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Diffusion-weighted images

Warach S, Chien D, Li W, Ronthal M, Edelman RR. Fast magnetic resonance diffusion-weighted imaging of acute human stroke. Neurology 1992 42 1717-1723. [Pg.30]

Magnetic resonance imaging of the head will reveal areas of ischemia with higher resolution and earlier than the CT scan. Diffusion-weighted imaging will reveal an evolving infarct within minutes. [Pg.170]

Z. Domingo, J. K. Bradley, K. Blamire, A. M. Brindle, P. Styles and B. Rajagopalan, Diffusion weighted imaging and magnetic resonance spectroscopy in a low flow ischaemia model due to endothelin induced vasospasm. NMR Biomed., 2000, 13, 154-162. [Pg.154]

Fig. 4.7. Coronal measurements of diffusion, proton density (RHO), T1 and T2 relaxation times 30 min after occlusion of the middle cerebral artery in a rat. Note the clear-cut striatal signal increase in the diffusion-weighted image (DWI) compared to nearly unchanged images of the other MR modalities... Fig. 4.7. Coronal measurements of diffusion, proton density (RHO), T1 and T2 relaxation times 30 min after occlusion of the middle cerebral artery in a rat. Note the clear-cut striatal signal increase in the diffusion-weighted image (DWI) compared to nearly unchanged images of the other MR modalities...
Fig. 4.8. Lesion development in permanent middle cerebral artery (MCA) occlusion in a rat measured by repeated MR diffusion-weighted imaging (DWI). Left column Control condition pre-occlusion in coronal slices from posterior (top) to anterior (bottom). The arrow marks the timepoint of occlusion. Images shown in columns 2 to 7 are DWI (subtraction images) measured 30 to 330 min post-occlusion. Note the lesion growth and the increase in signal intensity within the lesion. (Courtesy Dr. M. Hoehn, Cologne)... Fig. 4.8. Lesion development in permanent middle cerebral artery (MCA) occlusion in a rat measured by repeated MR diffusion-weighted imaging (DWI). Left column Control condition pre-occlusion in coronal slices from posterior (top) to anterior (bottom). The arrow marks the timepoint of occlusion. Images shown in columns 2 to 7 are DWI (subtraction images) measured 30 to 330 min post-occlusion. Note the lesion growth and the increase in signal intensity within the lesion. (Courtesy Dr. M. Hoehn, Cologne)...
Fig. 4.12. Mismatch concept of diffusion lesion (smaller) and perfusion deficit (larger) in human territorial brain infarction. Acute MCA territory ischemia/oligemia with a smaller, centrally located diffusion disturbance showing the relationship between infarct core, ischemic penumbra and changes in DWI and PI. DWI, diffusion-weighted imaging PI, perfusion imaging ADC, apparent diffusion coefficient ATP, high energy phosphates MCA, middle cerebral artery... Fig. 4.12. Mismatch concept of diffusion lesion (smaller) and perfusion deficit (larger) in human territorial brain infarction. Acute MCA territory ischemia/oligemia with a smaller, centrally located diffusion disturbance showing the relationship between infarct core, ischemic penumbra and changes in DWI and PI. DWI, diffusion-weighted imaging PI, perfusion imaging ADC, apparent diffusion coefficient ATP, high energy phosphates MCA, middle cerebral artery...
Busza AL, Allen KL, King MD, van Bruggen N, Williams SR, Gadian DG (1992) Diffusion-weighted imaging studies of cerebral ischemia in gerbils potential relevance to energy failure. Stroke 23 1602-1612... [Pg.68]

Strong AJ, Fabricius M, Boutelle MG, Hibbins SJ, Hopwood SE, Jones R, Parkin MC, Lauritzen M (2002) Spreading and synchronous depressions of cortical activity in acutely injured human brain. Stroke 33 2738-2743 Szafer A, Zhong J, Anderson AW, Gore JC (1995) Diffusion-weighted imaging in tissues theoretical models. NMR Biomed 8 289-296... [Pg.72]

During cerebral ischemia, water proton mobility declines rapidly, which may be measured with diffusion-weighted imaging (DWI) or other methods (Nicholson and Sykova 1998). In animal models of focal ischemia, the ADC declines by about 30%-50% starting within a few minutes following onset... [Pg.118]

Huisman TA (2003) Diffusion-weighted imaging basic concepts and application in cerebral stroke and head trauma. Eur Radiol 13 2283-2297... [Pg.129]

Barber PA, Darby DG, Desmond PM, Gerraty RP, Yang Q, Li T, Jolley D, Donnan GA, Tress BM, Davis SM (1999) Identification of major ischemic change. Diffusion-weighted imaging versus computed tomography. Stroke 30 2059-2065... [Pg.145]

Fig. 11.3. Spectroscopic imaging of stroke. Data from a 71-year-old male were obtained at 3 T using conventional CSI with 144 ms echo time (17 min acquisition time). Metabolite intensities are plotted as color-coded overlay on diffusion-weighted images. Intensities of SI maps of NAA and lactate were obtained by time domain data fit using jMRUI. Representative spectra and fit results (red line) are shown in the lower part of the figure. The arrows indicate the position of the respective voxels. Low Lac values and persistent NAA signals in the posterior part of the area with increased signal on the DWI image may be caused by early reperfusion of an M3 branch of the middle cerebral artery and consecutive washout of Lac... Fig. 11.3. Spectroscopic imaging of stroke. Data from a 71-year-old male were obtained at 3 T using conventional CSI with 144 ms echo time (17 min acquisition time). Metabolite intensities are plotted as color-coded overlay on diffusion-weighted images. Intensities of SI maps of NAA and lactate were obtained by time domain data fit using jMRUI. Representative spectra and fit results (red line) are shown in the lower part of the figure. The arrows indicate the position of the respective voxels. Low Lac values and persistent NAA signals in the posterior part of the area with increased signal on the DWI image may be caused by early reperfusion of an M3 branch of the middle cerebral artery and consecutive washout of Lac...
Fig. 11.4. Fast spectroscopic imaging of stroke. SI maps of lactate and NAA. Metabolite intensities are plotted as color-coded overlay on diffusion-weighted images. Intensities were obtained by numerical integration of the peak areas defined in the two spectra below. Data were acquired with the multiple spin echo SI sequence (7 min acquisition time), thus signal resolution is considerably reduced compared to single voxel spectra in Fig. 11.2 or conventional CSI in Fig. 11.3. (Data courtesy of A. Stengel)... Fig. 11.4. Fast spectroscopic imaging of stroke. SI maps of lactate and NAA. Metabolite intensities are plotted as color-coded overlay on diffusion-weighted images. Intensities were obtained by numerical integration of the peak areas defined in the two spectra below. Data were acquired with the multiple spin echo SI sequence (7 min acquisition time), thus signal resolution is considerably reduced compared to single voxel spectra in Fig. 11.2 or conventional CSI in Fig. 11.3. (Data courtesy of A. Stengel)...
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See also in sourсe #XX -- [ Pg.283 ]



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Diffusion weighting

Diffusion-weighted imaging

Diffusion-weighted imaging

Stroke diffusion weighted images

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