磁共振波谱对原发性癫痫患者海马病变的诊断价值

目的 探讨磁共振波谱(MRS)对原发性癫痫患者海马病变的诊断价值.方法 对38例原发性癫痫患者(癫痫组)和30例健康志愿者(正常对照组进行EEG、MRI和MRS检查.采用MRS检测双侧海马N-乙酰天门冬氨酸(NAA)、肌酸复合物(Cr)和胆碱复合物(Cho)的水平.结果 正常对照组EEG、MRI、MRS检查均无异常.癫痫组EEG检查发现痫样放电30例(78.9％);MRI检查发现海马异常15例(39.5％),其中双侧异常10例、单侧异常5例;MRS检查发现海马异常35例(92.1％),其中双侧异常30例、单侧异常5例.癫痫组病侧海马Cho/Cr和Cho/NAA显著高于对侧海马及正常对照组(均P＜ 0.001),NAA/(Cho+Cr)显著低于对侧海马及正常对照组(均P＜0.001).癫痫组病侧海马头部的NAA/(Cho+ Cr)明显低于体部及尾部(均P＜0.001).结论 MRS可提高原发性癫痫患者海马病变的检出率,且可显示海马的生化改变,对原发性癫痫具有很高的诊断价值.     

难治性癫痫致痫灶的术前常用评估方法及有效性分析

目的分析难治性癫痫致痫灶的术前常用评估方法的定位价值,为术前评估方法的合理选择提供依据。方法回顾性分析2011年9月至2013年10月手术治疗的76例难治性癫痫的临床资料,分别评估症状学、头皮及颅内脑电图、影像学检查在术前致痫灶定位中的有效性。结果分别有88.1%、44.7%、82.9%的病人通过临床症状学、头颅MRI、头皮脑电图监测可获得一定价值的定侧或定位信息;在难治性颞叶内侧癫痫中,手术侧海马头M:RS NAA/(Cr+Cho)比值较对侧明显降低(P0.05),当双侧海马头NAA/(Cr+Cho)比值的不对称指数%0.08时,判断NAA/(Cr+Cho)比值较小一侧为致痫灶所在侧别的准确率更高。19例头颅MRI阴性并接受PET-CT检查的病人中,68.4%可获得一定价值的定侧或定位信息;仍有68.4%的病例需要通过颅内脑电图监测来进一步明确致痫灶的部位及范围。结论临床症状学分析及头皮脑电图监测对颅内电极的植入及致痫灶切除术有着重要的参考价值;MRI及MRS检查在难治性颞叶内侧癫痫的术前评估中存在一定的参考价值;PET-CT对于头颅MRI检查阴性的病例在癫痫手术中仍有着一定的参考价值;颅内脑电图监测对于致痫灶的判断及癫痫手术切除范围的限定仍有着决定性的意义。     

氢质子磁共振波谱在颞叶癫痫患者中的应用研究

目的探讨氢质子磁共振波谱在颞叶癫痫患者中应用价值。方法选取颞叶癫痫患者30例作为研究对象,30例健康志愿者为对照组。先行MRI常规平扫,而后选择感兴趣区进行H1-MRS检查。观察颞叶癫痫患者MRI平扫图像特征,从形态、信号及与邻近组织关系进行分析。比较两组患者NAA/(Cho+Cr)、NAA/Cr、Cho/Cr的差异。结果 30例患者中,5例患者患侧海马体积缩小,同侧侧脑室颞角扩大;7例患者患侧海马体积略增大或无明显变化,T2FLAIR序列信号略增高;18例患者海马形态及信号未见异常,双侧侧脑室颞角对称。观察组患侧NAA/(Cho+Cr)显著低于对照组,NAA/Cr显著低于对照组,Cho/Cr显著高于对照组,差异均具有统计学意义(P0.05)。结论在颞叶癫痫的诊断中,MRS可以显示NAA、Cho及Cr代谢物的变化,具有一定的应用价值。     

颞叶癫痫患者磁共振质子波谱与脑电图的关系

目的 探讨颞叶癫痫患者的磁共振质子波谱(1H-MRS)与动态脑电图和MRI之间的关系.方法 对入组的38例颞叶癫痫患者均行1H-MRS、常规MRI和动态脑电图检测,以16例健康儿童作为对照.根据MRI结果进行分组:单、双侧海马硬化组及非海马硬化组,计算各组病灶侧和病灶对侧的NAA/(Cr+Cho)、NAA/Cr和NAA/Cho并进行比较,同时分析脑电图中癫痫样放电情况.结果 38例患者中有14例MRI发现海马硬化(比例 为36.8%),31例1H-MRS异常(比例为81.6%),双侧、单侧海马硬化组病灶侧和病灶对侧及非海马硬化组病灶侧的上述3个指标均高于正常对照组(P＜0.05);38例患者中有27例动态脑电图异常,27例动态脑电图异常中有17例与1H-MRS的定位一致,二者的符合率为62.9%.结论 1H-MRS较MRI诊断海马硬化及对癫痫灶定侧的敏感性高;1H-MRS和动态脑电图在癫痫灶的定位中具有一致性.     

