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      Simultaneous phase-correction and denoising for diffusion-weighted MRI

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      Author(s)
      Kafalı, Sevgi Gökçe
      Çukur, Tolga
      Sarıtaş, Emine Ülkü
      Date
      2016
      Source Title
      Proceedings of the IEEE 24th Signal Processing and Communications Applications Conference, SIU 2016
      Publisher
      IEEE
      Pages
      1313 - 1316
      Language
      Turkish
      Type
      Conference Paper
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      Abstract
      Diffusion-weighted imaging (DWI) suffers from low SNR when compared to regular MRI images. To attain reasonable SNR levels with high spatial resolution, multiple acquisitions of each slice have to be acquired. These repetitions are then averaged, with the goal of increasing the SNR. However, subject motion during diffusion-sensitizing gradients creates varying phases between repeated acquisitions. When direct complex averaging is performed, these phase offsets can cause unpredictable phase cancellations and local signal drops. Here, we propose a technique that simultaneously corrects phase and performs a non-local means filtering to reduce noise. The success of the proposed technique is demonstrated in vivo at 3T with DWI of the cervical spinal cord.
      Keywords
      Diffusion-weighted MRI
      Non-local means filtering
      Phase correction
      Permalink
      http://hdl.handle.net/11693/37700
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/SIU.2016.7495989
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • National Magnetic Resonance Research Center (UMRAM) 301
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