肌萎缩侧索硬化症病人大脑中央前回运动区磁共振波谱分析

目的 :1H MRS是否可确定ALS病人大脑皮质运动区神经元受损 ,是否适用于监测ALS病情。方法 :病例组包括 9例ALS病人。对照组包括 5例健康人 ,同时测定大脑皮质运动区的NAA、Cho、Cr。结果 :ALS病例组中NAA/Cr显著低于对照组 (P <0 0 5 ) ,Cho/Cr显著高于对照组 (P <0 0 1)。结论 :NAA/Cr下降和Cho/Cr升高 ,提示ALS病人大脑皮质运动区存在神经元破坏和鞘膜功能的异常     

Effect of Creatine Supplementation on Metabolite Levels in ALS Motor Cortices

Mitochondrial pathology is an early observation in motor neurons and skeletal muscle of patients with amyotrophic lateral sclerosis (ALS). To clarify the relevance of this finding, we determined the effects of a 1-month oral administration of creatine on (1)H NMR-visible metabolites in the motor cortices of 15 controls and 15 patients with sporadic ALS, most of whom had mitochondrial pathology in skeletal muscle. In the motor cortex of the ALS group the N-acetylaspartate (NAA)/creatine (Cr(t)) metabolite ratio was lower than in our control group, indicating NAA loss. Upon creatine supplementation we observed in the controls a decline in the NAA/Cr(t), NAA/choline (Cho), glutamate + glutamine (Glx)/Cr(t), and Glx/Cho metabolite ratios. In contrast, in the ALS patient group the NAA/Cr(t) and the NAA/Cho metabolite ratios remained unchanged, while the Glx/Cr(t) and Glx/Cho metabolite ratios decreased. These data are compatible with the interpretation that creatine supplementation causes an increase in the diminished NAA levels in ALS motor cortex as well as an increase of choline levels in both ALS and control motor cortices. Because NAA is synthesized by mitochondria in an energy-dependent manner and the NAA/Cho metabolite ratios in the ALS motor cortices were found to be correlated to the degree of mitochondrial pathology in ALS skeletal muscle, our results can be explained by a deficiency of enzymes of mitochondrial respiratory chain in the ALS motor cortex which might affect motor neuron survival.     

Brain metabolites in definite amyotrophic lateral sclerosis

Abstract Biomarkers beyond clinical assessment are needed in patients who suffer from amyotrophic lateral sclerosis (ALS). Here, single-voxel proton magnetic resonance spectroscopy (¹H MRS) of the gray matter of the motor cortex and the white matter including the pyramidal tracts was used to investigate concentrations of N-acetylaspartate (NAA), creatine (Cr), choline (Cho), myoinositol, glutamate, and glutamine in patients with definite ALS in a longitudinal design (three measurements at study inclusion, after 3 and 6 months). A volume-corrected analysis of gray and white matter fractions within the volumes of interest (VOI) was performed for the identification of the absolute metabolite concentrations. The patient group showed a significant decline of the compound NAA over time in the motor cortex areas both of the clinically more and less affected hemisphere between first measurement and month 6 and for the less affected side additionally between first measurement and month 3. For the NAA/(Cr + Cho) ratio, significant decline in the less affected hemisphere was observed from the first measurement to month 3 and to month 6 as well as from month 3 to month 6. In contrast, neither NAA nor the NAA/(Cr + Cho) ratios in the white matter areas showed any significant alterations. All other compounds showed no significant changes over time. In summary, the longitudinal changes of cortical metabolite concentrations in the course of ALS could be assessed by optimized ¹H MRS techniques at group level, so that ¹H MRS parameters, in particular volume-corrected values of NAA in the clinically less affected hemisphere, seem to have the potential to serve as a surrogate marker for monitoring ALS disease progression.     

