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  Rapid and motion-robust volume coverage using cross-sectional real-time MRI.

Voit, D., Kalentev, O., van Zalk, M., Joseph, A. A., & Frahm, J. (2020). Rapid and motion-robust volume coverage using cross-sectional real-time MRI. Magnetic Resonance in Medicine, 83(5), 1652-1658. doi:10.1002/mrm.28029.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-5929-A Version Permalink: http://hdl.handle.net/21.11116/0000-0005-9387-C
Genre: Journal Article

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 Creators:
Voit, D.1, Author              
Kalentev, O.1, Author              
van Zalk, M.1, Author              
Joseph, A. A.1, Author              
Frahm, J.1, Author              
Affiliations:
1Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society, ou_578634              

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Free keywords: nonlinear inverse reconstruction; real-time MRI; volume coverage
 Abstract: PURPOSE: To develop a rapid and motion-robust technique for volumetric MRI, which is based on cross-sectional real-time MRI acquisitions with automatic advancement of the slice position. METHODS: Real-time MRI with a frame-by-frame moving cross-section is performed with use of highly undersampled radial gradient-echo sequences offering spin density, T1 , or T2 /T1 contrast. Joint reconstructions of serial images and coil sensitivity maps from spatially overlapping sections are accomplished by nonlinear inversion with regularization to the preceding section-formally identical to dynamic real-time MRI. Shifting each frame by 20% to 25% of the section thickness ensures 75% to 80% overlap of successive sections. Acquisition times of 40 to 67 ms allow for rates of 15 to 25 sections per second, while volumes are defined by the number of cross-sections times the section shift. RESULTS: Preliminary realizations at 3T comprise studies of the human brain, carotid arteries, liver, and prostate. Typically, coverage of a 90- to 180-mm volume at 0.8- to 1.2-mm in-plane resolution, 4- to 6-mm section thickness, and 0.8- to 1.5-mm section shift is accomplished within total measuring times of 4 to 6 seconds and a section speed of 15 to 37.5 mm per second. However, spatiotemporal resolution, contrast including options such as fat saturation and total measuring time are highly variable and may be adjusted to clinical needs. Promising volumetric applications range from fetal MRI to dynamic contrast-enhanced MRI. CONCLUSION: The proposed method allows for rapid and motion-robust volume coverage in a variety of imaging scenarios.

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Language(s): eng - English
 Dates: 2019-10-312020-05
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1002/mrm.28029
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 83 (5) Sequence Number: - Start / End Page: 1652 - 1658 Identifier: -