扩散系数值在脑星形细胞肿瘤病理学分级中的应用

目的探讨扩散系数值对脑星形细胞肿瘤病理学分级的应用价值。方法对56例脑星形细胞肿瘤进行扩散加权成像（DWI）检查，分别测量肿瘤实质部分、瘤周水肿区、瘤周T1WI正常表现白质区（瘤周白质区）、瘤体镜面对侧正常白质区及瘤周镜面对侧正常白质区的表观扩散系数（ADC）值和指数扩散系数（EDC）值，并计算肿瘤实质部分、瘤周水肿区、瘤周白质区的相对表观扩散系数（rADC）值和相对指数扩散系数（rEDC）值。分析各测量区的扩散系数值与肿瘤病理学分级的关系。结果56例脑星形细胞肿瘤经手术病理证实，低级星形细胞瘤35例（Ⅰ、Ⅱ级），间变性星形细胞瘤8例（Ⅲ级），胶质母细胞瘤13例（Ⅳ级）。低级星形细胞瘤、间变性星形细胞瘤和胶质母细胞瘤肿瘤实质部分的ADC值分别为（1．44±0．26）×10^-3、（0．98±0．22）×10^-3和（0．83±0．15）×10^-3mm^2／s，rADC值分别为（1．91±0．39）％、（1．34±0．33）％和（1．06±0．20）％，EDC值分别为0．26±0．11、0．39±0．09和0．44±0．07，rEDC值分别为（0．55±0．20）％、（0．81±0．19）％和（0．98±0．16）％，各指标间差异均有统计学意义（F值分别为36．189、31．756、19．623和24．760，P值均为0．000）。高级星形细胞瘤（间变性星形细胞瘤和胶质母细胞瘤）的肿瘤实质部分的ADC值和rADC值分别为（0．89±0．19）×10^-3mm^2／s和（1．17±0．28）％，明显低于低级星形细胞瘤（t值分别为8．332和7．620，P值均为0．000），EDC值和rEDC值分别为0．42±0．08和（0．91±0．18）％，明显高于低级星形细胞瘤（t值分别为-6．082和-6．776，P值均为0．000）。以低级星形细胞瘤实质部分的rADC值的下限（1．52％）作为判断低、高级别星形细胞瘤阈值的准确性为89．3％。结论肿瘤实质部分的扩散系数值对脑星形细胞肿瘤的病理学分级准确性较高，尤以rADC值为佳。     

3．0T弥散张量成像FA值和ADC值在颅脑恶性星形细胞瘤中的运用

目的：探讨磁共振弥散张量成像FA值和ADC值在颅脑恶性星形细胞瘤中的应用价值。方法：收集经手术及组织病理学证实的恶性星形细胞瘤患者14例,术前行常规MRI平扫、DTI检查、增强扫描及1H-MRS检查,工作站自动生成各向异性指数图（FA图）及表观弥散系数图（ADC图）,定义肿瘤实质区为最高Cho／Cr和Cho／NAA比值、异常强化、T2WI信号异常区;定义瘤体边缘为Cho／Cr和Cho／NAA比值异常、无强化、T2WI信号异常区;定义瘤周水肿区为正常MRS表现、无强化、T2WI信号异常区;定义正常白质区为正常MRS表现、无强化、T2WI信号正常区（肿瘤同侧或对侧）;分别测量上述区域的FA1—4值、ADC1—4值,分析比较上述4个区FA值、ADC值有无统计学差异。结果：肿瘤实质区、瘤体边缘、瘤周水肿区及正常白质区平均FA值为FA1：0．1822±0．0583,FA2：0．2947±0．0786,FA3：0．1769±0．0942,FA4：0．6668±0．0817。肿瘤实质区、瘤体边缘、瘤周水肿区与正常自质区比较差异有高度显著性（P=0．000）,瘤体边缘与肿瘤实质区、瘤周水肿区之间差异有高度显著性（P〈0．005）,肿瘤实质区与瘤周水肿区差异无显著性（P〉0．05）;平均ADC值为ADC1：11．132±4．101,ADC2：11．175±2．983,ADCB：14．939±2．857,ADCA：7．265±0．914（单位10^-3mm^2／s）。瘤体实质部、肿瘤边缘及瘤周水肿区与正常脑白质区ADC值差异有高度显著性（P〈0．005）;瘤体实质部、肿瘤边缘与瘤周水肿区差异有高度显著性（P〈0．005）;而瘤体实质部与肿瘤边缘差异无显著性（P〉0．05）。结论：FA值和ADC值对高级别星形细胞瘤浸润范围的划定有重要价值。     

