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DC-gated high resolution three-dimensional lung imaging during free-breathing

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Weick, S., Breuer, F., Ehses, P., Völker, M., Hintze, C., Biederer, J., et al. (2013). DC-gated high resolution three-dimensional lung imaging during free-breathing. Journal of Magnetic Resonance Imaging, 37(3), 727-732. doi:10.1002/jmri.23798.


Cite as: http://hdl.handle.net/21.11116/0000-0001-45CE-A
Abstract
Purpose: To use the acquisition of the k‐space center signal (DC signal) implemented into a Cartesian three‐dimensional (3D) FLASH sequence for retrospective respiratory self‐gating and, thus, for the examination of the whole human lung in high spatial resolution during free breathing. Materials and Methods: Volunteer as well as patient measurements were performed under free breathing conditions. The DC signal is acquired after the actual image data acquisition within each excitation of a 3D FLASH sequence. The DC signal is then used to track respiratory motion for retrospective respiratory gating. Results: It is shown that the acquisition of the DC signal after the imaging module can be used in a 3D FLASH sequence to extract respiratory motion information for retrospective respiratory self‐gating and allows for shorter echo times (TE) and therefore increased lung parenchyma SNR. Conclusion: The acquisition of the DC signal after image signal acquisition allows successful retrospective gating, enabling the reconstruction of high resolution images of the whole human lung under free breathing conditions.