MRI has great clinical values to distinguish soft-tissues without contrast or radiation. By using the hybrid-modality information from MRI and PET, here we developed deep learning method to synthesize metabolic activity mapping from contrast-free multi-contrast MRI images. Trained on clinical datasets, we demonstrated the feasibility to estimate metabolic biomarker from contrast-free MRI and validated on both FDG-PET/MRI and Amyloid-PET/MRI in-vivo datasets. This technique can be used for more efficient, low-cost, multi-tracer functional imaging, exploring anatomy-function relationship, visualizing new bio-markers and improving the workflow for both MRI and PET/MRI.
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