The voice of medical imaging and clinical oncology

CBCT

Cone beam CT-guided online adaptive radiotherapy

Online adaptive radiotherapy (oART) is becoming more commonplace, initially with MR-guided capabilities, and now with cone beam CT (CBCT)-guided adaptive machines across the UK. There are more than 100 Varian Ethos machines installed globally, which provide CBCT-guided capabilities. At Royal Surrey NHS Foundation Trust we are soon to have our second Ethos machine installed at […]

Dr Matthew Bolt, Rachel Hollingdale

Royal Surrey NHS Foundation Trust

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Online CBCT-based adaptive planning and treatment

Radiotherapy treatment plans are created to deliver a high dose to targets while sparing organs at risk (OAR). These are created on a planning CT scan, which may be taken weeks before the treatment starts. At each treatment, patients are imaged and matched, then the treatment couch is shifted so that the treatment plan is […]

Rachel Hollingdale, Dr Matthew Bolt, Dr Charlotte Shelley

Royal Surrey NHS Foundation Trust

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Measuring and explaining CBCT dose safety limits in radiotherapy: the Barts experience

Radiotherapy treatments typically deliver between 2Gy and 6Gy per day to treat patients with cancer. When dealing with such high radiation doses, safety and accuracy are paramount to ensure good patient outcomes. Over the last two decades, simple conformal treatments have been steadily discarded in favour of the more sculpted dose distributions available from intensity […]

Neda Shiravand, Dr Niall MacDougall

St Bartholomew's Hospital

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Adaptive radiotherapy

Radiotherapy is an important modality of cancer treatment. External beam radiotherapy (EBRT) is the most common form of radiotherapy, and it is estimated that 50% of all cancer patients will receive radiotherapy at some stage during their cancer journey. There have been major technical advances in EBRT in the past few decades. Accurate radiotherapy treatments […]

Fei Sun, Bashar Al-Qaisieh, Kevin Franks

St James's University Hospital

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Image guidance in radiotherapy

Imaging has been integral to radiotherapy for decades. However, it has been within the last 20 years that phrases such as ‘image guidance’ have become part of mainstream radiotherapy vocabulary, and the use of all available imaging modalities within radiotherapy more common. So what is meant by ‘image guidance in radiotherapy’? This was one of […]

Dr Ellen Donovan

The Royal Marsden NHS Foundation Trust

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Image-guided radiotherapy for prostate cancer using transperineal ultrasound

During a course of external beam radiotherapy the prostate gland moves both between radiotherapy fractions (interfractional motion) and during treatment (intrafractional motion). Some of this motion is related to changes in rectal and bladder filling, and movements are more marked in the antero-posterior direction as a result of rectal filling variability, compared to laterally and […]

Dr Serena Hilman, Petra Jacobs

Bristol Cancer Institute

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