ViewRay MRIdian

Family: ViewRay MRIdian · Modality: MR-Linac

Integrated 0.35 T MRI-guided linac — MRI imaging throughout treatment delivery enables real-time soft-tissue visualization, automatic beam gating when the tumor moves out of the gate, and on-table adaptive replanning. Competitor to Elekta Unity (1.5 T) with the trade-off of lower field strength but no gradient-related geometric distortion concerns for dose calculation.

Variant-specific considerations

• 0.35 T split-magnet (low-field to minimize electron-return-effect and gradient-distortion concerns for dosimetry)
• 6 MV FFF linac mounted on rotating ring
• Real-time MRI imaging at ~4 frames/sec during delivery
• On-table plan adaptation (daily adaptive) is the primary selling point

Parts

0.35 T split magnet, gradient + RF chain, compact 6 MV FFF linac, ring gantry, MLC, adaptive planning workstation.

Related

• Elekta Unity (1.5 T MR-linac, competitor — card pending)
• SBRT