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Radiotherapy: pre-treatment adjustments

Radiotherapy: pre-treatment adjustments

M705/0072

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Credit

TIM BEDDOW / SCIENCE PHOTO LIBRARY TIM BEDDOW / SCIENCE PHOTO LIBRARY

Caption

Radiotherapy: a radiographer (standing) adjusts the positioning of the radiation source prior to beginning treatment. Accurate delivery of the radiation beam is achieved by immobilising the head in a plastic face mask. Modern radiotherapy endeavours to deliver a radiation dose that is sufficient to destroy a tumour, yet cause minimal damage to surrounding healthy tissue. This is achieved by aiming a beam of limited radiation dosage from different directions during a number of sessions, so that the target receives a cumulative, effective dose. CT scans & computer simulations are employed in planning such treatment regimes.

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