A medical analysis method for estimating a motion vector field of the magnitude and direction of local motion of lung tissue of a subject is described. The evaporation region may be constructed of capillary paths that enable a capillary action which pulls solvent from the channel so as to enable a flow of solvent from the reservoir to the evaporation region through the channel. The method further includes fabricating indium gallium aluminum nitride -based LED multilayer structures on the mesas on the growth substrate, wherein a respective mesa supports a separate LED structure.