磁共振波谱检测肌萎缩侧索硬化的上运动神经元损害

目的探讨质子磁共振波谱(proton magnetic resonance spectroscopy,1 H-MRS)检测肌萎缩侧索硬化(amyotrophic lateral sclerosis,ALS)的上运动神经元损害(upper motor neuron,UMN)的特点和诊断准确性。方法收集ALS患者31例和健康对照32名,采用1 H-MRS检测脑中央前回皮质下、内囊后肢和大脑脚感兴趣区代谢产物N-乙酰天冬氨酸(NAA)、胆碱(Cho)、肌酸(Cr)的水平,计算NAA/Cr、NAA/(Cho+Cr)、Cho/Cr比值,采用受试者工作特征(receiver operating characteristic,ROC)曲线分析1 H-MRS对ALS患者UMN损害的诊断价值。结果 ALS患者各锥体束走行部位和部位组合的NAA/Cr和NAA/(Cho+Cr)较对照组显著降低(P0.05)。NAA比值预测ALS的UMN损害的ROC曲线下面积(area under the curve,AUC)为0.67~0.91,其中内囊后肢、大脑脚两部位的平均NAA/(Cho+Cr)和三部位的平均NAA/(Cho+Cr)的AUC、灵敏度、特异度分别为0.91、0.828、0.906和0.90、0.769、0.875。结论 1 H-MRS可检出ALS患者锥体束走行的生化代谢异常,是评估ALS的UMN损害的客观影像学指标,其诊断准确性中等,多水平检测和综合指标的选择有助于提高其诊断效力。     

精神分裂症患者前额叶和丘脑的质子磁共振波谱研究

Objective To identify the metabolite levels in prefrontal lobe and thalamus in patients with schizophrenia by proton magnetic resonance spectroscopy (1H-MRS). Methods Thirty-eighty schizophrenics and 38 normal controls were involved in this study. A multi-voxel 1H-MRS was given to all the subjects on prefrontal lobe and thalamus within 24 hours they got in hospital. The N-acetylaspartate (NAA), choline-congtaining compounds (Cho), and creatine compounds (Cr) were measured and the ratios of NAA/Cr, Cho/Cr and NAA/( Cho + Cr) were determined Results In left prefrontal lobe and bilateral thalamus, the NAA/Cr ratio in patients demonstrated lower than that in normal controls ( all P <0. 05). In left prefrontal lobe, the NAA/(Cho + Cr) ratio in patients showed lower than that in normal controls (0. 64 ±0. 13 vs. 0. 74±0. 22,t =2. 26, P<0. 05). Both in patients and in normal controls, there were no significant differences in NAA/Cr, Cho/Cr and NAA/(Cho + Cr) between the two sides (all P >0. 05). Conclusious Abnormalities in neuronal function and/or integrity are present in schizophrenics.There is no significantly lateralized asymmetry for metabolite levels such as NAA, Cho and Cr in either the schizophrenics or the controls.     

Measures of hippocampal volumes, diffusion and 1H MRS metabolic abnormalities in temporal lobe epilepsy provide partially complementary information

We assessed whether interictal measures of hippocampal volume, hippocampal diffusion and metabolic abnormalities yield correlated or complementary information about hippocampal pathology in patients with temporal lobe epilepsy (TLE). Volumes, apparent diffusion coefficients (ADC) and ratios of N-acetyl-aspartate (NAA) to Creatine/Phosphocreatine (Cr) and Choline (Cho) were measured from each hippocampus during one magnetic resonance imaging (MRI) session in patients with TLE. Structural MRI showed unilateral hippocampal sclerosis (HS) in 13 patients and was normal in the remaining nine patients. Pearson's correlation (two-tailed) between ADC values and NAA/(Cr + Cho) ratios was significant (P = 0.04, r = -0.45) for the hippocampus ipsilateral to the epileptogenic zone as determined on the basis of interictal and ictal scalp EEG recordings. This finding was driven by a very high correlation between the two measures in the presence of HS (P < 0.001, r = -0.96). Furthermore, ipsilateral ADC values but not NAA/(Cr + Cho) ratios were correlated with disease duration (P = 0.001, r = 0.67). Hippocampal volumes did not correlate with either ADC values, NAA/(Cr + Cho) ratios or disease duration. These data suggest that hippocampal volumes, NAA/(Cr + Cho) ratios and ADC values capture partially complementary aspects of hippocampal pathology.     

