Accelerated real-time cardiac MRI using iterative sparse SENSE reconstruction: comparing performance in patients with sinus rhythm and atrial fibrillation

Bradley D. Allen*, Maria L. Carr, Michael Markl, Michael O. Zenge, Michaela Schmidt, Mariappan S. Nadar, Bruce Spottiswoode, Jeremy D Collins, James Carr

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Objectives: To compare accelerated real-time cardiac MRI (CMR) using sparse spatial and temporal undersampling and non-linear iterative SENSE reconstruction (RT IS SENSE) with real-time CMR (RT) and segmented CMR (SEG) in a cohort that included atrial fibrillation (AF) patients. Methods: We evaluated 27 subjects, including 11 AF patients, by acquiring steady-state free precession cine images covering the left ventricle (LV) at 1.5 T with SEG (acceleration factor 2, TR 42 ms, 1.8 × 1.8 × 6 mm3), RT (acceleration factor 3, TR 62 ms, 3.0 × 3.0 × 7 mm3), and RT IS SENSE (acceleration factor 9.9-12, TR 42 ms, 2.0 × 2.0 × 7 mm3). We performed quantitative LV functional analysis in sinus rhythm (SR) patients and qualitatively scored image quality, noise and artefact using a 5-point Likert scale in the complete cohort and AF and SR subgroups. Results: There was no difference between LV functional parameters between acquisitions in SR patients. RT IS SENSE short-axis image quality was superior to SEG (4.5 ± 0.6 vs. 3.9 ± 1.1, p = 0.007) and RT (3.8 ± 0.4, p = 0.003). There was reduced artefact in RT IS SENSE compared to SEG (4.4 ± 0.6 vs. 3.8 ± 1.2, p = 0.04), driven by arrhythmia performance. RT IS SENSE short-axis image quality was superior to SEG (4.6 ± 0.5 vs. 3.1 ± 1.0, p < 0.001) in the AF subgroup. Conclusion: Accelerated real-time CMR with iterative sparse SENSE provides excellent clinical performance, especially in patients with AF. Key Points: • Iterative sparse SENSE significantly accelerates real-time cardiovascular MRI acquisitions. • It provides excellent qualitative and quantitative performance in sinus rhythm patients. • It outperforms standard segmented acquisitions in patients with atrial fibrillation. • It improves the trade-off between temporal and spatial resolution in real-time imaging.

Original languageEnglish (US)
Pages (from-to)3088-3096
Number of pages9
JournalEuropean Radiology
Volume28
Issue number7
DOIs
StatePublished - Jul 1 2018

Keywords

  • Acceleration
  • Atrial fibrillation
  • Cardiac imaging techniques
  • Cine MRI
  • Left ventricular function

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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