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Noninvasive Quantification of Brain Edema and the Space-Occupying Effect in Rat Stroke Models Using Magnetic Resonance Imaging by T. Gerriets, E. Stolz, M. Walberer, C. Müller, A. Kluge, A. Bachmann, M. Fisher, M. Kaps, and G. Bachmann Stroke Volume 35(2): February 1, 2004 Copyright © American Heart Association, Inc. All rights reserved.
Figure 1. MRI and TTC staining.Figure 1. MRI and TTC staining. Representative T2 images (T2-I) and ADC maps 6 hours (left) and 24 hours (right) after MCAO. Ischemic lesions correspond closely between MRI and TTC staining. The space-occupying effect due to brain edema leads to a strong horizontal displacement of midline structures on MRI. After the brains were removed from the skull (TTC staining), the space-occupying effect caused an extension of the outer edges of the affected hemispheres, while the midline shift almost completely returned to normal. DW-I indicates diffusion-weighted imaging. T. Gerriets et al. Stroke. 2004;35: Copyright © American Heart Association, Inc. All rights reserved.
Figure 2. Correlation between absolute BWC and space-occupying effect.Figure 2. Correlation between absolute BWC and space-occupying effect. Linear regression analysis indicates a highly significant correlation between the space-occupying effect (%HSE) determined from MRI and the increase in absolute BWC (%ΔH2O) in the affected hemisphere (wet/dry method) 6 and 24 hours after MCAO. T. Gerriets et al. Stroke. 2004;35: Copyright © American Heart Association, Inc. All rights reserved.
Figure 3. Space-occupying effect on MRI and TTC staining.Figure 3. Space-occupying effect on MRI and TTC staining. Linear regression analysis of the space-occupying effect, determined from MRI and TTC staining after 24 hours of ischemia, is shown. T. Gerriets et al. Stroke. 2004;35: Copyright © American Heart Association, Inc. All rights reserved.
Figure 4. Impact of edema correction on LV calculation.Figure 4. Impact of edema correction on LV calculation. The difference in uncorrected and corrected hemispheric LV is demonstrated 6 and 24 hours after MCAO. At 6 hours after ischemia, LV is overestimated by 20.3% (9.3%HLV) if edema correction is not performed. After 24 hours, edema correction leads to a reduction of HLV by 18.3%HLV and 16.3%HLV (−29.6% and −28.2%) on MRI and TTC staining, respectively. T. Gerriets et al. Stroke. 2004;35: Copyright © American Heart Association, Inc. All rights reserved.
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