American Society of Radiologic Technologist (ASRT) Practice Exam

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On an axiolateral oblique projection of the temporomandibular joints (TMJs), how is the TMJ of interest projected relative to the other TMJ?

  1. Superiorly; posteriorly

  2. Inferiorly; posteriorly

  3. Superiorly; anteriorly

  4. Inferiorly; anteriorly

The correct answer is: Superiorly; posteriorly

In the axiolateral oblique projection of the temporomandibular joints, the joint of interest is positioned in such a way that it appears superiorly and posteriorly in relation to the contralateral TMJ. This projection is designed to visualize the TMJ without superimposing the opposite joint, allowing for a clear assessment of the joint of interest. The positioning technique typically involves a 15-degree rotation of the patient's head toward the side being examined and a 15-degree caudal angulation of the central ray. By placing the TMJ of interest superiorly and posteriorly, radiologists can effectively obtain clear images that distinguish the joint structure and any potential pathologies, such as degenerative joint diseases or other abnormalities. This orientation helps to avoid any overlap that might obscure diagnostic details.