Uncertainty of target volume and organ at risk during fractional radiotherapy / 国际肿瘤学杂志

ABSTRACT

Anatomic structures and their relative position of the target and organs at risk surrounded will change more or less during fractional radiotherapy.These uncertainties will affect the practice of treatment planning correctly.The degree of these uncertainties can be investigated by imaging verification system during clinical practice.The possible reasons of these uncertainties may be tumor volume variations,organ motions orshape changes,patients weight or form changes and set-up errors.The development and practice of imageguided radiotherapy,dose guided radiotherapy and adaptive radiotherapy can offer rational approaches to over-come the uncertainties of the target and organ at risk surrounded during radiotherapy.