Measures star profiles of high-energy
therapy beams in real-time
* Measures high-resolution profiles along the
principal axes and along the diagonals
* Measures congruence between light field and
* Checks positions of MLC leaves
STARCHECK 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 200 ms,
making the device useful for real-time measurements.
The excellent spatial resolution of only 3 mm ensures
precise measurements even in penumbra regions.
The scanning lengths covered by the detectors are
25.2 cm along the principal axes and 34.5 cm along
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 deviation of 1º can be easily
Two rows of detectors allow MLC leaf positions to
be verified. Up to 53 leaf pairs with a width of 5 mm
can be checked in one run. Deviations of (0.5 ... 1)
mm can be detected by STARCHECK.
The delivery includes the detector panel, an interface
box which connects to a PC via RS232 interface, and
data acquisition software.
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