The ideal solution of a flexible universal phantom for dose measurement and verification in the Intensified Modulated Radiation Therapy (IMRT), which permits measurements with ionization chambers, films, TLD and other dosimeters.
In scientific cooperation with the University Clinic Hamburg-Eppendorf, we developed the EASY CUBE in the year 2002. The EASY CUBE is a cubic phantom, with which dose distributions can be exactly verified in IMRT and Stereotactic applications. The EASY CUBE serves a complete, fast and accurate dosimetric verification – on the one hand for measurements with high-energy photon radiation, on the other hand for measurements of CT.
Our development objective: to be able to accomplish measurements which are necessary in the context of quality assurance within complex irradiation techniques with only one phantom arranged as universally as possible. The EASY CUBE is particularly used for the quality assurance of modern IMRT treatment techniques.
In the context of quality assurance, phantoms must emulate human anatomy on the one hand and permit physical measurements with different dosimeters on the other hand. With the EASY CUBE we designed a phantom that can fulfill all these criteria.
The EASY CUBE consists of a cube with 18 cm edge length and a wall thickness of 1 cm, in which plates consisting of RW3, which exhibits attenuation behavior equivalent to water for therapeutic photon and electron radiation, can be stacked with a surface of 16 x 16 cm ². Thus a dose verification with films is simultaneously possible in up to 16 levels. For the verification of irradiation plans and temporally modulated irradiation fields detectors are, in connection with films, due to their high local dissolution, of special advantage – smooth and continuous pressure of the phantom plates to the films ensures that the films can be exactly assigned to the phantom position.
Resume The EASY CUBE is one of the most versatile phantoms. The following tasks can be fulfilled by development of extensions with only one phantom.
>> Dose measurements with:
- Ionization chambers
- Further procedures with the help of special adapters
>> Simulation of inhomogeneities:
- Bones / fat / musculature / lung
- Artifacts: e.g. metal
>> CT-quality assurance:
- Exemption from distortion of CT-pictures
- Calibration of the Hounsfield scale
>> Stereotactic quality assurance:
- Own Localizer