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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=201701</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[Evaluation research of MRI equipment and its clinical application: supported by the National Key Research and Development Program]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.001</link>
<description><![CDATA["Evaluation research of MRI equipment and its clinical application" project is supported by the National Key Research and Development Program, as well as 24 million yuan funding support. The project, through the study of seven sub subject system, will carry out the clinical application of MRI, technical performance, reliability and service system of the present situation investigation. Finally, it will complete the MRI report demand in our country, establish the evaluation standard and evaluation report of MRI clinical function and practicality, clinical effect, reliability, technical performance and service system of MRI in our country. In order to build the MRI evaluation methods and tools with independent intellectual property rights in our country, promote China-made MRI equipments as a whole to enter the international advanced level.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The correlation between the distribution and signal intensity of middle cerebral artery atherosclerotic plaques and acute infarction: a 3.0 T high-resolution MRI study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.002</link>
<description><![CDATA[Objective: To investigate the correlation between the distribution and signal intensity of middle cerebral artery (MCA) atherosclerotic plaques and acute infraction using high-resolution magnetic resonance imaging. Materials and Methods: Thirty-two consecutive symptomatic patients with atherosclerotic MCA stenosis were imaged with a 3.0 T magnetic resonance scanner. The HR MRI protocol included T1-weighted, T2-weighted black blood imaging. The patients were divided into acute infarction group and non-acute infarction group, according to hyperintense on DWI or not. The locations of plaques were classified into ventral wall, inferior wall, dorsal wall, superior wall. Signal intensity of plaques were recorded as hyperintense or mixed singal intense. Results: Thirty-two cases were enrolled. 13 plaques were located at the ventral wall, 7 at the inferior wall, 4 at the dorsal wall, 4 at the superior wall, and 4 with lumen occlusion. The acute infarction in corresponding place were 2, 2, 3, 4. The plaques located at dorsal or superior wall were more susceptible to acute infarction (P=0.002). There were 8 plaques with hyperintense or mixed singal intense (SI) on T1WI or T2WI in acute infarction group, while 2 plaques like that in non-acute infarction group, the difference had statistical significance (P=0.021). Conclusions: Middle cerebral artery atherosclerotic plaques have certain tendency to locate at ventral and inferior wall, but plaques at dorsal or superior wall were more susceptible to acute infarction . The plaques with hyperintense or mixed singal intense were more likely to occur in acute infarction cases.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Quantitative 1H-MRS study of metabolite characteristics of autism spectrum disorders in basal ganglia regions]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.003</link>
<description><![CDATA[Objective: To investigate the metabolite changes in the basal ganglia regions of autistic children using 1H-MRS and LCModel. Materials and Methods: Thirteen autistic children and 14 normal developed children were enrolled in the study. MRS data were acquired in the bilateral basal regions and processed by LCModel software. Results: Compared with normal developed children, the absolute concentration of Glx, Glu and Cho in bilateral basal ganglia regions were increased with statistical significance. The ratio of Glx/Cr, Glu/Cr in bilateral basal ganglia and Cho/Cr in the right basal ganglia of autistic children was increased with statistical significance. The absolute concentration of NAA in bilateral basal ganglia of autistic children was decreased without statistical significance, while the ratio of NAA/Cr in bilateral basal ganglia was decreased with statistical significance. The absolute concentration of MI and the ratio of MI/Cr were increased in bilateral basal ganglia in autistic children without statistical significance. Conclusions: Abnormal metabolite alternation was found in the basal ganglia regions of autistic children. The increase of Glx, Glu, Cho and decrease of NAA/Cr may relate to the pathogenesis of autism.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The preliminary study of aquaporins function with multi b-values diffusion weighted magnetic resonance imaging in the grading diagnosis of cerebral astrocytoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.004</link>
<description><![CDATA[Objective: To investigate the value of aquaporins function with multi b-values diffusion weighted magnetic resonance imaging in the grading diagnosis of astrocytoma. Materials and Methods: Fifty-two patients with cerebral astrocytoma underwent conventional MRI scanning and multi b value DWI scanning before surgery, of which the low-grade group (WHOⅠ—Ⅱgrade) were 24 cases, the high-grade group (WHO Ⅱ—Ⅳgrade) were 28 cases. Measuring the AQP-ADC values and conventional ADC values in tumoral solid part. Using independent sample t-test to compare AQP-ADC values and conventional ADC values between the low-grade group and high-grade group, ROC curve was used to compare the diagnostic performance of AQP-ADC values and conventional ADC values. Results: The AQP-ADC value in tumoral solid part of high-grade group was higher than those of low-grade group, and the conventional ADC value in tumoral solid part of high-grade group was lower than those of low-grade group, the AQP-ADC value and conventional ADC value of tumoral solid part had significant differences between the groups (P＜0.01). The area under the ROC curve (AUC) of AQP-ADC value and conventional ADC value was 0.891, 0.778 respectively. Conclusions: AQP-ADC value in tumoral solid part could be used to identify low grade astrocytoma from high grade astrocytoma, and was better than conventional ADC value.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The diagnostic study of T1-weighted 3D volumetric isotropic TSE acquisition in evaluating characteristics of plaques of middle cerebral artery in acute ischemic stroke of basal ganglia]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.005</link>
