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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=201805</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[A preliminary study on the effects of secondary perfusion on the hemodynamics of the total quantitative brain perfusion]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.001</link>
<description><![CDATA[Objective: To investigate the effects of secondary perfusion on the hemodynamics of the total quantitative brain perfusion and obtain the optimal injection timing. Materials and Methods: The 100 volunteers who had no cerebrovascular disease were divided into five groups according to the timing of injection (3, 5, 7, 9 and 11), while taking MR conventional scanning and complete quantitative perfusion scanning. The cerebral bleeding flow (CBF) and cerebral blood volume (CBV) were calculated automatically. The time-signal strength diagram was described by the conventional perfusion weighted imaging (PWI) post-processing methods. Then we can analyze whether there was a second perfusion. The values of CBF and CBV of the subjects' interest areas (frontal lobes, thalamus and cerebellum) were measured. Results: The probability of secondary perfusion was 95% and 80% respectively in the patients with total quantitative perfusion in the 3rd and 5th injection. The probability of secondary perfusion in phase 7 and 9 was 10% and 5% respectively. The probability of the second perfusion was 0% in the 11th injection, but the timing was too late and the data was meaningless. Secondly, there was no statistically significant difference between the bilateral frontal lobes, thalamus and cerebellum in different injection period (P＞00.05). The CBV and CBF values of the frontal lobes, thalamus and cerebellum in different injection periods were measured, and the CBV and CBF values of the obvious secondary perfusion were compared with the CBV and CBF values that did not exist in the second perfusion, and the CBV and CBF values of the secondary perfusion were significantly larger. Conclusions: The best injection period of total quantitative perfusion was in period 7—9. The CBV and CBF values of the secondary perfusion were significantly higher.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[Research on changes in three core networks for amnestic mild cognitive impairment based on resting-state fMRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.002</link>
<description><![CDATA[Objective: The purpose of the present study was to identify neuroimaging biomarkers for amnestic mild cognitive impairment (aMCI). Materials and Methods: We implemented voxel-mirrored homotopic connectivity (VMHC) and Granger causality analysis (GCA) on the resting-state fMRI data of 30 patients with Alzheimer's disease (AD), 14 patients with aMCI, and 18 healthy controls (HC). Results: Using VMHC and GCA techniques, we revealed differences in connectivity of the three core networks that include the default-mode network (DMN), salience network (SN), and executive control network (ECN) among these three groups. The VMHC revealed significantly decreased connectivity in the AD group compared with the HC and aMCI groups within the triple networks, but there were no group differences between aMCI and HC subjects. The directed connectivity obtained from GCA could differentiate between the AD, aMCI and HC groups. Conclusions: These findings suggest that changes observed in triple networks can be used as a neuroimaging indicator for aMCI patients to distinguish between AD, aMCI patients and normal volunteers.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of apparent diffusion coefficient in the differentiating diagnosis between primary central nervous system lymphoma and glioblastoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.003</link>
<description><![CDATA[Objective: To investigate the value of apparent diffusion coefficient in the differentiating diagnosis between primary central nervous system lymphoma and glioblastoma. Materials and Methods: This study retrospectively analyzed 17 cases of primary central nervous system lymphoma and 24 cases of glioblastoma (WHO Ⅳ grade) confirmed by surgery and pathology. The morphological features of MRI, the enhancement, the minimum-, mean-, and maximum apparent diffusion coefficient (ADC) (ADCmin, ADCmean, ADCmax) on the two diseases and the ratio of apparent diffusion coefficient value (rADC) of lesions and normal brain parenchyma were quantitatively analyzed. Results: The mean age at PCNSL and GBM did not differ significantly [(55.3±19.1) years and (58.2±15.1) years]. The MRI features of PCNSL compared with GBM include multiple lesions (70.6% vs 4.2%, P＜0.001), significantly uniform enhancement (82.4% vs 4.2%, P＜0.001) was apparently more common; whereas GBM showed more pronounced cystic degeneration, necrosis, and hemorrhage (100% vs 47.1%, P＜0.001) compared with PCNSL. PCNSL have lower ADCmean value [(0.86 ± 0.34)× 103 mm2/s and (1.47 ± 0.57)×103 mm2/s, P=0.019) than those of GBM. The ratio ADC value of PCNSL were higher than those of GBM (1.16±0.63, 1.83 ± 0.38, P=0.020). Conclusions: This study confirms that the morphologic appearance, enhancement modalities, and their measured ADCmean values and their ratios are entirely valid for the identification of PCNSL and GBM.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[Study of consistency of three kinds of FLAIR vascular hyperintensity scoring]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.004</link>
