多层螺旋CT灌注成像在脑肿瘤中的应用研究

时间:2020-10-07 14:53:51 药学毕业论文 我要投稿

多层螺旋CT灌注成像在脑肿瘤中的应用研究

作者:鞠发军, 闫培华, 唐公杰, 蔡自强
【关键词】 多层螺旋CT;,,脑灌注成像;,,脑肿瘤
  摘要:目的:探讨多层螺旋CT灌注成像在脑肿瘤中的应用价值。方法:应用GE lightspeedl6层螺旋CT扫描机,对经证实的20例脑瘤患者(脑膜瘤9例,胶质瘤7例,胶质瘤术后复发4例),先行CT平扫,选定感兴趣区行多层螺旋CT脑灌注成像,经灌注软件处理,计算出局部血容量图trCBV)、局部血流量医(rCBF)、表面通透性(PS),并与对侧相应脑组织灌注参数进行比较。所有病例均经CT随访或经MRI证实。部分病例联合CT增强扫描。结果:脑膜瘤、星形细胞瘤和胶质瘤术后复发三者中rCBV、rCBF、PS值均高于正常脑组织,其中脑膜瘤最高,高级别星形细胞瘤高于低级别星形细胞瘤。肿瘤的rCBV、rCBF、PS值与肿瘤的MVD呈正相关。结论:多层螺旋CT灌注成像能够在脑瘤的诊断、术前术后的随访中提供有价值的参考信息。
  关键词: 多层螺旋CT; 脑灌注成像; 脑肿瘤
  The Preliminary Research of MSCT Perfusion Imaging in Cerbral Neoplasmas
  Abstract: Objective: To discuss the clinical value of MSCT perfusion imge on the cerbral neoplasmas of glioma. Method: Using GE lightspeed 16spiral CT scanner, to carry out CT even sweep toward the 20 confirmed patients of acute cerbral neoplasmas (including meningiomas 9 cases astrocytoma 7 cases,glioma post-operrati on recurrent 4 cases) in advance. The color map of regiol cerebral blood volume(rCBV),region cerebral blood flow(rCBF) mid pcrmeability surfiace(PS) was obtained by perfusion software,and rCBV rCBF and PS were calaculated in different areas. Parts of cases consociation CT strengthens to scan. Result: The values of CBV rCBF anti PS of the three diseases meningiomas,astrocytoma, and glioma post-operration recmrent were higher than that of the brain organize. The meningiomas is the highest in the three. The values of rCBV rCBF and PS of the highe grade astrocytoma tumors were higher than that of lee grade astrocytoma tumors.There were positive linear correlation between the MVD and tumor rCBV rCBF and PS.Conclusion: MSCT perfusion imge can reflect the cerbral neoplasmas changes of blood flow. It may offer useful information diagnosis,the frot-operation and post-opration follow-up of cerbral neoplasmas.
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  Key words: Mulit-slice spiral CT; Cerebral perrinsion imaging; Cerbral neoplasmas
  随着多层螺旋CT的应用,计算方法的改进,可以进行多层同层灌注扫描,使以前主要应用于脑梗塞的诊断研究的.CT灌注成像,也可以用于有血脑屏障破坏的脑肿瘤性病变的诊断与鉴别以及疗效的评价。多层螺旋CT灌注成像作为一种功能性影像检查方法,反映的是组织微血管的功能状况,在脑肿瘤的定量定性研究中有着广阔的前景。本文通过对20例脑肿瘤患者的多层螺旋CT灌注成像联合CT增强扫描的研究,探讨其在脑肿瘤诊断中的价值。
  1 材料与方法
  1.1 本组20例脑瘤患者,男14例,女6例,年龄16~72岁,主要症状及体征有恶心、呕吐、癫痫、头痛、复视、肌力减退、肢体活动不灵等。本组所有病例均经手术病理证实,术前均经CT平扫及灌注扫描。
  1.2 检查方法:应用多层螺旋CT灌注成像联合CT增强扫描的方法,首先对病人用GE Lightspeed l6层螺旋CT扫描机行常规颅脑扫描,120kV/160mA,颅底层厚5mm、间隔5mm,以上层面层厚10mm、间隔10mm连续扫描; 根据CT平扫图像,选择合适的病灶扫描层面行脑CT灌注检查,扫描层面选择4层,每层5mm连续扫描。灌注CT检查方法:经肘静脉由高压注射器注射碘海醇50ml注射速率4ml/s,注射后5s扫描,扫描方式cine、层厚5mm;80kV、200mA;1s/层。检查完成后,继续经高压注射器注射造影剂50ml,同时从颅底至颅项行增强扫描,层厚7.5cm螺旋扫描,可根据实际情况延迟3~8min后再行延迟扫描。行颅脑CTA检查时,须延时至少30min以上。检查完毕后,将图像发送至GE ADW4.2工作站进行处理,从软件选项中分别选择CT Peffusion 3脑肿瘤灌注分析软件和CTA血管成像软件进行图像处理,灌注成像其工作流程分以下4个步骤:①选取灌注图像;②图像校准处理;③选出感兴趣区,包括流入动脉、流出静脉及病灶;④计算分析灌注图像及灌注参数。分别汁算出局部脑血容积(region cerebral bloo dvolume,rCBV)图、局部脑血流速度(region cexebral blood flow,rCBF)图、表面通透性(permeability surlace,PS);并且通过选定区域进行镜面rCBV、rCBF、PS值的对比测量。