Magnetic resonance imaging apparatus
US5329231A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1993 |
| Grant date | Jul 12, 1994 |
| Priority date | — |
| Expiry date | Apr 14, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/4838
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a presaturation period, a radio-frequency (RF) pulse for selectively tilting only spins outside an imaging region is applied while a slice selective gradient field Gs is applied, and a spoiler gradient field Gsp for saturating transverse magnetization outside the imaging region is subsequently applied to selectively presaturate the spins outside the imaging region. In a high-speed imaging period after the presaturation period, a sequence TR constituted by an operation of applying a very short rectangular non-selective excitation pulse RF for tilting spins in a slice by a predetermined angle, an operation of applying phase encoding and readout gradient fields Gp and Gr (without applying the slice selective gradient field Gs), and an operation of acquiring an MR signal is performed many times while the amplitude of the phase encoding gradient field Gp is changed, thereby acquiring a one-slice MR signal. In some cases, an operation of applying the spoiler gradient field Gsp is added after the operation of acquiring an MR signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.