Disclosed are methods and apparatuses for generating
susceptibility-related contrast images, as induced, e.g., by marker
material interventional devices used for passive MR-guided interventions,
or by particles or cells loaded with marker materials used for molecular
imaging, cell-tracking or cell-labeling. Near a local magnetic field
perturber a positive contrast signal emanates from local gradient
compensation to form, e.g., a balanced SSFP type of echo, whereas
everywhere else echoes are shifted outside of the data acquisition
window.