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The Equivalent Magnetizing Current (EMC) method for biplanar active and passive shim design
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lopez, Hector Sanchez Liu, Feng Trakic, Adnan Weber, Ewald Crozier, Stuart |
| Copyright Year | 2008 |
| Abstract | Synopsis: This paper presents a new method for biplanar active and passive shim design using an Equivalent Magnetizing Current (EMC) method. The EMC induced by the rotational component of the magnetization is equivalent to that of the stream function (SF) and hence the SF is proportional to the magnetization. Using this approach, the magnetic field generated by a magnetized disk of finite thickness is related directly to the SF and hence no intermediate step to transform the current density into SF is required. Optionally, instead of a current pattern, a set of iron pieces can be employed so that the magnetized shims can be placed at equally spaced contours of the magnetization-stream function (MSF). The MSF is expressed as a sum of orthogonal functions of the azimuthal angle and shim domain radius and so it is tailored in the source domain in order to generate a particular magnetic field harmonic or a combination of these inside the DSV. The method is validated using known examples and the potential to generate new solutions is demonstrated. |
| Starting Page | 343 |
| Ending Page | 343 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://cds.ismrm.org/ismrm-2008/files/00343.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