<description><![CDATA[Objective: To evaluate the inter-observer agreement of three different FVH (FLAIR vascular hyperintensity) scoring methods. Materials and Methods: MRI images of 179 patients who were diagnosed with ischemic cerebrovascular disease during the time between June 2016 and June 2017 in Affiliated Hospital of Yangzhou University were collected. Three radiologists were invited to evaluate both sides of the MCA feeding area of each patient independently with three different FVH scoring methods. The inter-observer agreement of the scoring was examined by Kappa test and Kendall test. Results: The coincidence rates of Lee method, Olindo method, Olindo method (after grouping), Improved ASPECT method, and improved ASPECT method (after grouping) are 68.7%, 26.0%, 51.1%, 41.1% and 60.1% respectively. The average inter-observer agreement Kappa values for these methods are 0.652, 0.304, 0.530, 0.427 and 0.612 (P＜0.001), and the related value of conformance of the methods among the reviewers are 0.882, 0.924, 0.900, 0.920 and 0.909 (P＜0.001) respectively, indicated by Kendall test. Conclusions: Lee method has the best inter-observer agreement (high conformance). Olindo method and improved ASPECT method have a lower inter-observer agreement (lower and moderate conformance), but after grouping, they both get improved (moderate and high conformance). Clinic application should choose an appropriate FVH scoring method based on the evaluation purpose and the degree of differentiation.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[Clinical evaluation of cardiac magnetic resonance tissue tracking technology for coronary heart disease patients with myocardial infarction]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.005</link>
<description><![CDATA[Objective: Echocardiography and cardiac magnetic resonance can measure myocardial motion and deformation noninvasively. The purpose of this study was to investigate the clinical value of cardiac magnetic resonance tissue tracking technology (CMR-TT) in assessing left ventricular function in patients with coronary artery disease (CAD) and in correctly diagnosing myocardial infarction. Materials and Methods: Twenty three patients with coronary artery disease and 16 healthy volunteers underwent 3.0 T CMR, including CMR cine and late gadolinium enhancement. We use CVI42 software to measure heart function. The cardiac function was measured with CVI42 software and the global or segmental strain of left ventricle was analyzed using tissue tracking  technology to obtain myocardial 3D strain parameter values in all directions. The mean value of the above parameters were compared among groups, ICC analysis, Pearson correlation analysis, Logistic regression model and receiver operating characteristic analysis (ROC analysis). Results: The overall left ventricular radial strain (ICC=0.944), circumferential strain (ICC=0.988) and longitudinal strain (ICC= 0.987) showed good repeatability. The radial strain, circumferential strain and longitudinal strain in the left ventricle in the CAD group were significantly lower than those in the healthy group (30.35%±17.26% vs 45.46%±8.90%, -13.92%±5.77% vs -19.34%±2.30%, -11.30%±4.75% vs -16.54% ± 2.40%, P＜0.01). Left ventricular ejection fraction was strongly correlated with radial strain (r= 0.774, P＜0.001) and strongly correlated with circumferential strain (r=0.778, P＜0.001) and strongly correlated with longitudinal strain (r=0.802, P＜0.001). The peak values of radial strain, circumferential strain and longitudinal strain of LGE-positive myocardial segments in coronary heart disease group were lower than those in LGE-negative myocardial segments (9.95% vs 41.42%, -7.67% vs -17.2% -6.68% vs -13.83%, P＜0.01). Myocardial radial strain (AUC=0.914) and circumferential strain (AUC=0.911) have high diagnostic value in the diagnosis of myocardial infarction. When the cut-off value of myocardial radial strain was 16.83%, the diagnostic accuracy was high (Youden index=0.7399). When the circumferential strain cut-off is -11.44%, the diagnostic accuracy is high (Youden index=0.7511). Longitudinal strain with a cut-off value of -9.41%, diagnostic accuracy is low (Youden index=0.5552).When we use the radial strain and circumferential strain combined diagnosis of myocardial infarction of coronary heart disease, AUC, sensitivity and specificity than independent diagnosis of each index increased. Conclusions: Cardiac magnetic resonance tissue tracking has good feasibility and repeatability in clinical application. Radial strain, circumferential strain and longitudinal strain have a strong correlation with left ventricular ejection fraction of coronary heart disease. Radial strain and circumferential strain have higher diagnostic value in the diagnosis of myocardial infarction in coronary heart disease. When we use these two indicators combined diagnosis can improve diagnostic performance.This suggests that CMR-TT strain analysis has potential clinical value in identifying myocardial infarction segments without coronary contrast.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[Investigation of correlation between IVIM and DCE-MRI on uterine cervical carcinoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.006</link>
