Multi-Stripe/Plane Tagging

Abstract

The purpose of tagging experiments is to visualize the displacements by flow or movements during a preselected “time-of-flight.” The principle is to “tag” certain space regions by saturating the local spin populations at least partially, and to image the magnetization distribution after the time-of-flight with any fast NMR imaging method [17, 530]. The marker lines then appear in black superimposed on the image. Their contours are deformed according to coherent displacements of the nuclei reached in the time-of-flight. If the motions are of a more incoherent nature, the black contrast of the marker lines will fade relative to the contrast of the adjacent material. With two-dimensional imaging, the technique is referred to as “multi-stripe tagging” or “marker line” imaging. In context with three-dimensional image data one speaks of “multi-plane tagging.”