A maxillofacial CT scan can capture part of the brain in its images, but it is not designed to evaluate brain tissue and will not provide useful diagnostic information about it. The scan is optimized for facial bones, sinuses, and the jaw, and its field of view typically extends from the mandible up to the frontal sinus. That means the lower portions of the brain may appear in the images, but they won’t look the way they need to for a radiologist to assess them properly.
What a Maxillofacial CT Actually Covers
The standard field of view for a maxillofacial CT runs from the frontal sinus (the bony ridge above your eyebrows) down through the entire jaw, including the mandible. This captures the sinuses, eye sockets, cheekbones, nasal structures, and teeth. Because the top of this range sits just above the eyebrows, the lowest parts of the brain’s frontal lobes often appear in the scan’s upper slices.
But appearing in the image and being diagnostically useful are two different things. The scan settings are tuned for bone, not soft tissue. When a CT is set to a bone window, which is the default for maxillofacial imaging, fine details in softer structures like the brain are lost. Bone appears crisp and detailed, while brain tissue looks washed out and undifferentiated. You simply cannot detect bleeding, swelling, tumors, or other brain abnormalities from images optimized this way.
Why Brain Tissue Needs Its Own Scan
A dedicated head CT uses different settings than a maxillofacial CT. The voltage, radiation dose, and image processing are all adjusted to highlight the subtle density differences between types of brain tissue. This is what allows radiologists to spot things like blood clots, strokes, swelling, and masses. The field of view also extends from the base of the skull all the way to the top of the head, covering the entire brain rather than just whatever happens to be within the facial scan’s frame.
Slice thickness and reconstruction algorithms differ too. A maxillofacial scan prioritizes thin, sharp slices that reveal hairline fractures in small facial bones. A head CT uses reconstruction techniques specifically designed to differentiate gray matter from white matter and to reveal fluid collections. These are fundamentally different goals, and no single scan protocol can serve both equally well.
Incidental Findings Near the Brain
Even though a maxillofacial CT can’t properly evaluate the brain itself, it occasionally picks up findings in structures near or at the base of the brain. One retrospective study of full-volume cone beam CT scans (a type commonly used in oral and maxillofacial imaging) found that nearly 99.5% of patients had at least one incidental finding when anatomical variations were included.
Among the findings related to the area near the brain, researchers identified calcifications in the internal carotid artery in about 1.4% of scans and enlargement of the sella turcica (the bony pocket that houses the pituitary gland) in 0.3%. Calcified carotid artery plaques are considered clinically significant because they can signal elevated cardiovascular risk. These findings sit along bony borders and are visible precisely because the scan is optimized for bone. True soft tissue abnormalities inside the brain, however, remain invisible.
When Both Scans Are Ordered Together
In trauma settings, doctors frequently order a head CT and a maxillofacial CT as separate scans, each with its own protocol. The head CT comes first to rule out life-threatening intracranial injuries like bleeding or brain swelling. A maxillofacial CT is then added if there are signs suggesting facial fractures: a bony step-off you can feel through the skin, significant swelling or bruising around the eyes, misaligned bite, missing teeth, or a reduced level of consciousness.
Research from the University of Wisconsin developed screening criteria (known as the Wisconsin Criteria) to guide when a maxillofacial CT is warranted. The presence of any one of five physical exam findings puts a patient at high risk for facial fracture. Importantly, a 2017 analysis found that routine head CTs failed to identify facial fractures that needed surgery, reinforcing that neither scan can substitute for the other. The head CT misses facial detail, and the maxillofacial CT misses brain detail. They are complementary, not interchangeable.
What This Means if You’ve Had One
If you had a maxillofacial CT and are wondering whether your brain was checked, the practical answer is no. The scan may have captured a sliver of brain tissue in its images, but the settings were wrong to draw any meaningful conclusions about it. If you have symptoms that suggest a brain-related problem, such as persistent headaches, vision changes, confusion, or dizziness, you would need a separate head CT or an MRI, which is even more detailed for soft tissue evaluation.
Conversely, if you had a head CT after an injury and are wondering whether your facial bones were assessed, that scan also has limitations in the other direction. Head CTs regularly miss facial fractures that would be obvious on a maxillofacial scan. Each type of CT is a specialized tool built for a specific job, and the overlap between them is minimal in terms of diagnostic value.