Abstract
The images of MR angiography were constructed based on the change of intensity of MR signals (time-of flight technique) or the change in the phase of blood flow (phase-contrast technique). In this paper, we describe the principles of those imaging techniques. We also describe the basic principles of gradient-echo technique, a fast imaging technique used for MRA. FLASH, Spoiled-GRASS, GRASS, and FISP, which are representative imaging techniques using gradient-echo technique, were referred to for their sequences for imaging.
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