Department of Radiotherapy ❯ Our Techniques ❯ Adaptive Radiotherapy
During a course of radiotherapy, patients may lose appetite which results in weight loss. The contour of the patient may change accordingly as shown above: the violet line represents the planning contour and the yellow line represents the shape after three weeks of treatment. To solve this problem, adaptive tomotherapy takes into account the inter-fractional contour change and organ motions, which will systematically manage treatment feedback and allows us to respond to the temporal variations occurring between treatment fractions.
In lung cancer patients, weekly adjustment of tomotherapy plans may reduce the absolute volume of the ipsilateral lung receiving radiation by 17-23%. Results of radiobiological assessment of adaptive tomotherapy show a significant increase (↑13.2%) in the complication-free tumor control rate of treatment plans for lung cancer patients, indicating the clinical benefit of adaptive tomotherapy.
Verification scans are used for accurate patient setup and monitoring of tumour evolution. The image quality allows for verification of daily treatment delivery, enabling plan adaptation according to the tumour response. It can be used to quantitatively measure the tumour response during radiotherapy.
This technique provided by Radixact X9 TomoTherapy System®.