[논문]Correction for Eddy Current-Induced Echo-Shifting Effect in Partial-Fourier Diffusion Tensor Imaging

Truong, Trong-Kha; Song, Allen W.; Chen, Nan-kuei

doi:10.1155/2015/185026

Correction for Eddy Current-Induced Echo-Shifting Effect in Partial-Fourier Diffusion Tensor Imaging 원문보기

BioMed research international, v.2015, 2015년, pp.185026 -

Truong, Trong-Kha (Brain Imaging and Analysis Center, Duke University Medical Center, 2424 Erwin Road No. 501, Durham, NC 27705, USA) , Song, Allen W. (Brain Imaging and Analysis Center, Duke University Medical Center, 2424 Erwin Road No. 501, Durham, NC 27705, USA) , Chen, Nan-kuei (Brain Imaging and Analysis Center, Duke University Medical Center, 2424 Erwin Road No. 501, Durham, NC 27705, USA)

Abstract ▼ AI-Helper

In most diffusion tensor imaging (DTI) studies, images are acquired with either a partial-Fourier or a parallel partial-Fourier echo-planar imaging (EPI) sequence, in order to shorten the echo time and increase the signal-to-noise ratio (SNR). However, eddy currents induced by the diffusion-sensitizing gradients can often lead to a shift of the echo in k-space, resulting in three distinct types of artifacts in partial-Fourier DTI. Here, we present an improved DTI acquisition and reconstruction scheme, capable of generating high-quality and high-SNR DTI data without eddy current-induced artifacts. This new scheme consists of three components, respectively, addressing the three distinct types of artifacts. First, a k-space energy-anchored DTI sequence is designed to recover eddy current-induced signal loss (i.e., Type 1 artifact). Second, a multischeme partial-Fourier reconstruction is used to eliminate artificial signal elevation (i.e., Type 2 artifact) associated with the conventional partial-Fourier reconstruction. Third, a signal intensity correction is applied to remove artificial signal modulations due to eddy current-induced erroneous T2∗-weighting (i.e., Type 3 artifact). These systematic improvements will greatly increase the consistency and accuracy of DTI measurements, expanding the utility of DTI in translational applications where quantitative robustness is much needed.

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Correction for Eddy Current-Induced Echo-Shifting Effect in Partial-Fourier Diffusion Tensor Imaging 원문보기

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