Radiotherapy physics
Radiotherapy physics supports accurate, safe cancer treatment. It is one of the clearest examples of physics directly affecting patient care.
Where the physicist fits
Radiotherapy departments rely on physicists for treatment planning support, machine quality assurance, dosimetry, commissioning, patient-specific checks, incident learning, service development and technical advice. The work is detailed because small errors in geometry, dose or equipment behaviour can matter.
A physicist may be involved before a patient starts treatment, while treatment is being planned, during routine machine checks, when new techniques are commissioned, or when a department investigates whether something happened as expected.
Treatment planning
Physics supports dose calculation, plan checking, patient-specific QA and decisions about how to deliver prescribed treatment safely.
Equipment QA
Linear accelerators and associated systems need regular checks so that dose, geometry, imaging and safety systems remain within tolerance.
Clinical teamwork
Physicists work with oncologists, dosimetrists, therapeutic radiographers, engineers and other scientists, so communication is part of the science.
How to prepare
Useful preparation includes understanding basic radiation interactions, dose, uncertainty, calibration, optimisation and the difference between a technically impressive plan and a clinically appropriate one. If you can explain why independent checks and QA culture are essential, you are thinking in the right direction.
Radiotherapy vs imaging physics
Source: IPEM medical physics overview.