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D. 1, 2, and 3 - correct answer Which of the following statements is (are) true regarding the PA axial projection (Caldwell) of the cranium? 1. The central ray is directed caudally to the OML. 2. The petrous pyramids are projected into the lower thi...

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  • August 14, 2024
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  • 2024/2025
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RR: 2.1 Head
D. 1, 2, and 3 - correct answer Which of the following statements is (are) true
regarding the PA axial projection (Caldwell) of the cranium?

1. The central ray is directed caudally to the OML.

2. The petrous pyramids are projected into the lower third of the orbits.

3. The frontal sinuses are visualized.

A. 1 only

B. 1 and 2 only

C. 1 and 3 only

D. 1, 2, and 3



A. Mandibular angle - correct answer What is the anatomic structure indicated
by number 1 in the radiograph shown in Figure 6-20?

A. Mandibular angle

B. Coronoid process

C. Zygomatic arch

D. Maxillary sinus



B. Angle the CR cephalad - correct answer What should be done to better
demonstrate the mandibular rami seen in PA projection in Figure A?

A. use a perpendicular CR

B. angle the CR cephalad

C. angle the CR caudad

D. oblique the head 15° medial



C. erect PA, chin extended, OML 15 degree from horizontal - correct answer
Which of the following methods was most likely used to obtain the image seen in Figure 2-6?

A. erect PA, chin extended, OML forming 37 degrees to IR

, B. erect PA, OML, and CR perpendicular to IR

C. erect PA, chin extended, OML 15 degree from horizontal

D. erect PA, chin extended, OML 30 degree from horizontal



A. 25° to 30° caudad. - correct answer When modifying the PA axial projection
of the skull to demonstrate superior orbital fissures, the central ray is directed A. 25° to 30° caudad.

B. 20° to 25° cephalad.

C. 30° to 35° caudad.

D. 30° to 35° cephalad.



B. 10 - 15 degrees caudal, exiting the nasion - correct answer A properly
positioned PA axial (Caldwell) projection of the skull directs the central ray:

A. 15 - 20 degrees cephalad, exiting the acanthion.

B. 10 - 15 degrees caudal, exiting the nasion

C. 10 - 15 degrees caudal, exiting the glabella.

D. 30 degrees caudal, entering the nasion.



A. Occipital bone - correct answer In the AP axial projection (Towne method)
of the skull, with the CR directed 30 degrees caudad to the orbitomeatal line (OML) and passing midway
between the external auditory meati, which of the following is best demonstrated?

A. Occipital bone

B. Frontal bone

C. Facial bones

D. Basal foramina



2 and 3 only - correct answer Which of the following are required for the AP
axial projection of L5-S1:

(1) 25* cephalic tilt for females

(2) Centering at the ASIS

(3) Support under the knees for comfort and reduction of pelvic tilt

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