NMR Imaging with Varying Spatial Coupling.
Patent application filed, 10 Jan 92,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A method for obtaining a nuclear magnetic resonance image of a sample is performed by first placing the sample in a homogeneous static magnetic field excited with a homogenous transmitter device. spin magnetization in the sample is thus initially detected with an inhomogeneous receiver device such that an induced voltage in the receiver device depends on a spatial location of precessing nuclei in the sample. Then, a spatial coupling of the sample and the receiver device is varied and the spin magnetization in the sample is again detected with the inhomogeneous receiver device. The full spatial distribution of the spin density of the sample and hence an image of the sample is then determined with the spin magnetizations detected. Either the sample is moved relative to the receiver device, or the spatial coupling of the receiver device and the sample is electronically altered. Any spin interactions are eliminated by using coherent averaging techniques before the detecting steps. In addition, during the varying step, the spin magnetization is either left in the transverse plane stored along the static magnetic field direction allowed equilibrate along the static magnetic field direction or spin locked.
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy