A navigator based rigid body motion correction for magnetic Resonance imaging
| Autor: | Ullisch, Marcus Görge |
|---|---|
| Přispěvatelé: | Shah, Nadim Joni |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
MRT
Lissajous-Navigator Bewegungkorrektur Navigator Artefakt Mathematics::Geometric Topology Computer Science::Robotics Physik Bewegungsmessung Bildgebendes Verfahren NMR-Bildgebung Lissajous navigator magnetic resonance imaging ddc:530 Lissajousnavigator NMR-Tomographie Bilderzeugung Magnetresonanztomographie motion correction Motion Capturing MRI |
| Zdroj: | Aachen : Publikationsserver der RWTH Aachen University XX, 148 S. : Ill., graph. Darst. (2012). = Aachen, Techn. Hochsch., Diss., 2012 |
| Popis: | A novel three-dimensional navigator k-space trajectory for rigid body motion detection for Magnetic Resonance Imaging (MRI) – the Lissajous navigator – was developed and quantitatively compared to the existing spherical navigator trajectory [1]. The spherical navigator cannot sample the complete spherical surface due to slew rate limitations of the scanner hardware. By utilizing a two dimensional Lissajous figure which is projected onto the spherical surface, the Lissajous navigator overcomes this limitation. The complete sampling of the sphere consequently leads to rotation estimates with higher and more isotropic accuracy. Simulations and phantom measurements were performed for both navigators. Both simulations and measurements show a significantly higher overall accuracy of the Lissajous navigator and a higher isotropy of the rotation estimates. Measured under identical conditions with identical postprocessing, the measured mean absolute error of the rotation estimates for the Lissajous navigator was 38% lower (0.3°) than for the spherical navigator (0.5°). The maximum error of the Lissajous navigator was reduced by 48% relative to the spherical navigator. The Lissajous navigator delivers higher accuracy of rotation estimation and a higher degree of isotropy than the spherical navigator with no evident drawbacks; these are two decisive advantages, especially for high-resolution anatomical imaging. |
| Databáze: | OpenAIRE |
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