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    A multi-band double-inversion radial fast spin-echo technique for T2 cardiovascular magnetic resonance mapping of the heart

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    Author
    Keerthivasan, Mahesh Bharath
    Mandava, Sagar
    Johnson, Kevin
    Avery, Ryan
    Janardhanan, Rajesh
    Martin, Diego R.
    Bilgin, Ali
    Altbach, Maria I.
    Affiliation
    Univ Arizona, Dept Elect & Comp Engn
    Univ Arizona, Dept Med Imaging
    Univ Arizona, Dept Med
    Univ Arizona, Dept Biomed Engn
    Issue Date
    2018-07-19
    Keywords
    Multi-band pulses
    Radial
    Fast spin echo
    Black blood imaging
    Double inversion recovery
    T2 mapping
    
    Metadata
    Show full item record
    Publisher
    BMC
    Citation
    Keerthivasan et al. Journal of Cardiovascular Magnetic Resonance (2018) 20:49
    Journal
    JOURNAL OF CARDIOVASCULAR MAGNETIC RESONANCE
    Rights
    © The Author(s). 2018
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Background: Double inversion recovery (DIR) fast spin-echo (FSE) cardiovascular magnetic resonance (CMR) sequences are used clinically for black-blood T2-weighted imaging. However, these sequences suffer from slice inefficiency due to the non-selective inversion pulses. We propose a multi-band (MB) encoded DIR radial FSE (MB-DIR-RADFSE) technique to simultaneously excite two slices. This sequence has improved signal-to-noise ratio per unit time compared to a single slice excitation. It is also motion robust and enables the reconstruction of high-resolution black-blood T2-weighted images and T2 maps for the excited slices. Methods: Hadamard encoded MB pulses were used in MB-DIR-RADFSE to simultaneously excite two slices. A principal component based iterative reconstruction was used to jointly reconstruct black-blood T2-weighted images and T2 maps. Phantom and in vivo experiments were performed to evaluate T2 mapping performance and results were compared to a T2-prepared balanced steady state free precession (bSSFP) method. The inter-segment variability of the T2 maps were assessed using data acquired on healthy subjects. A reproducibility study was performed to evaluate reproducibility of the proposed technique. Results: Phantom experiments show that the T2 values estimated from MB-DIR-RADFSE are comparable to the spin-echo based reference, while T2-prepared bSSFP over-estimated T2 values. The relative contrast of the black-blood images from the multi-band scheme was comparable to those from a single slice acquisition. The myocardial segment analysis on 8 healthy subjects indicated a significant difference (p-value < 0.01) in the T2 estimates from the apical slice when compared to the mid-ventricular slice. The mean T2 estimate from 12 subjects obtained using T2-prepared bSSFP was significantly higher (p-value = 0.012) compared to MB-DIR-RADFSE, consistent with the phantom results. The Bland-Altman analysis showed excellent reproducibility between the MB-DIR-RADFSE measurements, with a mean T2 difference of 0.12 ms and coefficient of reproducibility of 2.07 in 15 clinical subjects. The utility of this technique is demonstrated in two subjects where the T2 maps show elevated values in regions of pathology. Conclusions: The use of multi-band pulses for excitation improves the slice efficiency of the double inversion fast spin-echo pulse sequence. The use of a radial trajectory and a joint reconstruction framework allows reconstruction of TE images and T2 maps for the excited slices.
    Note
    Open access journal.
    ISSN
    1532-429X
    PubMed ID
    30025523
    DOI
    10.1186/s12968-018-0470-y
    Version
    Final published version
    Sponsors
    NIH [R01HL085385]
    Additional Links
    https://jcmr-online.biomedcentral.com/articles/10.1186/s12968-018-0470-y
    ae974a485f413a2113503eed53cd6c53
    10.1186/s12968-018-0470-y
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