- Poster presentation
- Open Access
A Comprehensive Free-Breathing Protocol for Cardiovascular Magnetic Resonance Imaging of Ischemia and Cardiomyopathies: a Feasibility Study
© Fernandes et al. 2016
- Published: 27 January 2016
- Cardiovascular Magnetic Resonance
- Cardiovascular Magnetic Resonance Image
- Inversion Recovery Image
- Traditional Protocol
- Image Quality Analysis
Despite recent advances in cardiovascular magnetic resonance imaging, exams are still considered long and challenging from a technical perspective as well as demanding for patients who have to repeatedly perform multiple breath-holds (BH). Free-breathing (FB) sequences have been developed for distinct applications but they are usually performed in isolation within a traditional protocol that still requires BH based acquisitions. We studied the feasibility of a complete FB exam for the assessment of ischemia and cardiomyopathies integrating different prototype sequences.
Six sequential patients underwent the FB protocol and were retrospectively compared to twelve patients matched for sex, age and type of study who had undergone a routine exam at 1.5T (Magnetom Siemens Aera). The FB protocol comprised orthogonal and cardiac axis localizers, axial black-blood T1w half Fourier single-shot turbo spin echo (HASTE) images, a prototype FLASH perfusion sequence with simultaneous multi-slice acquisition, a prototype cine SSFP sequence with sparse sampling and iterative reconstruction (SSIR) and a prototype respiratory motion-corrected SSFP averaged phase-sensitive inversion recovery images (MOCO-PSIR-LGE). MOCO-PSIR-LGE images were reconstructed rapidly in-line using the Gadgetron framework . Spatial and temporal resolution of the FB sequences matched the traditional protocol which acquired all images during BH including localizers, HASTE axial image FLASH perfusion images, SSFP cines, and 2D single-shot acquisition with SSFP readout for LGE. The two protocols were compared for exam time and overall image quality using the average of the sum of each individual component (perfusion, cine and LGE) on a 4-point scale (3=excellent, 2=good with minor artifacts, 1=diagnostic but with major artifacts, 0=non diagnostic).
A complete FB protocol integrating new prototype sequences is feasible and allows for faster imaging times while maintaining the overall quality of cine, perfusion and LGE images. This FB protocol may not only simplify the exam and make it faster but also improve the robustness of the method in difficult patients where traditional BH sequences perform poorly.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.