Application of proton magnetic resonance spectroscopy on substantia nigra metabolites in Parkinson’s disease

This study investigates changes in substantia nigra metabolites in Parkinson’s disease (PD) using proton magnetic resonance spectroscopy (¹H- MRS). Thirty patients with asymmetric PD and 20 normal controls were included in this study. Substantia nigra metabolites were detected in all subjects using 3D-multimer ¹H-MRS with a 3.0 T MRI scanner. The relative ratios of NAA/Cr, NAA/Cho, NAA/(Cho + Cr) in the substantia nigra were compared between two sides of asymmetric PD patients as well as between PD patients and controls. Significant differences in NAA/Cr, NAA/Cho, NAA/(Cho + Cr) were observed between PD patients and healthy controls (P?<?0.05) as well as between the ipsilateral and contralateral of affected extremity in PD patients (P?<?0.05). Significant differences in NAA/Cr, NAA/Cho, NAA/(Cho + Cr) were also observed between patients with mild and severe PD. Thus, we found that ¹H-MRS can be used to detect substantia nigra metabolites in PD patients, which may be useful for early diagnosis and evaluation of PD.     

The ratio of N-acetyl aspartate to glutamate correlates with disease duration of amyotrophic lateral sclerosis

Glutamate (Glu)-induced excitotoxicity has been implicated in the neuronal loss of amyotrophic lateral sclerosis. To test the hypothesis that Glu in the primary motor cortex contributes to disease severity and/or duration, the Glu level was investigated using MR spectroscopy. Seventeen patients with amyotrophic lateral sclerosis were diagnosed according to the El Escorial criteria for suspected, possible, probable or definite amyotrophic lateral sclerosis, and enrolled in this cross-sectional study. We measured metabolite concentrations, including N-acetyl aspartate (NAA), creatine, choline, inositol, Glu and glutamine, and performed partial correlation between each metabolite concentration or NAA/Glu ratio and disease severity or duration using age as a covariate. Considering our hypothesis that Glu is associated with neuronal cell death in amyotrophic lateral sclerosis, we investigated the ratio of NAA to Glu, and found a significant correlation between NAA/Glu and disease duration (r = −0.574, p = 0.02). The “suspected” amyotrophic lateral sclerosis patients showed the same tendency as possible, probable and definite amyotrophic lateral sclerosis patients in regard to correlation of NAA/Glu ratio with disease duration. The other metabolites showed no significant correlation. Our findings suggested that glutamatergic neurons are less vulnerable compared to other neurons and this may be because inhibitory receptors are mainly located presynaptically, which supports the notion of Glu-induced excitotoxicity.     

Detection of cerebral degeneration in amyotrophic lateral sclerosis using high-field magnetic resonance spectroscopy

BACKGROUND: Clinical assessment is insensitive to the degree of cerebral involvement in amyotrophic lateral sclerosis (ALS). Regional brain concentrations N-acetylaspartylglutamate (NAA) plus myo-inositol (Ins), as measured by magnetic resonance spectroscopy, are respectively decreased and increased, suggesting that these compounds may provide a biomarker of the degree of cerebral involvement in ALS. OBJECTIVE: To test the hypothesis that the NAA/Ins ratio may provide an index of cerebral involvement in patients with ALS. DESIGN: High-field (3.0-T) magnetic resonance spectroscopy was performed to determine the NAA/creatine plus phosphocreatine (NAA/Cr), NAA/choline (NAA/Cho), Ins/Cr, and NAA/Ins ratios in the motor cortex. PARTICIPANTS: Seventeen patients with ALS and 15 healthy control subjects were studied. RESULTS: In patients with ALS, the greatest abnormality was a 22% decrease in NAA/Ins (71% sensitivity and 93% specificity, P = .001); Ins/Cr was increased 18% (88% sensitivity and 53% specificity, P = .04), NAA/Cr was decreased 10% (88% sensitivity and 47% specificity, P = .04), and NAA/Cho was decreased 14% (53% sensitivity and 87% specificity, P = .047). Correlation of the ALS Functional Rating Scale with NAA/Ins approached statistical significance (R = 0.43, P = .07). CONCLUSION: The NAA/Ins ratio may provide a meaningful biomarker in ALS given its optimal sensitivity and specificity profile.     

