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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Dorri, B. Vermilyea, M.E. Toffolo, W.E. |
| Copyright Year | 2002 |
| Abstract | An improved method for allowing a magnetic resonance (MR) magnet to meet its stringent field homogeneity requirements has been developed. The method is called passive shimming and involves the placement of pieces of ferromagnetic material in the magnet bore at locations which are determined from an initial field map. Software and hardware which facilitate this shimming procedure have been developed at GE and successfully implemented in MR scanners around the world. The software uses a linear programming algorithm to minimize the thicknesses of shims at each of a number of allowable locations which will bring the peak-to-peak field error in the volume of interest to its minimum level. The hardware consists of arc-shaped drawers on each of which shim packages may be built up to a predetermined maximum thickness. This shimming technology represents a major cost reduction from the superconducting or resistive electromagnetic correction coils which are typically used to shim a magnet's field.< |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 254 |
| Ending Page | 257 |
| Page Count | 4 |
| File Size | 457676 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 3 |
| Issue Number | 1 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1993-03-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Hardware Superconducting coils Superconducting magnets Magnetic resonance Magnetic materials Boring Linear programming Software algorithms Packaging Costs |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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