Weingärtner's Magnetic Resonance Systems (Mars) Lab develops new MRI signal models and pulse sequences to non-invasively resolve the brain and heart microvasculature down to the capillary scale, using hydrogen nuclei as 'microscopic spies' on their surrounding tissue microstructure; the work is validated with in-vivo human studies (e.g., microvascular disease, cardiac imaging) and supported by an ERC Starting Grant. The lab is actively recruiting PhD students/postdocs to push quantitative MRI biomarkers into new disease areas.