How to interpret these MRI images?

On these contrast MRI pictures, live fibroids typically look grey-white similar to the normal uterine tissue. This is how they are before the embolization. After embolization, they become small and turn into dark-black while the unaffected normal uterine ​tissue still looks grey-white. This typical appearance proves that the fibroids are dead and the embolization is successful. Note that only the 6 months follow up MRIs are included in these examples. The dead fibroids continue to shrink further for about 5 years and turn into small remnants.