MRIdian: MRI-Guided Radiation Therapy

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One of the most recent technology advancements in Radiation Oncology is a unique combination of magnetic resonance imaging (MRI) and radiotherapy technologies.


With this MRI-guided radiation therapy, physicians have greater control over the daily radiation prescriptions because they are able to see the patient's internal anatomy and adapt to movements that may occur during the actual treatment delivery.


University of Wisconsin Hospital and Clinics is the second health care system in the world to host the MRIdian technology.


Who is a candidate for MRIdian?


Presently we are using this technology for complex cancer patients that have tumors that show active motion during the breathing cycle. Broadly speaking, these are tumors in the chest and abdomen.


What is the benefit of MRIdian?


The benefit of this technology is the ability to clearly see the tumor target and monitor more precisely where the daily radiation dose is being delivered. During treatment, the system monitors the patient's anatomy and adjusts for motion in real time, delivering the radiation dose only when the tumor is located exactly where it should be. If anatomic motion moves the tumor beyond the pre-defined area, the beam automatically stops, when the target moves back in, the treatment resumes.


While the patient is on the treatment table, this system can quickly compare the pretreatment MR image to the planning image and predict the dose to be delivered. With this information, clinicians can rapidly determine whether organ motion or other changes in the patient’s anatomy might result in suboptimal treatment. After consulting with the physician, the plan can be adapted to reoptimize the dose in several minutes.


With continuous MR imaging throughout each treatment, radiation delivery can be precisely adapted over a several week course of therapy to account for daily changes such as the patient losing weight, the tumor changing shape or shifts in the patient’s normal tissue anatomy.


Who is on the team of experts?


Together, our team of radiation oncologists works with a team medical physicists to implement the technical details for each patient during simulation, designing the treatment plans, and executing the technical aspects of each treatment necessary to meet the physician's written directive. In addition, our radiation technologists are skilled in both imaging and radiation treatment delivery. Lead by the Radiation Oncologist, this team of experts apply these novel MRI-guided radiation therapy treatments customized for each patient.


Video: Learn More About MRIdian