Effect of windowing and zero‐filled reconstruction of MRI data on spatial resolution and acquisition strategy
書誌事項
- 公開日
- 2001-08-23
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1002/jmri.1183
- 公開者
- Wiley
この論文をさがす
説明
<jats:title>Abstract</jats:title><jats:p>Standard, MR spin‐warp sampling strategies acquire data on a rectangular k‐space grid. That method samples data from the “corners” of k‐space, i.e., data that lie in a region of k‐space outside of an ellipse just inscribed in the rectangular boundary. Illustrative calculations demonstrate that the data in the corners of k‐space contribute to the useful resolution only if an interpolation method such as a zero‐filled reconstruction is used. The consequences of this finding on data acquisition and data windowing strategies are discussed. A further implication of this result is that the spatial resolution of images reconstructed with zero‐filling (but without radial windowing) is expected to display angular dependence, even when the phase‐ and frequency‐encoded resolutions are identical. This hypothesis is experimentally verified with a slit geometry phantom. It is also observed that images reconstructed without zero‐filling do not display the angular dependence of spatial resolution predicted solely by the maximal k‐space extent of the raw data. The implications of these results for 3D contrast‐enhanced angiographic acquisitions with elliptical centric view ordering are explored with simulations. J. Magn. Reson. Imaging 2001;14:270–280. © 2001 Wiley‐Liss, Inc.</jats:p>
収録刊行物
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- Journal of Magnetic Resonance Imaging
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Journal of Magnetic Resonance Imaging 14 (3), 270-280, 2001-08-23
Wiley