What Does a Sinus CT Scan Show?

Short answer: A sinus CT scan shows the complete three-dimensional anatomy of your nasal cavity and sinuses — including whether sinuses are blocked, inflamed, or infected, whether a deviated septum or structural abnormality is contributing to your symptoms, and whether nasal polyps are present. It is information that nasal endoscopy alone cannot provide, and at the Sinus and Allergy Wellness Center of North Scottsdale, we review it with you directly — on the monitor, in the exam room, in real time. See. Understand. Resolve.

1. What Does a Sinus CT Scan Show?

A sinus CT scan is like the key piece of a puzzle that makes everything else fall into place. Once it goes in, the whole picture comes together quickly. It shows us the complete anatomy of your nasal cavity and all of your paranasal sinuses — the maxillary sinuses behind your cheekbones, the ethmoid sinuses between your eyes, the frontal sinuses above your eyebrows, and the sphenoid sinuses deep at the base of the skull.

Specifically, we are looking at whether the sinus drainage pathways are open or obstructed, whether there is mucosal thickening indicating inflammation, whether fluid or infection is present inside any sinus cavity, whether structural factors like a deviated septum or enlarged turbinates are narrowing the airway, and whether nasal polyps or other soft tissue changes are contributing to blockage. Every patient’s scan is different — and that is exactly the point. The CT scan tells us what is actually happening in your sinuses, not what we assume is happening based on symptoms alone.

2. Why Would I Need a CT Scan?

Even with nasal endoscopy — which lets us look directly inside the nose — we still cannot see inside the sinuses themselves. The nose can appear relatively normal on endoscopy while the sinuses harbor significant disease that only CT reveals. The reverse is also true — a nose that looks inflamed on endoscopy may have sinuses that are largely clear. Without the CT scan, we are making decisions with incomplete information.

There is a second reason the CT scan matters that most patients never hear: when we are considering obtaining a specimen for molecular diagnostic testing through MicroGenDX, the CT scan directs us to the exact sinus showing the most significant disease. That targeted approach increases the yield of the culture dramatically — meaning we are more likely to identify the organism driving the infection and less likely to miss it by sampling the wrong location.

3. Is a CT Scan Safe?

Yes — and our in-office CT system makes the safety answer even stronger. At SAWC we use the J. Morita cone beam CT scanner, which is one of the gold standard imaging systems used in ENT and maxillofacial imaging. Cone beam CT delivers significantly less radiation than conventional CT — typically 0.1 to 0.6 millisieverts depending on the field of view, compared to 0.6 to 1.0 millisieverts for a conventional sinus CT. The radiation dose from our unit is low enough that radiation engineers cleared the installation without requiring lead-lined walls or ceiling. That is not a common statement — and it tells you something meaningful about the dose involved.

The scan itself takes less than a minute. There is no injection, no contrast dye, and no claustrophobia concern. For patients with chronic sinus disease who may need imaging more than once over the course of their care, the cumulative dose remains well within accepted safety parameters.

4. How Much Radiation Is Used?

Our J. Morita cone beam CT delivers approximately 0.1 to 0.6 millisieverts of radiation depending on the field of view selected for your specific evaluation. For comparison, a cross-country flight exposes you to roughly 0.02 to 0.05 millisieverts of cosmic radiation. A conventional chest X-ray delivers approximately 0.1 millisieverts. A conventional sinus CT at a hospital or imaging center delivers 0.6 to 1.0 millisieverts.

Our cone beam technology produces high-resolution three-dimensional imaging of the nasal cavity, sinuses, and surrounding structures at a lower radiation dose than conventional CT. The diagnostic information it provides is exceptional — and the radiation exposure involved is among the lowest available for this type of imaging.

5. Can a CT Scan Show Why I Keep Getting Sinus Infections?

Yes — and this is one of the most important questions the CT scan can answer. Recurrent sinus infections are almost never random. There is almost always a structural or anatomical reason why certain sinuses are repeatedly affected. The CT scan shows us whether a drainage pathway is chronically narrowed, whether a structural variant is predisposing a particular sinus to obstruction, whether there is evidence of chronic mucosal disease that has never fully resolved between episodes, and whether chronic mucosal changes suggestive of persistent or biofilm-related infection are present.

For patients who have been through multiple antibiotic courses with only temporary relief, the CT scan is often the first time anyone has looked at the structural picture. What it reveals frequently explains everything.

6. Can a CT Scan Explain Why I Cannot Breathe Through My Nose?

Absolutely. Nasal obstruction has many potential drivers — a deviated nasal septum, inferior turbinate hypertrophy, swell body enlargement, nasal polyps, chronic mucosal edema from allergy or inflammation, or combinations of all of the above. The CT scan maps all of these simultaneously, showing us not just that obstruction is present but exactly where it is coming from and how significant each contributing factor is.

This matters because the treatment for a deviated septum is different from the treatment for turbinate hypertrophy, which is different from the treatment for nasal polyps. Knowing precisely what is driving the obstruction allows us to target the treatment rather than guess at it.

7. Will Insurance Cover My CT Scan?

In most cases, yes — when the scan is ordered for an appropriate clinical indication such as chronic sinusitis, recurrent acute sinusitis, nasal obstruction, or evaluation prior to a procedure. Coverage does vary by plan, and prior authorization may be required by some insurers. Our team reviews your insurance coverage before the scan is performed and discusses any expected out-of-pocket costs with you in advance. We respect your time and your finances — there are no surprises.

