SPIRAL-SPRITE: a rapid single point MRI technique for application to porous media

Magnetic resonance imaging characterization of intact smoked cigarettes

“…Tobacco leaf constituents with high molecular mobility have been observed directly in shredded tobacco by 1 H MAS NMR and by 13 C MAS NMR (i.e. without cross-polarization) [2].…”

“…For leaf constituents with limited molecular motion, e.g. substances like cellulose and other cell-wall polysaccharides, analytical spectroscopy requires methods developed especially for the NMR of solids, primarily 13 C CPMAS NMR [3]. Similarly, the use of 1 H MRI to map the immobile leaf constituents in tobacco filler inside cigarettes requires special 1 H pulse methods developed specifically for imaging solid materials.…”

“…Similarly, the use of 1 H MRI to map the immobile leaf constituents in tobacco filler inside cigarettes requires special 1 H pulse methods developed specifically for imaging solid materials. Single-point imaging (SPI) [4][5][6][7] and single-point ramped imaging with T 1 enhancement (SPRITE) [8][9][10][11][12][13] are two methods that meet this requirement [1].…”

Development of a 3-D, multi-nuclear continuous wave NMR imaging system

“…Nevertheless, some 3-D studies have been reported (for example, see [12,20]). The SPI/SPRITE technique, while perhaps the most successful technique to date from the point of view of its range of applications reported in the literature, is limited by equipment deadtime which imposes a lower limit on the shortest T 2 value which can be studied [21,22].…”

Continuous wave MRI of heterogeneous materials

“…STRAFI, an inherently 1-dimensional technique (although multidimensional imaging has been reported recently [19]), has been used to study porous media with a broad range of T 2 values [14,20,21], although it requires the use of specialised hardware and its heavily relaxation-weighted signal can be difficult to interpret [22]. Perhaps the most successful approach to date has used SPI/SPRITE techniques, with images of porous materials with T 2 * values as low as 50 μs reported in the literature [23][24][25].…”