Radiation Therapy
Precision Isocentric QC
Beam-Checker II
Model 37-731
For checks of:
•
Radiation and light-field
congruence
•
Collimator isocentricity
•
Collimator field-size accuracy
•
Gantry isocentricity
•
Table isocentricity
•
ODI accuracy
•
Isocenter rotational stability
•
Laser alignments
Specifications
Material
White and clear acrylics
Markers
Tungsten spheres; 2 mm Ø
Screen dimensions
12 x 12 in (30.5 x 30.5cm)
Overall dimensions
6 (w) x 18 (d) x 13 in (h)
(15.2 x 45.7 x 33 cm)
Weight
6.1 lb (2.7 kg)
Available model(s)
37-731
Precision Isocentric Beam-Checker II
This precision quality control tool is ideal for daily, weekly and monthly quality control
assessments of all mechanical and geometrical parameters of linear accelerators or
teletherapy units.
The Precision Isocentric Beam Checker II consists of a large opaque acrylic screen
backed by a secondary plate, both supported by two uprights. The screen is inscribed
with lines precisely defining the corners, edges and center of the screen’s 10 x 10 cm
and 20 x 20 cm fields. Intersecting center lines are inscribed with short lines spaced
1 cm apart. The screen can rotate about its axis in increments of 45°. Tungsten markers
of 2 mm in diameter are embedded in the center and corners of the fields.
A 10 x 12 inch ready-pack film can be sandwiched between the two plates. When exposed,
the tungsten markers project a sharp image on the film, thus eliminating the inaccuracy
and need to prick holes into the film.
The device’s acrylic base-plate has an attached bubble level and non-slip leveling legs
that allow it to be quickly and conveniently set up for use.
