Diffusion Tensor Imaging in Chronic Subdural Hematoma: Correlation between Clinical Signs and Fractional Anisotropy in the Pyramidal Tract

Abstract

BACKGROUND AND PURPOSE: Diffusion tensor imaging (DTI) was introduced as a good technique to evaluate structural abnormalities in the white matter. In this study, we used DTI to examine anisotropic changes of the pyramidal tracts displaced by chronic subdural hematoma (CSDH).

Prediction of Functional Outcome in Acute Cerebral Hemorrhage Using Diffusion Tensor Imaging at 3T: A Prospective Study

“…2,14,15,24 Yokoyama et al 15 reported that the mean FA ratio in the affected pyramidal tract decreased 11% compared with that in the unaffected side among the good-recovery group. In contrast, the mean Fig 1.…”

“…The cutoff point of the rFA that divides the 2 groups is set at 0.85. the corticobulbar tract. 15 The corticospinal tract is a large and highly anisotropic tract; on the other hand, the corticobulbar tract is easily affected by other fibers running in the anteroposterior projection. 29 Moreover, the pyramidal tract does not run precisely perpendicular to the axial plane.…”

“…7,[10][11][12] With regard to hemorrhagic diseases, a few studies have reported that a change in the FA correlates with the functional outcome, using DTI or diffusion tensor tractography. [13][14][15] However, the MR images were obtained at least 3 days after the onset or hematoma removal in these studies, and it is unclear how the FA changes in the very acute phase of ICH or whether the change in the FA in the very acute phase of an ICH correlates with the functional outcome or the motor outcome.…”

High-definition fiber tracking for assessment of neurological deficit in a case of traumatic brain injury: finding, visualizing, and interpreting small sites of damage

“…In addition, DTI FA measurement is compromised by interstitial fluid content. 3,5,17,18 The DTI measurement becomes ambiguous in the presence of hemorrhage and edema (FA decreases when there is an increase in interstitial fluid or loss of axons). In contrast, our high angular resolution tracking technique, HDFT, has the ability to both localize and quantify axonal damage at the level of detail necessary for clinical purposes and is robust to changes in white matter pathway shape, interstitial fluid, and stochastic reseeding of the fiber tracks.…”

Structural MRI research in patients with nasopharyngeal carcinoma following radiotherapy: A DTI and VBM study

“…Magnetic resonance diffusion tensor imaging (DTI) is currently the only non-invasive method used to assess the structure, morphology and function of WM fibers in vivo (8,9). DTI technology has been widely used in research of the central nervous system.…”