帕金森病患者不同脑区质子磁共振波谱研究

目的:探讨~1H-MRS对早期PD的诊断价值。方法:采用~1H-MRS技术检测早期PD、晚期PD、帕金森综合征、偏侧ET以及年龄匹配的正常对照组基底节区和皮质运动区感兴趣区的NAA/Cr和Cho/Cr比值。结果:早期或晚期PD、偏侧ET及帕金森综合征患者受累较重基底节区或运动皮质区NAA/Cr及Cho/Cr比值与受累较轻侧相比无显著性差异;上述各组患者受累较重基底节区或运动皮质区NAA/Cr及Cho/Cr比值与正常对照组相应感兴趣区NAA/Cr及Cho/Cr比值相比也均无显著性差异。结论:~1H-MRS无助于早期PD的诊断。     

质子磁共振波谱用于帕金森病黑质代谢研究价值的探讨

目的探讨质子磁共振波谱（^1H MRS）技术在帕金森病（PD）黑质代谢变化研究中的价值。方法PD患者56例和正常对照30例行^1H MRS检查，测定双侧黑质的N-乙酰天门冬氨酸／肌酸（NAA／Cr）、N-乙酰天门冬氨酸／胆碱复合物（NAA／Cho）和胆碱复合物／肌酸（Cho／Cr）比值。结果PD患者和对照组黑质的NAA／Cr、Cho／Cr和NAA／Cho比值无显著性差异。PD患者的^1H MRS结果与UPDRS评分、H＆Y分级和病程均不存在显著相关性。结论目前的^1H MRS技术尚不能精准地反应PD患者黑质的代谢变化。     

N-Acetylaspartate and creatine levels measured by (1)H MRS relate to recognition memory

OBJECTIVES: To investigate the relationship between recognition memory and metabolite levels in medial structures of the temporal lobes in the living human brain. METHODS: Proton MRS ((1)H MRS) and the intracarotid amobarbital test were performed in 16 epileptic patients found suitable for temporal lobectomy. All patients had mesial temporal sclerosis. Metabolite ratios between N:-acetylaspartate (NAA), creatine and phosphocreatine (Cr + PCr), and choline-containing compounds (Cho) [NAA/(Cr + PCr), NAA/Cho, and NAA/(Cr + PCr + Cho)] were calculated for (1)H MRS voxels that included the amygdala, anterior half of the hippocampus, and underlying subiculum. Metabolite ratios were correlated with unilateral memory scores estimated by the intracarotid amobarbital test for words, objects, faces, and total score. RESULTS: The total memory score, memory for objects and faces, and NAA/(Cr + PCr) were significantly lower for the hemisphere ipsilateral to the resection. The asymmetry indexes for NAA/(Cr + PCr) correlated with asymmetry indexes for words (rho = 0.82, p = 0.0001) and total memory (rho = 0. 72, p = 0.002). Analysis of memory scores and metabolite ratios from all 32 hemispheres revealed a correlation between NAA/(Cr + PCr) and memory for words (rho = 0.45, p = 0.009). A correlation between memory for words and NAA/(Cr + PCr) existed in the contralateral (rho = 0.58, p = 0.019) and in the right (rho = 0.51, p = 0.045) hemispheres, and a trend was found in the left hemispheres (rho = 0. 48, p = 0.06). CONCLUSION: There is a correlation between memory for words and the NAA/(Cr + PCr) ratio from medial temporal structures in patients with mesial temporal sclerosis. The findings suggest that medial temporal structures and adjacent neocortex play a significant role in recognition memory in humans, particularly for words.     

正常人半卵圆中心质子磁共振波谱研究

目的运用质子磁共振波谱（^1H-MRS）研究年龄对正常人半卵圆中心脑组织代谢物浓度的影响。方法对80例健康成人双侧半卵圆中心进行^1H-MRS检测,对比分析不同年龄组的半卵圆中心N-乙酰基天门冬氨酸（NAA）/肌酸复合物（Cr）和含胆碱化合物（Cho）/Cr比值的变化。结果随着年龄的增长,在≤50岁年龄段半卵圆中心的NAA/Cr和Cho/Cr比值无明显改变,但在〉50岁年龄段半卵圆中心的NAA/Cr比值逐渐降低、Cho/Cr比值逐渐增高。结论^1H-MRS是可以为正常人半卵圆中心与年龄相关的代谢物浓度的改变提供有价值的信息的一种无创技术。     

