US5228443A
Expired / Lapsed
US
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Method for estimation and display of current source distribution from electric and magnetic measurements and 3D anatomical data
Assignee: General Electric Co
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Filing: 1992-03-27
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Granted: 1993-07-20
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Expires: 2012-03-27
Abstract
Abstract A method for estimation and display of current source distribution within a living creature utilizes magnetic measurements taken outside of the living creature combined with 3D anatomical data generated from any procedure, such as MRI or CT scanning, which generates this type of anatomical data. The method is a modified minimum norm technique whereby the solution is limited to areas of the living creature where the electric source is expected.
Inventors
- 👤 Robert C. Tatar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:59
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/242
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A method for estimating and displaying a current source distribution in a living creature comprising the steps of: performing an MR scan of said living creature to obtain 3D anatomical data; segmenting said data into a quantity M, of tissue voxels; placing sensors at a quantity S, of locations with respect to said living creature for the purpose of obtaining magnetic field data; performing a sequence of single-dipole forward calculations on said segmented data to obtain a 3MxS matrix of calculated responses; computing a singular value decomposition on said matrix whereby a set of basis vectors representing a weighted sum of current sources is obtained; expressing said basis vectors as distributed current sources data over time; and displaying, using volume visualization techniques, said distributed sources data with said 3D anatomical data.
Claim 2
Independent Claim
131 words
A method for estimating and displaying a current source distribution in a living creature comprising the steps of: performing an MR scan of said living creature to obtain 3D anatomical data; segmenting said data into a quantity M, of tissue voxels; placing sensors at a quantity S, of locations with respect to said living creature for the purpose of obtaining magnetic field data; performing a sequence of single-dipole forward calculations on said segmented data to obtain a 3MxS matrix of calculated responses; computing a singular value decomposition on said matrix whereby a set of basis vectors representing a weighted sum of current sources is obtained; expressing said basis vectors as distributed current sources data over time; and displaying, using volume visualization techniques, said distributed sources data with said 3D anatomical data.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said segmenting step is performed manually using interactive graphical techniques.
Claim 4
Dependent Claim
29 words
The method of claim 1 wherein said segmenting step is performed automatically by choosing a range of parameter value from the MR data resulting from said MR scanning step.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |