RecruitingRadiation therapyOAR-Based, Dose Escalated SBRT With Real Time Adaptive MRI Guidance for Liver MetastasesThe purpose of this trial is to identify a safe maximum tolerated dose level for MRI-guided Stereotactic Body Radiation Therapy (SBRT) treatment of bowel and liver metastases, respectively. Eligible participants will be on study for up to 12 months.