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The phase-contrast technique uses phase-contrast imaging. "Phase-contrast imaging, or more casually High Resolution (HR) imaging, is a method of imaging in Transmission Electron Microscopy (TEM). The ability to image using phase contrast is one of the key elements which differentiates Transmission Electron Microscopy from conventional optical (light) microscopy. This ability arises from the fact that the atoms in a material diffract electrons as the electrons pass through them (the relative phases of the electrons change upon transmission through the sample), causing diffraction contrast in addition to the already present contrast in the transmitted beam. Phase-contrast imaging is the highest resolution imaging technique ever developed, and can allow for resolutions of less than one angstrom (less than 0.1 nanometres). It thus enables the direct viewing of columns of atoms in a crystalline material." source: http://en.wikipedia.org/wiki/Phase-contrast_method

MRI Phase Contrast technique

phase-contrast techniques

MRI Phase Contrast techniques

MRI Phase Contrast