<description><![CDATA[Objective: To evaluate the characteristics of plaques of middle cerebral artery (MCA) in acute ischemic stroke of basal ganglia using T1-weighted 3D Volumetric Isotropic TSE Acquisition (T1W 3D-VISTA) and  its clinical relevance. Materials and Methods: Patients with acute ischemic stroke of middle cerebral artery territory, which were diagnosed by DWI, underwent both MRA and T1W 3D-VISTA examinations. Patients were divided into two groups according to the distribution of infarction, one contained basal ganglia (BG, basal ganglia/ basal ganglia as well as the area outside of it) and the other did not contain basal ganglia (N-BG). Distribution of blood vessel walls and the contrast ratio (CR) of signal intensity of the plaques to that of the corpus callosum were compared between BG and N-BG and their clinical characteristics were evaluated. Results: Among 52 patients with cerebral infarction and ipsilateral plaques in M1 (BG 30 and N-BG 22), a total of 1560 image slices were studied. Overall, of the 251 slices with identified plaques, the plaques located at superior wall of BG (37.74%) accounted for a higher proportion as compared with N-BG (10.26%)(P=0.004), and the plaques located at inferior wall (26.42%) and ventral wall (13.21%) of BG accounted for a lower proportion as compared with the plaques located at inferior wall (48.72%) and ventral wall (33.33%) of N-BG (P=0.047 and 0.039,respectively). The average signal intensity (CRs) of plaques of BG was lower as compared with plaques of N-BG (mean, 0.84 and 0.92, respectively, P=0.001). The clinical characteristics (including age, gender, hypertension, diabetes, dyslipidemia, smoking, drinking, BMI, NIHSS score within 24 hours after admission, family history of stroke) had no significant difference between BG and N-BG (P＞0.05). Conclusion: T1W-3D-VISTA can detect the distribution of arterial atherosclerotic plaques and the relative signal intensity. As compared with plaques of N-BG, the plaques of BG are relatively more stable and account for a higher proportion at superior wall and a lower proportion at inferior wall and ventral wall of MCA M1 segment.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Abnormal amplitude of low-frequency fluctuation associated with relapse behavior in heroin addict: a resting-state functional magnetic resonance image study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.006</link>
<description><![CDATA[Objective: T o investigate the characteristics of the relapse related brain function of heroin addicts during the resting state. Materials and Methods: Thirty-one heroin addicts were included in a prospective longitudinal study of resting state functional magnetic resonance imaging. The relapse group and non relapse group were determined after six month-follow-up, and the differences in amplitude of low-frequency fluctuation (ALFF) value between two groups were analyzed. Then the relationship between ALFF value of differential regions and relapse behavior was analyzed. Results: Compared with non relapse group, the relapse group demonstrated significantly greater ALFF value in the right anterior cingulate gyrus, orbitofrontal gyrus and temporal gyrus, demonstrated lower ALFF value in the left parahippocampal gyrus, right posterior cingulate gyrus, bilateral fusiform gyrus and left inferior parietal lobule. No significantly relationship between the ALFF value of differential brain regions and relapse behavior was found. Conclusions: The relapses and non-relapses vary significantly in the brain function, the decline of control function and the abnormal increase of learning and memory function are closely related with relapse behavior. These abnormal functional characteristics have a certain predictive value for the relapse risk of heroin addicts.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Imbalanced communication among brain networks in chronic pain disorder: Meta-analysis of resting-state functional connectivity]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.007</link>
<description><![CDATA[Objective: To describe the change of functional connectivity of resting-state brain in chronic pain status by Meta-analysis. Materials and Methods: A database search was performed in PubMed, EMBASE, Web of Science, and BrainMap for literature published from database establishment to September 2016. Based on inclusion and exclusion criteria, studies supporting fMRI analysis of the resting-state brain in chronic pain were collected. The Talairach coordinates are uniformly transformed into MNI coordinates using Icbm2tal software. Results: Twenty studies were identified with a total of 389 subjects. Meta-analysis showed that chronic pain causes abnormal functioning of the default network. We chose insula as seed, the hyperconnectivity consists between insula and regions of default mode network include anterior cingulate, posterior cingulate, precuneus, inferior parietal lobule and medial prefrontal cortex. Conclusions: Our results suggest that abnormal functional connectivity between insula and default mode networks, may reflect chronic pain towards cognitive control and emotion processing. These findings provide an empirical foundation for a neurocognitive model in which brain network underlies core cognitive and affective abnormalities in chronic pain.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[CT and MRI diagnosis of central nervous system neuroblastomas (a report of 6 cases)]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.008</link>