颞叶癫痫的核磁共核质子波谱与术后病理对照研究

目的通过对症状明确的颞叶癫痫病人术前的核磁共振质子波谱与术后病理进行对照分析,评价核磁共振质子波谱分析对颞叶癫痫的诊断价值.方法24例症状明确的颞叶癫痫病人,术前均作发作间期脑电图和/或视频脑电监测及MRI、PET检查.根据临床表现、脑电、MRI、PET等检查结果综合评估确定病侧,术前做双侧近中颞叶脑组织的核磁共振质子波谱,术中在脑电监测下切除病灶及致痫灶并送病理检查.结果本组24例病人有19例单侧或双侧颞叶的NAA/(CR+CHO)值低于0.6,其中13例为双侧异常,另外6例为单侧异常;双侧均不低于0.6的有5例,均有一侧至少低于对侧0.07,可确定为异常,其中2例MRS检查结果与术后病理结果不相吻合.结论颞叶癫痫病人的颞叶脑组织核磁共振质子波谱检查异常侧与病理改变有较好的对应性,它可以无创性探测活体脑组织代谢功能的异常,MRS不仅可以发现双侧病变,而且可以指出病理改变较严重的一侧,为术前癫痫灶的定位、定侧提供可靠的依据.     

磁共振质子波谱分析对颞叶癫(癇)定侧的研究

目的探讨在磁共振质子波谱分析(1HMRS)对颞叶癫疒间的定侧作用及其影响因素。方法用1.5T场强的MR成像系统1HMRS,对40例不同病程的颞叶癫疒间患者和20名正常对照者分别进行双颞叶内侧N乙酰天门冬氨酸(NAA)、胆碱(Cho)、肌酸(Cr)浓度测定,根据颞叶癫疒间患者两侧NAA/(Cho Cr)值进行定侧。结果NAA/(Cho Cr)值正常对照组为0.58±0.09,癫疒间组病灶侧为0.45±0.12,病灶对侧为0.51±0.10,癫疒间组两侧显著小于正常对照组(均P<0.05);24例患者1HMRS癫疒间灶定侧与EEG一致,符合率63%;病灶侧内、中、外各亚区NAA/(Cho Cr)值较正常对照组低,差异有显著性(均P<0.05);病灶侧NAA/(Cho Cr)值下降程度与单或双侧NAA/(Cho Cr)值下降及发作频率无关(P>0.05);双侧NAA/(Cho Cr)值异常者两侧EEG异常率高于单侧异常者(P<0.05);病灶侧NAA/(Cho Cr)值与病程呈负相关(r=-0.361,P<0.05)。结论癫疒间患者脑代谢异常弥散;1HMRS在颞叶癫疒间有定侧作用;NAA/(Cho Cr)值与病程呈负相关。     

磁共振波谱分析与癫痫临床

磁共振波谱(MRS)是一新兴无创性检查手段,已应用于癫痫的诊断及疗效评价。与MRI及PET相比,MRS 可更敏感的发现病灶。目前,1H MRS应用最广泛,颞叶癫痫患者病灶内NAA浓度、NAA／(Cho+Cr)比值明显降低, 部分单侧病灶患者会出现双侧NAA改变,是继发还是原发仍有争议;全面发作性癫痫患者额叶或丘脑也出现NAA／ (Cho+Cr)比值降低。癫痫发作后,还可观察到病灶内Glu含量升高、GABA含量降低,有效的抗癫痫治疗后,各指标 恢复到正常水平。31P MRS中Pcr／Pi比值降低、PME减少和pH值升高也见于癫痫发作后。总之,MRS可在生化代谢 水平来反映和评价疾病,已显示出极大地临床应用价值。     

