FLASH imaging

Fig. 4.4.2 The discrete data points represent Taylor-Couette-Poiseuille flow regimes observed with MRI for r = 0.5 [41]. The curved boundaries were obtained for r = 0.77 with optical techniques [38]. The two inserts show MRI spin-tagging FLASH images of the SHV and PTV hydrodynamic modes.

The SHV flow regime has been studied systematically using the spin-echo and FLASH imaging sequences [39]. Figure 4.4.6 describes the steps for extracting... 

Neglecting T relaxation during the experiment, the total transverse magnetization is given by the sum of the amplitudes Mxo of the individual FID signals. For a snapshot-FLASH image of N lines, this is... 

The process is visualized by injection of Gd + chelate complexes like Gd(DTPA) as contrast agents on top of the column and using a FLASH sequence for rapid imaging. The unique insight into the separation process gained by NMR ima ng is illustrated in Figure 10.1.4 by a series of FLASH images [Bayl] a parabolic profile arises from faster elution in the core of the column. It is caused by a combination of wall absorption and thermal effects from a temperature distribution across the column diameter. The band... 

Fig. 24. Series of 2D FLASH images of hyperpolarized Xe ice, which is melting, migrating, and dissolving into the supercooled ethanol (top) or 80 vol% ethanol/water ice (bottom) phase. Within 2min all Xe polarization is concentrated on the bottom of the outer tube. By 10 min nearly all the Xe polarization is in the gas phase. (Courtesy of Wolfgang Hasing. Reprinted from ref. 328 with permission. Copyright 2004, Elsevier Inc.)...

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