a form of magnetic resonance imaging in which either the injection of a magnetic resonance contrast agent or the movement of the blood provides information of value in diagnosis MRA
noun 1. . noun 1. a noninvasive medical diagnostic technique in which the absorption and transmission of high-frequency radio waves are analysed as they irradiate the hydrogen atoms in water molecules and other tissue components placed in a strong magnetic field. This computerized analysis provides a powerful aid to the diagnosis and treatment planning of […]
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- Magnetic reversal
magnetic reversal A change in the Earth’s magnetic field resulting in the magnetic north being aligned with the geographic south, and the magnetic south being aligned with the geographic north. Also called geomagnetic reversal. Our Living Language : When magma rises to the Earth’s surface at a mid-ocean ridge, it flows out onto both sides […]
noun, Metallurgy. 1. roasting of a nonmagnetic ore to render it magnetic so that it can be separated from gangue by means of a magnetic field.