Improved simultaneous multislice cardiac MRI using readout concatenated k-space SPIRiT (ROCK-SPIRiT)

Omer Burak Demirel, Sebastian Weingärtner, Steen Moeller, Mehmet Akçakaya

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: To develop and evaluate a simultaneous multislice (SMS) reconstruction technique that provides noise reduction and leakage blocking for highly accelerated cardiac MRI. Methods: ReadOut Concatenated k-space SPIRiT (ROCK-SPIRiT) uses the concept of readout concatenation in image domain to represent SMS encoding, and performs coil self-consistency as in SPIRiT-type reconstruction in an extended k-space, while allowing regularization for further denoising. The proposed method is implemented with and without regularization, and validated on retrospectively SMS-accelerated cine imaging with three-fold SMS and two-fold in-plane acceleration. ROCK-SPIRiT is compared with two leakage-blocking SMS reconstruction methods: readout-SENSE-GRAPPA and split slice–GRAPPA. Further evaluation and comparisons are performed using prospectively SMS-accelerated cine imaging. Results: Results on retrospectively three-fold SMS and two-fold in-plane accelerated cine imaging show that ROCK-SPIRiT without regularization significantly improves on existing methods in terms of PSNR (readout-SENSE-GRAPPA: 33.5 ± 3.2, split slice–GRAPPA: 34.1 ± 3.8, ROCK-SPIRiT: 35.0 ± 3.3) and SSIM (readout-SENSE-GRAPPA: 84.4 ± 8.9, split slice–GRAPPA: 85.0 ± 8.9, ROCK-SPIRiT: 88.2 ± 6.6 [in percentage]). Regularized ROCK-SPIRiT significantly outperforms all methods, as characterized by these quantitative metrics (PSNR: 37.6 ± 3.8, SSIM: 94.2 ± 4.1 [in percentage]). The prospectively five-fold SMS and two-fold in-plane accelerated data show that ROCK-SPIRiT and regularized ROCK-SPIRiT have visually improved image quality compared with existing methods. Conclusion: The proposed ROCK-SPIRiT technique reduces noise and interslice leakage in accelerated SMS cardiac cine MRI, improving on existing methods both quantitatively and qualitatively.

Original languageEnglish (US)
Pages (from-to)3036-3048
Number of pages13
JournalMagnetic resonance in medicine
Volume85
Issue number6
DOIs
StatePublished - Jun 2021

Bibliographical note

Funding Information:
National Institutes of Health (R01HL153146, R21EB028369, and P41EB027061), National Science Foundation (CAREER CCF-1651825), NWO Start-Up Grant STU.019.024, 4TU Federation; ZonMW OffRoad (04510011910073), and an American Heart Association Predoctoral Fellowship

Publisher Copyright:
© 2021 International Society for Magnetic Resonance in Medicine

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

  • accelerated imaging
  • cardiac MRI
  • image reconstruction
  • simultaneous multislice imaging

PubMed: MeSH publication types

  • Journal Article

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