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Measuring fractional anisotropy of the corpus callosum using diffusion tensor imaging: mid-sagittal versus axial imaging planes

 Eung Yeop  ;  Hae-Jeong Park  ;  Dong-Hyun Kim  ;  Seung-Koo Lee  ;  Jinna Kim 
 KOREAN JOURNAL OF RADIOLOGY, Vol.9(5) : 391-395, 2008 
Journal Title
Issue Date
Adult ; Analysis of Variance ; Anisotropy ; Brain Mapping/methods* ; Corpus Callosum/anatomy & histology* ; Diffusion Magnetic Resonance Imaging/methods* ; Female ; Humans ; Image Processing, Computer-Assisted ; Male ; Statistics, Nonparametric
Corpus callosum ; Diffusion magnetic resonance ; imaging ; Anisotropy
OBJECTIVE: Many diffusion tensor imaging (DTI) studies of the corpus callosum (CC) have been performed with a relatively thick slice thickness in the axial plane, which may result in underestimating the fractional anisotropy (FA) of the CC due to a partial volume effect. We hypothesized that the FA of the CC can be more accurately measured by using mid-sagittal DTI. We compared the FA values of the CC between the axial and mid-sagittal DTI.

MATERIALS AND METHODS: Fourteen healthy volunteers underwent MRI at 3.0 T. DTI was performed in both the mid-sagittal and axial planes. One 5-mm mid-sagittal image and twenty-five 2-mm axial images were obtained for the CC. The five regions of interest (ROIs) that included the prefrontal (I), premotor and supplementary motor (II), motor (III), sensory (IV) and parietal, temporal and occipital regions (V) were drawn along the border of the CC on each sagittal FA map. The FA values obtained from each region were compared between the two sagittal maps.

RESULTS: The FA values of all the regions, except for region V, were significantly increased on the mid-sagittal imaging. The FA values in region IV were significantly underestimated on the mid-sagittal image from the axial imaging, compared with those in the regions I and V (p = 0.037 and p = 0.001, respectively).

CONCLUSION: The FA values of the CC were significantly higher on the mid-sagittal DTI than those on the axial DTI in regions I-IV, and particularly in the region IV. Mid-sagittal DTI may provide more accurate FA values of the CC than can the axial DTI, and mid-sagittal DTI may be more desirable for studies that compare between patients and healthy subjects.
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1. College of Medicine (의과대학) > Dept. of Nuclear Medicine (핵의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Eung Yeop(김응엽)
Kim, Jinna(김진아) ORCID logo https://orcid.org/0000-0002-9978-4356
Park, Hae Jeong(박해정) ORCID logo https://orcid.org/0000-0002-4633-0756
Lee, Seung Koo(이승구) ORCID logo https://orcid.org/0000-0001-5646-4072
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