Which of the following describes the appropriate positioning of the cassette for lateral cervical X-ray?

The appropriate positioning of the cassette for a lateral cervical X-ray is crucial for obtaining a clear image of the cervical spine. When positioning the cassette, it should be positioned so that it captures the entire region being examined while ensuring the anatomy of interest is well-aligned within the X-ray field.

The correct answer involves placing the cassette in such a way that it adequately covers the area of interest without obstruction. Positioning the cassette adjacent to the patient's chest allows for proper alignment of the cervical spine and ensures that the X-ray will capture the necessary anatomical details. This positioning facilitates a clear projection of the cervical vertebrae, aligning with the natural curvature of the spine.

Other options do not align with optimal practice: centering the cassette on the thyroid cartilage would not adequately include the entire cervical area, especially in cases where the vertebrae extend above that point. Positioning outside the examination area overlooks the necessity for detailed imaging, while placing the cassette at the level of the lower lip might not provide enough coverage of the cervical spine. Therefore, positioning adjacent to the patient’s chest is essential for a comprehensive lateral view of the cervical region.