COMbining Phased array data using Offsets from a Short Echo-time Reference scan (COMPOSER)
Simon Daniel Robinson 1 , Wolfgang Bogner 1 , Barbara Dymerska 1 , Pedro Cardoso 1 , Gnther Grabner 1 , Xeni Deligianni 2 , Oliver Bieri 2 , and Siegfried Trattnig 1
High Field MR Centre, Department of
Biomedical Imaging and Image-guided Therapy, Medical
University of Vienna, Vienna, Vienna, Austria,
of Radiological Physics, Department of Radiology,
University of Basel Hospital, Basel, Switzerland
We present a phase-sensitive method for the combination
of data from array coils for which there is no volume
reference coil, such as PTx and some UHF receive arrays.
A very fast variable echo-time (vTE) reference scan with
a sub-millisecond TE is used to measure the complex
sensitivity of the array. Dividing high resolution,
T2*-weighted (e.g. SWI) data by the vTE scan matches the
phase of the array elements, allowing the complex
signals to be combined. This approach is fast, robust,
requires no phase unwrapping of phase and outperforms
the rival methods tested.
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