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1.
 目的 探讨MRI相位对比序列(cine PC)研究和分析脑脊液流动的可能性,并运用该技术对正常志愿者进行分析.方法 采用MRI cine PC序列, 对正常志愿者进行分析,并测量中脑导水管上下丘之间的横断层面脑脊液的流动速度.结果 MRI cine PC序列可清楚地显示心脏周期各个时段各个脑室、脑池和脊髓蛛网膜下腔中脑脊液运动方向的变化,并能对脑脊液流速进行精确地测量.结论 MRI cine PC法是一种新型的无创性的检查手段,对脑脊液的流动有很强的敏感性,是一种很有前途的研究手段.  相似文献   

2.
交通性脑积水脑室分流前后的脑脊液MRI定量研究   总被引:2,自引:0,他引:2  
目的运用MRI cine PC定量研究交通性脑积水脑室分流前后的脑脊液流动情况.材料和方法在1.5T GEHo rizon Signa磁共振机器上利用MRI cine PC程序,在以前实验所得的液体流速与信号强度关系公式的基础上,对16例交通性脑积水的中脑导水管、枕大孔和C2水平脑脊液流速、流量情况进行MRI cine PC检查(1.5TGE Horizon Signa),并对其中10例交通性脑积水脑室引流后的中脑导水管和枕大孔处脑脊液的流速和流量同样进行测量,并与术前进行比较.同时作为对照,对31例正常志愿者颅内中脑导水管、枕大孔和C2水平的脑脊液流速和流量进行测定.结果交通性脑积水中脑导水管水平脑脊液流速和流量明显增快,与正常者进行统计有明显差异(P<0.05),向下峰速和向上峰速分别为47.57±16.71mm/s和44.48±19.22mm/s,向下流量及向上流量明显增大为3.142±1.055ml/s及3.143±1.055ml/s;脑脊液净流量为0±0.003ml/s.而枕大孔向下峰速和向上峰速分别为1.37±0.44mm/s和1.33±0.41mm/s,向下流量及向上流量分别为0.351±0.125ml/s及0.350±0.121ml/s;脑脊液净流量为0.001±0.007ml/s.C2水平脑脊液向下峰速和向上峰速分别为2.41±1.27mm/s和2.95±1.15mm/s,向下流量及向上流量分别为0.521±0.214ml/s和0.519±0.214ml/s;脑脊液净流量为0.002±0.003ml/s.其中10例交通性脑积水经VP手术前后对比分析,发现术后症状改善明显者中脑导水管脑脊液流速和向上、下的流量均较术前明显减少(P<0.05).结论MRI cine PC对脑脊液(CSF)流动的研究具有非损伤性和对脑脊液流动敏感的特点,是一种优于其他方法的研究CSF流动的重要方法,同时对脑脊液循环障碍疾病的脑脊液流动情况也能定量测定,对VP分流前后的交通性脑积水的脑脊液流速、流量和方向的确定,对估计其术后效果具有重要意义.  相似文献   

3.
目的:应用磁共振相位对比法,揭示脑与脑脊液运动的相互关系,以评价此方法对鉴别蛛网膜囊肿与蛛网膜下腔扩大的诊断价值。材料与方法:运用磁共振相位对比电影和流动分析软件,对10例健康人脑与脑脊液运动规律相关性进行研究和10例影像学疑蛛网膜囊肿或蛛网膜下腔扩大患者的脑脊液运动进行最化分析,绘出一个心动周期不同时相脑脊液流量贡线和时间、信号强度曲线,并进行分析比较。结果:脑脊液流动是由脑运动驱动引起,而脑运  相似文献   

