Pulsed field MRI system with spatial selection
Patent 5300887 Issued on April 5, 1994. Estimated Expiration Date: 
April 27, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 27, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMagnetic resonance imaging and spectroscopy methods Fringe field MRI Patent #: 5023554 InventorApplicationNo. 873998 filed on 04/27/1992US Classes:324/309, To obtain localized resonance within a sample324/307Using a nuclear resonance spectrometer systemExaminersPrimary: Arana, LouisInternational ClassG01V 003/00AbstractIn an MRI imaging system using a pulsed field to polarize the magnetic moments, a gradient field is applied prior to the collapse of the pulsed field. When the pulsed field turns off, the magnetic moments are spatially varying in the vicinity of the null plane of the gradient field. In one embodiment the gradient field is in quadrature with the pulsed field, enabling the imaging gradient coils to be used to provide an excited slab. In another embodiment the selection gradient field is parallel to the pulsed field and enables sharper slices by subtracting images acquired with different null planes.Field of SearchTo obtain localized resonance within a samplePARTICLE PRECESSION RESONANCE Using a nuclear resonance spectrometer system By scanning sample frequency spectrum With signal decoupling By spectrum storage and analysis Including polarizing magnetic field/radio frequency tuning With conditioning of transmitter signal | |