颞叶癫(癎)的影像诊断

结合文献从计算机体层摄影(CT)、磁共振检查(MRI)和磁共振波谱分析(MRS),以及SPECT、PET、FMRI,介绍了近年来诊断颞叶癫(癎)(TLE)的进展.CT扫描对颅内较大病变和梗塞灶的发现具有高度敏感性,尤为钙化灶的发现优于MRI.MRI常能最精细地发现颞叶癫(癎)病人的脑结构灶病变,尤其是能准确地诊断出海马硬化,在T2像或行FLAIR系列像上信号增强,阳性率可达60%～100%.MRS能测定出活体脑内代谢产物的分布,是与癫(癎)灶生物化学改变密切相关的.在TLE病人采用MRS技术,可测出NAA峰值的降低和/或Cr,Cho峰值的升高,临床上常以NAA/Cr,Cho的比值来作为TLE的定侧指标.还简述了SPECT、PET和fMRI对诊断的价值.     

颞叶癫痫的核磁共振质子波谱与术后病理对照研究

目的：通过对症状明确的颞叶癫痫病人术前的核磁共振质子波与术后病理进行对照分析,评价核磁共振质子波谱分析对颞叶癫痫的诊断价值。方法：24例症状明确的颞叶癫痫病人,术前均作发作间期脑电图和／或视频脑电监测及MRI、PET检查。根据临床表现,脑电、MRI、PET等检查结果综合评估确定病侧,术前做双侧近中颞叶脑组织的核磁共振质子波谱,术中在脑电监测下切除病灶及致痫灶并送病理检查。结果：本组24例病人有19例单侧或双侧颞叶的NAA／（CR＋CHO）值低于0．6,其中13例为双侧异常,另外6例为单侧异常;双侧均不低于0．6的有5例,均有一侧至少低于对照0．07,可确定为异常,其中2例MRS检查结果与术后病理结果不相吻合。结论：颞叶癫痫病人的地脑组织核磁共振质子波谱检查异常侧与病理改变有较好的对应性,它可以无创性探测活体脑组织代谢功能的异常,MRS不仅可以发现双侧病变,而且可以指出病理改变较严重的一侧,为术前癫痫灶的定位、定侧提供可靠的依据。     

癫痫患儿头颅氢质子磁共振波谱改变的研究

目的 探讨癫痫患儿头颅氢质子磁共振波谱(1H-MRS)影像学改变特点及临床意义.方法 选取自2008年3月至2011年3月在广东省人民医院就诊的癫痫患儿64例(癫痫组)及对照组10例(门诊体检健康儿童)为观察对象,癫痫组根据头颅MR有无结构异常再分为MR正常组和MR异常组.全部观察对象行头颅海马区1H-MRS检查.选取N-乙酰天门冬氨酸/(胆碱+肌酸)[NAA/(Cho+Cr)]为观察指标,比较3组之间的差别. 结果 3组成员左右侧海马NAA/(Cho+Cr)比较差异均无统计学意义(P＞0.05);组间NAA/(Cho+Cr)比较差异有统计学意义(P＜0.05).其中对照组与MR正常组、对照组与MR异常组间差异有统计学意义(P＜0.05),但MR正常组与MR异常组间差异无统计学意义(P＞0.05). 结论 癫痫患儿的1H-MRS改变较MR敏感,MRS可早于MR发现癫痫异常改变.     

Seizure frequency and bilateral temporal abnormalities: a proton magnetic resonance spectroscopy of temporal lobe epilepsy.

Proton magnetic resonance spectroscopy ((1)H-MRS) was performed in seven healthy volunteers and 17 patients with temporal lobe epilepsy (TLE) to clarify the correlation of the severity of epilepsy with bilateral temporal changes in N-acetylaspartate (NAA), choline-containing compounds (Cho) and creatine + phosphocreatine (Cr). Despite unilateral EEG focus, bilateral temporal reduction in NAA /(Cho + Cr) was revealed in patients with intractable seizures. The potential for seizure generation correlated with the NAA /(Cho + Cr) reduction not only on the ipsilateral side but also on the contralateral side. Proton MRS proved to be a useful measurement for obtaining important information about the neuronal changes as well as the lateralization of the epileptogenic focus in TLE patients.     

