Method for visualization of in-plane fluid flow by proton NMR imaging
US4570119A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1983 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Nov 15, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P5/001
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for visualizing in-plane flow utilizing an NMR pulse sequence to produce a plurality of odd and even spin-echo signals occurring respectively at echo delay times, T.sub.E, of 2.tau., 6.tau., 10.tau., etc., and 4.tau., 8.tau., 12.tau., etc. In the preferred embodiment, a fictitious spin-echo amplitude is calculated from the odd and even spin-echo signals at an echo delay time T.sub.E =0, for example. The calculated values for the odd spin-echo signals are lower than those calculated for the even spin-echo signals due to incomplete rephasing of the odd spin-echo signals in the presence of a read-out magnetic field gradient and flow. Subtraction of the calculated image pixel value of the odd spin-echo signals from the calculated pixel values of the even spin-echo signals results in a difference image which highlights the flowing nuclear spins. The image pixels due to stationary nuclear spins experience exact cancellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.