American Society of Radiologic Technologist (ASRT) Practice Exam

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Which term describes the caudal angle of the central ray in the axiolateral oblique TMJ projection?

10 degrees
15 degrees
20 degrees
25 degrees

The correct answer is: 15 degrees

The term that describes the caudal angle of the central ray in the axiolateral oblique TMJ projection is 15 degrees. This positioning is essential to obtain optimal images of the temporomandibular joint (TMJ). The 15-degree angulation helps to open the joint space properly by directing the central ray downward and posteriorly. In this projection, the patient is typically positioned with the affected side closest to the image receptor, and the central ray is angled to ensure that the TMJ is visualized clearly. A correct angulation is crucial because improper angling could lead to distortion or superimposition of anatomical structures, reducing diagnostic clarity. Hence, a 15-degree caudal angle effectively highlights the joint space for clear imaging.