Abstract
Diffusion-weighted imaging (DWI) of the brain represents a new imaging technique that extends imaging from depiction of neuroanatomy to the level of function and physiology. DWI measures a fundamentally different physiological parameter compared with conventional MRI. Image contrast is related to differences in the diffusion rate of water molecules rather than to changes in total tissue water. DWI can reveal pathology in cases where conventional MRI remains unremarkable. DWI has proven to be highly sensitive in the early detection of acute cerebral ischemia and seems promising in the evaluation of traumatic brain injury. DWI can differentiate between lesions with decreased and increased diffusion. In addition, full-tensor DWI can evaluate the microscopic architecture of the brain, in particular white matter tracts, by measuring the degree and spatial distribution of anisotropic diffusion within the brain. This article reviews the basic concepts of DWI and its application in cerebral ischemia and traumatic brain injury.
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Appendix
In all presented images (with exception of Fig. 1) full-tensor DWI was performed averaged over three data sets for a total acquisition time of 126 s. The entire diffusion tensor was sampled using a spin-echo single-shot echo-planar sequence repeated in six colinear directions. Imaging parameters were TR=6000 ms, TE=118 ms, slice thickness 6 mm, interslice gap 1 mm, field of view 40×20 cm, and acquisition matrix 256×128 pixels. Diffusion gradients were applied at a finite low b value (3 s/mm2) and a high b value (1221 s/mm2). The sequence has been previously described in detail [10]. In Fig. 1, images were averaged over eight data sets.
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Huisman, T.A.G.M. Diffusion-weighted imaging: basic concepts and application in cerebral stroke and head trauma. Eur Radiol 13, 2283–2297 (2003). https://doi.org/10.1007/s00330-003-1843-6
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DOI: https://doi.org/10.1007/s00330-003-1843-6