<unk>  <unk>  is the process of frequent two and three-dimensional<unk> ng, during a course of<unk>  treatment, used to direct<unk>  therapy utilizing the<unk> ng coordinates of the actual<unk>  treatment plan. The patient is localized in the treatment room in the same position as planned from the reference<unk> ng dataset. Three-dimensional (3D)<unk>  would include localization of a cone-beam computed tomography (CBCT) dataset with the planning computed tomography (CT) dataset from planning for example. Two-dimensional (2D)<unk>  would include matching planar kilovoltage (kV) radiographs fluoroscopy or megavoltage (MV)<unk> s with digital reconstructed radiographs (DRRs) from the planning CT.
This process is distinct from the use of<unk> ng to delineate targets and organs in the planning process of<unk>  therapy.  However, there is clearly a connection between the<unk> ng processes as<unk>  relies directly on the<unk> ng modalities from planning as the reference coordinates for localizing the patient. The variety of<unk>  gathering hardware used in planning includes Computed Tomography(CT), Magnetic Resonance<unk> ng (MRI), and Positron Emission Tomography (PET) among others. Through advancements in<unk> ng technology, combined with a further understanding of human biology at the molecular level, the impact of<unk>  on radiotherapy treatment continues to evolve.
Image-guided radiation therapy
Unsealed source radiotherapy
External beam radiotherapy
Neoadjuvant chemotherapy
Neoadjuvant therapy
Rhabdomyosarcoma surgery
Radiosurgery
Adjuvant therapy