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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=201405</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[A resting-state functional MRI study in Parkinson’s disease]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.001</link>
<description><![CDATA[Objectives: Blood-oxygen-level dependent functional magnetic resonance imaging (BOLD-fMRI) was used to investigate the resting-state brain functional abnormalities in patients with Parkinson's disease (PD). Materials and Methods: Totally 68 clinically diagnosed PD patients with at least 12 hours withdrawal time and age- and gender-matched 36 normal controls (NC) were included to take clinical scale evaluation and resting-state BOLD-fMRI examination. All subjects were scanned with Philips 3.0 Tesla MRI system. The fMRI data were processed and analysed by DPARSF V2.0 soft and REST V1.8 soft. Two-sample t-test was used to examine the mALFF differences between PD group and NC group. Results: Compared to NC group, PD group had significantly decreased mALFF values in extensive brain regions including bilateral SMA, middle and posterior cingulate cortex, precuneus, hippocampus, parahippocampal gyrus, lateral globus pallidus, dorsal thalamus, anterior lobe of cerebellum, and right local primary motor cortex, insular cortex, caudate nucleus, putamen, posterior lobe of cerebellum as well as increased mALFF values in several brain regions including extensive cortex of bilateral anterior frontal, parietal and temporal lobe, and left occipital primary visual cortex (P<0.05, AlphaSim corrected). Conclusions: Resting-state brain functional abnormalities of PD patients are extensive. The neuronal activity decreases mainly in several areas including motor regulation related brain regions, default mode network and limbic system, and increases mainly in extensive cortex of anterior frontal, parietal, temporal lobe and primary visual cortex.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of susceptibility weighted imaging in acute massive cerebral infarction complicated by hemorrhage]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.002</link>
<description><![CDATA[Objective: To investigate the value of susceptibility weighted imaging (SWI) for diagnosing acute massive cerebral infarction complicated by hemorrhage (ACIH) by 3.0 T MRI. Materials and Methods: 67 cases of ACIH underwent MRI scanning, the difference of detection rate of hemorrhagic lesions in ACIH was compared between routine sequences (T1WI, T2WI, FLAIR, DWI) and SWI sequence. Results: Of 67 cases ACIH, the conventional sequence detected bleeding lesions in 59 cases, the detection rate of 88.06%. SWI sequence detected 67 cases with the rate of 100%. The detection rate of ACIH with SWI sequence was higher than conventional sequences, the difference was significant. Occult hemorrhage showed the same signal with cerebral infarction without being detected in routine sequences, and clear low signal in SWI sequence. All the area [average (4.32±0.67) cm2] of cerebral hemorrhage in cerebral infarction with SWI sequence were greater than conventional MR sequences [average (2.87±0.48) cm2], the difference was statistically significant. Conclusions: SWI sequence can early detect more hemorrhage lesions than conventional sequences in ACIH, this sequence should be used as supplemental method of massive cerebral infarction.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[A fMRI study of cerebral regions activiated by acupuncture of Dazhong acupoint]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.003</link>
<description><![CDATA[Objective: To discuss the cerebral activating effects of acupuncturing dazhong acupoint by function magnetic resonance imaging (fMRI). Materials and Methods: Twelve cases of healthy young volunteers were Choosed. Acupuncture subjects was the right side dazhong acupoint (luo acupoint). 3.0 T magnetic resonance was used to scan the brain. The obtained experimental data were processed and analyzed by SPM8 (statistical parametric mapping) software. Results: Acupuncturing subjects dazhong acupoint activated anterior cerebellar lobe, the left inferior temporal gyrus BA37, the left middle temporal gyrus BA38, BA39, left temporal pole BA38, right temporal pole BA32, the left side of the brain stem, the left globus pallidus, the right middle frontal gyrus BA6 and the left superior frontal gyrus BA6. Conclusions: Acupuncturing dazhong acupoint that avtivates the brain areas are mainly located in frontal lobe, temporal lobe, anterior cerebellar lobe, brain stem and globus pallidus. Their main function is responsible for the afferent of body sensory impulse. They are consistent with the somatosensory centre of heel pain and waist pain in the brain.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[MRI diagnostic value of pituitary stalk interruption syndrome]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.004</link>
