The invention concerns a method to extract a diffusion direction from DW-MR signals, in which a magnetic held gradient qi is applied to a body part, a magnetic resonance signal Si is measured and a diffusion direction \u03bcj is determined. A supply line fluidly connects the compressor, the reservoir, and the destination. The first and the second layer bridge elements each forms a -shaped cross-section and has two piers and a beam. The sensor is compatible with and pre-processes the physical quantity from the target and provides data to the computer.