A correction method for streak artifacts in gradient-echo EPI using spin-echo EPI reference data
- Authors
- Chung, Jun-Young; Han, Yeji; Cho, Zang-Hee; Park, HyunWook
- Issue Date
- Jun-2012
- Publisher
- SPRINGER
- Keywords
- Echo planar imaging (EPI); Streak artifacts; Nyquist ghost artifact; Gradient-echo EPI; Spin-echo EPI reference scan; Field inhomogeneity in high field MRI
- Citation
- MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE, v.25, no.3, pp.205 - 213
- Journal Title
- MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE
- Volume
- 25
- Number
- 3
- Start Page
- 205
- End Page
- 213
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/16341
- DOI
- 10.1007/s10334-011-0289-0
- ISSN
- 0968-5243
- Abstract
- To analyze the streak artifacts in a gradient-echo echo planar imaging (GE-EPI) sequence and to propose a correction method for the Nyquist ghost artifacts that does not cause streak artifacts in the GE-EPI imaging. Several GE-EPI imaging experiments with various reference scans, using both GE-EPI and SE-EPI scan data, were performed to analyze the streak artifacts and to investigate the spin dephasing phenomena of the GE-EPI reference scan. In addition, the analysis based on the spin dephasing was undertaken in order to demonstrate that the SE-EPI reference data can be used for the correction of the GE-EPI main scan data. The experimental results confirmed that the improvement of the reference data using either signal averaging or a large flip angle cannot guarantee perfect correction of the streak artifact if the noise is not completely removed. Due to the main field inhomogeneity, the spins of the GE-EPI reference data were dephased in multiple echo signals. The proposed correction method, which uses a SE-EPI reference scan for the GE-EPI images, eliminates the N/2 ghost artifacts without producing streak artifacts. It is believed that the proposed phase error correction scheme can improve the EPI performance in high field MRIs with higher magnetic field inhomogeneities.
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