In the past, doctors would draw the target area on the patient’s body surface manually with the help of imaging data, and the error is measured in centimeters; nowadays, by putting a tailor-made “fixed film” on the patient, and under the image fusion of CT and MRI, it finally realizes the three-dimensional precise strike on the tumor. Now, by putting a customized “fixed film” on the patient, with the fusion of CT and MRI images, the three-dimensional precision of the tumor can be achieved, which is like putting “3D glasses” on the radiotherapist. Ms. Ma, 27, lives in the United States. Last November, she couldn’t lift her left arm, and by this Spring, she couldn’t even move her left foot. She was diagnosed with a grade IV glioma in Beijing, which was inoperable due to the wide range of lesions. She and her family came all the way to Han to find the Cancer Center of Peking Union Medical College. Yang Kunyu, director of head and neck oncology department, made a plan for simultaneous radiotherapy. But who would have thought that difficulties would come one after another. Xiao Ma’s tumor could not be shown even on the enhanced CT pictures. Although the soft tissue image was clear in MRI alone, the spatial resolution was a little bit inferior. The experts immediately activated the new image fusion technology, which fused the CT and MRI images together to obtain a clearer image by taking the best of both. When fused, the pony’s diseased tissue was clearly displayed and the outline of the radiotherapy area became very simple. Over the past month, Xiao Ma has received several precise radiation treatments and his symptoms are in remission. Prof. Yang pointed out that this technique is the first time to be applied in the central and southern regions, and is currently only used for the treatment of head and neck tumors with an error range of 3 mm.