区域性动脉自旋标记技术在缺血性脑血管病灌注评估中的应用进展

区域性动脉自旋标记(territorial arterial spin labeling, tASL)是近年来逐步发展与推广应用的一种新型磁共振脑灌注成像技术, 与全脑灌注影像学成像方法区别在于tASL可选择性标记单支或多支供血动脉, 显示脑实质区域范围内的血流灌注信息, 可用于判定责任供血动脉、评估脑侧支循环的建立状态以及用于围术期的疗效评价等。本文就tASL在缺血性脑血管病方面的临床应用进行综述。     

Influence of inversion time on brain perfusion imaging using aterial spin labeling

目的 探讨不同反转恢复时间(TI)对动脉自旋标记(ASL)技术脑灌注成像的影响.方法13只犬行MR脑T1WI、T2WI和ASL灌注成像检查.ASL序列TI分别取1600、1800、2000和2200 ms,测量并计算不同TI时反转脉冲标记前后图像的磁共振信号强度变化差值(△M),采用方差分析评价不同TI对灌注图像的影响.结果 不同TI的灌注成像对白质灌注的显示有明显差异,但对灰质灌注的显示无明显影响.TI为1600、1800和2200ms时,白质△M分别为20.78±1.16、25.95±1.23和11.40±1.26(P＜0.05).结论 TI参数在一定范围内的改变对ASL成像对脑白质灌注的图像质量影响较大;当TI取1800ms时,ASL序列对犬脑白质的灌注显示较好.     

反转恢复时间对动脉自旋标记技术脑灌注成像的影响

目的探讨不同反转恢复时间(TI)对动脉自旋标记(ASL)技术脑灌注成像的影响。方法 13只犬行MR脑T1WI、T2WI和ASL灌注成像检查。ASL序列TI分别取1600、1800、2000和2200ms,测量并计算不同TI时反转脉冲标记前后图像的磁共振信号强度变化差值(ΔM),采用方差分析评价不同TI对灌注图像的影响。结果不同TI的灌注成像对白质灌注的显示有明显差异,但对灰质灌注的显示无明显影响。TI为1600、1800和2200ms时,白质ΔM分别为20.78±1.16、25.95±1.23和11.40±1.26(P<0.05)。结论 TI参数在一定范围内的改变对ASL成像对脑白质灌注的图像质量影响较大;当TI取1800ms时,ASL序列对犬脑白质的灌注显示较好。     

磁共振动脉自旋标记全脑容积灌注成像对短暂性脑缺血发作的诊断价值

探讨动脉自旋标记全脑容积灌注成像（3D-ASL)对短暂性脑缺血发作(TIA)的诊断价值。对48例临床诊断短暂性脑缺血发作的患者据最后一次发作24 h内行磁共振常规扫描（包含T1WI、T2WI、T2-FLAIR、DWI序列)、磁共振血管成像（3D-TOF-MRA)及3D-ASL扫描,并根据扫描结果对48例短暂性脑缺血发作患者进行分析。常规平扫检出异常14例（29.17%）;3D-MRA检出异常18例(37.50%);3D-ASL检出异常37例(77.09%)。动脉自旋标记全脑容积灌注成像对短暂性脑缺血发作的检出率远高于常规平扫及血管成像,有显著性差异,且简便易行,可以作为诊断短暂性脑缺血发作的常规检查方法予以推广。     

动脉自旋标记灌注成像技术在脑胶质瘤术前评估中的应用

目的探讨动脉自旋标记(ASL)灌注成像技术在脑胶质瘤中的临床应用价值。方法使用3.0T MR成像系统对23例脑胶质瘤患者(术后病理证实高级别胶质瘤14例,低级别胶质瘤9例)术前行常规扫描外,加扫ASL灌注检查,分析不同级别胶质瘤MR灌注表现,测量肿瘤实质部分最大肿瘤血流量(TBFmax)以及对侧白质、灰质、半球的血流量(CBF)。结果在ASL灌注图像中,高级别胶质瘤呈明显的高血流灌注,低级别胶质瘤呈低血流灌注。高、低级胶质瘤TBFmax/对侧白质CBF的比值分别为6.32±2.79、3.00±1.66(P<0.01);TBFmax/对侧灰质CBF的比值分别为1.25±0.66、0.65±0.45(P<0.05);TBFmax/对侧半球CBF的比值分别为4.10±1.92、1.86±1.57(P<0.01)。结论 ASL可用于评估脑胶质瘤的微血管灌注,有助于术前对脑胶质瘤进行分级评判。     

