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<title>Chinese Journal of Magnetic Resonance Imaging RSS feed</title>
<link>http://med-sci.cn/cgzcx/en/contents_list.asp?issue=201611</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[Build a Global Positioning System for China-made MRI equipments]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.001</link>
<description><![CDATA[GPS is the abbreviation of Global Positioning System. However, its another concept was generally accepted in the industry of medical equipment: G for the General Electric, P for the Philips and S for the Siemens. For a long time, these three big companies have monopolized the right to speak and cornered the market of high-end medical equipments, especially the MRI equipments. The National Key Research and Development Plan of 2016 published recently was expected to make changes. The “Multicenter Study on Clinical Application and Evaluation of MRI Equipments” directed by Professor Wang Jian from the Third Military Medical University, was on the list of “Research and Development of Digital Medical Equipment” and funded with 11.5 million RMB. The power of many manufacturers, education institutes, research institutes, hospitals and medical device test institutes will be integrated in the project to build a Global Positioning System for the researching, developing, marketing and application of China-made MRI equipments, and provide a guideline for the technical innovation, market expansion and products purchase.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[The repeatability of diffusion kurtosis imaging on the brain tissue in healthy adults]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.002</link>
<description><![CDATA[Objective: To study the reproducibility of diffusion kurtosis imaging (DKI) on the brain tissue in healthy adults. Materials and Methods: Twenty-six healthy volunteers aged from 31 to 66 years were enrolled into this present study. All enrolled subjects were scanned with the DKI sequence on their head and b-factors of 0, 500, 1000, 1500, and 2000 s/mm2 were applied. Two observers (experienced radiologist) independently interpreted the acquired DKI images and conducted the measurement of diffusion coefficient (MD) and diffusion kurtosis coefficient (MK). All statistical analysis were conducted on the SPSS 19.0 software, and the inter-and intra-observer consistency of diffusion coefficient (MD) and diffusion kurtosis coefficient (MK) were tested by the repeatability measurements. Results: The MD and MK of the genu and splenium of the corpus callosum, the anterior and posterior limbs of internal capsule and thalamus were measured by two observers at the different time-points respectively. As a result, the difference between the measurements conducted by the same observer at the different times (intra-observer) was not statistically significant (P＞0.05), whereas the difference between the measurements between different observers (inter-observer) was also not statistically significant (P＞0.05). Conclusions: The parameter measurements of DKI on the brain tissues of normal adults are repeatable and may be potentially used to reflect the changes of the micro-structures of brain tissue.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Middle cerebral artery plaque in patients with recurrent acute ischemic stroke: studied with high-resolution magnetic resonance imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.003</link>
<description><![CDATA[Objective: To study the morphological characteristics of middle cerebral artery plaque in patients with recurrent acute ischemic stroke by 3.0 T high resolution magnetic resonance imaging (HR-MRI). Materials and Methods: Retrospective analysis of clinical data of 77 cases of patients with acute ischemic stroke, the culprit plaques in middle cerebral artery, including 36 cases of patients with primary (primary group), 41 cases with recurrence (recurrence group), all patients underwent 3.0 T high resolution magnetic resonance imaging (plaque scanning sequence including TOF-MRA, DWI for the whole brain, T1WI,T2WI and contrast-enhanced T1WI). Comparative analysis of the primary and recurrent patients plaque morphological characteristics included lumen stenosis rate, minimal lumen area, plaque burden, plaque enhancement rate, T1WI and T2WI plaque signal strength index. Results: The lumen stenosis rate (P=0.002), plaque burden (P=0.005) and plaque enhancement ratio (P=0.037) were significantly higher in the recurrent group than in the primary group, and the minimal lumen area (P=0.001) was significantly smaller than that in the primary group. The T2WI signal intensity index of the recurrence group was higher than that of the primary group (P＜0.001), while the T1WI signal strength index was not significantly different (P=0.245). Conclusions: High resolution magnetic resonance imaging can effectively evaluate the morphological characteristics of middle cerebral artery plaque in patients with recurrent acute ischemic stroke. Comprehensive evaluation of plaque characteristics can provide reference for the clinical and help to prevent recurrence stroke.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Imaging and ADC value in differential diagnosis of intracranial hemangiopericytoma and anaplastic meningioma: a comparative study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.004</link>
