TER Radioterapia Practice Questions - TER - Título De Especialista Em Radioterapia (Sociedade Brasileira De Radioterapia AMB) Exam

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Modern linear accelerators frequently offer Flattening Filter-Free (FFF) photon beam modes for stereotactic radiosurgery (SRS) and stereotactic body radiation therapy (SBRT). Compared to standard flattened beams of the same nominal energy, which physical characteristic is a key feature of an FFF beam?

Substantially higher dose delivery rate (up to 2 to 4 times higher) and lower out-of-field scatter/leakage dose A harder effective photon energy spectrum with significantly greater beam penetration at depth A completely flat, uniform lateral profile across large field sizes exceeding 30 x 30 cm Higher head scatter and increased neutron contamination at 10 MV

Correct Answer:

Substantially higher dose delivery rate (up to 2 to 4 times higher) and lower out-of-field scatter/leakage dose

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