MRI DTI联合血氧水平依赖功能成像在星形细胞瘤术前的研究

目的探讨3.0T磁共振弥散张量成像(DTI)技术联合功能磁共振成像(fMRI)在星形细胞瘤与邻近脑白质纤维束解剖关系术前计划中的作用。方法对22例星形细胞瘤患者术前行常规MRI平扫,增强扫描及DTI技术fMRI检查,原始数据采集后进行图像分析处理,分别获得各项异性图(FA图),彩色编码张量图及脑白质纤维束图,并测定肿瘤的病灶区表观弥散系数(ADC值)及灶周水肿区各项异性分数(FA值)。分析肿瘤与相邻脑白质解剖关系,并对患者手术前后的临床症状进行评价。结果不同级别星形细胞瘤的肿瘤病灶区和灶周水肿区与正常白质区的ADC值和FA值存在差异,有统计学意义(P0.05﹚。白质纤维束可见受压、移位、浸润及破坏三种改变。4例Ⅰ~Ⅱ级星形细胞瘤推移相邻脑白质纤维束;8例Ⅱ~Ⅲ级星形细胞瘤侵润脑白质;10例Ⅲ~Ⅳ级星形细胞瘤破坏相邻脑白质纤维束。DTI图可以清晰显示运动区锥体束形态变化及与肿瘤之间的关系,在此基础上指导手术,效果满意。结论磁共振DTI技术联合fMRI是目前唯一在活体无创、三维清晰星形细胞瘤与周围白质纤维束的关系,由于二者的联合应用不仅能够显示大脑重要功能激活区在病理情况下的移位和改变,同时还能显示肿瘤与重要功能区和白质纤维束结构的关系,具有重要意义。     

脑星形胶质细胞瘤周围区域的磁共振DTI研究

目的：采用扩散张量成像（DTI）技术研究脑星形胶质细胞瘤周围区域的细微结构改变,探讨其确定肿瘤边界的价值。方法：将28例经手术病理证实的星形胶质细胞瘤患者分为低度恶性星形细胞瘤和恶性胶质瘤两组。利用DTI检测肿瘤区、肿瘤周围区和健侧脑组织区,计算各向异性（FA）和平均扩散系数（ADC）及脑白质纤维束的情况。结果：28例星形胶质细胞瘤的3个不同区域DTI数值有显著性差异。周围区域DTI各值的均数在低度恶性和恶性胶质瘤之间进行比较,ADC、FA值的差异均有统计学意义。FA图显示低度恶性星形胶质细胞瘤多以推移周围邻近白质为主,与邻近白质边界清楚,而恶性胶质瘤组则以破坏与浸润白质束为主,边界相对模糊。结论：应用DTI成像可能对确定星形胶质细胞瘤的边界具有一定的临床意义。     

MR扩散加权成像鉴别脑结核瘤及高级星形细胞瘤和脑转移瘤的价值

目的探讨MR扩散加权成像（DWI）在脑结核瘤、高级星形细胞瘤和脑转移瘤鉴别诊断中的价值。方法14例脑结核瘤、15例脑高级星形细胞瘤和21例脑转移瘤患者，在术前或接受治疗前行常规MRI和DWI。测量并计算3种疾病瘤体、瘤周围水肿带的平均表观扩散系数（ADC）值和病灶与对侧相应部位正常脑白质区ADC值的比值（rADC值）。结果脑结核瘤瘤体平均ADC值和rADC值分别为（1．2±0．2）×10^-3mm^2·s^-1和1．6±0．3，高级星形细胞瘤瘤体平均ADC值和rADC值分别为（0．8±0．1）×10^-3mm^2·s^-1和1．1±0．1，转移瘤瘤体平均ADC值和rADC值分别为（0．8±0．1）×10^-3mm^2·s^-1和1．0±0．2。3种疾病瘤体平均ADC值（F=33．57，P〈0．01）之间和rADC值（F=33．27，P〈0．01）之间差异均有统计学意义。脑结核瘤瘤周水肿带平均ADC值和rADC值分别为（1．8±0．1）×10^-3mm^2·s^-1和2．5±0．2，脑高级星形细胞瘤瘤周水肿带平均ADC值和rADC值分别为（1．4±0．2）×10^-3mm^2·s^-1和1．8±0．3，脑转移瘤瘤周水肿带平均ADC值和rADC值分别为（1．9±0．2）×10^-3mm^2·s^-1和2．3±0．5。3种疾病瘤周围水肿带平均ADC值（F=23．17，P〈0．01）之间和rADC值（F=5．94，P〈0．01）之间差异均有统计学意义。结论结合MRI、DWI检测方法，根据病灶瘤体和瘤周水肿带的ADC和rADC值可帮助鉴别脑结核瘤、脑高级星形细胞瘤和脑转移瘤。     

