Reducing oblique flow effects in interleaved EPI with a centric reordering technique
| Autor: | Gabriele M. Beck, E. Mark Haacke, Lothar R. Schad, Tobias G. Noll, Debiao Li |
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| Rok vydání: | 2001 |
| Předmět: |
Acquisition Scheme
Echo-planar imaging Middle Cerebral Artery Echo-Planar Imaging Phantoms Imaging Plane (geometry) Computer science ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Phase error Oblique case Oblique flow Carotid Arteries Nuclear magnetic resonance Flow (mathematics) Encoding (memory) Humans Radiology Nuclear Medicine and imaging Artifacts Algorithm Magnetic Resonance Angiography |
| Zdroj: | Magnetic Resonance in Medicine. 45:623-629 |
| ISSN: | 1522-2594 0740-3194 |
| DOI: | 10.1002/mrm.1084 |
| Popis: | Segmented interleaved echo planar imaging offers a fast and efficient approach to magnetic resonance angiography. Unfortunately, this technique is particularly sensitive to oblique flow in the imaging plane. In this work, a mathematical analysis of oblique flow effects for several types of k-space coverage is presented. The conventional linear acquisition scheme, an alternating centric and a nonalternating centric encoding scheme are compared with respect to their flow properties. It is shown both by simulations and imaging experiments that artifacts from oblique in-plane flow are effectively reduced by both centric reordered phase-encoding schemes. The nonalternating centric acquisition scheme is preferred to the alternating centric scheme due to the smoother phase error transition in kspace in the presence of obliquely-angled flow. Magn Reson Med 45:623‐ 629, 2001. © 2001 Wiley-Liss, Inc. |
| Databáze: | OpenAIRE |
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