Magnetic Resonance Imaging of Gases: A Single-Point Ramped Imaging withT1Enhancement (SPRITE) Study

Thermally Polarized 1H NMR Microimaging Studies of Liquid and Gas Flow in Monolithic Catalysts

“…The long T 1 times eliminate one of the advantages of some gas imaging, namely the possibility of using very short repetition times for rapid data averaging (12). The large value of T 2 time might be an asset for spectroscopic studies, but has little to contribute to the imaging modality, unless the center of k-space is imaged without any applied gradients, as in SPI and SPRITE techniques (16).…”

Does ak-space span limitation affect MRI resolution?

“…[3]. What matters for distortion is the explicit dependence of the image on the discretization interval ⌬k in k-space.…”

“…SЈ͑ x͒ ϭ T͑ x͒ ᮏ S͑ x͒ ϭ ͵ R T͑ x Ϫ xЈ͒S͑ xЈ͒dxЈ [3] where T(x) and S(x) are the Fourier transforms of t(k) and s(k). Therefore, in this continuous domain treatment, the k-space span limitation is described in image space by a point spread function T(x), which is the Fourier transform of Eq.…”

The interface between covulcanized rubber sheets by NMR imaging, scanning FTIR spectroscopy, and mechanical indentation mapping

“…But with these techniques only the tail of the relaxation signal can be observed, and typical measurement times are of the order of 10 to 30 min for 2D images. Better signal-tonoise ratios can be achieved by use of the SPRITE technique (single-point ramped imaging with T 1 enhancement) [15][16][17] , so that shorter measuring times become accessible. However, the technique is not standard on commercial spectrometers due to severe loads on the magnetic field gradients which need to be driven to achieve spatial resolution.…”