| Autor: |
Nguyen, Hien M., Sutton, Bradley P., Morrison Jr., Robert L., Do, Minh N. |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Medical Imaging; Mar2009, Vol. 28 Issue 3, p423-434, 12p, 4 Diagrams, 3 Graphs |
| Abstrakt: |
Magnetic resonance imaging (MRI) uses applied spatial variations in the magnetic field to encode spatial position. Therefore, nonuniformities in the main magnetic field can cause image distortions. In order to correct the image distortions, it is desirable to simultaneosly acquire data with a field map in registration. We propose a joint estimation (JE) framework with a fast, noniterative approach using harmonic retrieval (HR) methods, combined with a multi-echo echo-planar imaging (EPI) acquisition. The connection with HR establishes an elegant framework to solve the it problem through a sequence of 1-D HR problems in which efficient solutions are available. we also derive the condition on the smoothness of the field map in order for HR techniques to recover the image with high signal-to-noise ratio. Compared to other dynamic held mapping methods, this method is not constrained by the absolute level of the field inhomogeneity over the slice, but relies on a generous pixel-to-pixel smoothness. Moreover, this method can recover image, field map, and T2* map simultaneously. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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