<description><![CDATA[Objective:  To analyze MRI features of pituitary stalk interruption syndrome to improve diagnostic level. Materials and Methods: The clinical and MRI features of 15 patients with pituitary stalk interruption syndrome proved by MRI were retrospectively analyzed. Results: In all 15 cases, it happened growth hormone deficiency, 2 cases for a single growth hormone deficiency,the rest 13 cases combined with multiple hormone deficiency. With MRI examination,the pituitary stalk was not shown in all 15 cases and ectopic posterior lobe located in infundibulum in all 15 cases,decreased anterior lobe with normal signal in 13 cases, normal height and signal anterior lobe in 2 cases. Conclusion: MRI findings of pituitary stalk interruption syndrome were characteristic, MRI was the best imaging modality for the diagnosis of pituitary stalk interrup tion syndrome.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[MR findings of brain after heat stroke]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.005</link>
<description><![CDATA[Objective: To investigate the MR findings of brain after heat stroke. Materials and Methods: Eight cases of patients diagnosed heat stroke by clinical methords were selected. The MR studies including T1WI, T2WI, T2-FLAIR, DWI, SWI were performed for 2—5 days after heat stroke. Five patients were followed up by the same MR studies with 2—4 times. Results: Among eight cases with heat stroke, five patients were detected abnormal signals which located at brain stem, cerebellar dentate nucleus, cerebellum feet, cerebellum, hippocampus, corona radiate, semi oval center and right frontal-temporal-parietal lobe. The lesions including micro hemorrhage, cytotoxic edema, vasogenic edema, hemorrhagic infarction, encephalitis. Symmetrical distribution were displayed for cerebellar lesions. Conclusions: Heat stroke can cause cerebral lesions such as ischemia, hemorrhage, infarction and inflammation. MR findings have certain characteristics which often involved in the cerebellum symmetrically.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Non-contrast-enhanced MR angiography using spatial labeling with multiple inversion pulses sequence imaging in pulmonary artery: a feasibility study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.006</link>
<description><![CDATA[Objective: The purpose of this study was to demonstrate the feasibility of a non-contrast-enhanced magnetic resonance angiography (MRA) sequence, Multiple Inversion Pulses Sequence (SLEEK), used in pulmonary artery, and to explore the optimum blood-suppression inversion time (BSP-TI) for good image quality. Materials and Methods: Fourteen healthy volunteers who had no contraindications to MRI and no recent health problems or surgeries were recruited in the study. All subjects were performed at a 1.5 T MRI system for assessing pulmonary artery. The ability to present four segments (① pulmonary trunk. ② main right and left pulmonary arteries.  ③ interlobar arteries. ④ segmental arteries bilaterally) were evaluated independently by two radiologists using a four-point scale. Relative signal- to-noise ratio (SNR) and contrast-to-noise ratio (CNR) also were determined. Results: Thirteen volunteers were successfully performed SLEEK MRA, only one volunteer failed because of irregular respiration. The subjective image quality was significantly better with BSP-TI 700 ms and 900 ms than with 500 ms, 1100 ms and 1300 ms (P<0.05). The CNR and relative SNR of pulmonary artery were significantly better with BSP-TI 700 ms than with 500 ms (P<0.05), though showed no significantly better than with 900 ms, 1100 ms and 1300 ms (P>0.05), taking into the pulmonary venous contamination consideration (1100 ms 5/13, 1300ms 9/13), the image quality with BSP-TI 700 ms for pulmonary artery was significantly better than with others. Conclusions: Performing non-contrast-enhanced MRA with SLEEK sequence can achieve clear vessel delineation both in central and peripheral pulmonary arteries with the BSP-TI of 700 ms.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Fabry’s disease: clinical features and imaging findings]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.007</link>
