Which statement is true for both oblique and lateral cervical spine projections?

• A. The patient’s chin should be extended to prevent superimposition of the mandible over the upper vertebrae
• B. The MSP of the patient’s head is parallel with the IR
• C. The tube is angled 15-20 degrees cephalad
• D. A 72 inch SID should be used when erect images are obtained

Answer: (D)

Long source-to-image distance helps minimize magnification and distortion, which is crucial for accurate evaluation of the cervical spine in lateral and oblique views, especially when the patient is erect. A 72-inch SID for erect images reduces the apparent size of the vertebral bodies and prevertebral soft tissues, preserves the true relationships between cervical structures, and improves sharpness and detail across the area of interest. This setup also helps to minimize the magnified shoulders and other surrounding anatomy that can obscure the cervical vertebrae, making alignment and foraminal anatomy easier to assess.

Chin position is not a fixed requirement shared by both oblique and lateral views; the goal is to position the head to place the cervical anatomy in profile without unnecessary superimposition, and the exact chin adjustment may vary depending on the view and patient anatomy. Similarly, the midsagittal plane should be oriented so that the head is aligned with the image receptor to achieve a true lateral or oblique view; stating that the midsagittal plane should be parallel to the IR would not produce a true lateral or properly angled oblique. Finally, a fixed cephalad tube angle is not applicable for both views; the lateral cervical view is typically obtained with a horizontal central ray (no tilt) unless a specific adjustment is needed, and oblique angles are used only as needed to open the foramina.