Widespread extrahippocampal NAA/(Cr+Cho) abnormalities in TLE with and without mesial temporal sclerosis

MR spectroscopy has demonstrated extrahippocampal NAA/(Cr+Cho) reductions in medial temporal lobe epilepsy with (TLE-MTS) and without (TLE-no) mesial temporal sclerosis. Because of the limited brain coverage of those previous studies, it was, however, not possible to assess differences in the distribution and extent of these abnormalities between TLE-MTS and TLE-no. This study used a 3D whole brain echoplanar spectroscopic imaging (EPSI) sequence to address the following questions: (1) Do TLE-MTS and TLE-no differ regarding severity and distribution of extrahippocampal NAA/(Cr+Cho) reductions? (2) Do extrahippocampal NAA/(Cr+Cho) reductions provide additional information for focus lateralization? Forty-three subjects (12 TLE-MTS, 13 TLE-no, 18 controls) were studied with 3D EPSI. Statistical parametric mapping (SPM2) was used to identify regions of significantly decreased NAA/(Cr+Cho) in TLE groups and in individual patients. TLE-MTS and TLE-no had widespread extrahippocampal NAA/(Cr+Cho) reductions. NAA/(Cr+Cho) reductions had a bilateral fronto-temporal distribution in TLE-MTS and a more diffuse, less well defined distribution in TLE-no. Extrahippocampal NAA/(Cr+Cho) decreases in the single subject analysis showed a large inter-individual variability and did not provide additional focus lateralizing information. Extrahippocampal NAA/(Cr+Cho) reductions in TLE-MTS and TLE-no are neither focal nor homogeneous. This reduces their value for focus lateralization and suggests a heterogeneous etiology of extrahippocampal spectroscopic metabolic abnormalities in TLE.     

Neural damage due to temporal lobe epilepsy: dual-nuclei (proton and phosphorus) magnetic resonance spectroscopy study

The aim of this study was to evaluate the usefulness of proton and phosphorus (1H and 31P) magnetic resonance spectroscopy (MRS) for temporal lobe epilepsy (TLE) patients, and to evaluate neural damage and metabolite dysfunction in the TLE patient brain. We performed 1H and 31P MRS of medial temporal lobes (MTL) in the same TLE patients (n = 14) with a relatively wide range of severity from almost seizure-free to intractable, and calculated the ratio of N-acetylasparate to choline-containing compounds and creatine + phosphocreatine (NAA/Cho + Cr) in 1H MRS and inorganic phosphate to all main peaks (%Pi) in 31P MRS. There was no significant correlation between NAA/(Cho + Cr) and %Pi in each side (ipsilateral, r = -0.20; contralateral, r =-0.19). The values of NAA/(Cho + Cr) showed a significant difference between ipsilateral and contralateral MTLs to the focus of TLE patients (P < 0.01, paired t-test). Although %Pi also had a tendency to show the laterality of TLE, there was no significance. Ipsilateral (r = -0.90, P < 0.0001) and contralateral (r = -0.70, P < 0.005) NAA/(Cho + Cr) decreases and contralateral %Pi increase (r = 0.81, P < 0.001) had significant correlation with seizure frequency. 1H MRS provides more important information concerning neuronal dysfunction in MTL of TLE patients than 31P MRS.     

Prognostic value of proton magnetic resonance spectroscopic imaging for surgical outcome in patients with intractable temporal lobe epilepsy and bilateral hippocampal atrophy

The objective of this study was to assess which features of temporal lobe proton magnetic resonance spectroscopic imaging (1H-MRSI) are associated with satisfactory surgical outcome in patients with intractable temporal lobe epilepsy and bilateral hippocampal atrophy. We studied 21 patients with intractable temporal lobe epilepsy and bilateral hippocampal atrophy defined by magnetic resonance imaging volumetric measurements who underwent surgical treatment. 1H-MRSI was used to determine the relative resonance intensity ratio of the neuronal marker N-acetylaspartate to creatine + phosphocreatine (NAA/Cr) for mid and posterior temporal lobe regions of the left and right hemisphere, as well as an asymmetry index. Values lower than 2 SDs below the normal mean were considered abnormal. We used Engel's classification to assess surgical outcome with respect to seizure control. Eleven patients (52%) were in class I-II and 10 (48%) were in class III-IV. All 21 were operated on the side of maximal electroencephalographic (EEG) lateralization. Concordant lateralization of decreases in NAA/Cr to the side of surgery and normal NAA/Cr values in the contralateral posterior-temporal region were significantly associated with good surgical outcome: 11 (69%) of 16 patients with 1H-MRSI abnormalities concordant with EEG lateralization and none of the 5 patients with nonconcordant 1H-MRSI had a good outcome (class I-II); 10 (77%) of 13 patients with normal NAA/Cr contralateral to the EEG lateralization versus 1 (12.5%) of 8 of those with NAA/Cr reduction contralateral to EEG lateralization were in class I-II. Regression correlation analysis showed significant linear correlation between the midtemporal NAA/Cr relative asymmetry ratio and surgical outcome; the greater the asymmetry, the better the outcome. We conclude that discriminant 1H-MRSI features associated with favorable surgical outcome in patients with temporal lobe epilepsy and bilateral hippocampal atrophy were (1) concordant 1H-MRSI lateralization, (2) a greater side-to-side asymmetry of NAA/Cr, and (3) an absence of contralateral posterior NAA/Cr reduction.     

