What is image guided radiotherapy?
Image-guided radiotherapy (IGRT) is a technique which involves collecting images to verify a tumour’s position before external beam radiotherapy treatment is delivered. The purpose is to ensure the focus of the radiation is the tumour and a minimal amount to surrounding healthy tissue.
Understanding image-guided radiotherapy
The term IGRT covers a wide range of techniques and protocols which can vary significantly in how they are performed and the level of accuracy that is achieved.
Tumours move internally in different ways, depending on their location within the body and the surrounding organs. A tumour moving internally is natural, can be random and cannot be easily predicted. Additionally, in some circumstances, the size and shape of a tumour may change as it shrinks in response to the radiotherapy or other treatments that are happening at the same time, such as chemotherapy.
To ensure a tumour is targeted precisely, GenesisCare uses daily image-guided radiotherapy – every time radiotherapy is delivered. By using 3D volumetric cross-sectional scans, known as cone-beam CT scans, soft tissues can be defined and any positional changes to a tumour can be detected. 2D images only provide a match to hard bone structure and therefore cannot.
Research has shown that using daily image-guided radiotherapy when delivering radiotherapy is more effective and fewer side effects are experienced. Using IGRT in conjunction with intensity modulated radiotherapy (IMRT) further increases the effectiveness of treatment.
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