Interleaved variable density sampling with a constrained parallel imaging reconstruction for dynamic contrast-enhanced MR angiography
| Autor: | Jean H. Brittain, James H. Holmes, Scott B. Reeder, Frank R. Korosec, Jiang Du, Christopher J. François, Kang Wang, Reed F. Busse, Philip James Beatty |
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| Rok vydání: | 2011 |
| Předmět: |
Variable density
business.industry media_common.quotation_subject Mr angiography Sampling (statistics) law.invention Acceleration law Temporal resolution Computer graphics (images) Contrast (vision) Radiology Nuclear Medicine and imaging Cartesian coordinate system Computer vision Artificial intelligence Parallel imaging business media_common Mathematics |
| Zdroj: | Magnetic Resonance in Medicine. 66:428-436 |
| ISSN: | 0740-3194 |
| DOI: | 10.1002/mrm.22814 |
| Popis: | For MR applications such as contrast-enhanced MR angiography, it is desirable to achieve simultaneously high spatial and temporal resolution. The current clinical standard uses view-sharing methods combined with parallel imaging; however, this approach still provides limited spatial and temporal resolution. To improve on the clinical standard, we present an interleaved variable density (IVD) sampling method that pseudorandomly undersamples each individual frame of a 3D Cartesian ky–kz plane combined with parallel imaging acceleration. From this dataset, time-resolved images are reconstructed with a method that combines parallel imaging with a multiplicative constraint. Total acceleration factors on the order of 20 are achieved for contrast-enhanced MR angiography of the lower extremities, and improvements in temporal fidelity of the depiction of the contrast bolus passage are demonstrated relative to the clinical standard. Magn Reson Med, 2011. © 2011 Wiley-Liss, Inc. |
| Databáze: | OpenAIRE |
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