The purpose of the study is to conduct a comparison between BeadBlock™ and Embosphere in uterine fibroid embolization. Baseline and follow-up MR Imaging data will be made with respect to changes in fibroid and uterus perfusion and fibroid and uterine volume. This is a 12 months study (12 month follow up for all enrollees). The primary end-point will be the degree of fibroid devascularization as seen at contrast-enhanced MRI performed 3 months (+/- 15 days) after UAE procedure. In addition we will assess symptom reduction in patients that have undergone uterine fibroid embolization with Bead Block™ and Embosphere®.