<description><![CDATA[Objective: This study was aimed to analyze the correlation of perfusion parameters between the IVIM and DCE-MRI models to investigate the feasibility of perfusion evaluation by IVIM on uterine cervical carcinoma (UCC), and compare the difference of those perfusion parameters between squamous cell carcinoma (SCC) and adenocarcinoma (AdC). Materials and Methods: Fifty-three patients with newly diagnosed uterine cervical carcinoma were collected in our hospital from April 2016 to June 2017 and performed MRI examination before treatment, including intravoxel incoherent motion (IVIM) and dynamic contrasted-enhanced MRI (DCE-MRI) sequence. Perfusion parameters including D*, f , and fD* (f multiple by D*) derived from IVIM, Ktrans, Kep and Ve derived from DCE-MRI were calculated, and analyzed the correlation between those two models on UCC, SCC and AdC groups respectively using Spearman’s correlation. Independent sample t test and t’ test were conducted to compare the difference of those perfusion parameters between SCC and AdC, and ROC was used to compare the area under the curve (AUC), and analyze the cut-off of the most meaningful parameter and diagnostic efficiency. Results: D* and fD* were slightly and moderately positively correlated with all the three parameters of DCE-MRI on all UCC (r: 0.357—0.672), whereas f had no correlation with parameters of DCE-MRI. D* correlated positively with Ktrans highly on AdC (r=0.900) and moderately on SCC (r=0.669). AdC had higher f, Ktrans and Kep value than SCC (P: 0.002—0.013). With the cut-off of the f value less than 0.29 to diagnosis of AdC, the sensitivity, specificity and accuracy were 63.64%, 92.86% and 86.79%, respectively. Conclusions: Positive correlations were existed between perfusion parameters by IVIM and those of DCE-MRI on UCC, suggesting that IVIM could provide information about tumor perfusion. IVIM also was helpful to identify different pathological types of UCC.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[The effect of social evaluation threats on decision-making in social dilemmas: a rs-fMRI study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.007</link>
<description><![CDATA[Objective: To study the neural basis of individual differences in the effect of social evaluation threats on decision-making in social dilemmas, we used a modified prisoner's dilemmas (PD) with resting-state functional magnetic resonance imaging (RS-fMRI) technology. Materials and Methods: Sixty healthy volunteers took part in the study and were randomly divided into a threat group and a non-threat group. Participants were asked to provide their photos, which would be evaluated by strangers. The evaluations received by the threat group were mostly negative while the evaluations received by the non-threat group were mostly positive. The experiment was divided into three blocks. In each block, participants were informed of the feedback of the social evaluations, and then completed the one-shot prisoner's dilemma with different people. They needed to choose whether to cooperate with their partners or not in the prisoner's dilemma, and their remuneration would be determined by the outcomes. Cooperation rates in the prisoner's dilemma were used to explore the effect of social evaluation threats on decision-making in social dilemma. A toolbox for data processing & analysis for brain imaging (DPABI) was used to process the RS-fMRI data. This research performed correlation analysis between cooperation rates and regional homogeneity (ReHo) as well as that between cooperation rates and amplitude of low frequency fluctuation (ALFF). Results: The total cooperation rates and the third block's cooperation rates of the threat group were negatively correlated with the ALFF values of striatum, the ReHo values and the ALFF values of orbitofrontal cortex. Conclusions: It was indicated that the activities of the orbitofrontal cortex and the striatum in the resting state were related to the cooperative behavior in social dilemma after evaluation of social threats.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[The interpretation of a consensus statement for parametric mapping techniques with cardiovascular magnetic resonance by SCMR in 2017]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.008</link>