3D-ASL联合3D-TOF MRA评估单侧颈内动脉闭塞后脑灌注状态的应用研究

目的分析磁共振三维动脉自旋标记(3D ASL)联合三维时间飞跃法磁共振血管成像(3D-TOF MRA)技术在评估单侧颈内动脉(ICA)慢性闭塞后脑灌注状态的应用价值。方法回顾性研究2018年1月至2022年3月南京中医药大学连云港附属医院脑病科收治的单侧ICA闭塞患者40例, 其中男24例, 女16例, 年龄(52.4±16.9)岁。均行常规MRI序列、3D ASL及3D-TOF MRA序列检查, 3D ASL标记后延迟时间(PLD)2 525 ms, 依据3D-TOF MRA序列显示有无前交通动脉(ACoA)及后交通动脉(PCoA)开放、大脑前动脉(ACA)及大脑后动脉(PCA)偏侧优势分为侧支循环组(23例)和对照组(17例)。通过脑血流量(CBF)伪彩图分别测量额叶、顶叶、颞叶、脑室旁白质区以及基底节区CBF值。行两独立样本t检验。结果入组患者中, 左侧ICA闭塞22例, 右侧ICA闭塞18例。侧支循环组额叶、顶叶、颞叶、侧脑室旁白质区及基底节区CBF值分别为(42.14±6.75)ml/min×100 g、(41.47±6.91)ml/min×100 g、(42.85±7.14...     

动脉自旋标记灌注成像在缺血性脑血管病中的应用价值(附50例分析)

目的 探讨动脉自旋标记灌注成像(arterial spin labeling,ASL)在缺血性脑血管病中的应用价值.方法 选取我院收治入院的缺血性脑血管病患者50例,均行磁共振成像(magnetic resonance imaging,MRI)、磁共振扩散加权成像(diffusion weighted imaging,DWI)、动态磁敏感对比增强技术(dynamic susceptibility contrast,DSC)、三维动脉自旋标记灌注成像(average search length,ASL)检查,对比不同检查方法的阳性检出率、缺血半暗带面积,在ASL上对比不同部位脑血流量值(cerebral blood flow,CBF)与对侧正常区CBF值.结果 ASL与DWI的阳性检出率均为100.0％,与常规MRI扫描(72.0％)相比,差异有统计学意义(P＜0.05);DSC、ASL两种检查方法的缺血半暗带面积对比差异无统计学意义(t=2.011,P=0.082);ASL检查下男性患者与女性患者各病变部位的CBF值对比无统计学差异(P＞0.05),与对侧正常区相比,明显偏低,存在统计学差异(P＜0.05).结论 ASL在缺血性脑血管病病灶检出及血流灌注提示方面的应用价值较高,值得进一步推广使用.     