4.
目的 :采用MRI不同翻转角脉冲触发三维扰相自旋回波(SPACE)序列测定交通性脑积水患者颅内脑脊液体积。方法:选取30例交通性脑积水患者,男女各15例,脑室分流前及分流后分别于3.0 T MRI上采用SPACE序列形成颅内与脑室的VR影像。通过软件测量获得颅内脑脊液总体积与脑室脑脊液的体积,并计算蛛网膜下腔脑脊液的体积。结果 :交通性脑积水患者脑室-腹腔(V-P)分流前颅内脑脊液总体积、脑室及蛛网膜下腔脑脊液体积均值分别为(577.6±112.3)cm3、(213.0±53.0)cm3、(364.6±88.5)cm3,分流后分别为(444.8±80.3)cm3、(156.6±45.9)cm3、(276.6±67.4)cm3。分流前后颅内脑脊液总体积、脑室及蛛网膜下腔脑脊液体积差异均有统计学意义(P0.05)。男性患者分流前后2次测量的颅内脑脊液总体积、脑室及蛛网膜下腔脑脊液体积与女性患者相比差异均无统计学意义(P0.05)。结论:SPACE序列定量分析脑脊液含量可指导临床V-P术的选择,并为准确评价V-P分流术的疗效提供客观标准。  相似文献   

5.
目的 :通过高分辨力黑水序列判断交通性脑积水患者中脑导水管是否通畅。方法 :选择54例交通性脑积水患者,行矢状位黑水序列和轴位脑脊液相位对比电影(PC cine)序列。扫描结束后,由2位高年资医师行双盲法判读;先根据黑水CUBE T_2判断中脑导水管是否流通,根据图像特点诊断中脑导水管流通性。后使用PC cine序列测量中脑导水管处流速,并以此为中脑导水管通畅与否标准,与黑水CUBE T_2序列进行对照。比较交通性脑积水和正常对照组中脑导水管脑脊液流速和流量。结果:交通性脑积水患者中脑导水管流速和流量明显大于正常志愿者(均P0.05)。2名医师根据黑水序列诊断交通性脑积水患者中脑导水管畅通性比较差异无统计学意义(P=0.25)。ROC曲线下面积为0.956(95%CI 0.883~0.990),AUC0.9,说明对交通性脑积水的诊断价值较高。结论:MRI黑水序列无创、简便易行,能充分显示交通性脑积水患者脑脊液流动路线,可用于诊断交通性脑积水患者中脑导水管通畅性。  相似文献   

6.
目的 了解脑积水患儿行神经内镜下三脑室底造瘘术后的MRI相位对比电影的表现,评价其用于术后疗效判断的价值.方法 12例脑积水患儿行三脑室底造瘘术前后均行MRI常规序列扫描及相位对比电影检查,评估中脑导水管及三脑室造瘘口的脑脊液流动情况,测量脑脊液流动动力学指标(峰值流速、流量及流动波形),比较其前后的差异.结果 12例脑积水患儿造瘘口脑脊液流动在一个心动周期内表现为双向运动,与正常导水管流动波形相似.其中三脑室造瘘术前7例梗阻性脑积水患儿中脑导水管脑脊液双向流动减弱或消失,表现为低动力学改变;5例交通性脑积水患儿三脑室底造瘘术前中脑导水管脑脊液双向流动明显加快,表现为高动力学改变.三脑室底造瘘术后中脑导水管脑脊液流动不规则,循环减慢.12例患儿术后幕上脑室均较术前缩小,其中8例分别于术后半年及术后1年复查见脑室进一步缩小.结论 MRI相位对比电影法为脑积水患儿行三脑室底造瘘术提供可靠的影像学观察手段,可以作为评价三脑室底造瘘术疗效的有效方法.  相似文献   

7.
目的:评价放射性核素脑脊液显像临床应用价值。材料和方法:对190例核素脑脊液显像的随访病史,部分结合CT和(或)MRI进行回顾性图像分析。结果:交通性脑积水,脑池显像均可见脑室返流明显;正常脑压脑积水,示踪剂缓慢上升到大脑凸面,上矢状窦放射性分布少,即使伴脑室返流,但其程度较轻。脑脊液漏诊断的灵敏度在持续性、间歇性、可疑或无明显脑脊液鼻漏三组中分别为100%(19/9),90%(27/30)及71%(17/24)。其他,脊髓空洞症12例中无阳性发现4例,脑脊液吸收缓慢5例,脊髓段有放射性缺损区3例。颅内压增高21例中脑脊液吸收缓慢9例,吸收正常12例。脑室分流术后11例,放射性核素分流显像可以显示分流管是否畅通。本组与脑脊液相通的蛛网膜囊肿5例均能显示。结论:脑池显像有助于正常脑压脑积水的诊断,及估测手术预后;结合棉拭放射性计数测定,是诊断脑脊液漏有效而灵敏的方法。还可用于脑室分流术后随访、脊髓空洞症与蛛网膜下腔相交通的蛛网膜囊肿等的诊断。  相似文献   

