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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=201708</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[The TOAST classification and imaging characteristics in acute cerebral infarction with different treatment methods]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.001</link>
<description><![CDATA[Objective: To analyze the imaging features of acute cerebral infarction with different therapies using multi-mode magnetic resonance diffusion weighted imaging-perfusion weighted imaging. Materials and Methods: One hundred and ten patients admitted to our hospital neurology department with acute cerebral infarction were retrospectively analyzed. All patients were performed multi-mode magnetic resonance examination, the imaging findings, clinical data and laboratory findings were recorded. The diffusion weighted imaging (DWI) and trial of org 10172 in acute stroke treatment (TOAST) of patients were classified according to them. The patients were divided into vein thrombolysis group (43 cases), artery bolt group (34 cases) and conservative treatment group (33 cases), and the imaging and clinical data of three groups were statistically analyzed. Results: (1) The ratio of ischemic penumbra and hyperintense vessel in artery bolt group were higher than the ratio of vein thrombolysis and conservative treatment group, and the difference had statistical significance (F=13.713, P=0.001; F=8.108, P=0.017). (2) In terms of DWI classification, the small penetrating branch infarction and unilateral anterior circulation infarction for lager ratio in vein thrombolysis group (25.58%, 23.26%), unilateral anterior circulation infarction and anterior-posterior circulation infarction for larger ratio in artery bolt group (52.94%, 21.43%) and conservative treatment group (30.30%, 30.30%). (3) In terms of TOAST classification, LAA for larger ratio in vein thrombolysis group (39.53%), UND for lager ratio in artery bolt group, SAO for conservative treatment group. (4) In terms of MRA imaging findings, both middle cerebral artery and internal carotid artery showed the highest proportion of normal in intravenous thrombolysis and conservative treatment group (72.09%, 51.52%), and middle cerebral artery stenosis or occlusion showed the highest proportion in artery bolt group (41.18%). (5) Artery bolt group had the highest bleeding conversion rate in the three groups (26.47%), the difference was statistically significant (F=6.462, P=0.040). (6) Hospital NIHSS score and hyperlipidemia in the three groups had statistical difference (t=6.209, P=0.003; F=6.176, P=0.046). (7) the onset time in conservative treatment group (6.55±4.70) was longer than that in intravenous thrombolysis group (2.93±1.05) and artery bolt group (3.07±2.51). There were significant differences in three groups (t=16.246, P=0.000). Conclusion: Knowledge of the imaging findings of patients with different treatment characteristics, can help clinical doctors choose reasonable treatment scheme according to the concrete situation, realize the personalized treatment.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Wall characteristics of symptomatic middle cerebral artery stenosis: high-resolution MRI study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.002</link>
<description><![CDATA[Objective: To evaluate the wall features of symptomatic atherosclerotic middle cerebral artery stenosis by using HRMRI. Materials and Methods: One hundred and twenty-seven cases clinical data and image data about symptomatic atherosclerotic middle cerebral artery stenosis were analyzed. According to the DWI sequence, 127 cases were divided into symptomatic and asymptomatic group. Clinical data and wall features were compared between two groups (location,  morphology,  signal).  Results: There was significantly difference between two groups in diabetes (χ2=23.446, P＜0.001), male was more in symptomatic group than asymptomatic group (χ2=5.104, P=0.024), there was no significantly difference in two groups in age, hypertension, hyperlipidemia, smoke and drink (P＞0.05). One hundred and ten plaques in 127 cases, ventral plaque was the most. Superior plaque was more in symptomatic group than asymptomatic group (χ2=4.257, P=0.039), irregular surface was significant difference in two groups (χ2=8.087, P=0.004), hyper-intensity was obvious difference in two groups (χ2=5.396, P=0.020). Conclusion: HRMRI could evaluate the wall features of atherosclerotic middle cerebral artery.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Cardiac magnetic resonance T1 mapping manifestation of one patient with immunoglobin light-chain cardiac amyloidosis and literature review]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.003</link>
