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Updated: May 5, 2026
Assessment of Cardiac Function and Myocardial Morphology Using Small Animal Look-locker Inversion Recovery SALLI MRI in Rats
Published on: July 19, 2013
Accurate myocardial T1 mapping at 5T using an improved modified Look-Locker inversion recovery method: A validation
Linqi Ge1, Yinuo Zhao2, Yubo Guo3
1Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China; State Key Laboratory of Biomedical Imaging Science and System, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China; University of Chinese Academy of Sciences, Beijing, China.
This study introduces coMOLLI, a new myocardial T1 mapping technique for 5 Tesla MRI. It achieves high accuracy in phantom and in vivo studies, showing potential for clinical cardiac imaging.
Area of Science:
- Cardiovascular Magnetic Resonance Imaging
- Quantitative MRI Techniques
- Myocardial Tissue Characterization
Background:
- Accurate myocardial T1 mapping at 5 Tesla (5T) is challenging due to magnetic field inhomogeneity and long T1 values.
- Existing techniques struggle with precision, necessitating improved methods for clinical application.
Purpose of the Study:
- To develop and validate a clinically applicable myocardial T1 mapping technique for 5T MRI systems.
- To address technical challenges including field inhomogeneity and prolonged T1 values at 5T.
Main Methods:
- A novel 5-(3)-3 Modified Look-Locker Inversion Recovery (MOLLI) sequence, termed combined-correction MOLLI (coMOLLI), was developed.
- coMOLLI utilizes a radiofrequency spoiled gradient recalled echo (GRE) readout and models signal evolution to correct for inversion efficiency and readout disturbances.
- Optimized inversion pulses (Tan/Tanh) and redesigned pulse sequences were employed to enhance accuracy under 5T hardware constraints and observed B0/B1 variations.
Main Results:
- Phantom studies demonstrated high accuracy for coMOLLI, with relative errors within 5% compared to reference inversion recovery - fast spin echo (IR-FSE).
- In vivo studies on healthy volunteers yielded average native myocardial T1 values of 1468 ± 48 ms (apical), 1514 ± 39 ms (middle), and 1545 ± 50 ms (base).
- Average blood T1 values were measured at 2182 ± 132 ms (apical), 2124 ± 153 ms (middle), and 2131 ± 158 ms (base).
Conclusions:
- The coMOLLI method exhibits high accuracy in phantom experiments and feasibility in vivo.
- By leveraging the established 5-(3)-3 MOLLI acquisition scheme, coMOLLI shows significant potential for clinical cardiac imaging at 5T.
