@darinlm1 X-ray guided radiation therapy (IGRT) and Intensity-Modulated Radiation Therapy (IMRT) are not competing technologies, but complementary approaches. IMRT shapes the precise dose of radiation to fit the tumor, while IGRT uses X-ray imaging during treatment to ensure the tumor is exactly in the targeted position.Intensity-Modulated Radiation Therapy (IMRT)What it is: An advanced, highly precise form of external radiation that uses computer-controlled X-ray accelerators to deliver customized radiation doses.How it works: The intensity of the radiation beam is varied—or modulated—to conform precisely to the three-dimensional shape of a tumor.The Benefit: It allows oncologists to deliver a highly lethal dose of radiation directly to the cancer while minimizing the exposure of surrounding healthy tissue and sensitive organs.X-Ray Guided Radiation (IGRT)What it is: Image-Guided Radiation Therapy uses imaging technologies (such as CT scans, X-rays, or cone-beam CT) immediately before or even during your radiation session.How it works: Because tumors and organs can shift slightly from day to day, IGRT takes real-time images to verify your exact positioning.The Benefit: It allows your treatment team to adjust the patient's position or the radiation beams on the fly. This ensures pinpoint accuracy, compensating for internal movement and protecting surrounding healthy tissue.

Basically, both are used in IMRT..from what I understand..whether you recieve proton or photon radiation. you will have slightly more radiation "splash" with photon but that can be useful when doing pelvic areas when not sure if cancer is present or not...the 'splash' knocks out small patches of cancer that may not have been seen by PETSCAN even