Proton magnetic resonance spectroscopy in Kennedy syndrome

OBJECTIVE: To seek regional metabolite abnormalities in patients with Kennedy disease (KD) using proton magnetic resonance spectroscopy. DESIGN: Nine patients with KD showing the typical phenotype without clinical signs of upper motor neuron involvement were compared with 17 male, age-matched, healthy control subjects. Relative metabolite concentrations for N-acetyl (NA) groups, choline-containing groups (Cho), phosphocreatine (Cr), and lactate (Lac) were determined in the brainstem and the motor region. RESULTS: Pathologic Lac signals suggesting impaired energy metabolism were absent in patients and controls. In the brainstem area, patients with KD showed a significant reduction in the NA/Cho metabolite ratio (P = .01). In the motor region, NA/Cho (P = .04) and NA/Cr (P = .03) ratios were significantly reduced. The reduction of the NA/Cho ratio in the motor region mainly resulted from decreased metabolite ratios in 3 patients. Changes in metabolite ratios did not correlate with the number of trinucleotide cytosine-adenine-guanine repeats from leukocytes. Because of the relatively small sample size due to the rarity of KD, these results should be considered preliminary. CONCLUSIONS: Spectroscopic data fail to provide further evidence for altered energy metabolism in KD. Metabolite changes in the brainstem indicate a reduction of the neuronal marker NA or elevated Cho. These findings may reflect neuronal loss or gliosis consistent with the known pathologic features. In a subset of patients, altered metabolite ratios best explained by neuronal loss suggest subclinical involvement of the motor region. The extent of metabolite changes does not correlate with the trinucleotide repeat length.     

正常人丘脑质子磁共振波谱分析

背景：磁共振波谱使神经影像学从单纯形态学观察进入到分子水平上的探索,有研究利用磁共振波谱发现疾病发生时丘脑生化代谢物质与正常人存在差异。 目的：利用氢质子磁共振波谱(1H-MRS)观察正常人的丘脑代谢特点,为正常人及脑部疾患的相关治疗提供客观依据。 设计、时间及地点：自身对照,横断面调查,于2007-08/2008-08在解放军第九一中心医院影像中心完成。 对象：选择解放军第九一中心医院附近社区的精神正常的居民及学生共56名,男32名,女24名。所有受检者或其监护人均对调查方案知情同意,并签署知情同意书, 方法：采用1.5T超导型磁共振成像系统,入组24 h后采用多体素1H-MRS检测丘脑生化代谢物N-乙酰天冬氨酸、胆碱复合物与肌酸复合物。 主要观察指标：用随机软件测量N-乙酰天冬氨酸、胆碱复合物、肌酸复合物的峰下面积,以肌酸复合物峰为参照,计算机自动完成N-乙酰天冬氨酸/肌酸复合物值、胆碱复合物/肌酸复合物值、N-乙酰天冬氨酸/(胆碱复合物+肌酸复合物)值的计算。 结果：正常人丘脑1H-MRS左侧N-乙酰天冬氨酸/肌酸复合物、N-乙酰天冬氨酸/(胆碱复合物+肌酸复合物)高于右侧,胆碱复合物/肌酸复合物低于右侧,但差异但差异无显著性意义(P > 0.05)。经Pearson分析,丘脑双侧各观察指标与年龄均无相关性(P > 0.05);不同性别间比较,男性组左右两侧N-乙酰天冬氨酸/肌酸复合物、右侧胆碱复合物/肌酸复合物、左侧N-乙酰天冬氨酸/(胆碱复合物+肌酸复合物)均高于女性组,余观察指标低于女性组,但差异均无显著性意义(P > 0.05)。 结论：正常人丘脑代谢物双侧无差异,代谢物水平可能并不受性别和年龄的影响。     

Combined measurements of hippocampal N-acetyl-aspartate and T2 relaxation time in the evaluation of mesial temporal lobe epilepsy: correlation with clinical severity and memory performances.

