Dymerska, Barbara; Poser, Benedikt; Barth, Markus; Trattnig, Siegfried; Robinson, Simon Daniel; (2016) Dynamic distortion correction with standard single-echo EPI: development of the method for multi-channel coils at 7T and accuracy in the presence of substantial motion. Presented at: SMRT 24th Annual Meeting, Toronto, Canada.

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Abstract

Phase information is used in neuroimaging in phase-contrast angiography, Susceptibility-Weighted Imaging (SWI) [1], susceptibility mapping [2] and to depict iron accumulation in neurodegenerative disorders. Phase imaging benefits from strong susceptibility effects at very high field and the high SNR afforded by multi-channel coils. Combining the phase information from coil arrays is not trivial, however. The phase in each coil comprises both local field effects (the source of interesting contrast) and an offset which needs to be removed in order to be able to combine complex coil data. This has been done by referencing individual coil sensitivities to that of a volume coil [3], but alternative approaches are required for PTx coils and some ultra-high field arrays for which no reference coil is available. One possibility is to calculate the offsets from a multi-echo acquisition (MCPC-3D) [4], although this requires phase data to be unwrapped, which is time consuming and prone to error. We present a new method which uses a reference scan acquired at an echo time which is sufficiently short that approximates to the complex coil sensitivity (the phase part of which is the offset). We call this approach COMbining Phased array data using Offsets from a Short Echo-time Reference, or COMPOSER.

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