title: Overview of image-guided radiation therapy.
abstract: Radiation therapy has gone through a series of revolutions in the last few decades and it is now possible to produce highly conformal radiation dose distribution by using techniques such as intensity-modulated radiation therapy (IMRT). The improved dose conformity and steep dose gradients have necessitated enhanced patient localization and beam targeting techniques for radiotherapy treatments. Components affecting the reproducibility of target position during and between subsequent fractions of radiation therapy include the displacement of internal organs between fractions and internal organ motion within a fraction. Image-guided radiation therapy (IGRT) uses advanced imaging technology to better define the tumor target and is the key to reducing and ultimately eliminating the uncertainties. The purpose of this article is to summarize recent advancements in IGRT and discussed various practical issues related to the implementation of the new imaging techniques available to radiation oncology community. We introduce various new IGRT concepts and approaches, and hope to provide the reader with a comprehensive understanding of the emerging clinical IGRT technologies. Some important research topics will also be addressed.
authors.affiliation: Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA 94305-5847, USA.
authors.forename: Lei
authors.initials: L
authors.lastname: Xing
authors.forename: Brian
authors.initials: B
authors.lastname: Thorndyke
authors.forename: Eduard
authors.initials: E
authors.lastname: Schreibmann
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Tian-Fang
authors.initials: TF
authors.lastname: Li
authors.forename: Gwe-Ya
authors.initials: GY
authors.lastname: Kim
authors.forename: Gary
authors.initials: G
authors.lastname: Luxton
authors.forename: Albert
authors.initials: A
authors.lastname: Koong
mesh_terms: D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D009369:Neoplasms / Q000532:radiotherapy*; D018787:Radiation Oncology / Q000379:methods; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*