Magnetic field mapping around metal implants using an asymmetric spin-echo MRI sequence
| Autor: | Eva Gescheidtova, Z. Dokoupil, Karel Bartusek |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Physics of magnetic resonance imaging
Materials science Applied Mathematics Phase (waves) Quantitative susceptibility mapping equipment and supplies Magnetic susceptibility Magnetic field Nuclear magnetic resonance Distortion Spin echo human activities Instrumentation Engineering (miscellaneous) Phase modulation |
| Zdroj: | Measurement Science and Technology. 17:3293-3300 |
| ISSN: | 1361-6501 0957-0233 |
| Popis: | Magnetic susceptibility of materials that are used for body implants causes much distortion in MR images. This paper deals with mapping the magnetic field induction in the vicinity of these materials. A modified spin-echo method is used, in which via inserting a time interval of a defined length the range of phase modulation is reduced below the value 2π. Even with a large B0 inhomogeneity it is not necessary to unwrap the phase jumps. The method is suitable for studying the effects of body-implant materials on MR images and for measuring their magnetic susceptibility. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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