<description><![CDATA[Objective: One typical case with Fabry's disease was reported and a series of clinincal and imaging characteristics were reviewed to identify different types of cardiomyopathy. Materials and Methods: A 49-year-old male patient presented chest pain. ECG, echocardiography, selective coronary artery angiography and MR1 were performed. Results: ECG showed left ventricular hypertrophy, first degree of atrioventricular block and ST-T change. Echocardiography showed left ventricular hypertrophy, left ventricular outflow obstruction and SAM sign (+). Selective coronary artery angiography demonstrated no coronary artery stenosis. MRI showed diffuse myocardial hypertrophy associated with delayed enhancement involving septal, anterial and inferolateral wall of basal segment of left ventricle. Conclusions: Patients with Fabry’s disease may have varied clinical manifestations. Clincal history, multisystemic involvement and delayed enhancement MRI may be helpful to the diagnosis.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of Enema Glycerine applying in preoperative MRI T1 staging and T2 staging of rectal cancer]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.008</link>
<description><![CDATA[Objective: To evaluate the value of Enema Glycerine applied in preoperative MRI T1 staging and T2 staging of rectal cancer. Materials and Methods: The MRI datum of 81 cases of pathologically confirmed T1 staging or T2 staging of rectal cancer suffers after operation (50 males and 31 females whose ages, 64.2±12.2 on average, range from 31 to 88), were collected retroactively, from september 2005 to december 2013, in PUMCH. Patients involved were examined by MRI within two weeks before the operation. In this study, 45 patients (30 males and 15 females) had used the Enema Glycerine. While the other 36 cases (21 males and 15 females) had no used it. So these cases were assigned to two groups. The thesis utilized Kappa test to analyze the consistency between the preoperative MRI T staging and the postoperative pathological staging of in each group, and calculated the sensitivity, specificity, accuracy, positive predictive value and negative predictive value of the MRI T1 staging, T2 staging, and the the sensitivity of T1+T2 staging, and compared them, respectively. Results: Kappa tests (K=0.693 and K=0.537) showed the two groups, including applying the Enema Glycerine and no applying the Enema Glycerine, have good consistency of the preoperative MRI T staging and the postoperative pathological staging. Respectively, in the group applying the Enema Glycerine, the sensitivity, specificity, accuracy, positive predictive value and negative predictive value of the MRI T1 staging were 76.5%, 92.9%, 86.7%, 86.7% and 86.7%. Those of the MRI T2 staging were 78.6%, 76.5%, 86.7%, 84.5% and 68.4%. The sensitivity of the MRI T1+T2 staging was 77.8%. In the other group, no applying the Enema Glycerine, the sensitivity, specificity, accuracy, positive predictive value and negative predictive value of the MRI T1 staging were 57.1%, 95.5%, 80.6%, 88.9% and 77.8%. Those of the MRI T2 staging were 77.3%, 57.1%, 69.4%, 73.9% and 61.5%. The sensitivity of the MRI T1+T2 staging was 69.4%. The statistic analysis show the sensitivity of the MRI T1 staging, the specificity and the accuracy of MRI T2 staging of the group applying the Enema Glycerine were higher than that of the group no applying the Enema Glycerine (P<0.05, single-side hypothesis testing). Conclusions: There is higher value of Enema Glycerine, which can significantly improve the sensitivity of the preoperative MRI T1 staging, the specificity and accuracy of T2 staging, and simultaneously improve partly the diagnosis accuracy of the MRI T1 staging and T1+T2 staging, applied in preoperative MRI examination of rectal cancer and thus it should be one of the conventional application.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[MR cholangiopancreatography showed four-segment-sign of chronic pancreatitis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.009</link>
<description><![CDATA[Objective: To investigate chronic pancreatitis whose MR cholangiopancreato- graphy (MRCP) showed four-segment-sign. Materials and Methods: Retrospective analysis of pathologically confirmed clinic and imaging data of four chronic pancreatitis cases, all of which had been undergone CT enhanced scanning and MRCP examination before surgery, and one case with further MRI enhanced scanning. Results: Three out of four cases have mass in the pancreatic head, one case no significant mass, two cases showed slightly low density mass at each CT enhancement stage compared with normal parenchyma, one case equal density mass, one case no abnormal contrast enhancement, one case showed slightly lower signal mass at each MRI enhancement stage compared with the normal parenchyma with duct-penetrating sign at portal venous phase. All four cases showed the four-segment-sign in MRCP. Conclusions: MRCP of chronic pancreatitis can be expressed as four-segment-sign, more common occurrence in mass-type focal pancreatitis. Four-segment-sign is not specific signs of pancreatic cancer, and further diagnosis is depends on enhanced CT or MRI scanning.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of diffusion-weighted MRI in the assessment of cervical cancer]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.010</link>