<description><![CDATA[Objective: To discuss magnetic resonance T1 mapping of cardiac amyloidosis and its clinical features in order to achieve better understanding of this disease. Materials and Methods: A case from Beijing Hospital diagnosed with cardiac amyloidosis admitted was reported and the related literature was reviewed.  Results: A 72 year-old man presented with chronic cardiac dysfunction, relapsing heart failure, poor self-care ability, paroxysmal nocturnal dyspnea and NYHA Grade III. Cardiac ultrasonography came to a diagnosis of non-obstructive hypertrophic cardiomyopathy. The patient was admitted to Beijing Hospital due to aggravating heart failure with left atrial thrombosis, pulmonary edema and bilateral plural effusion. Cardiac magnetic resonance (CMR) imaging revealed asymmetric hypertrophy in myocardium with ventricular interval predominant, and that left ventricular myocardial motion became weak with rapid chambers’ washout, dark blood pool in the chamber and diffused subendocardium enhancement in late gadolinium enhancement. T1 mapping was showing prolonged longitudinal relaxation time of myocardium and increased extracellular volume fraction. Biopsy of corpora linguae revealed thickened submucosal vessel wall and accumulation of homogeneous stained-pink amorphous substance with congo red positive combined with polarized light apple-green appearance on microscopy. The finding was consistent with cardiac amyloidosis. Conclusion: Cardiac amyloidosis usually manifests myocardial hypotrophy and left ventricular systolic dysfunction. CMR and the related advanced imaging techniques play an important role in diagnosis of cardiac amyloidosis.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Cardiac magnetic resonance imaging as a diagnostic tool in viral myocarditis with the main symptoms of acute coronary syndrome]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.004</link>
<description><![CDATA[Objective: To evaluate the value of cardiac magnetic resonance imaging in the diagnosis of viral myocarditis with the main symptoms of acute coronary syndrome. Materials and Methods: Sixteen cases of highly suspected acute viral myocarditis with negative coronary angiography and five cases of ischemic heart disease as the control were included into this study from January of 2013 to December of 2016 in the department of cardiology, Chongqing Qianjiang central hospital; all the selected patients underwent electrocardiogram-gated magnetic resonance imaging with the scan sequences including T2 weighted imaging (T2WI), turbo FLASH sequence, early gadolinium enhanced (EGE) ratio and late gadolinium enhanced (LGE) sequence, and the data of above sequences were collected and statistically analysed. Results: The scores of T2WI, LGE and overall Lake Louise Criteria significantly increased in viral myocarditis with the main symptoms of acute coronary syndrome comparing to the control by using cardiac magnetic resonance (P=0.021, 0.011, 0.002); receiver operating characteristic curves showed that the best cut-off value of Lake Lewis Criteria score was 6.12, the sensitivity was 93.8%, specificity was 80%; comparing with Turbo FLASH sequence, EGE ratio, LGE, and T2WI, diagnostic efficacy of Lake Lewis Criteria score was balanced; the specificity of LGE was 100%, and the sensitivity of T2WI was 93.8%. Conclusion: Lake Lewis criteria may be an effective and non-invasive tool for the diagnosis of viral myocarditis with the main symptoms of acute coronary syndrom; and MRI-LGE sequence with good specificity and MRI-T2WI sequence with good sensitivity could be used for the differential diagnosis of ischemic heart disease.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparison of rectal signet ring cell carcinoma and adenocarcinoma: magnetic resonance imaging features of rectal signet ring cell carcinoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.005</link>
<description><![CDATA[Objective: To investigate the magnetic resonance (MR) characteristics of primary rectal signet ring cell carcinoma (SRCC), compared with conventional rectal adenocarcinoma (AC). Materials and Methods: 28 cases of rectal SRCC and 31 cases of AC confirmed by pathology with primary rectal MR data were retrospectively analyzed. Compare SRCC with AC about the TNM stage, the basic imaging characteristics and tumor signal from T2WI sequence. Results: In 28 cases of rectal SRCC, the average tumor diameter was 49.33 mm, which exceeded the average 4.03 mm of the rectal intrinsic muscle layer, and the average distance from the lower margin of the tumor to the anal edge was 58.44 mm. The distant metastasis rate of SRCC was 25% (7/28), and the rate of the peritoneal metastasis was 10.7% (3/28). The ratio of the circumferential infiltration more than half of SRCC was higher than AC (92.9% vs 61.3%, P=0.004). The tumor/fat, tumor/muscle and tumor/urine signal ratios of SRCC from T2WI sequence were higher than that of AC respectively. There were no significant differences in the transverse maximum thickness, longitudinal diameter, and the distance of the lower edge of the tumor from anal edge between SRCC and AC. In terms of the distance of tumor breakthrough from the intrinsic muscle layer of the rectum, AC was higher than SRCC (6.03 mm vs 4.03 mm, P=0.044). Conclusion: The rectum circumferential invasion range of SRCC was larger than rectal conventional adenocarcinoma, but the breakthrough of muscular layer distance was relatively limited. The MR T2WI signal of rectal SRCC was often higher than that of conventional adenocarcinoma, which may provide a certain prediction in the differential diagnosis of rectal adenocarcinoma for multidisciplinary therapy.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Study of MR diffusion tensor imaging characteristics of uterine fibroids with different signal intensity on T2WI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.006</link>
