Human heart (aortic valve) tissue displaying calcification

Density-dependent colour scanning electron micrograph of the surface of human heart (aortic valve) tissue displaying calcification in the form of spherical particles. Micrographs were coloured in post-processing by combining images acquired by two modes of image acquisition that use different kinds of electron microscope detector. Signals captured by the Backscatter electron detector (orange) and the Secondary electron detector (green) are shown here. Horizontal field width is 32 microns.