<description><![CDATA[Objective: To investigate the potential value of diffusion weighted imaging (DWI) and the apparent diffusion coefficient (ADC) for staging and predicting short-term treatment response to nonsurgical therapy (chemo- and/or radiotherapy) of patients with cervical cancer. Materials and Methods: Sixty-eight patients with cervical cancer underwent DWI in addition to routine MR imaging at MRI before therapy. The staging accuracy by routine MRI sequences and routine MRI combined with DWI was compared with surgical specimens as the reference standard. All ADCs were calculated from b=0, 800 s/mm2 and the correlation between ADC and histologic stages of cervical cancer was evaluated. Thirty-eight patients were followed up after nonsurgical therapy and divided into complete response (CR) group and partial response (PR) group according to the results of follow-up. Difference of ADC between the two groups was compared with student’s t test. Results: (1) One stage Ib case of missed diagnosis occurred as routine MRI adopted and all cases of cervical cancer were found out by routine MRI combined with DWI. The accuracy of routine MRI for staging IIa was 85%and the combined use of routine MRI and DWI made accuracy 95%, yet there was not statistically significance between the two methods. (2) ADC value of each stage of cervical cancer was compared and no statistically significance was found (P>0.05). There was no correlation between ADC values and all stages. (3) The mean pre-therapy ADC value of CR group (n=25) and PR group (n=13) was 1.02×10-3 mm2/s and 1.14×10-3 mm2/s respectively. There was a statistically significant difference between the two groups (P<0.05). Conclusions: Routine MRI combined with DWI has high accuracy for detecting and staging of cervical cancer. ADC could predict short-term treatment response to nonsurgical therapy for patients with cervical cancer.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Differentiation of early cirrhosis from liver fibrosis: FA of DTI superior to ADC of DWI from the MRI findings in a rodent model study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.011</link>
<description><![CDATA[Objective: To evaluate and compare the FA of DTI and the ADC of DWI in differentiating liver fibrosis and early liver cirrhosis in a rodent model study. Materials and Methods: This study was approved by the animal Ethics Committee in our hospital. 12 rodent models, including liver fibrosis (7 in total with 2 in grade II and 5 in grade III from pathologic exam) and cirrhosis (5 pathologically confirmed) ones, were established though periodical carbon tetrachloride (CCl4) injection to Wistar male rats with another 6 intact as the control. The MR exams were performed on a 1.5 T scanner (GE HDx, Mikauwee) using a wrist joint coil with the protocol including the routine T1WI, T2WI and DWI and DTI. For the objectiveness of comparison the scanning parameters were set basically identical for DWI and DTI, where FOV=16 cm×12 cm with a matrix of 192×128, slice thickness=3 mm and b=0, 500 s/mm2 with on 6 orthogonal directions applied for DTI. The MR images were blindly reviewed and analyzed by two experienced observers with the values of ADC and FA of the right liver lobe measured using the Functool on GE ADW 4.4 workstation. The ADC values of DWI and DTI, and FA values of DTI were statistically analyzed using software SPSS 13.0 with P<0.05 considered statistical significant. Results: A pounced trend in a decreasing manner was observed in the ADC values of both DWI and DTI from the control group to the liver fibrosis group, then to the early cirrhosis group. However, significant difference was only observed in the comparison of the control group respectively to the fibrosis and early cirrhosis groups (P<0.05), while not between the liver fibrosis and early cirrhosis groups. The FA values of DTI exhibited an increasing trend from the control to liver fibrosis, then to early liver cirrhosis groups, with statistically significant differences between each group observed (P<0.05). Conclusions: The FA of DTI showed a stronger capability than the ADC values of DWI and DTI in differentiating the early cirrhosis from liver fibrosis.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Investigating human brain cognition using spiral imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.012</link>
