Method for simultaneously obtaining three-dimensional NMR angiograms and stationary tissue NMR images
US4918386A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Dec 23, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/56316
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for simultaneously obtaining a three-dimensional nuclear magnetic resonance (NMR) angiographic image of moving spins associated with fluid flow in a region of a living organism sample, and a three-dimensional NMR image of stationary tissue in the same sample region, by immersing the sample in a main static magnetic field; nutating, in an excitation subsequence of each of a plurality of NMR sequences, the nuclear spins and the generating a flow-encoding magnetic field gradient selected to cause a resulting NMR response echo signal from the spin of a moving nucleus to be different from the NMR response echo signal from the spin of a substantially stationary nucleus. The acquired response data is processed to provide at least one of (1) a difference data set from which response data obtained from stationary nuclei has been substantially removed, (2) a summation data set from which response data obtained from moving nuclei has been substantially removed, and (3) a set of phase data indicating direction of flow for flow amplitudes obtained in set (1), in order to generate both an angiographic image lying in a selected plane in a three-dimensional volume, and an image of station…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.