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Using Dictionary Matching to Improve the Accuracy of MOLLI Myocardial T1 Analysis and Measurements of Heart Rate Variability

We analyzed modified Look-Locker inversion recovery (MOLLI) T1 measurements by applying a dictionary matching strategy and aimed to acquire T1 measurements more accurately than those acquired by the conventional three-parameter matching analysis. We particularly clarified the robustness of this meth...

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Autores principales: Endo, Yuta, Kobayashi, Kuninori, Shibo, Haruna, Amanuma, Makoto, Kuhara, Shigehide
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Japanese Society for Magnetic Resonance in Medicine 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10449558/
https://www.ncbi.nlm.nih.gov/pubmed/35732413
http://dx.doi.org/10.2463/mrms.tn.2022-0013
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author Endo, Yuta
Kobayashi, Kuninori
Shibo, Haruna
Amanuma, Makoto
Kuhara, Shigehide
author_facet Endo, Yuta
Kobayashi, Kuninori
Shibo, Haruna
Amanuma, Makoto
Kuhara, Shigehide
author_sort Endo, Yuta
collection PubMed
description We analyzed modified Look-Locker inversion recovery (MOLLI) T1 measurements by applying a dictionary matching strategy and aimed to acquire T1 measurements more accurately than those acquired by the conventional three-parameter matching analysis. We particularly clarified the robustness of this method for measuring heart rate (HR) variability. A phantom experiment using a 3T MRI system was performed for various HRs. The ideal MOLLI signal corresponding to the scan parameter in the MRI experiment was simulated over a wide range of T1 values according to the dictionary. The unknown T1 values were determined by finding the simulated signals in the dictionary corresponding to the measured signals using pattern matching. The measured T1 values showed that the proposed analysis improved the accuracy of T1 measurements compared to those acquired by traditional analysis by up to 10%. In addition, the variability of measurements at several HRs was reduced by up to 100 ms.
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spelling pubmed-104495582023-08-25 Using Dictionary Matching to Improve the Accuracy of MOLLI Myocardial T1 Analysis and Measurements of Heart Rate Variability Endo, Yuta Kobayashi, Kuninori Shibo, Haruna Amanuma, Makoto Kuhara, Shigehide Magn Reson Med Sci Technical Note We analyzed modified Look-Locker inversion recovery (MOLLI) T1 measurements by applying a dictionary matching strategy and aimed to acquire T1 measurements more accurately than those acquired by the conventional three-parameter matching analysis. We particularly clarified the robustness of this method for measuring heart rate (HR) variability. A phantom experiment using a 3T MRI system was performed for various HRs. The ideal MOLLI signal corresponding to the scan parameter in the MRI experiment was simulated over a wide range of T1 values according to the dictionary. The unknown T1 values were determined by finding the simulated signals in the dictionary corresponding to the measured signals using pattern matching. The measured T1 values showed that the proposed analysis improved the accuracy of T1 measurements compared to those acquired by traditional analysis by up to 10%. In addition, the variability of measurements at several HRs was reduced by up to 100 ms. Japanese Society for Magnetic Resonance in Medicine 2022-06-23 /pmc/articles/PMC10449558/ /pubmed/35732413 http://dx.doi.org/10.2463/mrms.tn.2022-0013 Text en ©2022 Japanese Society for Magnetic Resonance in Medicine https://creativecommons.org/licenses/by-nc-nd/4.0/This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/)
spellingShingle Technical Note
Endo, Yuta
Kobayashi, Kuninori
Shibo, Haruna
Amanuma, Makoto
Kuhara, Shigehide
Using Dictionary Matching to Improve the Accuracy of MOLLI Myocardial T1 Analysis and Measurements of Heart Rate Variability
title Using Dictionary Matching to Improve the Accuracy of MOLLI Myocardial T1 Analysis and Measurements of Heart Rate Variability
title_full Using Dictionary Matching to Improve the Accuracy of MOLLI Myocardial T1 Analysis and Measurements of Heart Rate Variability
title_fullStr Using Dictionary Matching to Improve the Accuracy of MOLLI Myocardial T1 Analysis and Measurements of Heart Rate Variability
title_full_unstemmed Using Dictionary Matching to Improve the Accuracy of MOLLI Myocardial T1 Analysis and Measurements of Heart Rate Variability
title_short Using Dictionary Matching to Improve the Accuracy of MOLLI Myocardial T1 Analysis and Measurements of Heart Rate Variability
title_sort using dictionary matching to improve the accuracy of molli myocardial t1 analysis and measurements of heart rate variability
topic Technical Note
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10449558/
https://www.ncbi.nlm.nih.gov/pubmed/35732413
http://dx.doi.org/10.2463/mrms.tn.2022-0013
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