Magnetic Resonance Imaging (MRI) used in routine clinical practice produces images designed for single use, to be looked at by individual human experts. Although a powerful tool, it lacks consistency when comparing images acquired on different scanners or at different times. MRI scanners are capable of producing  images known as quantitative MRI (qMRI), which can provide additional consistency and clinical specificity but these measures need metrological support. This project will develop test objects, procedures, analysis tools, and best practice guidance for various qMRI  techniques and demonstrate them in an international multi-site trial.