The Optimal Trackability Threshold of Fractional Anisotropy for Diffusion Tensor Tractography of the Corticospinal Tract
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概要
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Purpose: In order to ensure that three-dimensional diffusion tensor tractography (3D-DTT) of the corticospinal tract (CST), is performed accurately and efficiently, we set out to find the optimal lower threshold of fractional anisotropy (FA) below which tract elongation is terminated (trackability threshold). Methods: Thirteen patients with acute or early subacute ischemic stroke causing motor deficits were enrolled in this study. We performed 3D-DTT of the CST with diffusion tensor MR (magnetic resonance) imaging. We segmented the CST and established a cross-section of the CST in a transaxial plane as a region of interest. Thus, we selectively measured the FA values of the right and left corticospinal tracts at the level of the cerebral peduncle, the posterior limb of the internal capsule, and the centrum semiovale. The FA values of the CST were also measured on the affected side at the level where the clinically relevant infarction was present in isotropic diffusion-weighted imaging. Results: 3D-DTT allowed us to selectively measure the FA values of the CST. Among the 267 regions of interest we measured, the minimum FA value was 0.22. The FA values of the CST were smaller and more variable in the centrum semiovale than in the other regions. The mean minus twice the standard deviation of the FA values of the CST in the centrum semiovale was calculated at 0.22 on the normal unaffected side and 0.16 on the affected side. Conclusion: An FA value of about 0.20 was found to be the optimal trackability threshold.
- 日本磁気共鳴医学会の論文
- 2004-04-01
著者
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大友 邦
山梨大学 医学部放射線科
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Abe Osamu
Department of Pediatrics, Nihon University School of Medicine
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Ohtomo Kuni
Department Of Radiology Faculty Of Medicine University Of Tokyo
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Ohtomo Kuni
Department Of Radiology School Of Medicine The University Of Tokyo
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Ohtomo Kuni
Ntt東日本関東病院
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Abe Osamu
Department Of Radiology The University Of Tokyo
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KUNIMATSU Akira
Department of Radiology, University of Tokyo Hospital
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HAYASHI Naoto
Department of Radiology, Graduate School of Medicine, University of Tokyo
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AOKI Shigeki
Department of Radiology, The University of Tokyo Hospital
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MASUTANI Yoshitaka
Department of Radiology, The University of Tokyo Hospital
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MASUMOTO Tomohiko
Department of Radiology, The University of Tokyo Hospital
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MORI Harushi
Department of Radiology, The University of Tokyo Hospital
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青木 茂樹
Department Of Radiology Juntendo University School Of Medicine
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Ohtomo Kuni
Department Of Radiology Graduate School Of Medicine University Of Tokyo
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Ohtomo Kuni
Department Of Radiology The University Of Tokyo Graduate School Of Medicine
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Ohtomo Kuni
Department Of Radiology Faculty Of Medicin University Of Tokyo
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Mori Harushi
Department Of Radiology The University Of Tokyo Hospital
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Mori Harushi
Department Of Radiology Graduate School Of Medicine University Of Tokyo
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Hayashi Naoto
Department Of Computational Diagnostic Radiology And Preventive Medicine The University Of Tokyo
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Hayashi Naoto
Department Of Radiology Faculty Of Medicine University Of Tokyo
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Kunimatsu Akira
Department Of Psychiatry National Center Hospital For Mental Nervous And Muscular Disorders National
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Abe Osamu
Department Of General Pediatrics Nihon University Nerima Hikarigaoka Hospital Nihon University Schoo
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Aoki Shigeki
Department Of Radiology Juntendo University School Of Medicine
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Kunimatsu Akira
Department Of Materials Science And Engineering Faculty Of Engineering Yamagata University
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Masumoto Tomohiko
Department Of Radiology The University Of Tokyo Hospital
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Masumoto Tomohiko
Department Of Radiology University Of Tokyo School Of Medicine
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Masumoto Tomohiko
Department Of Radiology University Of Tokyo
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増本 智彦
筑波大学大学院人間総合科学研究科
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Masutani Yoshitaka
Department Of Radiology The University Of Tokyo
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Aoki Shigeki
Department Of Radiology Faculty Of Medicine The University Of Tokyo
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Aoki Shigeki
Department Of Radiology Juntendo University
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Aoki Shigeki
Department Of Hepato-biliary-pancreatic Surgery Tokyo Medical And Dental University
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HAYASHI Naoto
Department of Chemistry, College of Arts and Sciences, The University of Tokyo
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MASUMOTO Tomohiko
Department of Intervention and Radiology, Faculty of Medicine, University of Tsukuba
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