<description><![CDATA[Objective: To analyze MRI features of intracranial hemangiopericytoma (HPC) and Anaplastic Meningioma (AM). Exploring the value of DWI and ADC value in differential diagnosis of them. Materials and Methods: The imaging data of 20 cases of HPC and 31 cases of AM pathologically confirmed were collected. They all had plain and enhanced MRI scans and diffusion weighted MRI scans. The results were analyzed in all cases. Results: Differences in tumor shape (χ2=4.763, P＜0.05), hemorrhage (χ2=8.400, P＜0.01), signal void of vessel (χ2=26.793, P＜0.001), brain tumor interface (χ2=4.432, P＜0.05), dural attachment (χ2=15.093, P＜0.001), dural tail (χ2=9.670, P＜0.01), enhancement (χ2=8.025, P＜0.01) and homogenous enhancement (χ2=5.097, P＜0.05) between HPC and AM were statistically significant. Differences in T2WI signal (χ2=3.227, P＞0.05), cystic necrosis (χ2=0.658, P＞0.05), peritumoral edema (χ2=0.056, P＞0.05) and bone destruction (χ2=2.588, P＞0.05) were not statistically significant. The former had mostly lobulated, irregular shape, cystic necrosis, hemorrhage and tumor blood flow within the empty signal more common, clear brain tumor interface, significant heterogenous enhancement, narrow base connected with dural, rare dural tail, the latter was mostly round or oval, rare cystic necrosis and hemorrhage, fuzzy brain tumor interface, significant homogenous enhancement, wide base connected with dural, dural tail more common. Twenty cases of HPC showed equal or slightly higher signal on DWI, and the ADC mean was (1.21±0.14)×10-3 mm2/s. In 28 from 31 cases of AM, DWI showed higher or slightly higher signal, 3 cases showed low signal, ADC mean was (0.82±0.12) ×10-3 mm2/s, Which was significantly lower than that of HPC (t=10.39, P＜0.001). When optimal cut point of ADC was 1.07×10-3 mm2/s for diagnosis of HPC and AM, the area under the ROC curve was 0.98±0.01, 95% confidence intervals was 0.95—1.00, the sensitivity, specificity and accuracy was 90%, 100% and 90%. Conclusions: The MRI features are helpful in differential diagnosis of HPC and AM, ADC values can be applied as a complementary tool in the  differential diagnosis of them, which can increase the diagnostic accuracy.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparison of 3D-ASL and 1H-MRS magnetic resonance imaging techniques for the preoperative grading of brain glioma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.005</link>
<description><![CDATA[Objective: To investigate the value of three-dimensional arterial spin labeling (3D-ASL) MR perfusion imaging and 1H-magnetic resonance spectroscopy (1H-MRS) metabolite in grading the cerebral gliomas. Materials and Methods: 3D-ASL and 1H-MRS imaging of total 44 patients with pathologically- proved gliomas were retrospectively analyzed. According to the 2007 World Health Organization (WHO) standards, the patients were divided into low-grade glioma group (gradeⅠ— Ⅱ, 13 cases) and high-grade glioma group (grade Ⅲ—Ⅳ, 31 cases), measuring and calculating the values or relative values of CBF and metabolites of the tumor parenchyma and corresponding contralateral tissue for statistical analysis. Results: In the 44 cases of glioma, 3D-ASL related parameters (TBFmax, rCBF1, rCBF2) and 1H-MRS related parameters (rNAA, rCr, Cho/Cr, NAA/Cho) had statistically significant differences in the low-grade and the high-grade glioma group (P＜0.05), and 1H-MRS parameters (rCho, NAA/Cr) had no statistically significant differences between the two groups (P＞0.05). By receiver operating characteristic curve (ROC) analysis, the AUC of TBFmax, rCBF1, rCBF2 and rNAA, rCr, Cho/Cr, NAA/Cho was larger than 0.5 in glioma grades, while the AUC of 3D-ASL was 0.923 and the AUC of 1H-MRS was 0.871, both were lesser than the AUC of 3D-ASL plus 1H-MRS combination (0.955). The sensitivity and specificity of combining the two technologies in differentiating glioma grades were 87.1% and 100% respectively. Conclusions: Separately analysising 3D-ASL and 1H-MRS, 3D-ASL has a higher diagnostic value. combining the two technologies, which can complement each other, has a higher diagnostic value than 3D-ASL or 1H-MRS in differentiating glioma grades.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[MR imaging findings and differential MRI diagnosis of hypertropic pachymeningitis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.006</link>
