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The 11.7-tesla Iseult MRI is a research scanner built to image the human brain at an exceptionally high magnetic field. The story began as INUMAC, a planned 11.75 T system described in 2013; the magnet reached its nominal field in 2019, the first human volunteer images were presented in 2024, and CEA reported first functional MRI images at 11.7 T in September 2026. These are research milestones—not evidence that the scanner is in routine clinical use or improves patient outcomes.
From the 2013 INUMAC plan to Iseult’s research milestones
Neil Savage’s 2013 IEEE Spectrum report described INUMAC, a project to build an 11.75 T whole-body MRI system. Its forecast was for magnet delivery and first images in 2014–2015. That schedule was not met: later CEA accounts refer to the system as Iseult and record the magnet reaching its nominal 11.7 T field on 18 July 2019.
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CEA says years of system testing and optimization followed. First volunteer studies began in late 2023 under a rigorous medical protocol, and CEA presented the first human brain images on 2 April 2024. The institution said those images came from 20 healthy volunteers and that the instrument was not yet in nominal operation at that time.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteOn 24 September 2026, CEA reported the first functional MRI images at 11.7 T. It characterized the work as demonstrating feasibility and reliability, not as a clinical validation or proof of improved diagnosis or treatment.
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What makes the magnet unusual
The field strength is central to the project’s appeal: stronger magnetic fields can support detailed brain research, but building a stable, usable MRI system at this scale is an engineering challenge. The 2013 account and CEA’s 2024 engineering update describe different stages and sets of figures; they should not be blended into one supposedly current specification.
The design described in 2013
IEEE Spectrum reported that the planned magnet would use niobium-titanium superconducting wire cooled with superfluid helium. Its account listed 170 kilometres of wire for the main coil and another 58 kilometres for two secondary shielding coils. The design included 170 double-pancake coils connected in series, a 90-centimetre bore, and a 22-centimetre-long high-resolution region. These are details of the project design as reported in 2013, not confirmation of the scanner’s present operating configuration.
The same article said the magnet was designed to carry 1,500 amperes at 12 T and be cooled to 1.8 K. It reported that niobium-tin had been considered but not selected because sources quoted in the article described it as more expensive and brittle. Those comparisons belong to the 2013 account, not a current assessment of superconducting materials or procurement.
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CEA’s later engineering account describes a magnet weighing 132 tonnes, measuring 5 metres in length and diameter, and having a 90-centimetre opening. It reports 182 kilometres of superconducting wire and 7,500 litres of superfluid helium. The wire totals differ from the 2013 article’s separate main-coil and shielding-coil figures; the two reports use different dated descriptions, so the numbers should be kept attributed to their sources.
What the first human images showed
CEA reported that some anatomical brain images took about four minutes to acquire, with 0.2 mm in-plane resolution and 1 mm depth. These values describe particular images in CEA’s April 2024 account; they are not a general scan-time promise or a complete specification for every examination.
CEA also compared those images with hospital MRI at 1.5 or 3 T, saying a theoretically similar result would take several hours on those systems. That is CEA’s comparison, not an independently established rule for all scanners, protocols, or patients.
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The study involved healthy volunteers and was conducted under a medical protocol. A first-in-human research milestone involving 20 volunteers does not by itself establish population-wide safety, suitability for patients, or clinical benefit.
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What the 2026 fMRI milestone adds—and what it does not
Functional MRI (fMRI) detects changes in brain signals associated with activity. CEA’s September 2026 report of first fMRI images at 11.7 T marks progress beyond anatomical imaging: the institution says the work demonstrates feasibility and reliability at that field strength.
CEA also describes technical obstacles to stable signals, including radiofrequency and static-field inhomogeneities, movement, and vibration. Its stated next research goal is to increase resolution at 11.7 T. The milestone does not establish routine clinical use, better diagnosis, treatment decisions, or improved patient outcomes.
How to read claims about the “most powerful” MRI
The title of the 2013 story reflected the project’s ambition and planned field strength. The later reporting establishes an 11.7 T nominal field and important research milestones, but the available accounts do not provide a current, comprehensive comparison with every other MRI research system. Field strength alone is not enough to judge imaging capability: bore size and field homogeneity, spatial and temporal resolution, acquisition time, signal stability, coils and gradients, participant safety protocol, and the kind of evidence behind a result all matter.
- Design target: a planned specification, such as the 11.75 T field in the 2013 account.
- Technical milestone: the magnet reaching its nominal 11.7 T field in 2019.
- Volunteer research: the anatomical images presented in 2024 from healthy volunteers.
- Feasibility research: the first reported 11.7 T fMRI images in 2026.
Keeping these categories separate prevents a striking engineering achievement from being mistaken for a validated medical service.
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