交叉性小脑神经机能联系不能的动脉自旋标记灌注成像分析

目的 通过3.0T磁共振三维动脉自旋标记成像(ASL)评估不同期幕上脑梗死体积(CIv)、梗死区灌注异常程度与交叉性小脑神经机能联系不能(CCD)的关系.方法 收集单侧幕上脑梗死患者52例,其中急性期13例、亚急性期26例、慢性期13例.所有患者进行磁共振常规扫描、弥散加权成像(DWI)、磁共振血管成像(MRA)及ASL检查,记录并计算幕上CIV、幕上梗死区脑灌注与镜像区正常脑组织灌注差值和幕下小脑不对称指数(AI).以AI＞ 10％诊断CCD阳性,分析CCD阳性组与阴性组患者不同期幕上CIV及梗死区灌注异常程度的差异,分析CCD阳性组患者不同期幕上CIV、梗死区灌注异常程度与幕下小脑AI的相关性.结果 急性期、亚急性期和慢性期脑梗死患者CCD发生率分别为46.2％、42.3％、61.5％.不同期CCD阳性组患者幕上CIV均高于阴性组患者,但差异无统计学意义(P＞0.05).急性期CCD阳性组患者幕上梗死区灌注降低程度与CCD阴性组患者差异有统计学意义(P=0.015),亚急性期和慢性期患者幕上梗死区灌注降低程度与阴性组患者差异无统计学意义(P＞0.05).CCD阳性组患者各期幕上CIV、梗死程度与幕下小脑AI无明显相关性.结论 急性期幕上脑梗死区灌注降低程度与CCD发生有关,但是与CCD的严重程度不具有相关性.不同期幕上CIV与CCD的发生无明显关系.     

大脑中动脉M1段闭塞后动脉偏侧优势和动脉内高信号对比研究

目的:探讨单侧大脑中动脉（MCA）M1段闭塞后,磁共振血管成像（MRA）提示同侧大脑前动脉（ACA）及大脑后动脉（PCA）偏侧优势与三维动脉自旋标记（3D ASL）成像提示动脉内高信号之间的相关性。方法:收集2018年1月至2021年7月经MRA提示单侧MCA M1段闭塞患者60例,男34例,女26例,年龄33～78（...     

磁共振灌注动脉自旋标记在脑小血管病相关认知障碍中的应用研究进展

认知障碍是脑小血管病(cerebral small vessel disease, CSVD)最主要的临床表现，其特点表现为早期症状不典型、不易诊察。动脉自旋标记(arterial spin labeling, ASL)技术能灵敏反映脑组织血流灌注量变化，在研究CSVD相关认知障碍的临床诊断与评估等方面起重要作用。现就CSVD相关认知障碍的研究现状以及磁共振灌注ASL在脑小血管疾病认知障碍中的应用进展做一综述，旨在探讨ASL在CSVD相关认知障碍领域的研究现状与临床价值。     

Effects on resting cerebral blood flow and functional connectivity induced by metoclopramide: a perfusion MRI study in healthy volunteers

BACKGROUND AND PURPOSE The substituted benzamide, metoclopramide, is a dopamine receptor antagonist and is widely prescribed in the symptomatic treatment of nausea and vomiting, although it can cause adverse motor and non-motor side effects. The effects of metoclopramide on brain metabolism have not been investigated to date. EXPERIMENTAL APPROACH To determine the effects of metoclopramide on brain function, cerebral perfusion changes after a single oral dose were assessed in healthy volunteers using magnetic resonance imaging (MRI) techniques. Arterial spin labelling (ASL) perfusion MRI was used to measure cerebral blood flow before and after metoclopramide. Blood haemodynamics in the vertebral and internal carotid arteries were evaluated using phase-contrast MRI. KEY RESULTS Metoclopramide altered haemodynamics in the carotid arteries and the cerebral perfusion. Perfusion increased bilaterally in the putamen, consistent with antagonism of dopamine D(2) receptors by metoclopramide and possibly related to its motor side effects. In contrast, reduced perfusion was observed in the insular cortices and anterior temporal lobes. In addition, functional connectivity between the insular cortex and the dorsolateral prefrontal cortex was decreased. These cortical changes affecting neural circuits between high-order association areas may underlie certain neuropsychiatric conditions occasionally reported after metoclopramide administration. CONCLUSIONS AND IMPLICATIONS The present results show the sensitivity of ASL to detect small changes in regional blood flow, closely related to brain function, after a single pharmacological challenge, highlighting the potential of this technique for human pharmacological studies.     

