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Health·P Space·Evidence-backed problem·Published 2026-08-14

Identifying the presence of disc herniations in lumbar spine MRI using Gemini 3.1 Pro

Abstract: Purpose Lumbar disc herniation is associated with substantial morbidity, including low back pain, radicular leg pain (sciatica), sensory disturbance, and motor deficit. Magnetic resonance imaging (MRI) is central to confirming the diagnosis in symptomatic patients and to planning surgical or interventional management. Recent advances in artificial intelligence (AI) raise the possibility of automating aspects of image interpretation to improve consistency and reduce radiologist workload. This study evaluates a ge…

TRV-2026-0758Peer-reviewedPermanent record — cite & verify
Identifying the presence of disc herniations in lumbar spine MRI using Gemini 3.1 Pro

"File:Lumbar MRI t2-tse-rst-sagittal 06.jpg" by Stillwaterising is marked with CC0 1.0. To view the terms, visit https://creativecommons.org/publicdomain/zero/1.0/deed.en.

The quick read

Researchers tested Gemini 3.1 Pro in a zero-shot setting to detect lumbar disc herniations on sagittal MRI from 119 SPIDER cases (26% prevalence). Using only the mid-sagittal slice and a forced binary prompt, T1-only achieved 70% accuracy with 58% sensitivity and 74% specificity, while paired T1+T2 achieved 58% accuracy with 77% sensitivity and 51% specificity.

The findings matter because low specificity translates directly into unnecessary reviews and potential over-diagnosis in back-pain pathways, and the model fell below the ~80% specificity typically required for triage tools. Uncertainty remains about whether volumetric input, task-specific fine-tuning, or calibration could improve performance, as the current work was explicitly exploratory.

Main points
  • Evaluated Gemini 3.1 Pro zero-shot on 119 cases from SPIDER public multi-center dataset with 31 herniation-positive and 88 negative.
  • T1-only input yielded sensitivity 0.58, specificity 0.74, accuracy 0.70; T1+T2 yielded sensitivity 0.77, specificity 0.51, accuracy 0.58.
  • Adding T2 reduced accuracy significantly by exact McNemar p = 0.044, driven by near-doubling of false positives from 23 to 43.
  • Authors concluded model is not currently suitable as triage or screening aid due to specificity below clinical threshold.
Problem

When used zero-shot to identify lumbar disc herniations on sagittal MRI, Gemini 3.1 Pro produced low specificity and a substantial false-positive burden, with T1+T2 input performing worse than T1-only.

The rundown

The study used SPIDER, a public multi-center dataset of sagittal T1- and T2-weighted lumbar MRI from patients with low back pain with expert level-by-level labels, testing the same 119 cases under T1-only and paired T1+T2 conditions using a standardized binary prompt.

Performance was reported with 95% confidence intervals and paired accuracy compared via exact McNemar test, with a supplementary evaluation using 3-slice image stacks to test 3-D processing ability.

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