IC256-45 - 256 Strip QC Ion Chamber

The largest ionization chamber available. Ideal for beam position readback at isocenter. Sized to fit the entire scanning field without having to reposition. This unique feature enables operators to calibrate or validate beam positions in a scanning system without complex rigs that are prone to error.

The IC256-45 has already been used at the McLaren Proton Therapy Center to validate their pencil beam scanning system. If you are interested in trying out the system contact Pyramid's engineering and sales team to discuss your project's requirements. Rental systems are available for short-term trials and experiments.


  • Large 45 cm by 45 cm sensing area
  • Alignment marks on beam entrance window for accurate optical setup at isocenter
  • Can be imaged by X-ray patient imager for accurate alignment to patient coordinate system
  • Lightweight and robust
  • 256 1.75 mm strips in each axis
  • Robust carbon-fiber windows and precision photo-etched readout electrodes on thin FR4 substrates for low-scattering
  • High voltage sense loopback


  • Particle therapy spot position calibration
  • Particle therapy system commissioning
  • Particle therapy system QA
  • High energy ion beam diagnostics

Expertly Built

Electrodes patterned with unique laser technology. Assembled and tested by highly skilled technicians in our dedicated assembly facility.

  • Rigorously tested beyond normal operating range to ensure uniformity
  • Envirmonmental sensor measured against externally calibrated sources
  • Each ion chamber is fully retested after it has been opened
  • Real calibrated radioactive source is used as reference
  • Full test documentation can be provided for each individual instrument

Integrated Environment Sensors

Our ion chambers include integrated sensors for environmental corrections. No need for costly and inconvenient external instruments.

  • Humidity sensor
  • Temperature sensor
  • Pressure sesnor
  • Replacable desiccant

Thin-film Strip Detector

Strip detectors have a balance between accuracy on beam position and noise levels. Our strip detectors offer the highest resolution and lowest noise on the market.

  • Laser-machined polyimide electrode substrates
  • Absolute minimal beam scattering
  • Radiation hard
  • High geometric precision
  • Gold plated readout electrodes

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