<description><![CDATA[A consensus statement for cardiovascular magnetic resonance mapping techniques (T1, T2, T2* and extracellular volume fraction (ECV)) was released by the society for cardiovascular magnetic resonance (SCMR) in 2017. In order to provide relevant reference, in this article, we mainly interpreted this consensus statement in terms of clinical indications, practical recommendations for protocols and techniques, current state and future of clinical applications.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[Recent advances in the study and clinical application of high resolution MR intracranial vascular wall imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.010</link>
<description><![CDATA[Arterial stenosis caused by intracranial artery disease is one of the main risk factors of ischemic stroke. Its causes include atherosclerosis, arterial dissection, arteritis, moyamoya disease and so on. High resolution magnetic resonance imaging of vascular wall is the only non-invasive technology that can be used for intracranial vascular wall imaging in the present. It has the advantages of high spatial resolution, contrast noise ratio and can differentiate intracranial atherosclerosis, arterial dissection, arteritis and moyamoya disease. It provides important information and evidence for clinical diagnosis and treatment. The following is a summary of the progress in imaging technique research and clinical application of 3.0 T high resolution MR imaging of intracranial vascular wall.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[Electrophysiological and fMRI research of grid cells]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.011</link>
<description><![CDATA[Since 2005, grid cells have been found in the entorhinal cortex in varied mammals. Grid cells, as the cytological basis of spatial navigation, have hexagonally arranged firing fields and play the role of path integration. Previous studies have been limited to animal level experiments and traumatic neurophysiological experiments. While more recently, grid cells have been identified also in human brain using functional MRI. Since found that grid cells participate in abstract cognitive processes more than spatial navigation, the role of grid cells in human cognition has attracted more and more attention. The decline of spatial navigation capability is the earliest sign of Alzheimer's disease. Exploring the neural mechanisms supporting spatial navigation remains a research hotspot in neuroscience. This article reviews the electrophysiological and fMRI research of grid cells.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[The research progress of neuroimaging studies in patients with type 2 diabetes cognitive impairment]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.012</link>
<description><![CDATA[More than half of patients with type 2 diabetes mellitus have mild or moderate cognitive impairment, and in character with attention and memory, information processing speed and execution dysfunction and so on. In recent years, in addition to the pathophysiological studies T2DM induced mechanism of cognitive dysfunction, all kinds of new technology of MRI for revealing the structure of diabetes patient's brain and the alteration of brain function have important value, such as susceptibility weighted imaging (SWI), diffusion tensor imaging (DTI), resting-state functional magnetic resonance imaging (rs-fMRI), magnetic resonance spectroscopy (MRS), etc, play an important role in revealing the changes of brain structure and function in diabetes. In this article, we present a review focusing on neurological imaging of brain structure and function changes in patients with T2DM.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[Progress of preoperative and intraoperative MR functional imaging in glioma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.013</link>
<description><![CDATA[Brain glioma is the most common primary brain tumor, originated from glial cells and characterized by local invasive growth. MR is the main imaging method for diagnosis of glioma. With the development of MR Spectroscopy (MRS), diffusion tensor imaging (DTI) and blood oxygen level-dependent functional magnetic resonance imaging (BOLD-fMRI). It could reduce postoperative injury and improve the prognosis for gliomas which surgery was the main treatment by personalized preoperative planning and intraoperative monitoring. In this paper, the use of normal MRI and functional MR including MRS, DTI and BOLD-fMRI in preoperative planning and intraoperative monitoring of glioma was reviewed.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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<title><![CDATA[Progress of multimodality MRI study on brain of end stage renal disease]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.05.014</link>
<description><![CDATA[End stage renal disease has many neurological complications, which seriously affect the patient's quality of life and increase the mortality. In recent years, many noninvasive MRI techniques have been used in the study of occult brain damage in patients with ESRD, and proving up the underlying pathophysiological mechanisms. The recent research progresses of advanced MRI techniques in ESRD were reviewed in this article.]]></description>
<pubDate>Sun,20 May 2018 00:00:00  GMT</pubDate>
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