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

NMR in Biomedicine
Jinil ParkJang-Yeon Park

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 artifa...Continue Reading

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Citations

Sep 1, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jean DelacosteMatthias Stuber
May 1, 2018·European Radiology Experimental·David KenkelAndreas Boss
Mar 15, 2019·Journal of Magnetic Resonance Imaging : JMRI·Su-Zhen DongDorothy Bulas
Dec 22, 2017·NMR in Biomedicine·Byungjai KimHyunWook Park
Apr 18, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Steven KecskemetiAndrew L Alexander
Sep 17, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Tanguy BoucneauXavier Maître
Apr 1, 2017·Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance·M KrämerV Hoerr
Oct 3, 2018·Physics in Medicine and Biology·B StemkensR H N Tijssen

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