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Characterization of stroke lesions using a histogram-based data analysis including diffusion- and perfusion-weighted imaging

机译:使用基于直方图的数据分析的中风病变的表征,包括扩散和灌注加权成像

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Diffusion- and perfusion-weighted magnetic resonance imaging (DWI, PWI) allows the diagnosis of ischemic brain injury at a time when ischemic lesions may not yet be detectable in computer tomography or T2-weighted (T2w) MRI. However, regions with pathologic apparent diffusion coefficients (ADC) do not necessarily match with regions of prolonged mean transit times (MTT) or pathologic relative cerebral blood flow (rCBF). Mismatching parts are thought to correlate with tissues that can be saved by appropriate treatment. Ten patients with cerebral ischemia underwent standard T1w and T2w imaging as well as single-shot echo planar imaging (EPI) DWI, and PWI. Multidimensional histograms were constructed from T2w images, DWI, ADC, rCBF, and MTT maps. After segmenting different tissues, signal changes of ischemic tissues relative to unaffected parenchyma were calculated. Combining different information allowed the segmentation of lesions and unaffected tissues. Acute infarcts exhibited decreased ADC values as well as hypo- and hyperperfused areas. Correlating ADC, T2w, and rCBF with clinical symptoms allowed the estimation of age and perfusion state of the lesions. Combining DWI, PWI, and standard imaging overcomes strongly fluctuating parameters such as ADC values. A multidimensional parameter-set characterizes unaffected and pathologic tissues which may help in the evaluation of new therapeutic strategies.
机译:扩散和灌注加权磁共振成像(DWI,PWI)允许在计算机断层摄影或T2加权(T2W)MRI中尚未检测到缺血性病变时的缺血性脑损伤的诊断。然而,具有病理表观漫射系数(ADC)的区域不一定与延长平均转运时间(MTT)或病理相对脑血流量(RCBF)的区域匹配。被认为与可以通过适当治疗的组织相关的不匹配零件。 10例脑缺血患者接受标准T1W和T2W成像以及单次回声平面成像(EPI)DWI和PWI。多维直方图由T2W图像,DWI,ADC,RCBF和MTT地图构成。在分割不同组织后,计算相对于未受影响的实质的缺血组织的信号变化。组合不同的信息允许病变和未受影响的组织的分割。急性梗塞表现出降低的ADC值以及低次和过腹部的区域。与临床症状相关ADC,T2W和RCBF允许估计病变的年龄和灌注状态。结合DWI,PWI和标准成像克服了强烈波动的参数,如ADC值。多维参数套装表征未受影响和病理组织,这可能有助于评估新的治疗策略。

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