Combining phase images from array coils using a short echo time reference scan (COMPOSER)

Robinson, Simon Daniel, Dymerska, Barbara, Bogner, Wolfgang, Barth, Markus, Zaric, Olgica, Goluch, Sigrun, Grabner, Gunther, Deligianni, Xeni, Bieri, Oliver and Trattnig, Siegfried (2015) Combining phase images from array coils using a short echo time reference scan (COMPOSER). Magnetic Resonance in Medicine, 77 1: 318-327. doi:10.1002/mrm.26093

Author Robinson, Simon Daniel
Dymerska, Barbara
Bogner, Wolfgang
Barth, Markus
Zaric, Olgica
Goluch, Sigrun
Grabner, Gunther
Deligianni, Xeni
Bieri, Oliver
Trattnig, Siegfried
Title Combining phase images from array coils using a short echo time reference scan (COMPOSER)
Journal name Magnetic Resonance in Medicine   Check publisher's open access policy
ISSN 1522-2594
Publication date 2015-01-01
Year available 2015
Sub-type Article (original research)
DOI 10.1002/mrm.26093
Open Access Status DOI
Volume 77
Issue 1
Start page 318
End page 327
Total pages 10
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Collection year 2016
Language eng
Formatted abstract
Purpose: To develop a simple method for combining phase images from multichannel coils that does not require a reference coil and does not entail phase unwrapping, fitting or iterative procedures.

Theory and Methods: At very short echo time, the phase measured with each coil of an array approximates to the phase offset to which the image from that coil is subject. Subtracting this information from the phase of the scan of interest matches the phases from the coils, allowing them to be combined. The effectiveness of this approach is quantified in the brain, calf and breast with coils of diverse designs.

Results: The quality of phase matching between coil elements was close to 100% with all coils assessed even in regions of low signal. This method of phase combination was similar in effectiveness to the Roemer method (which needs a reference coil) and was superior to the rival reference-coil-free approaches tested.

Conclusion: The proposed approach—COMbining Phase data using a Short Echo-time Reference scan (COMPOSER)—is a simple and effective approach to reconstructing phase images from multichannel coils. It requires little additional scan time, is compatible with parallel imaging and is applicable to all coils, independent of configuration.
Keyword Phase combination
Phase imaging
Phased array coils
Ultra-high field
Parallel transmit
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
Centre for Advanced Imaging Publications
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