<description><![CDATA[Objective: To analyze the CT and MR characteristics of central nervous system (CNS) neuroblastomas and explore the diagnostic value of CT and MRI. Materials and Methods: CT and MR imaging features of 6 patients with CNS neuroblastomas confirmed by pathology were analyzed retrospectively. Results: Six patients were enrolled, 5 patients were male and 1 female, their age ranged from 3—24 years old and the average age 13.8 years old. Among them, 3 cases were above tentorium, temporal lobe (1), occipital lobe (1), parietal lobe (1). And 2 cases were below tentorium, fourth ventricle (1) and the pons (1), the rest 1 case was astride left cerebellum tentorium. Two cases were cystic-solid mass, 4 cases were mainly solid mass. The solid part of tumor presented iso-or hypointense on T1WI, iso-or hyperintense on T2WI, and iso-or slightly hyperintense on T2 FLAIR, after contrast, 2 cases with no obvious enhancement, and 4 cases with significant enhancement. The cystic part of tumor displayed hypointense on T1WI, hyperintense on T2WI, and hypointence on FLATR sequence. The tumor were well defined and peritumoral edema was not obvious. On CT, the tumor solid compontent showed iso- or hyper-density, calcification may be seen, and the cystic compontent showed hypo-density. Conclusions: The imaging of CNS neuroblastoma has certain characteristics on CT and MRI. It may help to the diagnosis and differential diagnosis of the disease based on tumor location, boundary, signal (or density), edema, enhancement, etc.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Different cervical flexion positions of MRI in Hirayama disease]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.009</link>
<description><![CDATA[Objective: To investigate different cervical flexion positions in Hirayama disease (HD) for the effects on these MRI features by cervical flexion angle. Materials and Methods: The cervical MR scans were carried out by a self-made equipment with a superconducting 1.5 T system. MRI examinations in different flexion positions (0°, 25°, 30°, 35°, 40°) of 19 patients, who were clinical diagnosed as HD. To summarize three MRI features including  asymmetric cord flattening, anterior shifting of the posterior wall of the cervical dural canal (ASD), widening of cervical epidural space. The maximum sagittal diameters (d) of widened cervical epidural space and the cervical canal sagittal diameters (D) at the same level were measured . The d/D values at different angles were calculated and compared. Results: The appearance of MRI features were different between 0° group and other 4 larger angles groups (P=0.00). The mean d/D value was changing following different angles, reached max value in 35°. Conclusions: Neck flexion angles have effects on ASD, widening of cervical epidural space.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Value of CT and MRI imaging in the diagnosis of hydrosalpinx]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.010</link>
<description><![CDATA[Objective: To study the diagnostic value of CT and MRI for hydrosalpinx. Materials and Methods: The clinical data of 64 patients diagnosed with hydrosalpinx in our hospital between August 2013 and August 2016 were analyzed, and were divided into a control group and an observation group according to the different imaging techniques applied, with 32 cases in each group. The control group was diagnosed by CT, and the observation group by MRI. The specific diagnostic values in the two groups were observed and compared. Results: All the 32 cases were confirmed with cystic masses by CT diagnosis, among which 22 (68.75%) were with clear boundary masses and 4 with bilateral masses (12.50%), with 15 cases (46.88%) with masses in the left adnexa and 13 (40.63%) in the right adnexa, MRI diagnosis showed that, the edge of the masses was smooth, S-shaped or C shaped like sausage. The proportion of missed diagnosis and misdiagnosis in the observation group was 3.12%, lower than the 21.88% in the control group, and diagnosis accuracy was 96.88%, higher than the 78.13% in the control group (P＜0.05). Conclusions: For the diagnosis of hydrosalpinx, MRI is with higher diagnostic value, which can obtain clear imaging data, reduce misdiagnosis or missed diagnosis, and improve the diagnosis accuracy, therefore, it is of significant value to be popularized in clinical application. Besides, in actual practice, CT and MRI could be combined together to play their respective advantages.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Changes in lactate and associated transporters expression in basal ganglia following hypoxic-ischemic brain injury in piglets]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.011</link>