8. How Long Does a CT Scan Take?

The actual scan takes less than one minute. The total time from when you sit down at the scanner to when you return to the exam room is typically five to ten minutes. This includes positioning, the scan itself, and image reconstruction. There is no preparation required, no recovery time, and no restriction on activity afterward. You will be reviewing your results with us within minutes of the scan being completed.

9. Do I Need Special Preparation?

No special preparation is required for a standard sinus CT scan. You do not need to fast, stop medications, or do anything differently before your appointment. If you wear glasses or jewelry near the head and neck area, you will be asked to remove them briefly for the scan. That is the extent of the preparation involved.

10. What Happens After My CT Scan?

This is where SAWC is fundamentally different from the standard model of care. After your CT scan is completed, our staff returns you to your exam room. Your images are loaded on the monitor directly in front of you. We sit down together and we review them with you — not a radiologist’s report read to you by a provider who may or may not have seen the images themselves. You see what we see. We explain what we are looking at in plain language. We answer your questions. We ask you questions. And then we develop a plan together.

The standard model — order the CT at visit one, send the patient to an imaging center, schedule a second appointment to review the report, possibly refer to a third provider — means three visits, three missed blocks of time from work, more delay, and more uncertainty. We collapse that entire sequence into one appointment. That is our commitment to you.

11. Can a CT Scan Detect Nasal Polyps?

Yes. Nasal polyps — benign inflammatory growths that develop from the nasal and sinus mucosa — are clearly visible on CT imaging. The scan shows their location, their size, and how extensively they are affecting the sinus drainage pathways. This information is essential for treatment planning, as polyp disease often requires a different approach than sinusitis without polyps, and the extent of disease on CT is one of the factors that guides whether medical management alone or a procedural intervention is the appropriate next step.

12. Can a CT Scan Detect a Deviated Septum?

Yes — and in more detail than a physical examination alone. The CT scan shows the full length and contour of the nasal septum from the tip of the nose to the nasopharynx, including deviations that may not be fully appreciated on anterior rhinoscopy. It also shows whether the deviation is affecting the sinus drainage pathways or contributing to turbinate compensation on the opposite side — both of which are clinically important for treatment decisions. Most patients assume they have a deviated septum. The CT scan tells us whether it is actually contributing to their symptoms.

13. Will I Review the Images During My Visit?

Yes — always. Reviewing the CT scan with you is not optional at SAWC. It is the standard. You sit in front of the monitor. We go through the images together. We point out what we see. We explain what it means. We give you the chance to ask every question you have before we discuss treatment options. This is not how most ENT practices operate — but it is how we operate, because we believe that a patient who understands what is happening in their own sinuses is a better partner in their own care.

14. Can CT Imaging Help Determine Whether I Need a Procedure?

Yes — it is one of the primary tools we use to make that determination. The CT scan shows us whether sinus drainage pathways are obstructed in a way that would benefit from balloon sinuplasty, whether turbinate hypertrophy is severe enough to warrant reduction, whether polyp burden is significant enough to change the treatment approach, and whether the anatomy is suitable for in-office intervention under local anesthesia. It takes the guesswork out of the decision and replaces it with objective information. We do not recommend procedures based on symptoms alone. We recommend them based on what we can see.

15. Is CT Imaging Performed in the Office?

Yes. At the Sinus and Allergy Wellness Center of North Scottsdale, CT imaging is performed in-office using a J. Morita cone beam CT scanner — one of the gold standard systems used in ENT and maxillofacial imaging. It produces high-resolution three-dimensional images of the nasal cavity, sinuses, and surrounding structures at a radiation dose low enough that our installation was cleared by radiation engineers without requiring lead-lined walls or ceiling.

You do not need to drive to a separate imaging center, wait for a report, or schedule a follow-up appointment to discuss results. The scan is done here, reviewed here, and discussed here — on the same visit, in the same exam room, with the same provider who examined you. This is what we mean by respecting your time. And it is what we mean by See. Understand. Resolve.

Want to Understand More?

This post is part of the Understanding Your Symptoms series on the Airway & Sinus Wellness Review.

→ Why Antibiotics Keep Failing Your Sinus Infection

→ What Is MicroGenDX — and Why Does It Change How We Treat Sinus Infections?

→ Does Balloon Sinuplasty Actually Work?

→ Is It Possible to Have Sinusitis Without Symptoms of a Cold?

→ Airway & Sinus Wellness Review — Full Publication

This post is part of the Understanding Your Symptoms section of the Airway & Sinus Wellness Review.

About the Author

Dr. Franklyn R. Gergits, MBA, DO, FAOCO is a Board-Certified Otolaryngologist and Fellowship-Trained Otolaryngic Allergist with a Clinical Focus in Rhinology and Airway Disorders and over 30 years of clinical experience. He is the founder of the Sinus & Allergy Wellness Center of North Scottsdale, where he performs in-office balloon sinuplasty, turbinate reduction, NEUROMARK® posterior nasal nerve ablation, and Eustachian tube dilation under local anesthesia. He performed the first balloon sinuplasty in Pennsylvania and holds dual Entellus Centers of Excellence certifications. Dr. Gergits is the originator of the Posterior Sinonasal Syndrome (PSS) hypothesis — a clinical framework identifying pepsin-mediated posterior nasal mucosal injury as an upstream driver of chronic rhinosinusitis. Preprint available at Preprints.org (DOI: 10.20944/preprints202603.0858.v1). ORCID: 0009-0000-4893-6332.

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This content is for educational purposes only and does not constitute medical advice. If you have questions about whether a sinus CT scan is appropriate for your symptoms, consult with a qualified otolaryngologist for individualized evaluation and recommendations.