EPID characterisation for dosimetry over a wide range of photon energies
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The success of radiotherapy is largely down to increasingly complex treatments.
Just two decades ago, treatments involved large open radiation fields. However, modern radiotherapy consists of treatments such as highly conformal beam shaping techniques with tight target margins. Other improved delivery methods includ intensity-modulated radiation therapy (IMRT), which allows higher radiation doses to be focused to regions within the tumour while minimising the dose to surrounding normal critical structures. A further development is volumetric intensity modulated arc therapy (VMAT) which consists of single or multiple radiation beams that sweep in uninterrupted arcs via fast continuous gantry motion around the patient and speed up treatment delivery.
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