Simultaneous phase-correction and denoising for diffusion-weighted MRI

Date
2016
Advisor
Instructor
Source Title
Proceedings of the IEEE 24th Signal Processing and Communications Applications Conference, SIU 2016
Print ISSN
Electronic ISSN
Publisher
IEEE
Volume
Issue
Pages
1313 - 1316
Language
Turkish
Type
Conference Paper
Journal Title
Journal ISSN
Volume Title
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.

Course
Other identifiers
Book Title
Keywords
Diffusion-weighted MRI, Non-local means filtering, Phase correction
Citation
Published Version (Please cite this version)