Which anatomical structure should be included within the horizontal collimation for the oblique cervical view?

In the oblique cervical view, the primary anatomical structure that should be included within the horizontal collimation is the mid ear. This specific area is a critical marker when positioning for an oblique view, as it helps to ensure proper alignment and visualization of the cervical vertebrae. The mid ear acts as a reliable reference point to achieve the necessary angle for the image, allowing for better assessment of the cervical spine structures and soft tissue surrounding it.

Effective collimation is essential to minimize radiation exposure and improve image quality by reducing scatter radiation. Including the mid ear in the collimation assists radiologists and technicians in focusing on the relevant anatomy while avoiding unnecessary radiation to adjacent areas. Proper alignment with this landmark contributes to clearer and more diagnostic images, which is particularly valuable in assessing conditions affecting the cervical region.