Abstract
1. Flattening Filter Free X-rays have been in clinical use for many years but mostly for small field sizes. 2. Flattening Filter Free X-rays have significantly shorter treatment time if is used for small field applications, such as: SBRT or SRS. 3. Because of the high dose rate (MU/minute), dosimetric properties of these FFF X-rays need to be carefully studied. Ion-recombination of ionization chambers is a concern. Beam data acquisition, beam modeling, and absolute dosimetry need to be done with great care, especially in small field applications. 4. Late toxicities of normal tissue may be a concern and need to be studied by organized clinical protocols.
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