title: Focal irradiation and image fusion techniques (IGRT)--Part IV.
authors.forename: Cheng B
authors.initials: CB
authors.lastname: Saw
authors.forename: Henry
authors.initials: H
authors.lastname: Wagner
mesh_terms: D006801:Humans; D021621:Imaging, Three-Dimensional; D009369:Neoplasms / Q000532:radiotherapy*; D015641:Radiography, Interventional / Q000379:methods*; D011881:Radiotherapy, Computer-Assisted / Q000379:methods*; D014055:Tomography, Emission-Computed; D014057:Tomography, X-Ray Computed