Image-guided radiotherapy (IGRT)

 

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.
 

Without IGRT the risk of part of the tumour being missed is increased. To account for this it is common practice to increase the area of tissue exposed to radiation when planning. This increase in planned margins, as well as the variability and movement of the tumour, can result in healthy organs or tissue receiving radiation, which increases the chance of unpleasant short and long-term side-effects.

Some providers only carry out image guidance at the start or perhaps once or twice during the weeks of treatment. Others may offer daily imaging but it may not be applied on the same day as the treatment session attended.

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.

Meet our doctors

Everything we do is focused on designing better care for our patients. With a network of 12 specialist oncology treatment centres across the UK, we provide the most up-to-date treatments and technology as standard.

We attract and retain some of the most experienced doctors in the country, who all have a passion for improving patient outcomes and specialise in the treatment of different types of cancer.

Meet our doctors

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Maidstone

17 Kings Hill Avenue, Kings Hill, West Malling, ME19 4UA

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Birmingham

Little Aston Hall Drive, Sutton Coldfield, B74 3BF

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Nottingham

The Park Centre for oncology, Sherwood Lodge Drive, Burntstump Country Park, Nottingham, NG5 8RX

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Portsmouth

Bartons Road, Havant, PO9 5NA

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Guildford

BMI St Martha Oncology Centre, 46 Harvey Road, Guildford, GU1 3LX

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Southampton

Spire Hospital, Chalybeate Close, Southampton, SO16 6UY

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Chelmsford

Springfield Cancer Centre, Lawn Lane, Chelmsford, CM1 7GU

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Elstree

Unit 710, Centennial Park, Centennial Avenue, Elstree, Borehamwood, WD6 3SZ

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Oxford

Sandy Lane West, Peters Way, Oxford, OX4 6LB

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Milton Keynes

Sunrise Parkway, Linford Wood East, Milton Keynes, MK14 6LS

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Newmarket

The Oaks, Fordham Road, Newmarket, CB8 7XN

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Windsor

69 Alma Road, Windsor, SL4 3HD

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