Proton magnetic resonance spectroscopy in children with temporal lobe epilepsy

We performed proton magnetic resonance spectroscopy of the mesial temporal regions in 20 children with intractable temporal lobe epilepsy and compared results with those from 13 normal subjects. Abnormalities of the ratio of N-acetylaspartate to choline plus creatine (NAAI[Cho+Cr]) were seen in 15 patients (75%). The ratio NAA/(Cho+Cr) was correctly lateralizing in 55% and incorrectly lateralizing in none. Bilateral abnormalities were seen in 45%. Overall there was a unilateral decrease in N-acetylaspartate on the side ipsilateral to the seizure focus (mean 19% decrease vs normals, with 5% decrease on the contralateral side), suggesting neuronal loss or dysfunction. There was also a bilateral increase in creatine and choline (mean l8%), consistent with reactive astrocytosis. We conclude that proton magnetic resonance spectroscopy can contribute to lateralization of the seizure focus, and by detection of bilateral abnormalities, can contribute to the understanding of the underlying pathophysiology in temporal lobe epilepsy.     

Contralateral medial temporal lobe damage in right but not left temporal lobe epilepsy: a (1)H magnetic resonance spectroscopy study

BACKGROUND: Proton magnetic resonance spectroscopy (MRS) of the hippocampus is useful in lateralising the epileptic focus in temporal lobe epilepsy for subsequent surgical resection. Previous studies have reported abnormal contralateral MRS values in up to 50% of the patients. OBJECTIVE: To identify the contributing factors to contralateral damage, as determined by MRS, and its extension in patients with temporal lobe epilepsy. METHODS: Single voxel MRS was carried out in the hippocampus and lateral temporal neocortex of both hemispheres in 13 patients with left temporal lobe epilepsy (LTLE) and 16 patients with right temporal lobe epilepsy (RTLE). All patients had mesial temporal lobe epilepsy with hippocampal sclerosis. Controls were 21 healthy volunteers of comparable age. RESULTS: Consistent with previous studies, the NAA/(Cho+Cr) ratio was abnormally low in the hippocampus ipsilateral to the focus (p < 0.0001), and there were lower values in both patient groups in the ipsilateral temporal neocortex (p < 0.0001). Patients with RTLE had left hippocampal MRS anomalies (p = 0.0018), whereas the right hippocampus seemed to be undamaged in LTLE patients. CONCLUSIONS: Unilateral mesial temporal lobe epilepsy is associated with widespread metabolic abnormalities which involve contralateral mesial and neocortical temporal lobe structures. These abnormalities appear to be more pronounced in patients with RTLE.     

Identification of abnormal neuronal metabolism outside the seizure focus in temporal lobe epilepsy

PURPOSE: The aim of this study was to identify metabolically abnormal extrahippocampal brain regions in patients with temporal lobe epilepsy with (TLE-MTS) and without (TLE-no) magnetic resonance imaging (MRI) evidence for mesial-temporal sclerosis (MTS) and to assess their value for focus lateralization by using multislice 1H magnetic resonance spectroscopic imaging (MRSI). METHODS: MRSI in combination with tissue segmentation was performed on 14 TLE-MTS and seven TLE-no and 12 age-matched controls. In controls, N-acetylaspartate/(creatine + choline) [NAA/(Cr+Cho)] of all voxels of a given lobe was expressed as a function of white matter content to determine the 95% prediction interval for any additional voxel of a given tissue composition. Voxels with NAA/(Cr+Cho) below the lower limit of the 95% prediction interval were defined as "pathological" in patients and controls. Z-scores were used to identify regions with a higher percentage of pathological voxels than those in controls. Results: Reduced NAA/(Cr+Cho) was found in ipsilateral temporal and parietal lobes and bilaterally in insula and frontal lobes. Temporal abnormalities identified the epileptogenic focus in 70% in TLE-MTS and 83% of TLE-no. Extratemporal abnormalities identified the epileptogenic focus in 78% of TLE-MTS but in only 17% of TLE-no. Conclusions: TLE is associated with extrahippocampal reductions of NAA/(Cr+Cho) in several lobes consistent with those brain areas involved in seizure spread. Temporal and extratemporal NAA/(Cr+Cho) reductions might be helpful for focus lateralization.     

