Most people with tinnitus do not need a scan: European radiology recommendations reserve imaging for tinnitus that pulses, is one-sided or asymmetric, or comes with asymmetric hearing loss or neurological signs — and pulsatile tinnitus always needs it.
"Shouldn't I get a scan?" is one of the most common questions people have about tinnitus, and one of the most common sources of friction with clinicians. In 2025 the European Society of Head and Neck Radiology published practice recommendations that answer it specifically, and the answer turns on two questions: does it pulse, and is it one-sided?
The first rule: the examination decides the scan
Before anything else, the recommendations state that a detailed clinical assessment should always be performed before imaging is considered, because the characteristics of the tinnitus are what determine the diagnostic strategy.
That ordering matters, and it is worth understanding rather than resenting. An examination is not a gate standing in front of a scan. It is what determines which scan would be the right one — or whether a scan would be looking for something your symptoms give no reason to suspect.
If your tinnitus does not pulse
For non-pulsatile tinnitus — the steady ringing, hissing or buzzing most people have — the recommendations start from the observation that it usually has no structural cause.
MRI should be performed only where one of these applies:
- The tinnitus is unilateral or asymmetric
- It comes with focal neurological abnormalities
- There is asymmetric hearing loss
And the key point they state for that group: in patients with unilateral, non-pulsatile tinnitus, MRI should be performed to rule out retrocochlear disease.
"Retrocochlear" means behind the cochlea — on the hearing nerve or its pathway into the brain. The best-known example is an acoustic neuroma, a benign tumour on the hearing and balance nerve.
Why symmetry decides it, not severity
This is the part that feels arbitrary from the patient's side and is not.
The lesions imaging is looking for here are one-sided. A tumour sits on one nerve. So tinnitus arriving equally in both ears is a poor match for the thing the scan would be hunting — and a scan looking for something your symptoms give no reason to suspect mostly finds incidental things, such as a vascular loop beside the hearing nerve, that then need explaining away.
Loudness is not the criterion. Distress is not the criterion. Asymmetry is. Severe tinnitus in both ears does not meet the imaging threshold; mild tinnitus in one ear does. That is not a judgement about how much your tinnitus matters — it is a statement about what a picture of your head can and cannot show.
If you have been told you do not need a scan, and your tinnitus is in both ears, does not pulse, and your hearing is symmetric, that decision matches published recommendations. It is worth knowing that, because being told "we don't need to scan you" and being dismissed can feel identical from the inside, and they are different things. What being dismissed looks like is covered separately.
If your tinnitus pulses, the answer is different
Here the recommendations are unambiguous: imaging investigation is always required in the presence of pulsatile tinnitus.
The reasoning is that pulsatile tinnitus — the whooshing that keeps time with your heartbeat — is far more likely than the steady kind to have an identifiable cause, and that imaging is the way to find causes that are treatable and, in some cases, life-threatening.
That is the whole case for treating pulsing as a different symptom rather than a variant of the same one.
Which scan, and why the arterial–venous distinction matters
The recommendations set out how the choice is made:
- Temporal bone CT is the initial strategy where there are specific clinical features — a retrotympanic mass (something visible behind the eardrum) or conductive hearing loss.
- Most other patients require either CT or MRI with arterial and venous imaging — both circulations, not just one.
- Clinically categorising the tinnitus as "arterial" or "venous" beforehand guides where the radiologist looks, and helps in judging the significance of what turns up.
That last clause is more useful than it first appears. Venous variants are common and frequently incidental. Knowing in advance whether the sound behaves like an arterial or a venous one is what allows a radiologist to say whether a variant found on the scan is the cause or a coincidence — a distinction the article on sigmoid sinus wall abnormalities deals with at length, because a finding being present is not the same as it being responsible.
If a clinician can hear it too
For objective pulsatile tinnitus — audible to an examiner and not only to you — the bar rises again. Significant pathology such as a dural arteriovenous malformation must be excluded, which may require additional cross-sectional imaging beyond the first study. The site covers that specific finding under dural arteriovenous fistula, where the published resolution rates after treatment are among the highest in the field.
And the instruction that follows is the one worth carrying into an appointment: if the first imaging study does not reveal the suspected cause of objective pulsatile tinnitus, additional imaging investigations should be performed to exclude alternative diagnoses. A normal first scan is not the end of the pathway in that situation.
One thing that has changed: conventional angiography is now rarely indicated, having been largely superseded by cross-sectional imaging with arterial and venous phases.
CT or MRI first? There is no consensus, and the trend is toward MRI
Worth knowing that the choice of first scan is not settled. A 2025 review in the Journal of NeuroInterventional Surgery surveying the non-invasive imaging options states plainly that no consensus exists on the primary imaging modality for pulsatile tinnitus — CT, ultrasound and MRI are all in use — while noting that MRI is increasingly preferred as the first-line screening test, for its diagnostic performance and because it avoids the risks of invasive diagnostic angiography.
That sits alongside rather than against the European recommendations above, which route specific presentations — a retrotympanic mass, conductive hearing loss — to temporal bone CT first. The practical reading is that if you are offered one rather than the other, there is a real clinical rationale either way, and the question worth asking is not "why not the other one" but whether both arterial and venous phases are being covered.
A second guideline agrees
This is not one society's opinion. A Korean national clinical practice guideline published in 2026, developed by a multidisciplinary panel using GRADE and a Delphi process, recommends imaging for the evaluation of patients with pulsatile tinnitus or asymmetric hearing loss — Grade B.
Different countries, different panels, different methods, the same two triggers.
If you are having an MRI: the noise
MRI is loud, and for someone with tinnitus that is a reasonable thing to worry about before a scan. A 2015 study from a university hospital in Malaysia describes high acoustic noise as one of the unavoidable side effects of 3-tesla MRI, and was prompted by a case of hearing loss after a 3 T scan at that hospital.
Its researchers tested 35 patients having head and neck scans on a 3 T machine with pure-tone audiometry, including the high frequencies noise damages first, before and after the scan. Every patient wore foam earplugs, fitted following the safety guidelines for 3 T MRI, and the scans lasted about 28 minutes on average. No hearing threshold changed significantly at any frequency.
Two limits are worth keeping. It measured hearing thresholds, not tinnitus, so it does not say whether anyone's tinnitus was louder afterwards. And every patient was wearing earplugs, so the finding is about a scan with protection properly in place — which is the practical point. If you have tinnitus or sound sensitivity, make sure the earplugs or headphones you are given are fitted well before the scan starts, and say so if they are not.
What to take into an appointment
- If your tinnitus pulses in time with your heartbeat, imaging is indicated. Say that it pulses, explicitly, because it changes the pathway.
- If it is one-sided, or your hearing is worse on one side, that meets the criterion for MRI; tinnitus in one ear covers the common causes and how often those scans find anything.
- If you have neurological symptoms alongside it — numbness, weakness, visual changes, facial symptoms — say them in the same sentence as the tinnitus.
- If it is steady, in both ears, with symmetric hearing, the recommendation is not to image, and that is the recommendation rather than a shortcut.
- If a first scan for objective pulsatile tinnitus came back normal, the recommendations support further imaging rather than stopping.
- If your symptoms change when you turn your head, say so — positional triggers point at compression, which is the mechanism behind Eagle syndrome and changes what the radiologist is looking for.
- If a scan found something, ask whether the finding explains your symptom or merely accompanies it. Some findings are as common in people without pulsatile tinnitus as in people with it, which makes them a poor basis for a procedure.