15 degrees caudal
Which Radiographic baseline is used to position the PA axial projection(Caldwell method) of the cranium? The OML
Which Cranial projection best demonstrates the occipital bone? Anteroposterior AP axial (towne method)
What positioning accessory can be used to assist the patient in holding the correct position for an AP axial projection of the skull? A wedge filter
Where do you center for an AP Axial Townes? using the OML? 30 degrees caudal, 2.5in superior to the glabella
Which projection of the Cranium demonstrates the petrous ridges within the orbits? PA skull
Created by: NeayeliReyes
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