At the end of the MRgFUS procedure, the patient is injected with gadolinium contrast agent and T1w post-contrast MRI scans are performed. These images are used to determine the NPV (Non-Perfused Volume) of the fibroid, which is the volume of tissue that is non-viable (has no blood flow to it). The NPV ratio of a fibroid is defined as the non-perfused tissue volume measured by the T1w post contrast scans, divided by the fibroid volume measured by the T2w images pre treatment.
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