<description><![CDATA[Objective: T o investigate MR imaging findings of hypertropic pachymeningitis (HP) and improve the diagnostic accuracy of HP. Materials and Methods: We retrospectively analyzed MRI data of 7 patients with HP confirmed by clinic and pathology between July 2013 to June 2016 in our hospital. The characteristics of MRI were summarized. Results: In 7 cases of HP, 2 cases involved spinal dura matter, and 5 cases involved multiple cerebral dura matter. All 7 cases showed dural thickening. 6 cases showed isointense on T1WI and hypointense on T2WI, 2 cases of them showed hyperintense in the edge on T2WI. Only 1 case showed hypo-intensity signal on T1WI and hyperintense on T2WI. The thickening dura matter of 7 cases showed obvious enhancement. Three cases involved cerebral parenchyma or spinal cord, and abnormal enhancement of pia matter could be found. Conclusions: HP is characterized by extensive and uneven thickening of dura matter, which shows hypointense on T2WI and obvious enhancement, and may accompany with involvement of pia matter, cerebral parenchyma or spinal cord.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Evaluation of the role of 3D-T2-DRIVE combining 3D TOF MRA in diagnosing microvascular compression for facial-acoustic nerves]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.007</link>
<description><![CDATA[Objective: To evaluate the application value of 3D-T2-DRIVE combining 3D TOF MRA in detecting microvascular compression for facial-acoustic nerves. Materials and Methods: Thirty-six patients were enrolled in the study with clinically suspected vascular compression of facial-acoustic nerves, of which both 3D-T2-DRIVE and 3D TOFMRA sequences images were obtained of isotropy and identical voxel size. Source images and reformatted images were observed to evaluate the effects on demonstration of facial-acoustic nerves and culprit vessels, which was scored from 0 to 3 points in the order from poor to excellent. The differences were compared of effects on displaying both the facial-acoustic nerves and culprit vessels among the three approaches of 3D-T2-DRIVE, 3D TOFMRA, and 3D-T2-DRIVE+3D TOFMRA. The Kruskal-Wallis H test was employed in data processing, with P＜0.01 for the statistically significant difference. Results: In displaying facial-acoustic nerves, 3D-T2-DRIVE+3D TOFMRA and T2-3D-DRIVE were superior to 3D TOFMRA (H=58.78, P=0.0000. H=53.18, P=0.0000. respectively), and no statistically significant difference existed between 3D-T2-DRIVE+3D TOFMRA and T2-3D-DRIVE (H=2.28, P=0.1313). In displaying culprit vessels, 3D-T2-DRIVE+3D TOFMRA was superior to T2-3D-DRIVE and 3D TOFMRA (H=54.12, P=0.0000. H=62.42, P=0.0000. respectively), and no statistically significant difference existed between 3D-T2-DRIVE and 3D TOFMRA (H=0.0083, P=0.9274). Of 36 patients, 32 were detected with arteriolar compression for facial-acoustic nerves by the approach of 3D-T2-DRIVE combining 3D TOFMRA, and 4 with no compression. The results were confirmed by surgical findings or clinical follow-up, respectively. The sensitivity and specificity was 100%, 100% of 3D-T2-DRIVE+3D TOFMRA in diagnosing microvascular compression for facial-acoustic nerves, respectively. Conclusions: The approach of 3D-T2-DRIVE combining 3D TOF MRA provides an precise and accurate diagnosis of micorvascular compression for facial-acoustic nerves.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Value of dynamic contrast-enhancement MRI for the prediction of chemoradiotheray efficacy in nasopharyngeal carcinoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.008</link>
<description><![CDATA[Objective: To prospectively evaluate the efficacy of pre-treatment DCE-MRI for treatment response to chemoradiotherapy (CRT) of nasopharyngeal carcinoma. Materials and Methods: Thirty-seven patients with confirmed NPC by biopsy pathology underwent MRI plain scan and DCE-MRI before concurrent chemoradiation. Calculate the mean, maximum and minimum area of the semiquantitative parameters. Reexamined those patients with MRI during treatment (receiving dose of 56 Gy) and measure the tumor regression rate respectively. Classified patients into responders and nonresponders, based on RECIST 1.1. Spearman correlation analysis was examed between both pre-treatment mean, hign enhancement and low enhancement area of the semiquantitative parameters and regression rate,respectively. ROC analyses were used to determine the best model to discriminate responders from nonresponders. Results: Among all the parameters, there was a significant negative correlation between tumor regression rate and maximum TTP. When use TTP＜65.53s as a cutoff, we observed AUC=0.843 with sensitivity and specificity is 100% and 43.33% respectively in differentiating CR (n=7) from others (n=30). Conclusions: Semiquantitative parameters derive from DCE-MRI before treatment were capable to predict early treatment efficacy during concurrent chemoradiation in nasopharyngeal carcinoma, which has potential to be helpful in individualized therapy.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparison of SWI and dynamic contrast-enhanced MRI imaging in the diagnosis of small hepatocellular carcinoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.009</link>
