Description
Overview
The ONI MSK Extreme (also marketed as the GE Optima MR430s) bridges the gap between low-field open permanent MRIs and high-overhead whole-body systems. Built specifically for upper and lower extremities, it delivers true high-field 1.0T / 1.5T magnetic performance using a compact, lightweight active-shielded superconducting magnet weighing under $745\text{ lbs}$ ($339\text{ kg}$).
Instead of placing the whole body into a tunnel, the patient stays outside the scanner, resting in a cushioned, multi-position Ergo™ reclining chair with a moveable ottoman. The machine isolates the limb inside the magnet’s sweet spot, eliminating patient anxiety and giving orthopedic practices, sports medicine clinics, and radiology networks an efficient way to offload extremity exams from full-body MRIs.
Key Features & Advanced Technologies
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1.0T / 1.5T Superconducting Magnet: Offers high Signal-to-Noise Ratio (SNR) and image contrast for soft tissue, bone marrow, and cartilage. Uses low liquid helium capacity ($<60\text{ liters}$) with closed-loop refrigeration.
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Ultra-High Gradient System ($70\text{ mT/m}$): Features a $70\text{ mT/m}$ gradient amplitude and a $200\text{ T/m/s}$ slew rate—outperforming many full-body scanners to enable fast scan times and thin-slice $2\text{D}/3\text{D}$ sequences.
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6-Coil Iso-Centric RF Suite: Includes 6 cylindrical quadrature transmit/receive coils ($80\text{ mm}, 100\text{ mm}, 123\text{ mm}, 145\text{ mm}, 160\text{ mm},$ and $180\text{ mm}$) to fit everything from pediatric wrists to large adult knees tightly at the sweet spot.
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Ergo™ Reclining Patient Seating: Supports patients up to $350\text{ lbs}$ ($159\text{ kg}$) in an adjustable, free-floating chair, preventing motion artifacts and maximizing comfort during exams.
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Compact Suite Siting: Requires a minimum room footprint of $12\text{ ft} \times 17\text{ ft}$ ($3.7\text{ m} \times 5.2\text{ m}$), eliminating massive floor-reinforcement and facility remodeling costs.
Technical Specifications
| Parameter | Specification |
| Field Strength | $1.0\text{ T}$ or $1.5\text{ T}$ Active-Shielded Superconducting |
| Gradient Amplitude | $70\text{ mT/m}$ |
| Slew Rate | $200\text{ T/m/s}$ |
| Bore Opening | $285\text{ mm}$ (flared to $200\text{ mm}$ coil entrance) |
| Magnet Weight | $<745\text{ lbs}$ ($<339\text{ kg}$) |
| Helium Capacity | $<60\text{ liters}$ liquid helium |
| Patient Chair Capacity | $350\text{ lbs}$ ($159\text{ kg}$) |
| Field of View (FOV) | $4\text{ cm} – 16\text{ cm}$ (variable in $1\text{ mm}$ increments) |
| Slice Thickness | $2\text{D}: 2\text{ mm} – 10\text{ mm}$ / $3\text{D}: 0.5\text{ mm} – 10\text{ mm}$ |
| Suite Minimum Footprint | $12\text{ ft} \times 17\text{ ft}$ ($3.7\text{ m} \times 5.2\text{ m}$) |
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