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Whole-heart T 1 mapping using a 2D fat image navigator for respiratory motion compensation.
- Source :
-
Magnetic resonance in medicine [Magn Reson Med] 2020 Jan; Vol. 83 (1), pp. 178-187. Date of Electronic Publication: 2019 Aug 09. - Publication Year :
- 2020
-
Abstract
- Purpose: To combine a 3D saturation-recovery-based myocardial T <subscript>1</subscript> mapping (3D SASHA) sequence with a 2D image navigator with fat excitation (fat-iNAV) to allow 3D T <subscript>1</subscript> maps with 100% respiratory scan efficiency and predictable scan time.<br />Methods: Data from T <subscript>1</subscript> phantom and 10 subjects were acquired at 1.5T. For respiratory motion compensation, a 2D fat-iNAV was acquired before each 3D SASHA k-space segment to correct for 2D translational motion in a beat-to-beat fashion. The effect of the fat-iNAV on the 3D SASHA T1 estimation was evaluated on the T <subscript>1</subscript> phantom. For 3 representative subjects, the proposed free-breathing 3D SASHA with fat-iNAV was compared to the original implementation with the diaphragmatic navigator. The 3D SASHA with fat-iNAV was compared to the breath-hold 2D SASHA sequence in terms of accuracy and precision.<br />Results: In the phantom study, the Bland-Altman plot shows that the 2D fat-iNAVs does not affect the T <subscript>1</subscript> quantification of the 3D SASHA acquisition (0 ± 12.5 ms). For the in vivo study, the 2D fat-iNAV permits to estimate the respiratory motion of the heart, while allowing for 100% scan efficiency, improving the precision of the T <subscript>1</subscript> measurement compared to non-motion-corrected 3D SASHA. However, the image quality achieved with the proposed 3D SASHA with fat-iNAV is lower compared to the original implementation, with reduced delineation of the myocardial borders and papillary muscles.<br />Conclusions: We demonstrate the feasibility to combine the 3D SASHA T <subscript>1</subscript> mapping imaging sequence with a 2D fat-iNAV for respiratory motion compensation, allowing 100% respiratory scan efficiency and predictable scan time.<br /> (© 2019 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine.)
- Subjects :
- Adult
Algorithms
Breath Holding
Female
Humans
Image Interpretation, Computer-Assisted methods
Imaging, Three-Dimensional
Male
Myocardium
Phantoms, Imaging
Reproducibility of Results
Adipose Tissue diagnostic imaging
Heart diagnostic imaging
Image Processing, Computer-Assisted methods
Magnetic Resonance Imaging
Respiration
Subjects
Details
- Language :
- English
- ISSN :
- 1522-2594
- Volume :
- 83
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Magnetic resonance in medicine
- Publication Type :
- Academic Journal
- Accession number :
- 31400054
- Full Text :
- https://doi.org/10.1002/mrm.27919