ABSTRACT
This chapter provides an overview of Radiochromic film (RCF) in small fields used in advanced radiation treatments such as stereotactic radiosurgery (SRS) and stereotactic body radiotherapy. Small fields are hallmarks of advanced radiation treatment such as SRS involving the delivery of a high radiation dose to the lesions within the brain as well as extracranial lesions. The dosimetry of very small X-ray fields is challenging for many reasons including lack of lateral electronic equilibrium, source occlusion, the size of detector in respect to the field size that leads to volume averaging effects and the non water equivalence of the particular detectors. RCF is one of the choices for dosimetry that has great potential for small-field dosimetry. RCF has been used more extensively for the determination of small field size relative output factors. A number of groups have used RCF for relative dosimetry measurements of percentage depth doses, Tissue maximum ratios, and off-axis profiles.
