Method and system for magnetic resonance imaging
US4857847A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1987 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Sep 14, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/56
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The magnetic resonance (MR) imaging system, in which magnetic resonance is caused on the spin of a specific nucleus using a gradient field and a excitation pulse, and, through observation of an MR signal, an image representing the density distribution of that nucleus in a target region of a body is attained, provides at least one of a density distribution image of protons in water of the body and that of protons in the body's fat. First image data comprising complex image data representing the distribution of the spin in a water phantom and second image data comprising complex image data representing the spin distribution in the body are obtained. The first and second image data are acquired in the excitation sequence in which the phase of the MR signal for the water protons is opposite to that of the fat protons. By comparing the first and second image data, it is discriminated which one of the densities of water and fat protons in the second image data is dominant. Based on the discrimination result, the distortion component of the static field in the second image data is compensated for.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.