RecruitingPhase 2Radiation therapyA Study of Single Fraction Stereotactic Body Radiation Therapy (SBRT) Guided by Magnetic Resonance Imaging (MRI) in People With Liver Metastasis From Colorectal CancerThe researchers are doing this study to see if one session of high-dose contrast-enhanced MRI-guided SBRT (stereotactic body radiation therapy) is effective for colorectal cancer that has spread to the liver. The researchers will evaluate how well the study treatment can prevent the liver metastasis from growing and spreading. In addition, they will see whether it causes any side effects and whether there are any characteristics of the research MRI images that can predict response to treatment.