<description><![CDATA[Objective: Comparison of susceptibility weighted imaging and dynamic contrast-enhanced MR imaging in the diagnosis of small hepatocellular carcinoma and to explore the clinical application value of SWI in small hepatocellular carcinoma. Materials and Methods: SWI and dynamic contrast-enhanced MR imaging were performed on 60 patients with small hepatocellular carcinoma, And an independent diagnosis was made by three high-year-funded diagnostic radiology doctors, and The results were compared and analyzed statistically. Double blind method was used in this study. Results: In 60 cases of small hepatocellular carcinoma, 48 cases were positive by SWI scan, 12 cases were negative, 50 cases were positive by MRI scan, 10 cases were negative. Statistical analysis showed that there was no significant difference between the two scanning methods in the diagnosis of small hepatocellular carcinoma (P＜0.05). Conclusions: This study found that MRI enhanced scanning in the diagnosis of small hepatocellular carcinoma was a routine clinical application and high reliability of diagnostic methods, SWI scan could be used as a supplementary sequence of MRI enhanced scan. SWI was used to dynamically track the change of hepatic cirrhosis nodules, which has important clinical value in the early diagnosis of HCC. However, the MRI enhancement scan of small hepatocellular carcinoma could not be replaced.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of whole-body diffusion-weighted imaging on gastrointestinal malignant tumors]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.010</link>
<description><![CDATA[Objective: To discuss the technical feasibility of whole body diffusion weighted imaging (WB-DWI) on 3.0 T magnetic resonance imaging (MRI).To evaluate the auxiliary diagnostic role of WB-DWI in patients with gastrointestinal malignant tumors by detection of primary tumors and metastasis. Materials and Methods: Nineteen patients with gastrointestinal malignancy operation history were enrolled in our study. All patients received whole body MRI examination. The magnetic resonance (MR) examination was performed on 3.0 T MR scanner using coils. The images were reviewed separately by two radiologists. Results: A total of 8 metastatic lesions in 4 regions of 7 patients were detected by whole body DWI. One patient with stomach cancer had both liver metastasis and lymph nodes metastasis. Conclusions: The WB-DWI images that meet the diagnostic needs can be obtained on 3.0 T MRI. WB-DWI reveals excellent detection of metastasis of gastrointestinal malignant tumors.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[The diagnosis values of CT and MR imaging index for pelvic lymph node metastasis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.011</link>
<description><![CDATA[Objective: To investigate the diagnosis values of CT and MR imaging index for pelvic lymph node metastasis. Materials and Methods: From September 2011 to February 2015, selected 56 cervical cancer diagnosed patients in Fangxian people's hospital department of oncology, all patients were performed CT and MR imaging detection and contrast, and pathological analysis was performed. Results: In the 56 patients, clinical judgment of lymph node metastasis were 38 patients, the metastasis was 67.9%. CT analysis showed that patients with lymph node metastasis of lymph nodes as the prototype, the central necrosis, and more with the presence of extracapsular invasion, and the size of lymph nodes were significantly higher than that of patients without lymph node metastasis (P＜0.05). MRI DWI images showed ADC in patients with lymph node metastasis were significantly lower than in patients without lymph node metastasis (P＜0.05), but the eADC were significantly higher (P＜0.05). And compared to the pathologic findings, the sensitivity of CT and MRI in the diagnosis of lymph node metastasis were 97.4% and 100.0%, specificity were all 100%, there was no statistically significant difference between the two groups (P＞0.05).]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Effect of gadolinium on vertebral fat fraction content using IDEAL-IQ technique]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.012</link>
