Radiochromic 3D Detectors
This chapter focuses on the development and the state-of-the-art of a suite of full-three dimensional (3D) dosimetry techniques that can provide a more comprehensive solution to the problem of verification of complex radiation therapy (RT) treatments and 3D dose measurement in general. RT is a principle treatment modality for many cancers and other diseases. The vast majority of work to date has been performed with three classes of materials: polymer gels, radiochromic gels, and radiochromic plastics. Typical gel agents are water-based components like gelatin or agarose, while plastics have included polyurethane and silicone. The definition rules out semi-3D dosimetry systems as the Delta and the ArcCHECK, which have planes or surfaces of point detectors and interpolate measured doses to 3D. The term radiochromic indicates a material or substance that changes color when exposed to ionizing radiation. The sensitivity and stability of the radiochromic response in PRESAGE can vary depending on the specific constituents used and their relative concentrations.