脑高级别星形细胞瘤瘤周DTI参数的测定及分析

目的：应用弥散张量成像（DTI）技术探讨脑高级别星形细胞瘤瘤周弥散各向异性特点。方法：25例脑高级别星形细胞瘤术前行DTI扫描,测定瘤周脑实质区及对侧正常脑实质的平均弥散系数（MD）值及各向异性分数（FA）值。并通过弥散张量纤维束成像（DTT）观察病灶与白质纤维束的关系。结果：高级别星形细胞瘤瘤周MD值为1．610±0．23,高于对侧正常脑实质（P〈0．01）。FA值为0．236±0．06,低于对侧正常脑实质（P〈0．01）。结论：DTI能够准确反应脑星形细胞瘤瘤周各向异性特点,DTT能够较为准确显示病灶与白质纤维束的关系。     

腰椎间盘纤维环MR扩散张量成像的临床应用

目的评价MR扩散张量成像（DTI）在椎间盘纤维环病变中的临床应用价值。方法对正常组（10例），腰椎间盘突出（24例）和脱出患者（22例）共56例受检者的腰椎间盘行轴面DTI，后处理成平均扩散系数（DCavg）图、各向异性分数（FA）图和纤维环示踪（FT）图。观察纤维环的形态和完整性，测量正常组和腰椎间盘病变患者纤维环后缘以及FT图发现断裂处的DCavg值和FA值，比较正常组与纤维环后缘未断裂组及缘断裂组的DCavg值和FA值的差异。结果正常组纤维环在DCavg图和FA图上呈连续完整的环形结构，DCavg值和FA值均匀，DCavg值为（0．34±0．13）×10^-9mm^2／s，FA值0．64±0．22，FT图显示纤维环形态完整；纤维环后缘未断裂组的DCavg值为（0．29±0．10）×10^-9mm^2／s，FA值为0．53±0．22，与正常组差异无统计学意义（P〉0．05）；腰椎间盘突出患者中的7例，脱出患者中的9例共16例FT图发现纤维环后缘断裂、不连续，断裂处的DCavg值明显升高（1．01±0．10）×10^-9mm^2／s，FA值则明显降低（0．15±0．03）（P〈0．01）。结论DTI能够无创的显示纤维环的形态和完整性，发现纤维环是否断裂和断裂的位置，是常规MR检查的有效补充。     

DTI多参数值及DTT技术在颅内肿瘤中的应用研究

目的 探讨MR扩散张量成像(DTI)多参数值在脑肿瘤中的诊断和鉴别诊断价值;评价扩散张量纤维柬成像(DTT)在显示脑肿瘤与周围脑白质纤维束关系中的应用.资料与方法 搜集经手术病理证实的星形细胞瘤(低级别、高级别)、脑膜瘤、转移瘤患者资料(低级别星形细胞瘤15例,高级别星形细胞瘤18例,脑膜瘤16例,转移瘤10例)共59例.行常规T_1WI、T_2WI、增强T_1WI及DTI.测量病灶肿瘤实质区、瘤周水肿区、囊变坏死区、水肿邻近正常白质区及对侧正常白质区的平均扩散系数(DCavg)值、部分各向异性分数(FA)值、1-容积比(1-VR)值及相对各向异性(RA)值,分析各测量值在肿瘤的诊断及良恶性鉴别诊断中的作用.利用DTI数据进行DTT重组病变周围脑白质纤维束,观察肿瘤与脑白质纤维束的关系.结果 低级别星形细胞瘤、高级别星形细胞瘤、脑膜瘤及转移瘤的肿瘤实体、瘤周水肿区的FA值、1-VR值及RA值差异均具有统计学意义(P<0.05);对侧正常白质区DCavg值、FA值、1-VR值及RA值差异均具有统计学意义(P<0.5).FA图、FA彩色编码图、DTT图均能显示脑白质纤维受累情况,而常规MRI难以显示;脑白质纤维束与脑肿瘤的位置关系可分为四型,即推挤型、水肿型、浸润型和破坏型.低级别星形细胞瘤及脑膜瘤良性肿瘤周围的白质纤维束多呈推挤水肿改变,而高级别星形细胞瘤及转移瘤恶性肿瘤周围的白质纤维束多表现为以浸润破坏为主.结论 DTI较常规MRI能更确切、直观地显示脑内肿瘤与周围脑白质的关系,结合FA值、1-VR值及RA值能为肿瘤的诊断及鉴别诊断提供更多的依据;DTT可以为临床提供更多的肿瘤及其周围白质纤维束的信息,指导术前计划的制定和术后的评估.     

