STIR is an MRI technique that suppresses fat signal to make selected water-rich abnormalities more conspicuous. It is useful for detecting bone marrow or soft-tissue edema, but the sequence alone cannot determine the cause of the finding.
Meaning on imaging
STIR stands for “Short Tau Inversion Recovery”. The sequence uses a pulse that inverts longitudinal magnetization, followed by a timing interval selected to suppress the fat signal. Water-rich areas stand out more clearly against the suppressed background. In the spine, this can make abnormalities within bone marrow, ligaments and adjacent soft tissues easier to recognise during interpretation.
Indications and assessment
A radiologist may include STIR when investigating a recent fracture, an inflammatory response or selected soft-tissue injuries. It can also contribute to assessment of neural structures. Selection depends on the region, symptoms and complementary sequences needed, rather than ordering an isolated sequence as a separate diagnostic answer.
Limitations and interpretation
A bright focus on STIR does not identify one particular disease. Several processes can produce similar appearances. T1 imaging, tissue shape, clinical history and sometimes additional examinations help distinguish them. STIR is not the usual sequence for evaluating enhancement after gadolinium, because its signal suppression can complicate that assessment.
Role of TAGMED care
At TAGMED, reported edema requires clarification of its cause before mechanical loading of the region is proposed. Suspected fracture, infection or tumour warrants appropriate medical referral. A STIR bright area does not automatically justify a treatment device, and symptom relief would not establish that the underlying imaging finding has resolved.
Frequently asked questions
Is STIR an injected substance?
No. It is an acquisition sequence and does not itself require an injection.
Can it date a fracture exactly?
No. Edema can support recent activity but does not provide an exact injury date.
Does brightness mean infection?
Not by itself. Associated findings and the clinical context require assessment.
Why combine STIR with T1?
T1 shows other tissue characteristics and helps interpret the highlighted areas.
Must the bright area disappear?
Follow-up primarily addresses the identified cause, safety and the person's clinical progress.
Original conceptual diagram; no patient diagnostic image.
Medical references
- Eisenmenger et al., RadioGraphics / RSNA, 2023. Focused Abbreviated Survey MRI Protocols for Brain and Spine Imaging.
- AJNR, 2023. Deep Learning–Generated Synthetic MR Imaging STIR Spine Images Are Superior in Image Quality and Diagnostically Equivalent to Conventional STIR: A Multicenter, Multireader Trial.
- RadioGraphics / RSNA, 2021. Improving MR Image Quality in Patients with Metallic Implants.
References document the topic; their inclusion does not imply endorsement of TAGMED services by those organizations.
Educational information from The Spine Page. This entry does not replace an individual assessment. Documentary version: October 12, 2026. Sylvain Desforges, B.Sc., D.O., N.D., osteopath and naturopath.
TAGMED clinic contact details
For non-urgent consultations and information about available services.
Clinique TAGMED — Terrebonne
1150, rue Lévis, Suite 200
Terrebonne (Québec) J6W 5S6
450‑704‑4447
Clinique TAGMED — Montréal
1140, avenue Beaumont
Mont-Royal (Québec) H3P 3E5
1‑877‑672‑9060