Method and system for NMR using adiabatic RF pulses producing spatially quadratic phase
US6650116B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2001 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | Sep 24, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/483
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and system for performing MRI and NMR spectroscopy that improves the dynamic range of the received signal by using adiabatic RF pulses for spin excitation rather than for spin inversion. The preferred adiabatic RF excitation produces a spatially varying phase across the slab, and a sharp slab profile. The phase variation is divided up by a phase-encoding gradient into voxels having a phase variation that is negligible over the width of the voxel. The phase variation in the slab-select direction is, on the whole, large enough that the peak amplitude of the received signal is reduced and the signal width broadened. This reduces the dynamic range required of the analog to digital converter used in a NMR system. A NMR system suitable for carrying out the methods of the invention is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.