<description><![CDATA[Objective: To investigate the expression characteristics of lactate and associated transporters in basal ganglia following hypoxic-ischemic reperfusion brain injury in a piglet model. Materials and Methods: A total of 35 healthy piglets (3—5 days old, 1.0—1.5 kg) were selected. They were divided into control (n=5) and hypoxic-ischemic (HI) model groups (n=30). The HI model group was further divided into six groups according to 1H-magnetic resonance spectroscopy (1H-MRS) scan times after HI (0—2 h, 2—6 h, 6—12 h, 12—24 h, 24—48 h and 48—72 h; n=5/group). The HI model was established by bilateral common carotid artery occlusion and simultaneous hypoxia treatment for 40 min. Piglets in the control group received the same surgical procedure without the hypoxia-ischemia process. 1H-MRS imaging was performed at various time points after HI. The right basal ganglia was the region of interest (ROI) in 1H-MRS imaging for which data was processed by LcModel software. Animals were euthanized immediately after the last scan and the whole brain was quickly removed and bilateral hemispheres separated. The right hemisphere was used for the pathological examination and immunohistochemical staining of monocarboxylate transporters (MCTs). ANOVA analyses were conducted. P＜0.05 represented statistical significance. Results: (1) The lactate level became reduced after an initial increase, with the maximal level occurring around 2—6 h following HI. (2) The expression of both MCT-2 and MCT-4 in the basal ganglia initially reached a peak value at 12—24 h and decreased thereafter and they were significantly different at 12—24 h after HI compared to the control group and the other time points of the HI model group (P＜0.05). Conclusions: These results indicate that lactate content has potential to regulate the expression of its related transporters in neuronal and glial cell and they have a synergistic effect on the energy metabolism following hypoxic-ischemic reperfusion brain injury.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Study of aquaporin magnetic resonance molecular imaging in transient cerebral ischemia rat model]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.012</link>
<description><![CDATA[Objective: Sought to discern the changes in aquaporin magnetic resonance molecular imaging (AQP MRI) parameter after experimental stroke. Materials and Methods: Thirty-one adult SD male rats were randomly divided into two groups: ischemia group which underwent 1 h right middle cerebral artery occlusion (MCAo) and sham group. T2 FLAIR , conventional DWI and AQP MRI examination was executed 48 h after reperfusion. And AQP4 expression was detected by Western blot and immunofluorescence. Results: The percent change of T2 values of lesions in ischemia group was increased up to 56.655±7.359, which was much higher than that of sham group (vs 2.334±2.203, P＜0.01), whereas the homologous ADC values were remarkably decreased (-24.491±1.924 vs -0.960±3.824, P＜0.01). Result of AQP MRI showed that the percent change of AQP ADC of ischemia group was significantly decreased than that of sham group(-25.218±8.839 vs 0.209±1.279, P＜0.01). Western blot result showed that the AQP4 expression in affected side of ischemia group was higher than that of sham group. Contrastive analysis showed that areas with high AQP ADC values presented low positive staining of AQP4 in immunofluorescence, and areas with low AQP ADC values presented high positive staining. Conclusions: AQP MRI could display the distribution of aquaporin in vivo, which would be of great importance to assess progression of cerebral ischemia.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[New approaches of magnetic resonance on the evaluation of brain glioma grading]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.017</link>
<description><![CDATA[As the most common tumor of central nervous system, brain glioma shows features of outward infiltrative growth, invasiveness and recurrence. The related treatments are rare and, surgical resection is the most preferred method. Early diagnosis and grading of glioma are significant when establish therapeutic approaches and evaluate prognosis of patients. With the development of radiology technologies, Magnetic Resonance Imaging becomes an essential technique for assessing gliomas grading. In this paper, we reviewed several new techniques related to the utility of magnetic resonance imaging on the evaluation of glioma grading.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The fMRI research progress on motor cortex reorganization after brachial plexus injury and nerve transfer]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.018</link>
<description><![CDATA[Brachial plexus avulsion injury (BPAI) is the most severe peripheral nerve injury and typical results in the affected upper limb paralysed, which can be treated by nerve transfer to regain continuity. Nowadays, contralateral C7 nerve transfer has significant effect. According to the task-state and resting-state fMRI studies on brachial plexus injury after nerve transfer, especially contralateral C7 nerve transfer, we think that the change of cerebral motor cortex may follow certain regularity and mechanism. The regularity and mechanism may take a good effect on future research and clinical work.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Analysis of the main factors affecting quantitative dynamic contrast-enhanced MR imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.01.019</link>
<description><![CDATA[DCE-MRI is based on the serial acquisition of the fast T1WI. Through multi-phase contrast enhanced scanning, the time-signal intensity curve of the region-of-interest (ROI) can be acquired. Meanwhile, the quantitative parameters reflecting tissue perfusion and vascular permeability are obtained by selecting the proper pharmacokinetic model. This method has been widely applied in many clinical aspects, including tumor diagnosis, assessment of therapeutic response and prognostic evaluation. In this paper, we conducted a systematic review focused on main factors that may influence DCE-MRI outcomes. These factors include scanning protocol, arterial input functions (AIF), the motion displacement and the pharmacokinetic models. Optimizing these main factors may improve the reproducibility and accuracy of the DCE-MRI results.]]></description>
<pubDate>Fri,20 Jan 2017 00:00:00  GMT</pubDate>
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