B-value calculation and correction using a linear segment gradient waveform model
US6670812B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2002 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Sep 13, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/5608
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A technique for calculating actual b-values in a diffusion weighted magnetic resonance imaging system and of adjusting the observed b-value until it is within a tolerance range of the prescribed b-value. A diffusion weighted image with the desired diffusion sensitivity may then be produced. Calculation of the actual b-value is accomplished by integrating the linear segments of the gradient waveform. Adjustment of observed b-value is accomplished by initially scaling the diffusion lobe amplitude and comparing a recalculated b-value to the prescribed b-value. Additional adjustment is provided by means of a numeric search iteratively performed until the recalculated b-value is within tolerance of the prescribed b-value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.