Multi-dimensional spatial NMR excitation
US6541971B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 2001 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Jun 28, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/4833
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A main magnet assembly (12) creates a main magnetic field (Bo) through an imaging region (10). An operator selects sizes and locations of at least two intersecting slabs (72, 74) in a region of interest. A sequence controller (42) includes a gradient synthesizer (44) and an RF pulse synthesizer (46) that synthesize slab select gradient field pulses (80, 82) and magnetization tipping RF pulses (&agr;, &bgr;) to tip or rotate the magnetization in the slabs and an intersection region (70). A first RF pulse (&agr;) and slab select gradient tip the magnetization in the first slab and the intersection region out of alignment with the (Bo) field (FIGS. 5A, 7A). A second RF pulse (&bgr;) and slab select gradient tip the magnetization in the second slab out of alignment with the (Bo) field (FIG. 6B) and further manipulate the magnetization in the intersection region (FIG. 7B). Additional RF pulses (−&agr;, −&bgr;) and slab select gradients return the magnetization in the remainder of the first and second slabs into alignment with the (Bo) field (FIGS. 5D, 6D) while retaining the magnetization in the intersection region tipped out of alignment with the (Bo) field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.