星形细胞瘤各向异性分数值与其内部微结构的相关性分析

目的 探讨MR扩散张量成像（DTI）中各向异性分数（FA）值与星形细胞瘤内部微结构的相关性。方法 对病理证实的14例星形细胞瘤行DTI扫描。原始图像在主机上使用Functool3．0中DTI专用软件进行后处理，得到FA图，记录肿瘤实质区FA值。用生物素箍霉菌抗生物素蛋白-过氧化酶（SP）法对14例病理标本行血管内皮生长因子（VEGF）、CD34染色，记录微血管密度（MVD）、VEGF阳性百分比和细胞密度。对其FA、VEGF阳性百分比、MVD、细胞密度进行Pearson相关分析法分析。结果 FA值随肿瘤级别升高而增高（Ⅰ、Ⅱ级FA为0．102±0．080，Ⅲ级为0．171±0．037，Ⅳ级为0．200±0．021），与肿瘤内VEGF阳性百分比、MVD、细胞密度均呈正相关，r值分别为0．748、0．668、0．625，P值均〈0．05。结论 FA能揭示星形细胞瘤内部微结构状态，有助于鉴别不同级别的星形细胞瘤，为术前精确诊断提供一种新方法。     

成人视放射磁共振DTI和DTT研究及初步临床应用

目的应用MR扩散张量成像（DTI）和扩散张量纤维束示踪成像（DTT）研究正常成人视放射的各向异性程度和视放射纤维束的构象特征及其临床应用价值。资料与方法对30名健康志愿者和34例枕叶病变累及视放射的患者进行MR常规及DTI序列检查,重组FA图和三维彩色编码张量图,分别测量双侧视放射区的部分各向异性（FA）值和平均扩散率（MD）值。采用扩散张量纤维束追踪软件进行视放射纤维束成像。结果彩色编码张量图均清晰显示视放射,正常视放射的FA值分别为左侧0．509±0．027、右侧0．504±0．028,MD值分别为左侧（0．756±0．049）×10^-3mm^2／s和右侧（0．734±0．045）×10^-3mm^2／s,差异均无统计学意义（P〉0．05）。DTT显示的视放射纤维束构像和走行特征符合经典神经解剖学研究。20例枕叶陈旧性梗死患者可见视放射继发Wallerian变性,FA明显降低,MD明显增高;3例脑膜瘤患者视放射完整无破坏,呈被推移改变,FA轻度降低,MD轻度增高;3例胶质瘤、1例淋巴瘤、6例转移瘤和1例结核性脑脓肿均显示视放射被破坏、中断,其各向异性消失。结论DTI、DTT可清晰显示视放射纤维束生理和病理条件下的各向异性特征,对提高视放射病变的显示和诊断具有重要意义,为了解视功能与视放射之间的关系提供了新的研究手段。     

DSA功能性参数的提取与利用

本文介绍了在临床实际中利用功能性参数，对冠状动脉ＤＳＡ心肌血流灌注成像、冠状动脉血流量测定、左心室功能测定、肺动脉高压程度的评价等项目研究结果。重点讨论了提取ＤＳＡ功能性参数的一般方法，认为功能性参数在现代影像诊断学中的作用是对疾病做出程度、定量、动态及功能诊断。     

Current Status of Optical Imaging for Evaluating Lymph Nodes and Lymphatic System

Optical imaging techniques use visual and near infrared rays. Despite their considerably poor penetration depth, they are widely used due to their safe and intuitive properties and potential for intraoperative usage. Optical imaging techniques have been actively investigated for clinical imaging of lymph nodes and lymphatic system. This article summarizes a variety of optical tracers and techniques used for lymph node and lymphatic imaging, and reviews their clinical applications. Emerging new optical imaging techniques and their potential are also described.     

