title: Defining the radiation target on a daily basis.
abstract: The delineation of the target volume for irradiation is a critical step in the radiotherapy process. Delivery of radiotherapy occurs over a fractionated course of many treatments. Variations in the position of the target volume may occur on a daily basis during treatment and so the procedure for defining the target volume on a single initial 'snapshot' computed tomography scan has been re-evaluated. Newer technologies of image-guided radiotherapy allow the development of on-line daily definition of the target volume prior to radiotherapy delivery.
authors.affiliation: Department of Clinical Oncology, Guy's and St Thomas' NHS Foundation Trust, London, UK.
authors.forename: H J
authors.initials: HJ
authors.lastname: Dobbs
mesh_terms: D019583:Dose Fractionation, Radiation; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008175:Lung Neoplasms / Q000532:radiotherapy; D008297:Male; D009038:Motion; D011471:Prostatic Neoplasms / Q000532:radiotherapy; D011857:Radiographic Image Interpretation, Computer-Assisted; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted; D020266:Radiotherapy, Conformal; D014057:Tomography, X-Ray Computed; D001749:Urinary Bladder Neoplasms / Q000532:radiotherapy