Sex differences in resting state neural networks of nicotine-dependent cigarette smokers

Although several sex differences in nicotine dependence have been identified, the neural mechanisms underlying these sex differences are not clear. The present study examines sex differences in resting-state brain activity using an arterial spin labeling (ASL) perfusion imaging technique. Fifty-one (31 males) sated nicotine-dependent cigarette smokers underwent perfusion functional magnetic resonance imaging during the resting state. Using functionally defined hippocampus/amygdala (HIP/AMY) seed regions, we observed sex differences in correlation strength between the HIP/AMY and the bilateral anterior insula, rostral anterior cingulate cortex, and inferior parietal lobule with females showing stronger functional coupling than males. This pattern of synchronous variations in dynamic cerebral blood flow is consistent with recent models of nicotine dependence, and as such, our findings provide a novel perspective on the neural mechanisms that may contribute to sex differences in nicotine dependence.     

Olanzapine exposure diminishes perfusion and decreases volume of sensorimotor cortex in rats

BackgroundOlanzapine is a frequently used atypical antipsychotic drug known to exert structural brain alterations in animals. This study investigated whether chronic olanzapine exposure alters regional blood brain perfusion assessed by Arterial Spin Labelling (ASL) magnetic resonance imaging (MRI) in a validated model of olanzapine-induced metabolic disturbances. An effect of acute olanzapine exposure on brain perfusion was also assessed for comparison.MethodsAdult Sprague-Dawley female rats were treated by intramuscular depot olanzapine injections (100 mg/kg every 14 days) or vehicle for 8 weeks. ASL scanning was performed on a 9.4 T Bruker BioSpec 94/30USR scanner under isoflurane anesthesia. Serum samples were used to assay leptin and TNF-α level while brains were sliced for histology. Another group received only one non-depot intraperitoneal dose of olanzapine (7 mg/kg) during MRI scanning, thus exposing its acute effect on brain perfusion.ResultsBoth acute and chronic dosing of olanzapine resulted in decreased perfusion in the sensorimotor cortex, while no effect was observed in the piriform cortex or hippocampus. Furthermore, in the chronically treated group decreased cortex volume was observed. Chronic olanzapine dosing led to increased body weight, adipose tissue mass and leptin level, confirming its expected metabolic effects.ConclusionThis study demonstrates region-specific decreases in blood perfusion associated with olanzapine exposure present already after the first dose. These findings extend our understanding of olanzapine-induced functional and structural brain changes.     

320层CT灌注成像评估窦旁脑膜瘤瘤周水肿的价值

目的探讨320层CT灌注成像在窦旁脑膜瘤瘤周水肿中的价值。方法对18例窦旁脑膜瘤伴瘤周水肿患者进行CT灌注成像,计算并比较窦旁脑膜瘤瘤周水肿区及对侧正常脑组织的脑血流量(CBF)、脑血容量(CBV)、平均通过时间(MTT))。结果窦旁脑膜瘤瘤周水肿区的CBF和CBV明显低于对侧正常脑组织(P<0.05)。但窦旁脑膜瘤瘤周水肿区的MTT与正常脑组织比较差异无统计学意义(P>0.05)。结论窦旁脑膜瘤瘤周水肿区的CBV和CBF明显降低;CT灌注成像能定量脑膜瘤瘤周水肿的血流灌注状况。     

Imaging of intrarenal haemodynamics and oxygen metabolism

相似文献   

术前动脉灌注化疗治疗乳腺癌56例

目的 评价术前有针对性乳腺癌供血动脉灌注化疗对乳腺癌的短期治疗效果。方法对经活检证实56例乳腺癌患者，手术切除前4周，应用介入技术选择插管至患侧锁骨下动脉、胸廓内动脉及胸外侧动脉内，根据肿瘤供血情况及肿块所处乳腺部位用ADM、MMC、5-FU对乳腺癌供血区及其转移途径之淋巴结供血区有针对性地分配化疗药量进行灌注化疗。结果乳腺由多支动脉供血，本组56例乳腺癌患者中，78％肿块在DSA造影中可见肿瘤血管及肿瘤染色，临床有效率84％，术后病理：20％病例提示肿物大片凝固坏死，未见癌细胞浸润，80％病例提示肿物灶性凝固坏死，乳腺导管及间质内见残存少量癌细胞。结论乳腺癌血供与其肿块所在乳腺部位有关，乳腺癌供血动脉化疗药物灌注是可行的、有效的乳腺癌辅助治疗方法。