PURPOSE: In this study we tried to find a correlation between the clinical severity and memory performances, by comparing proton magnetic resonance (MR) spectroscopy and T2 relaxation time measurements in the hippocampi, in a homogeneous group of 27 patients with unilateral mesial temporal lobe epilepsy with ipsilateral hippocampal sclerosis on MR imaging, with a view to answer the following questions: (a) how sensitive is this approach for the assessment of the apparently normal contralateral hippocampus, (b) do the results relate to the clinical severity, and (c) does it allow evaluation of the degree of hippocampal dysfunction. METHODS: Volume-selective proton MR spectroscopy of the head of both hippocampi was performed at 3 T, by using the PRESS sequence, with an echo time of 135 ms, to estimate NAA/(Cho + Cr) ratios. The relaxation times were measured at 0.28 T, by using a conventional Carr-Purcell-Meiboom-Gill sequence, with a repetition time of 2,000 ms, an echo time of 15 ms, and 48 echoes. RESULTS: The combination of NAA/(Cho + Cr) ratio and T2 relaxation time values was allowed to classify contralateral hippocampus abnormalities in two groups: first, decreased NAA/(Cho + Cr) ratio with strongly increased T2 relaxation time values corresponding to abnormalities observed in sclerotic ipsilateral hippocampi; and second, decreased NAA/(Cho + Cr) ratio with normal or slightly increased T2 relaxation time values. Whereas the NAA/(Cho + Cr) ratio or T2 relaxation time value alone was not correlated with memory performances, their association shows that left hippocampal injury evaluated both by NAA and T2 relaxation time measurements was clearly correlated with verbal memory scores, and right hippocampal injury, with visual memory scores. On the other hand, the maximal seizure frequency reported by the patients was correlated with ipsilateral NAA/(Cho + Cr) ratio and T2 relaxation time values but not with contralateral results. CONCLUSIONS: We showed that the combination of NAA and T2 relaxation time measurements can be used to examine the degree of ipsi- and contralateral hippocampal dysfunction or injuries and their relations with memory performances in the presurgical evaluation of patients.     

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。     

Metabolite profile in the basal ganglia of children with cerebral palsy: a proton magnetic resonance spectroscopy study

This prospective study determined metabolite profile in the left and right basal ganglia of children with spastic cerebral palsy (CP) compared with children without disabilities, by using proton magnetic resonance spectroscopy (1HMRS). Twenty-three patients with spastic CP (12 males, 11 females; mean age 11y 9mo [SD 4y 2mo], range 4-17y) were examined. Twenty children had spastic diplegia and three had quadriplegia. Twenty-four normally developing children (13 females, 11 males; mean age 10y 3mo [SD 4y 8mo], range 4-17y) served as a comparison group. The relative concentrations of N-acetylaspartate (NAA), choline (Cho), myo-inositol (mI), and gamma-aminobutyric acid (GABA) were measured relative to creatine (Cr) and different combinations of metabolites within 8cm3 brain voxels. Children with CP showed reduced ratios of NAA:Cr, NAA:Cho, NAA:mI, and GABA:Cr in the basal ganglia relative to a matched comparison group. Patients demonstrated a significant age-dependent increase in NAA:Cr and NAA:Cho in the basal ganglia. No sex-dependent difference was shown in children with CP nor in the comparison group for all tested metabolite ratios. Significant correlation between Apgar score and ratio of mI:Cr in the group with CP was found. None of the tested metabolite ratios were correlated with the severity scale of CP in children with CP. NAA:Cr ratios were negatively correlated with learning disability in patients with CP. Results indicate the association of the metabolite ratios in basal ganglia with learning disability.     

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.     

脑质子磁共振波谱分析对早期帕金森病诊断价值的初步研究

目的探讨质子磁共振波谱（1H—MRS）在早期帕金森病（Parkinson’sdisease,PD）诊断中的临床应用价值。方法对20例偏侧PD患者（Hoehn-YahrI级）和20例年龄匹配正常对照者双侧纹状体进行1H-MRS检测,对比分析PD患者与正常对照者的纹状体N-乙酰基天门冬氨酸（NAA）／肌酸复合物（Cr）和含胆碱化合物（Cho）／Cr比值的变化。结果PD患者患侧肢体对侧纹状体NAA／Cr比值显著低于同侧和正常对照者（P〈0．05）,Cho／Cr比值显著高于同侧和正常对照者（P〈0．05）;但PD患者患侧肢体同侧纹状体NAA／Cr和Cho／Cr比值与正常对照者比较无显著差异（P〉0．05）。结论1H-MRS是可以为偏侧PD患者纹状体的神经细胞病理学改变提供有价值的信息的一种无创技术,有助于早期PD的诊断。