<description><![CDATA[Objective: This study evaluates the robustness of a magnetic resonance (MR) fat quantification method to changes in R2* caused by an intravenous infusion of gadolinium. Materials and Methods: The R2* and fat fraction content (FF) were measured in vertebral marrow in eight New Zealand white rabbits using an investigational sequence (IDEAL IQ) provided by the MR scanner vendor. Measurements were made once before and twice after Gd-BOPTA infusion (5 min, 30 min). Then HE stain was performed for calculating vertebral fat content (FCHIS), Prussian blue stain was performed for showing iron in vertebral. Results: Vertebral marrow FF measurements revealed no significant systematic bias between the three measurements (P＞0.05 for all). Good agreement (95% confidence interval) of FF measurements were demonstrated between FF0 min and FF5 min (0.90, 1.10) and FF0 min and FF30  min (0.94, 1.07). A significant positive correlation is found between FF0 min and FCHIS (r=0.813, P＜0.05). R2* increased after administration of gadolinium. Conclusion: Although under the impact of an increased R2* in vertebral marrow post-contrast, the investigational sequence can still obtain accurate and stable fat fraction content. the IDEAL IQ method of fat quantification is robust to changes in R2*.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[A method of TMS coil positioning based on functional and structural MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.013</link>
<description><![CDATA[Transcranial magnetic stimulation (TMS) has been widely applied to clinical therapy, the accuracy of coil positioning in brain functional areas is crucial for TMS effects. In recent years, neuronavigation-guided TMS has greatly improved the accuracy, but require a variety of equipment, which cannot be deployed in every circumstance, such as MRI scanning. And navigation system is expensive, some TMS without navigation, then how to position the TMS coil is a problem. In this paper we provide a method of TMS coil positioning based on magnetic resonance imaging (MRI). Here, using repetitive TMS (rTMS) treatment of aphasia as an example, collecting high-resolution T1WI and functional MRI data of the speech-language tasks. The data were analyzed using SPM8, and the 3D brain activation map was built with MRIcron software, then marking the coordinate of rTMS stimulation site and another coordinate of the landmark on the scalp. Finally, the rTMS stimulation site can be determined in an individual head according to the marks and coordinates relations. The procedure to determine TMS stimulation site is carried out on individual's own structure, with advantages of high accuracy, simple operation, easy to implement and cost savings. This method can be applied flexibly.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Advances in the study of brain structure and function of migraine with MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.016</link>
<description><![CDATA[As an primary headache disorder, migraine is characteri zed by moderate to severe pain, which consists of unilateral and pulsating headache attacks that are typically aggravated by physical activity ,and accompanied by nausea and vomiting, photophobia, pho nophobia and other neurological, gastrointestinal, autonomic sympto-ms. Causes significant individual and societal burdens as a result of pain, such as environmental sensitivity, disability and even lost prod uctivity. Recently, advanced neuroimaging has led to an evolution in our perception of migraine pathophysiology. Numerous neuroima ging studies have detected alterations in brain structure and function in patients with migraine.In this article, we will make a retrospec tive analysis of the brain structure and function of migraine, which is shown by magnetic resonance imaging.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Progress of functional magnetic resonance imaging in chronic pain]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.11.017</link>
<description><![CDATA[Chronic pain is a disease related to the physical and psychological of the human body. In the past decades, researchers have carried out a large quantity of functional Magnetic Resonance Imaging (fMRI) studies on chronic pain. In the current paper, we tried to provide a review of previous resting state fMRI studies focusing on the following aspects: characteristics of chronic pain, research methods of resting state fMRI for chronic pain, experiment and analysis.]]></description>
<pubDate>Sun,20 Nov 2016 00:00:00  GMT</pubDate>
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