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A radial sampling strategy for uniform k-space coverage with retrospective respiratory gating in 3D ultrashort-echo-time lung imaging

Title
A radial sampling strategy for uniform k-space coverage with retrospective respiratory gating in 3D ultrashort-echo-time lung imaging
Authors
Park, JinilShin, TaehoonYoon, Soon HoGoo, Jin MoPark, Jang-Yeon
Ewha Authors
신태훈
Issue Date
2016
Journal Title
NMR IN BIOMEDICINE
ISSN
0952-3480JCR Link

1099-1492JCR Link
Citation
NMR IN BIOMEDICINE vol. 29, no. 5, pp. 576 - 587
Keywords
3D radial UTE imaginglung MRIretrospective respiratory gatingk-space sample uniformity
Publisher
WILEY-BLACKWELL
Indexed
SCI; SCIE; SCOPUS WOS
Document Type
Article
Abstract
The purpose of this work was to develop a 3D radial-sampling strategy which maintains uniform k-space sample density after retrospective respiratory gating, and demonstrate its feasibility in free-breathing ultrashort-echo-time lung MRI. A multi-shot, interleaved 3D radial sampling function was designed by segmenting a single-shot trajectory of projection views such that each interleaf samples k-space in an incoherent fashion. An optimal segmentation factor for the interleaved acquisition was derived based on an approximate model of respiratory patterns such that radial interleaves are evenly accepted during the retrospective gating. The optimality of the proposed sampling scheme was tested by numerical simulations and phantom experiments using human respiratory waveforms. Retrospectively, respiratory-gated, free-breathing lung MRI with the proposed sampling strategy was performed in healthy subjects. The simulation yielded the most uniform k-space sample density with the optimal segmentation factor, as evidenced by the smallest standard deviation of the number of neighboring samples as well as minimal side-lobe energy in the point spread function. The optimality of the proposed scheme was also confirmed by minimal image artifacts in phantom images. Human lung images showed that the proposed sampling scheme significantly reduced streak and ring artifacts compared with the conventional retrospective respiratory gating while suppressing motion-related blurring compared with full sampling without respiratory gating. In conclusion, the proposed 3D radial-sampling scheme can effectively suppress the image artifacts due to non-uniform k-space sample density in retrospectively respiratory-gated lung MRI by uniformly distributing gated radial views across the k-space. Copyright (c) 2016 John Wiley & Sons, Ltd.
DOI
10.1002/nbm.3494
Appears in Collections:
엘텍공과대학 > 휴먼기계바이오공학부 > Journal papers
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