ALIGN & BALL TEST OBJECTS

The OTP-ALIGN and OTP-BALL test objects designed by  QUALIFORMED enable you to carry out several mechanical and geometrical analyses on radiotherapy treatment machines used in conjunction with high (MV) and low (KV) energy « portal » imagers.

The OTP-ALIGN test object is especially used together with « portal » imagers to determine the position of the mechanical rotation center of the treatment machine’s crosshair, the mechanical vertical play, pixel size and the source – imager distance of associated « portal » imagers ...

The OTP-BALL test object is especially used together with « portal » imagers to determine the position of the mechanical rotation center of the treatment machine’s collimator, the mechanical play in relation to the gantry rotation of the associated « portal » imagers, sagging of the leaf banks of multi-leaf collimators …

Analysis of the images of the OTP-ALIGN and OTP-BALL test objects is optimal (precise, automatic, quick) when used in conjunction with the QUALIMAGIQ software platform, complemented by the MOD-EPID+, MOD-FIELD and MOD-MLC-stat analysis modules.

The OTP-ALIGN and OTP-BALL test objects enable you to optimally fulfill all requirements of the French AFSSAPS decision dated 27/07/07 regulating Internal quality control of external radiation therapy installations : points 5.2.1, 5.2.2, 5.9.2, 5.9.3 and 5.9.4 of the annex.

OTP-ALIGN is made of a transparent acrylic plate 5 mm thick which contains:

• a square tungsten frame, 150 mm x 150 mm
• 5 tungsten balls, each 2 mm in diameter
• a crosshair engraved in black

OTP-BALL is made of a transparent acrylic plate 2 mm thick on which a crosshair is engraved in black. The base contains a tungsten ball 4 mm in diameter.