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Free-Breathing, Motion-Corrected, Highly Efficient Whole Heart T2 Mapping at 3T with Hybrid Radial-Cartesian Trajectory.

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Title: Free-Breathing, Motion-Corrected, Highly Efficient Whole Heart T2 Mapping at 3T with Hybrid Radial-Cartesian Trajectory.
Authors: Yang, Hsin‐Jung1,2, Sharif, Behzad1, Pang, Jianing1, Kali, Avinash1,2, Bi, Xiaoming3, Cokic, Ivan1, Li, Debiao1,2,4, Dharmakumar, Rohan1,4,5
Source: Magnetic Resonance in Medicine. Jan2016, Vol. 75 Issue 1, p126-136. 11p.
Abstract: Purpose: To develop and test a time-efficient, free-breathing, whole heart T2 mapping technique at 3.0T. Methods: ECG-triggered three-dimensional (3D) images were acquired with different T2 preparations at 3.0T during free breathing. Respiratory motion was corrected with a navigatorguided motion correction framework at near perfect efficiency. Image intensities were fit to a monoexponential function to derive myocardial T2 maps. The proposed 3D, free breathing, motion-corrected (3D-FB-MoCo) approach was studied in ex vivo canine hearts and kidneys, healthy volunteers, and canine subjects with acute myocardial infarction (AMI). Results: Ex vivo T2 values from proposed 3D T2-prep gradient echo were not different from two-dimensional (2D) spin echo (P=0.7) and T2-prep balanced steady-state free precession (bSSFP) (P=0.7). In healthy volunteers, compared with 3DFB- MoCo and breath-held 2D T2-prep bSSFP (2D-BH), non- motion-corrected (3D-FB-Non-MoCo) myocardial T2 was longer, had a larger coefficient of variation (COV), and had a lower image quality (IQ) score (T2=40.3 ms, COV=38%, and IQ=2.3; all P<0.05). Conversely, the mean and COV and IQ of 3D-FB-MoCo (T2=37.7 ms, COV=17%, and IQ=3.5) and 2D-BH (T2=38.0 ms, COV=15%, and IQ=3.8) were not different (P=0.99, P=0.74, and P=0.14, respectively). In AMI, T2 values and edema volumes from 3D-FB-MoCo and 2D-BH were closely correlated (R2=0.88 and 0.96, respectively). Conclusion: The proposed whole heart T2 mapping approach can be performed within 5 min with similar accuracy to that of the 2D-BH T2 mapping approach. [ABSTRACT FROM AUTHOR]
Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Magnetic+Resonance+in+Medicine%22&quot;&gt;Magnetic Resonance in Medicine&lt;/searchLink&gt;. Jan2016, Vol. 75 Issue 1, p126-136. 11p.
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  Data: Purpose: To develop and test a time-efficient, free-breathing, whole heart T2 mapping technique at 3.0T. Methods: ECG-triggered three-dimensional (3D) images were acquired with different T2 preparations at 3.0T during free breathing. Respiratory motion was corrected with a navigatorguided motion correction framework at near perfect efficiency. Image intensities were fit to a monoexponential function to derive myocardial T2 maps. The proposed 3D, free breathing, motion-corrected (3D-FB-MoCo) approach was studied in ex vivo canine hearts and kidneys, healthy volunteers, and canine subjects with acute myocardial infarction (AMI). Results: Ex vivo T2 values from proposed 3D T2-prep gradient echo were not different from two-dimensional (2D) spin echo (P=0.7) and T2-prep balanced steady-state free precession (bSSFP) (P=0.7). In healthy volunteers, compared with 3DFB- MoCo and breath-held 2D T2-prep bSSFP (2D-BH), non- motion-corrected (3D-FB-Non-MoCo) myocardial T2 was longer, had a larger coefficient of variation (COV), and had a lower image quality (IQ) score (T2=40.3 ms, COV=38%, and IQ=2.3; all P&lt;0.05). Conversely, the mean and COV and IQ of 3D-FB-MoCo (T2=37.7 ms, COV=17%, and IQ=3.5) and 2D-BH (T2=38.0 ms, COV=15%, and IQ=3.8) were not different (P=0.99, P=0.74, and P=0.14, respectively). In AMI, T2 values and edema volumes from 3D-FB-MoCo and 2D-BH were closely correlated (R2=0.88 and 0.96, respectively). Conclusion: The proposed whole heart T2 mapping approach can be performed within 5 min with similar accuracy to that of the 2D-BH T2 mapping approach. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Magnetic Resonance in Medicine is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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              Text: Jan2016
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