8.
目的探讨运用MRI监测脑脊液循环动力学异常在外伤性脑静脉窦血栓形成临床诊治中的价值。方法对75例脑外伤后临床颅脑血流动力学异常患者及健康志愿者40例,采用MRI 2D-PC cine法序列,以编码流速20cm/s,于颈1~2椎间隙水平测量患者的脑脊液流速、流量,在其接受尿激酶治疗过程中进行随访复查,并与腰穿脑脊液压力进行对照分析。结果颈1~2椎间隙水平脑脊液流动在一个心动周期内均表现为近似于正弦曲线的双向流动,脑外伤组治疗前收缩期、舒张期脑脊液峰值流速、流量均高于正常人群(P<0.05)。经尿激酶治疗后68例患者脑脊液压力恢复正常,其脑脊液收缩期、舒张期脑脊液峰值流速、流量均较治疗前降低(P<0.05)。脑脊液流速与脑脊液压力呈正相关(r=0.805,P<0.05),脑脊液向下净流量与脑脊液压力呈正相关(r=0.794,P<0.05)。结论静脉窦血栓形成前患者脑脊液循环动力学会发生相应改变,磁共振PC-cine法可以早期检测出其循环动力学改变,对脑外伤后患者颅内压改变的监测及预后评价有重要指导意义。  相似文献   

9.
MRI增强FLAIR在脑肿瘤及脑膜病变诊断中的应用   总被引:1,自引:1,他引:0  
常规MRI增强扫描SE T1WI在中枢神经系统疾病的诊断中发挥着非常重要的作用,但存在着一定的限度,如对位于脑表面和脑室旁病变的显示有时有一定的困难。液体衰减反转恢复(fluid—attenuated inversion recovery,FLAIR)序列通过抑制正常脑脊液信号,突出病变组织的长T2信号,增加了病灶与周围组织之间的对比,在脑梗死、颅内感染、蛛网膜下腔病变等疾病的诊断中得到了广泛应用,  相似文献   

10.
急性蛛网膜下腔出血的低场强MRI诊断   总被引:3,自引:0,他引:3  
目的探讨低场强MRI诊断急性蛛网膜下腔出血的价值。材料与方法对80例临床疑诊急性蛛网膜下腔出血的病人行MR检查,扫描机为ASM—015p,采用SE序列,参数T2WI≤TR2000/TE100ms,所有病例分别经腰穿、手术或治疗后复查证实,并与化脓性脑膜炎、结核性脑膜炎等脑脊液蛋白量增高的疾病进行了鉴别,与脑出血破入脑室或溢入蛛阿膜下腔者进行对照。结果本组病例在低场强MRI条件下于病变区脑沟(裂池)等蛛网膜下腔T2WI均出现异常高亮脑脊液信号。探其原因为蛛网膜下腔出血可延长T2值。脑脊液蛋白含量高的其它疾病不出现异常高亮信号。结论低场强磁共振成像对急性蛛网膜下腔出血有较大的诊断价值。  相似文献   