Fast imaging of phosphocreatine in the normal human myocardium using a three-dimensional RARE pulse sequence at 4 Tesla

PURPOSE: To investigate the use of a three-dimensional rapid acquisition with relaxation enhancement (RARE) pulse sequence for direct acquisition of phosphocreatine (PCr) images of the human myocardium. MATERIALS AND METHODS: A short elliptical birdcage radiofrequency (RF) body coil was constructed to produce a uniform flip angle throughout the chest cavity. In vivo images using a spectrally-selective RARE sequence with a spatial resolution of 1.2 cm x 1.2 cm x 2.5 cm (4 cm(3)) were acquired in nine minutes and 40 seconds. RESULTS: Scans of phantoms demonstrated excellent spectral selectivity. The signal-to-noise ratio in the myocardium ranged from 12.6 in the anterior wall to 5.3 in the mid septum. CONCLUSION: This study demonstrates that PCr data can be acquired using a three-dimensional RARE sequence with greater spatial and temporal resolution than spectroscopic techniques.     

Molecular imaging programs in the United States: results of a national survey

RATIONALE AND OBJECTIVES: We sought to identify and describe the characteristics of molecular imaging (MI) programs in the United States and to determine the factors considered critical for their future. MATERIALS AND METHODS: In a cross-sectional study, a validated survey was sent to members of the Society of Chairmen in Academic Radiology Departments (SCARD) in the United States, and 26 variables were studied. RESULTS: The response rate was 40.3%; 67.9% of the departments surveyed have an MI program. The main focus of 47.4% of departments is oncology. The number of radiologists working for the department was the only variable found to be significantly positively correlated with (1) number of researchers in the MI program, (2) number of MI modalities available, (3) total number of grants, and (4) having ongoing MI clinical trials. These four variables plus the number of federal grants and the space used by MI programs were independent of the geographical region, hospital size (number of beds), and department size (number of radiological examinations per year). All the MI programs received grants during 2005. Only 16.1% have no alliances with industry. Among all the departments, 82% identified staff training and recruitment as the keys for success; 78.57% considered oncology the most important future application of MI and cancer management the hospital service most affected by MI. CONCLUSION: MI programs are starting to be more widespread throughout the United States, and the trend is for more academic radiology departments to become engaged in MI activities; their development is independent of department characteristics. Radiology departments strongly agreed about the key components for success of MI initiatives and the areas that will be most affected by MI applications.     

Molecular imaging of the lungs

An emerging suite of new imaging techniques offer the ability to monitor and quantify molecular and cellular processes in the lungs noninvasively. These techniques take advantage of dramatic advances in both imaging technology as well as molecular and cell biology. Molecular imaging is being used with increasing regularity in research protocols, and forms of molecular imaging have found their way into the patient care setting (eg, positron emission tomography imaging in cancer). Such techniques will afford the basic scientist as well as the clinician an unprecedented opportunity for in vivo study of the lung biology that drives normal pulmonary physiology as well as pathophysiology.     

Dynamic bioluminescence imaging for quantitative tumour burden assessment using IV or IP administration of <Emphasis Type="SmallCaps">d</Emphasis>-luciferin: effect on intensity,time kinetics and repeatability of photon emission

Introduction In vivo bioluminescence imaging (BLI) is a promising technique for non-invasive tumour imaging. d-luciferin can be administrated intraperitonealy or intravenously. This will influence its availability and, therefore, the bioluminescent signal. The aim of this study is to compare the repeatability of BLI measurement after IV versus IP administration of d-luciferin and assess the correlation between photon emission and histological cell count both in vitro and in vivo. Materials and methods Fluc-positive R1M cells were subcutaneously inoculated in nu/nu mice. Dynamic BLI was performed after IV or IP administration of d-luciferin. Maximal photon emission (PE_max) was calculated. For repeatability assessment, every acquisition was repeated after 4 h and analysed using Bland–Altman method. A second group of animals was serially imaged, alternating IV and IP administration up to 21 days. When mice were killed, PE_max after IV administration was correlated with histological cell number. Results The coefficients of repeatability were 80.2% (IV) versus 95.0% (IP). Time-to-peak is shorter, and its variance lower for IV (p < 0.0001). PE_max was 5.6 times higher for IV. A trend was observed towards lower photon emission per cell in larger tumours. Conclusion IV administration offers better repeatability and better sensitivity when compared to IP. In larger tumours, multiple factors may contribute to underestimation of tumour burden. It might, therefore, be beneficial to test novel therapeutics on small tumours to enable an accurate evaluation of tumour burden. Marleen Keyaerts is a Ph. D. fellow of the Research Foundation—Flanders (Belgium; FWO).     