Reduction in temporal N-acetylaspartate and creatine (or choline) ratio in temporal lobe epilepsy: does this 1H-magnetic resonance spectroscopy finding mean poor seizure control?

BACKGROUND—Proton magnetic resonance spectroscopy(¹H-MRS) is a potentially useful tool in the in vivoinvestigation of brain metabolites in intractable temporal lobeepilepsy (TLE). Focal N-acetylaspartatate (NAA) reductions have beencorrelated with mesial temporal sclerosis (MTS) in surgically resectedepileptogenic foci.
OBJECTIVE—To evaluate the abnormalities in themetabolites NAA, creatine+ phosphocreatine (Cr), and cholinecontaining compounds (Cho) in the temporal lobe of medically refractorypatients with temporal lobe epilepsy, seizure free patients withtemporal lobe epilepsy, and normal controls.
PATIENTS AND METHODS—Ten refractory patients, 12 seizure free patients with temporal lobe epilepsy, and 10 age matchednormal controls were studied by ¹H-magnetic resonancespectroscopy. All patients had consistently unilateral temporal EEGabnormalities and a normal brain MRI. Proton MR spectra were obtainedfrom an 8 ml volume in the medial temporal lobes in patients withtemporal lobe epilepsy (ipsilateral to EEG foci) and the normalcontrols. The signals measured were expressed in terms of NAA/Cr,NAA/Cho, and Cho/Cr.
RESULTS—When compared with seizure free patientswith temporal lobe epilepsy and normal controls, the 10 refractorypatients with temporal lobe epilepsy had a lower mean (SEM) NAA/Crratio (1.65(0.53) v 2.62 (0.60), and 2.66 (0.73);p<0.002 and p<0.006) and a lower mean NAA/Cho ratio (1.59 (0.79)v 2.83 (1.33) and 2.58(0.67); p<0.02 andp<0.007).Furthermore, the two patients showing the lowest NAA/Cr ratios (1.47 and 1.73) in the seizure free group had had a past period of poorseizure control.
CONCLUSIONS—There were reduced temporal NAA/Cr andNAA/Cho ratios, suggesting neuronal loss or damage, associated withpast or present poor seizure control in the patients with temporal lobeepilepsy, but it does not exclude the possibility of a future completeseizure control (seizure free patients with temporal lobe epilepsy at the time of ¹H-MRS). This study warrants further¹H-MRS investigation with a larger series of patients withtemporal lobe epilepsy.

     

颞叶癫Xian术前综合定位诊断

目的:研究术前对颞叶癫癎不同定位手段的综合应用。方法:采用ＥＥＧ、ＰＥＴ、ＭＲＩ、ＭＲＳ对２４例顽固性颞叶癫癎患者进行术前定位。结果:结合ＥＥＧ,ＭＲＩ,ＭＲＳ,ＰＥＴ对８３%,７９%,８５%病例作出定位;ＥＥＧ结合ＭＲＩ与ＭＲＳ,可对９２%病例作出定位;ＥＥＧ结合ＭＲＩ,ＭＲＳ,ＰＥＴ,可对９６%的病例作出定位。结论:结合ＥＥＧ,综合采用ＭＲＩ,ＭＲＳ,ＰＥＴ等手段可提高对颞叶癫癎术前定位的准确率。     

颞叶癫(癎)与磁共振质子波谱及利物浦(癎)性发作严重程度量表的研究

目的 评价磁共振质子波谱扫描与利物浦癎性发作严重程度量表对颞叶癫癎的诊断价值。方法 采用磁共振成像和质子波谱对15例颞叶癫癎患者及15例健康志愿者进行检测，并用量表对患者做进一步评估。结果 癫癎组病侧NAA/（Cr＋Cho）比值明显低于对侧以及正常组（P〈0.01），后二者比较差异无显著性（P〉0.05）；病侧NAA/（Cr＋Cho）比值与LSSS2.0评分分数呈显著正相关（r=0.969，P〈0.05）。结论 磁共振质子波谱较磁共振成像更能早期、准确地反映癫癎的脑损伤，LSSS2.0评分与NAA/（Cr＋Cho）比值能一致反映脑损伤的严重程度。