2D-Sensing Ionization Chambers

Jan 13, 2015 - Pixelated ionization chambers for proton therapy


Ionization chambers with pixel electrode patterns provide true two-dimensional beam profiles. Strip electrode chambers assume that the beam can be characterized by two orthogonal one-dimensional projections. However some beam behaviors such as inclined elliptical beams are not well-represented by the projections - a true two-dimensional imager provides more information.

Pyramid has introduced 2D imaging chambers for particle therapy isocenter diagnostic purposes (the PX-2) and for in-situ beam profile monitoring (the PX-3). The PX-2 is available in a telescope configuration that measures the position, shape, trajectory and divergence of a beam. The PX-3 provides one of the lowest possible water-equivalent thickness beam position monitors for the particle therapy market. Go to the beamline diagnostics section of the Products page for more details.



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Ion Chambers


The ionization chamber or ion chamber is conceptually the simplest of all gas-filled radiation detectors, and is widely used for the detection and measurement of ionizing radiation. It is the preferred device for proton therapy dose and beam position monitoring due to a combination of robustness, gain stability, very low material budget in the beam path and availability of large continuous sensing areas.

Pyramid offers a wide range of ionization chambers for proton and heavy ion therapy applications. Advanced electrode coating and patterning allows the creation of precise strip and pixel patterns for position readout. A wide range of sensitive areas and electrode gaps is provided to suit different system geometries and beam currents.


Proton Therapy


Proton therapy is well established for the treatment of localized cancer tumors, especially when there are vital organs close by. This healthy tissue sparing makes it the method of choice for maintaining quality of life and especially for treating children. The proton beam delivery is fast and painless.

Proton therapy centers worldwide use Pyramid sensors, electronics, and software. Pyramid offers products for complete systems, sub-systems, or components. For more information see our Pencil Beam Scanning Brochure