Phase insensitive preparation of single-shot RARE: Application to diffusion imaging in humans

Although RARE and GRASE can produce single-shot images of excellent quality, their utility has been restricted because preparation of the magnetization with interesting contrast before imaging can cause severe artifacts. These artifacts relate to the strong sensitivity of multiple spin echo sequences to the phase of the prepared magnetization. Modifications of the RARE sequence to eliminate these artifacts are discussed, and an approach that eliminates the artifact producing signals from the very first echo is presented. The approach is applied to diffusion imaging of the human brain in normal volunteers and one patient.     

同一个体3.0T与1.5T乳腺MR扩散加权成像的图像质量比较

目的比较3.0 T与1.5 T MR正常乳腺组织扩散加权成像(DWI)的图像质量,从而评价3.0 T乳腺MRDWI的可行性。方法对44名女性乳腺受检者分别在3.0 T MR与1.5 T MR上行DWI。3.0 T DWI应用选择性水激励(Water excitation)技术行脂肪抑制,1.5 T DWI应用频率选择脂肪饱和(Fatsat)技术行脂肪抑制,b值均为0,1000 s/mm2,其他参数相同。比较3.0 T及1.5 T乳腺MR DWI图像的主观质量评分,测量并计算3.0 T及1.5 T乳腺MR DWI乳腺组织信噪比(SNR)及表观扩散系数(ADC)值,进行统计学分析。结果 3.0 T乳腺MR DWI的图像质量平均评分为(3.07±0.79),主观质量评分达到3分(可以诊断)及以上者为34名,占总检查例数的77.27%。1.5 T乳腺MR DWI的图像质量平均评分为(3.23±0.52),主观质量评分达到3分及以上者为42例,占总检查例数的95.45%。两者比较差异无统计学意义(P=0.1615,>0.05)。3.0 T乳腺MR DWI的乳腺组织SNR为(52.28±19.34),1.5 T乳腺MR DWI的乳腺组织SNR为(49.97±17.99)。3.0 T乳腺MR DWI图像乳腺组织平均SNR略高于1.5 T,但二者差异无统计学意义(P=0.5500,>0.05)。3.0 T MR DWI的平均ADC值为(1.80±0.44)×10-3mm2/s,1.5 T MR DWI的平均ADC值为(1.73±0.32)×10-3 mm2/s,两者比较差异无统计学意义(P=0.0652,>0.05)。结论 DWI可用于3.0 T MR乳腺成像,图像质量可以达到1.5 T MR DWI的效果,且ADC值与1.5 T的ADC值无明显差异。     

Head and neck imaging: the role of CT and MRI

High-resolution computed tomography (CT) and magnetic resonance imaging (MRI) have become indispensable tools for the evaluation of conditions involving the head and neck. Complex anatomic structures and regions, such as the orbit, skull base, paranasal sinuses, deep spaces of the neck, larynx, and lymph nodes, require that the radiologist be familiar with the imaging modalities available and their appropriate applications. The purpose of this article is to review the techniques of CT and MRI and the roles they play in clinical practice, including head and neck disorders.     

MR灌注成像在评价脑内胶质瘤残留或复发方面的价值

目的 用受试者操作特性（ROC）分析方法评价常规MR和灌注成像（PWI）对脑内胶质瘤术后早期残存与复发的诊断价值。资料与方法 回顾性分析经手术与病理证实的脑内胶质瘤86例,其中术后残留或复发50例,均经二次手术证实;其余36例术后随诊18个月以上无复发表现。所有患者均行常规MR／和PWI,获得相对脑血流容积彩图,并计算肿瘤相对血容积比值。采用Windows98版ROCKIT软件进行ROC分析,使用微软Excel2000软件绘制ROC曲线图。结果 86例胶质瘤术后的影像资料经ROC分析显示,常规MR曲线的a值（截距）为0．12,b值（斜率）为0．95,Az为0．5343;结合PWI的方法a值为0．56,b值为1．23,Az为0．6370。两种方法ROC曲线的Az差异有统计学意义（P=0．0001,〈0．01）。在胶质瘤术后残存或复发的诊断方面,结合PWI的MRI诊断方法明显优于常规MRI。结论 在术后早期,对胶质瘤残存与复发的监测方面,常规MR／结合PWI能明显提高特异性和敏感性。