11.
12.
A 39‐year‐old female patient with thoracic syringomyelia underwent routine magnetic resonance imaging (MRI) and 3 T MRI to investigate the value of retrospectively cardiac‐gated cine steady‐state free precession (SSFP) MRI in the preoperative and postoperative diagnosis of arachnoid membranes in the spinal subarachnoid space. Therefore, 3T MRI included sagittal and transverse retrospectively cardiac‐gated cine balanced fast‐field echo (balanced‐FFE) sequences both preoperatively and after microsurgical lysis of arachnoid adhesions and expansive duraplasty. Arachnoid membranes were detected and this result was correlated with intraoperative findings and the results of routine cardiac‐gated phase‐contrast cerebrospinal fluid (CSF) flow MRI. Retrospectively cardiac‐gated cine SSFP MRI enabled imaging of arachnoid membranes with high spatial resolution and sufficient contrast to delineate them from hyperintense CSF preoperatively and postoperatively. The images were largely unaffected by artifacts. Surgery confirmed the presence of arachnoid adhesions in the upper thoracic spine. Not all arachnoid membranes that were seen on cine balanced‐FFE sequences caused significant spinal CSF flow blockages in cardiac‐gated phase‐contrast CSF flow studies. In conclusion, retrospectively cardiac‐gated cine SSFP MRI may become a valuable tool for the preoperative detection of arachnoid adhesions and the postoperative evaluation of microsurgical adhesiolysis in patients with idiopathic syringomyelia. J. Magn. Reson. Imaging 2010. © 2010 Wiley‐Liss, Inc.  相似文献   

13.
MR相位对比电影法在蛛网膜囊肿诊断中应用价值初探   总被引:2,自引:0,他引:2  
目的:评价磁共振相位对比电影法在蛛网膜囊肿与蛛网膜下腔扩大及囊肿与邻近脑池是否相通的诊断价值。材料和方法:运用磁共振相位对比电影法和流动分析软件对21例影像学疑为蛛网膜囊肿或蛛网膜下腔扩大患者进行检查,并分析其相位幅度图像形态及博动情况,测定相应病变区在相位速度图上的搏动强度。结果:蛛网膜囊肿在相位幅度图上可不清楚显示囊肿与邻近脑池相分隔:同时可显示囊肿内搏动幅度。囊肿内反向流动信号及喷射信号改变,提示与邻近蛛网膜腔相通。而在四脑室扩大者,相位幅度图未见明显囊腔,可见与导水管相通。结论:磁共振相位对比电影法对显示不同部位颅内蛛网膜囊肿的形态、与邻近蛛网膜下腔结构鉴别及了解囊肿内搏动情况判断与邻近脑池是否交通有重要价值。  相似文献   

14.
AIM: To compare the qualitative assessment of cerebrospinal fluid (CSF) flow using a SPAMM (spatial modulation of magnetization) technique with cine phase contrast images (cine PC) and fast spin echo (FSE) T2-weighted images. MATERIALS AND METHODS: SPAMM, PC and T2-weighted sequences were performed on 22 occasions in 19 patients. Eleven of the studies were performed following a neuroendoscopic third ventriculostomy (NTV), and in these cases, the success of the NTV was determined by clinical follow-up. Two observers used consensus to grade the presence of CSF flow at nine different sites for each study. RESULTS: At 14 of the 178 matched sites, which could be assessed by both SPAMM and cine PC, SPAMM CSF flow grade was higher than that of cine PC. At a further 14/178 matched sites, the cine PC grade was higher than that of SPAMM. There was definite CSF flow at 113/182 (62%) of all the cine PC sites assessed, and 110/181 (61%) of all SPAMM sites assessed whilst 108/198 (54%) of FSE T2-weighted image sites demonstrated flow voids. Cine PC grades were higher than SPAMM at the cerebral aqueduct (P < 0.05, Wilcoxon sign rank test). Definite CSF flow within the anterior third ventricle was present in 4/5 (SPAMM) and 3/5 (cine PC) successful NTVs, 0/2 (SPAMM and cine PC) unsuccessful NTVs and 1/10 (SPAMM and cine PC) patients without NTV. CONCLUSION: SPAMM provides a comparable assessment of intracranial CSF flow to that of cine phase contrast imaging at all CSF sites except the cerebral aqueduct.  相似文献   

