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Respiratory motion-compensated high-resolution 3D whole-heart T1ρ mapping.
- Source :
-
Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance [J Cardiovasc Magn Reson] 2020 Feb 03; Vol. 22 (1), pp. 12. Date of Electronic Publication: 2020 Feb 03. - Publication Year :
- 2020
-
Abstract
- Background: Cardiovascular magnetic resonance (CMR) T1ρ mapping can be used to detect ischemic or non-ischemic cardiomyopathy without the need of exogenous contrast agents. Current 2D myocardial T1ρ mapping requires multiple breath-holds and provides limited coverage. Respiratory gating by diaphragmatic navigation has recently been exploited to enable free-breathing 3D T1ρ mapping, which, however, has low acquisition efficiency and may result in unpredictable and long scan times. This study aims to develop a fast respiratory motion-compensated 3D whole-heart myocardial T1ρ mapping technique with high spatial resolution and predictable scan time.<br />Methods: The proposed electrocardiogram (ECG)-triggered T1ρ mapping sequence is performed under free-breathing using an undersampled variable-density 3D Cartesian sampling with spiral-like order. Preparation pulses with different T1ρ spin-lock times are employed to acquire multiple T1ρ-weighted images. A saturation prepulse is played at the start of each heartbeat to reset the magnetization before T1ρ preparation. Image navigators are employed to enable beat-to-beat 2D translational respiratory motion correction of the heart for each T1ρ-weighted dataset, after which, 3D translational registration is performed to align all T1ρ-weighted volumes. Undersampled reconstruction is performed using a multi-contrast 3D patch-based low-rank algorithm. The accuracy of the proposed technique was tested in phantoms and in vivo in 11 healthy subjects in comparison with 2D T1ρ mapping. The feasibility of the proposed technique was further investigated in 3 patients with suspected cardiovascular disease. Breath-hold late-gadolinium enhanced (LGE) images were acquired in patients as reference for scar detection.<br />Results: Phantoms results revealed that the proposed technique provided accurate T1ρ values over a wide range of simulated heart rates in comparison to a 2D T1ρ mapping reference. Homogeneous 3D T1ρ maps were obtained for healthy subjects, with septal T1ρ of 58.0 ± 4.1 ms which was comparable to 2D breath-hold measurements (57.6 ± 4.7 ms, P = 0.83). Myocardial scar was detected in 1 of the 3 patients, and increased T1ρ values (87.4 ± 5.7 ms) were observed in the infarcted region.<br />Conclusions: An accelerated free-breathing 3D whole-heart T1ρ mapping technique was developed with high respiratory scan efficiency and near-isotropic spatial resolution (1.7 × 1.7 × 2 mm <superscript>3</superscript> ) in a clinically feasible scan time of ~ 6 mins. Preliminary patient results suggest that the proposed technique may find applications in non-contrast myocardial tissue characterization.
- Subjects :
- Adult
Algorithms
Feasibility Studies
Female
Humans
Male
Middle Aged
Myocardial Infarction etiology
Myocardial Infarction pathology
Phantoms, Imaging
Predictive Value of Tests
Reproducibility of Results
Cardiac-Gated Imaging Techniques instrumentation
Electrocardiography
Heart Rate
Imaging, Three-Dimensional
Magnetic Resonance Imaging instrumentation
Myocardial Infarction diagnostic imaging
Myocardium pathology
Respiration
Subjects
Details
- Language :
- English
- ISSN :
- 1532-429X
- Volume :
- 22
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance
- Publication Type :
- Academic Journal
- Accession number :
- 32014001
- Full Text :
- https://doi.org/10.1186/s12968-020-0597-5