| Autor: |
John R. Purcell, Bruce C. Breneman, Raymond E. Sarwinski |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
Magnetic Resonance Imaging. 9:VIII |
| ISSN: |
0730-725X |
| DOI: |
10.1016/0730-725x(91)90083-x |
| Popis: |
A magnetic resonance imaging magnet has a solenoidal superconducting winding producing a magnetic field and defining an examination region within a bore thereof. The examination region receives a body to be examined. The solenoidal superconducting winding generates a quasi-static magnetic field for aligning atomic nuclei in the body being examined. A two-fold or minimally symmetric ferromagnetic shield has a pair of magnetic flux return paths positioned on opposite sides of the solenoidal superconducting winding for reducing the magnetic field intensity in a region proximate to and outside of the solenoidal superconducting winding. A magnetic field inhomogeneity compensating system reduces magnetic field inhomogeneities introduced into the magnetic field within the examination region by the minimally symmetric ferromagnetic shield to provide a highly uniform quasi-static magnetic field within the examination region. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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