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Due to the nature of fMRI acquisition protocols, slices in the plane of acquisition are not acquired simultaneously or sequentially, and therefore are temporally misaligned with each other. Slice timing correction (STC) is a critical preprocessing step that corrects for this misalignment. STC is applied in all major software packages. To date, little effort has gone towards assessing the optimal method...
The quality of high-resolution Echo Planar images of the human brain has improved greatly in recent years, enabled by novel multi-channel receiver coil arrays and parallel imaging. However, in regions with local field inhomogeneity, EPI artifacts limit which parts of the brain can be imaged successfully. In this work, we present evidence that certain image artifacts can be attributed to nonlinear...
Functional MR Imaging (fMRI) is a widely used mechanism to non-invasively evaluate and assess neural activity in the brain, with echo planar imaging (EPI) the most common sequence used in fMRI studies. EPI methods are attractive because they provide functional imaging data of the whole brain at reasonable temporal resolutions. However, EPI is notoriously susceptible to multiple artifacts. This includes...
This paper deals with an analysis of techniques of interleaved Echo-Planar imaging (EPI) method for Functional Magnetic Resonance Imaging (fMRI). In order to have optimum echo time and consequently achieving low image distortion, an approach has been emphasized upon a technique that acquires six images, each with a different echo time, in a single shot. Also investigation has been initiated for the...
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