Multi-energy X-ray images guide radiotherapy
An image-guided radiation therapy device is described by Accuray (Sunnyvale, CA) in international patent application WO/2013/058841. The apparatus includes a treatment delivery system that's configured to generate therapeutic radiation beams, plus a multi-energy X-ray imaging system and a system processor. The imaging system generates a first set of patient image data using radiation at one energy and a second set of images using radiation at a second energy. The two data sets are processed to generate an enhanced image of the patient and treatment delivery is directed based on information obtained from this enhanced image.