15.
BACKGROUND AND PURPOSE: The demonstration of communication between arachnoid cysts (ACs) and the adjacent subarachnoid space is a prerequisite for their proper management. CT cisternography (CTC) is the conventional method for functional evaluation of ACs. The sensitivity of MR imaging to CSF flow has been demonstrated, but reports of the clinical usefulness of MR CSF flow techniques in this application are limited. The purpose of our study was to prospectively evaluate the accuracy of MR CSF flow study as an alternative to CTC in this setting. METHODS: MR CSF flow study with retrospective ECG-gated 2D, fast low-angle shot, phase-contrast (PC), cine gradient-echo sequence was performed in 39 patients with an intracranial AC. Results were compared with intraoperative and CTC findings. RESULTS: PC cine MR imaging results were compatible with operative or CTC findings in 36 (92.3%) of 39 patients. Twenty-four cysts were noncommunicating, and 15 were communicating. Three cysts were evaluated as being noncommunicating on PC cine MR imaging (false-negative) but demonstrated contrast enhancement on CTC. No false-positive diagnoses occurred. All cysts regarded as being communicating on PC cine MR imaging were also found to be communicating on both confirmation methods. CONCLUSION: MR CSF flow imaging with a PC cine sequence can be incorporated in the imaging work-up of ACs. This is a reliable alternative to invasive CTC for the functional evaluation of ACs.  相似文献   

16.
Summary Motion of the cerebrospinal fluid (CSF) in and around the brain and spinal cord was examined in healthy subjects and in a number of patients with abnormalities of the CSF circulation. The pulsatile motion of the CSF was determined by spin echo phase (velocity) imaging, sometimes in combination with gradient echo phase contrast cine. Differences in flow patterns across CSF spaces were observed: flow reversal in the cerebellomedullary cistern and lumbar area relative to cervical CSF, and in the posterior versus the anterior subarachnoid space in the spinal canal. Flow communication was demonstrated in known communicating cysts or cavities. Differences in flow were also noted across spinal narrowing or block, and across the walls of a variety of cystic lesions in the brain and spinal cord. MR phase imaging of CSF flow provides pathophysiological information of potential clinical importance for the assessment of diseases affecting the CSF circulation.  相似文献   

17.
D R Enzmann  N J Pelc 《Radiology》1991,178(2):467-474
A phase-contrast cine magnetic resonance (MR) imaging technique was used to study normal dynamics of cerebrospinal fluid (CSF) in 10 healthy volunteers and four patients with normal MR images. This pulse sequence yielded 16 quantitative flow-encoded images per cardiac cycle (peripheral gating). Flow encoding depicted craniocaudal flow as high signal intensity and caudo-cranial flow as low signal intensity. Sagittal and axial images of the head, cervical spine, and lumbar spine were obtained, and strategic sites were analyzed for quantitative CSF flow. The onset of CSF systole in the subarachnoid space was synchronous with the onset of systole in the carotid artery. CSF systole and diastole at the foramen of Monro and aqueduct were essentially simultaneous. The systolic and diastolic components were different in the subarachnoid space, where systole occupied approximately 40% and diastole 60% of the cardiac cycle, compared with the ventricular system, where they were equal. This difference results in systole in the intracranial and spinal subarachnoid spaces preceding that in the ventricular system; the same is true for diastole. The fourth ventricle and cisterna magna serve as mixing chambers. The high-velocity flow in the cervical spine and essentially no flow in the distal lumbar sac indicate that a portion of the capacitance necessary in this essentially closed system resides in the distal spinal canal.  相似文献   

18.
目的应用磁共振电影相位对比方法定量研究活体颈椎管内蛛网膜下腔脑脊液腹侧和后外侧运动的区别。资料与方法无任何颅内及椎管内病变的健康志愿者80例,应用GEsigna EXCITE3.0T HD磁共振扫描仪分别于颈2~7椎间盘水平行磁共振电影相位对比法扫描,获得每一个椎间盘水平一个心动周期内不同时相的脑脊液流速与流向,分别测量腹侧、右后侧及左后侧峰值流速、峰值流量。结果颈椎管内每一个水平腹侧峰值流速、峰值流量明显大于右后侧、左后侧峰值流速、峰值流量(P<0.05)。颈椎管内不同椎间盘水平的腹侧、右后侧及左后侧峰值流速、峰值流量没有显著性差异。结论应用磁共振相位对比法测量颈椎管内蛛网膜下腔脑脊液流速发现椎管内腹侧峰值流速、峰值流量明显大于右后侧、左后侧峰值流速、峰值流量。椎管内腹侧脑脊液循环动力明显大于两后外侧脑脊液循环动力。  相似文献   

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