Echo planar diffusion-weighted imaging: possibilities and considerations with 12- and 32-channel head coils
John N Morelli, Megan R Saettele, Rajesh A Rangaswamy, Lan Vu, Clint M Gerdes, Wei Zhang, Fei Ai
Scott and White Hospital/Texas A&M HSC, University of Missouri ‑ Kansas City/St. Luke’s Hospital, USA, Tongji Hospital, Huazhong University of Science and Technology, Cancer Center of SUN YAT‑SEN University, Republic of China
Date of Submission: 30-Jan-2012, Date of Acceptance: 03-Apr-2012, Date of Web Publication: 23-May-2012.
Interest in clinical brain magnetic resonance imaging using 32-channel head coils for signal reception continues to increase. The present investigation assesses possibilities for improving diffusion-weighted image quality using a 32-channel in comparison to a conventional 12-channel coil. The utility of single-shot (ss) and an approach to readout-segmented (rs) echo planar imaging (EPI) are examined using both head coils. Substantial image quality improvements are found with rs-EPI. Imaging with a 32-channel head coil allows for implementation of greater parallel imaging acceleration factors or acquisition of scans at a higher resolution. Specifically, higher resolution imaging with rs-EPI can be achieved by increasing the number of readout segments without increasing echo-spacing or echo time to the degree necessary with ss-EPI - a factor resulting in increased susceptibility artifact and reduced signal-to-noise with the latter.
Keywords: 3 Tesla MRI, Diffusion-weighted Imaging, Echo Planar Imaging
Cited in 6 Documents
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