Chamber matrix system to measure high resolution star profiles of high-energy therapy beams in real-time for fields up to 40 cm x 40 cm

• Measures fields up to a size of 40 cm x 40 cm
• Measures high-resolution (3 mm) profiles alongthe principal axes and along the diagonals
• Checks the start-up behaviour
• Checks congruence between light field and radiation field

STARCHECK^maxi is a precise and reliable tool for fast measurements in radiation therapy beams. Typical applications are quality control and LINAC beam adjustment measurements with the detector panel embedded in a
solid state phantom. The ionization chambers feature an excellent relative response stability, avoiding the need of frequent recalibration.
A full set of 4 profiles is measured every 400 ms (or one profile every 100 ms), making the device useful for realtime measurements.
The excellent spatial resolution of only 3 mm ensures precise measurements even in penumbra regions. The scanning lengths covered by the detectors
are 40 cm along the principal axes and 56.5 cm along the diagonals.
Detectors on the field boundaries allow the congruence between light and radiation field to be checked.
The device is aligned visually to the light field, and the position of the radiation field is measured and compared with the expected ideal location.
Shifts of 1 mm or rotational deviations of 1° can be easily detected.
BeamAdjust software displays up to four profiles in realtime.
The profiles can b e analyzed according to selectable dosimetry protocols and the protocols of the accelerator manufacturers.
The software displays the start-up behaviour with a time resolution of 100 ms.