<description><![CDATA[Human brain cognition has been mostly investigated with single-short echo-planar imaging (EPI) in order to cover the whole brain within a few seconds. However, the duration of EPI readout is relatively long because it utilizes a Cartesian trajectory to cover k-space and only Gx gradient contributes to the trajectory. The longer duration can result in substantial artifacts from off-resonance and gradient imperfections. Moreover, EPI is sensitive to motion because the first-and higher order moments of the gradient waveforms near the k-space origin is large. Here we present another fast imaging technique, namely spiral imaging for the study of human brain cognition. Spiral samples an Archimedean or similar trajectory to cover k-space that either begins at the k-space center and spirals to the edge (spiral-out), or begins at the edge and ends at the origin (spiral-in). The readout duration of spiral is shorter than that of EPI due to its efficient use of both Gx and Gy gradients to drive the trajectory, and its sensitivity to motion is lower since the gradient moments are low at the center of k-space and increase slowly with time. Spiral is a promising imaging technique in terms of breaking the bottle neck in EPI study of human brain cognition. Specifically, the use of spiral-in/out trajectories in which a spiral-in readout is followed by a spiral-out can simultaneously increase the SNR in uniform brain regions as well as to reduce the signal dropout in regions compromised by susceptibility-induced field gradients. Furthermore, a variable-density spiral, which consists of an Archimedean spiral from the space origin to a user-specified k-space radius and a undersampled variable density spiral from the specified points to the maximum radius, can achieve high temporal and spatial resolution fMRI without loss of SNR using single-short.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Research progress in bio-responsive MRI contrast agent]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.014</link>
<description><![CDATA[Different tissues and diseases have specific biological signals. The development of magnetic resonance imaging (MRI) contrast agents responding to these signals can not only improve the sensitivity of disease detection by MRI, but also increase the accuracy of disease diagnosis through molecular imaging of these disease signals. This paper gives a review of MRI contrast agents responding to albumin, pH, metal ion, enzyme, redox and other biological signals with the focus on the latest developments and perspectives.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[The present situation of pulmonary embolism magnetic resonance imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.015</link>
<description><![CDATA[Pulmonary embolism (PE) is a potentially life-threatening disease that requires timely and accurate diagnosis and management. In recent years，with the rapid development of software and hardware, the study of pulmonary embolism magnetic resonance imaging is very popular. This review focus on the examination techniques, common scan sequences, contrast medium and diagnosis accuracy of pulmonary embolism MRI, and predict its tendency in the future.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Current research and progress of hemodynamics on hepatic blood supply]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.016</link>
<description><![CDATA[The hepatic blood is typically supplied by both portal vein and hepatic artery. Clinical researches revealed that hemodynamic changes could be caused by hepatic diseases, and also the hemodynamic changes were associated with the development or deteriorate of hepatic diseases. By retrospect and summary of the methods, clinical measures and relative studies on hepatic hemodynamics, the effect and value of hepatic hemodynamics on diagnosis and interventional treatment of hepatic diseases were discussed. A multiple interdisciplinary method coupling medicine and engineering would be developed for surveying the hepatic hemodynamics, and it will be helpful to give hemodynamic evidences and guidance for the diagnosis or treatment of hepatic diseases.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Research progress of functional magnetic resonance imaging in migraine]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.05.017</link>
<description><![CDATA[Characterized by repeated pain attacks, migraine has been recognized as a kind of chronic dysfunctional disease. In the past decades, researcher have carried out a large quantity of functional magnetic resonance imaging (fMRI) studies on migraine. In the current paper, we tried to provide a review of previous fMRI studies focusing on the following three aspects: the neuro-mechanisms of migraine, the dysfunctions of resting state brain networks of migraine and fMRI studies involving migraine and acupuncture.]]></description>
<pubDate>Tue,20 May 2014 00:00:00  GMT</pubDate>
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