CAMRT Radiography Practice Exam

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When performing a c-spine odontoid view, which reference line should be parallel to the central ray (CR)?

MSP
IOML
OML
AML

The correct answer is: IOML

In performing a c-spine odontoid view, the Intraoral Occlusal Plane (IOML) should be parallel to the central ray (CR). This positioning is critical because it helps to properly visualize the odontoid process (dens) located between the first and second cervical vertebrae. Aligning the IOML with the CR ensures that the image is taken at the correct angle, minimizing distortion and allowing for clearer diagnostic evaluation. The other reference lines have different roles in radiographic positioning. The Mid-Sagittal Plane (MSP) is important for ensuring that the patient's head is oriented correctly in relation to the body, while the Orbitomeatal Line (OML) and the Acanthiomeatal Line (AML) are typically used for other views, such as skull or facial imaging, rather than for the specific positioning required in the odontoid view. Thus, focusing on the IOML alignment facilitates the best visualization of the anatomical structures of interest in this particular projection.