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微血管灌注
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  microvascular perfusion
    Conclusion The ASL is a suitable method for assessment of tumorous microvascular perfusion and allows distinction between high- and low-grade gliomas.
    结论ASL可用于脑肿瘤微血管灌注的评估,有助于区分低级和高级胶质瘤。
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  microvascular perfusion
Within irreversibly injured (infarcted) regions microvascular perfusion can vary from nearly normal to nearly zero, even in the presence of an open infarct-related artery ('no-reflow').
      
Historically, non-invasive assessment of heterogeneous microvascular perfusion within myocardial infarcts has been problematic.
      
The new frontiers of CMR in heart failure hold the promise of unique insights quantifying myocardial iron, nonischemic fibrosis, microvascular perfusion, plaque characterization, and CMR-targeted intervention.
      
Both theno-reflow phenomenon and the events initiated by reflow - termed herein as thereflow-paradox - contribute to the failure of the nutritive microvascular perfusion and loss of tissue viability following ischemia and reperfusion.
      
We studied in vivo the effect of cyclosporine A (CsA) on both pancreatic islet vascularization and microvascular perfusion using intravital fluorescence microscopy and the dorsal skinfold chamber model in Syrian golden hamsters.
      
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  microvascular corrosion casting
With the use of a modified microvascular corrosion casting technique in healthy eye-bank eyes from a 77-year-old woman 9 hours post mortem, a large communication between the central retinal and posterior ciliary arterial systems was demonstrated.
      
Microvascular corrosion casting and translucent specimens were taken from operative specimens taken from 12 patients with Crohn's disease and 8 with ulcerative colitis.
      
The animals underwent microvascular corrosion casting of the livers immediately after application of ILH.
      
Microvascular corrosion casting was used for evaluating qualitatively and quantitatively angiogenesis in the chick chorioallantoic membrane (CAM).
      
In an additional study, animals were treated according to the same regimen and quantitative three-dimensional microvascular corrosion casting was performed to enable detailed assessment of the tumor vascular architecture.
      


Objective To implement an arterial spin labeling (ASL) technique that is feasible in routine examinations and to evaluate the clinical application of the method for imaging blood flow in brain gliomas. Methods Seven volunteers and forty-two patients with intracranial space-occupying lesions were examined at a clinical 3.0-T imaging unit (Magnetom Trio;Siemens). In the patients with brain tumors, thirty-five cases with histologically proven gliomas were included in the study, which were respectively 18 high-grade...

Objective To implement an arterial spin labeling (ASL) technique that is feasible in routine examinations and to evaluate the clinical application of the method for imaging blood flow in brain gliomas. Methods Seven volunteers and forty-two patients with intracranial space-occupying lesions were examined at a clinical 3.0-T imaging unit (Magnetom Trio;Siemens). In the patients with brain tumors, thirty-five cases with histologically proven gliomas were included in the study, which were respectively 18 high-grade gliomas and 17 low-grade tumors. A second version of quantitative imaging of perfusion by using a single subtraction with addition of thin-section periodic saturation after inversion and a time delay (Q2TIPS) technique of pulsed ASL in the multisection mode was implemented, and MR routine examinations were also included. In regions of interest, maps of relative cerebral blood flow (CBF) were computed and analyzed. Statistical analysis was performed by using SPSS 11.0. Results In the volunteers, different cerebral blood flows of gray and white matter determined with ASL were clearly observed. In the patients, ASL technique yielded the higher perfusion values in imaging of high-grade gliomas and the lower values in imaging of low-grade tumors. ASL showed heterogeneous vascularization of some tumors. Statistical analysis demonstrated high-and low-grade gliomas differed significantly (P<0.00001) in terms of the ratios of relative tumor blood flow (TBF) to mean CBF. Conclusion The ASL is a suitable method for assessment of tumorous microvascular perfusion and allows distinction between high- and low-grade gliomas.

目的评价动脉血质子自旋标记(ASL)技术在胶质瘤灌注中的临床应用价值。方法健康志愿者7名,颅内占位患者42例,经手术及病理证实其中胶质瘤35例,高级胶质瘤18例,低级17例。使用3.0TMR成像系统对每人行常规扫描外,加扫可一次采集多层的第二版本Q2TIPS的ASL序列。观测所得相对脑血流量(CBF)图,数据使用SPSS11.0软件包处理分析。结果在健康志愿者中ASL可清楚显示脑灰、白质及深部核团的血流分布不同。在患者中ASL显示了高级胶质瘤的高血流量和低级别的低血流灌注,并且可显示同一肿瘤不均匀的血流分布。相对肿瘤血流量(TBF)在高低级胶质瘤间有显著性差异(P<0.00001)。结论ASL可用于脑肿瘤微血管灌注的评估,有助于区分低级和高级胶质瘤。

 
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