It is not. There are different methods of radiation therapy for the pituitary gland. Conventional (fractionated) radiotherapy is a small dose of radiation given daily for 4 to 5 weeks. Conformal radiotherapy is the focusing of radiation on the exact site of residual tumor, usually treated only once (e.g., gamma knife, linear gas pedal, proton beam). The decision of which radiotherapy to perform must be made by carefully reading the MRI to assess the size and location of the participating tumor. Large tumors near the optic cross (nerve of the eye) are not suitable for conformal radiotherapy because the intensity (radiation dose) of a single treatment can impair vision. Conformal radiotherapy is indicated for residual tumors that are small and not close to the optic chiasm.