systemHitachiOpen Extremity MRIfamily: airis

Hitachi Airis II 0.3T Open MRI

Family: Hitachi Airis · Modality: Open / Extremity MRI

Open-architecture 0.3T permanent-magnet MRI. Shipped broadly through the 2000s and early 2010s into community outpatient imaging, orthopedic, and chiropractic / specialty practice. Defining platform design: no cryogens (permanent-magnet rather than superconducting), no helium service burden, no quench risk, and an open C-arm geometry that addresses claustrophobia and bariatric populations at an operating-cost profile that conventional 1.5T cannot match. Image quality sits below 1.5T but is sufficient for MSK, routine brain, and some body imaging — the clinical positioning is explicitly non-tertiary.

Architecture

  • Permanent-magnet design — ferromagnetic permanent magnets provide the main field. No superconducting coil, no helium, no cryocooler, no quench pipe.
  • Open C-arm gantry — patient lies on a table between two magnet pole faces. Fully open access from three sides.
  • No cryogen service — fundamentally different operating economics vs superconducting MRI. No helium refills, no cold-head maintenance, no compressor.
  • Fixed magnet temperature — permanent-magnet field strength is temperature-dependent; room HVAC stability is important for field stability.

Platform highlights

  • 0.3T permanent-magnet field — positions Airis II between the lowest open-MRI tier (~0.2T) and the mid-field open scanners (Altaire 0.7T, Oasis 1.2T).
  • No cryogens — primary operating-economics advantage over superconducting MRI.
  • Open C-arm gantry with wide patient access — claustrophobic, bariatric, and pediatric-with-parent workflows supported.
  • Mechanical maintenance dominates the service profile — gradient chiller, RF amplifier, patient table, host computer. No helium / cryogen service.
  • Lower gradient performance than mid / high-field scanners — echo trains and bandwidth are constrained by the lower field strength.

Specs

  • 0.3 T permanent-magnet field
  • Open C-arm gantry
  • No cryogens (no helium, no quench pipe, no cold head)
  • syngo-equivalent Hitachi MR host
  • MSK / routine-brain / body-routine clinical scope

Clinical positioning

  • Orthopedic / MSK outpatient imaging — knee, shoulder, spine, wrist, ankle. The dominant use case.
  • Claustrophobic patients — open geometry is the primary selection criterion.
  • Bariatric patients — open access accommodates larger patients than most closed-bore scanners of the era.
  • Community outpatient imaging where operating-cost economics favor permanent-magnet over superconducting MRI.
  • Chiropractic and specialty-practice imaging — Airis II's operating-cost profile supports smaller clinical practices.

Market position (secondary / refurb)

  • Mature refurb market. Airis II is widely traded in the secondary market, especially in North American community and specialty practice.
  • Service ecosystem — Fujifilm OEM service under post-2021 Hitachi acquisition ownership; multi-vendor MR service organizations familiar with permanent-magnet service patterns.
  • Limitations in current market — lower field strength limits clinical scope vs 1.5T / 3T; wide-bore 1.5T platforms (MAGNETOM Aera, Signa Artist, Ingenia) and low-field sealed-bore (MAGNETOM Free.Max) have narrowed Airis II's clinical-economic niche.

Relationship to siblings

  • Hitachi Airis Elite / Airis Vento — higher-performance Airis open variants (System Cards planned).
  • Hitachi Oasis 1.2T — Hitachi's high-field open MRI; superconducting, not permanent-magnet, and clinically much more capable.
  • Hitachi Altaire 0.7T — predecessor-class mid-field open MRI (System Card planned).

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