<description><![CDATA[Objective: To study different DTI characteristics among uterine fibroids with different T2 signals. Materials and Methods: Clinical cases were collected from April 2014 to January 2015, including 116 patients with 141 uterine fibroids, grouped by T2WI signal intensity as below: hypointense group (57), isointense group (33) and hyperintense group (51). All the patients underwent routine MR plain scan, enhanced scan and DTI examination. Compared all DTI characteristics from each group, test and analyzed the MD value, FA value and RA value with the SPSS 19.0 software. Results: The MD value of hypointense group was significantly lower than that of isointense group and hyperintense group (P=0.000, 0.000), while the MD value of isointense fibroids group was significantly lower than hyperintense group (P=0.000). To compare the FA and RA value between three groups, the hypointense group is significantly higher than isointense and hyperintense group (P=0.000, 0.000), and the isointense group is higher than hyperintense group (P=0.000). RA value of each group had the similar changing trend with the FA value, and lower than FA value, such as the hypointense group is higher than isointense and hyperintense group (P=0.000, 0.000), and the isointense group is higher than hyperintense group (P=0.000), there were significant difference in three groups. Conclusion: Uterine fibroids with different T2 signals intensity have different characteristics in DTI imaging, and DTI parameters can be reflected in the different organizational structure of fibroids.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[MRI in the diagnosis of placenta accreta]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.007</link>
<description><![CDATA[Objective: To analyze the features and diagnostic value of MRI in placenta implantation abnormality (PIA). Materials and Methods: Sixty-five cases placenta previa underwent MRI scans, compare with comfirmed clinically or pathologically, obtained the sensitivity, accuracy and analyze the MRI appearances. Results: Placenta accreta was found in 12 cases, placenta increta in 18 cases. The direct signs of PIA were as follows: the bottom of decidual low signal being blurred or interrupt, myometrium becoming thinner or interrupted. The indirect signs of PIA were as follows: lower uterine segment bulging, local thickening and heterogeneous signals of placenta, the intraplacenta vascularity becoming thickening and increasing. The sensitivity, specificity, positive predictive value, negative predictive value were 90.9%, 89.7%, 88.2%, 92.1%. Conclusion: MRI has a high diagnostic value for PIA, and it can guide the clinical to maka effective treatment and reduce the complications.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[he effect of economic status on responses to unfairness: A rs-fMRI study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.008</link>
<description><![CDATA[Objective: The present resting-state functional magnetic resonance imaging (fMRI) study aimed at investigating how functional connectivity predicted the modulation of economic status on responders’ unfairness-related social decision making in a modified ultimatum game (UG). Materials and Methods: Thirty healthy volunteers engaged in the study. During the UG task, participants would be informed of the economic status of proposers (High or Low) before receiving offers from proposers, and they would decide whether to accept the offers or not. Rejection rates and fairness ratings were used to explore the effect of proposers’economic status on responses to unfairness. Data processing assistant for resting-state fMRI (DPARSF) toolbox was used to process the rs-fMRI data and calculate the functional connection values (FC) between right dorsolateral prefrontal cortex (DLPFC)/right thalamus and other voxels in the brain. Then correlation analysis was conducted to examine the relationship between FC values and rejection rates or fairness ratings. Results: When unfair offers were given by proposers in high economic status, rejection rates were negatively correlated with FC between right DLPFC and right medial prefrontal cortex (MPFC)(r=-0.80, P＜0.01), and fairness ratings were negatively correlated with FC between right thalamus and left MPFC (r=-0.59, P＜0.01). Conclusion: It was indicated that FC between DLPFC, thalamus and MPFC engaged in the modulation of economic status on unfairness-related social decision making.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Preparation of folate-mediated superparamagnetic iron oxide-dopamine-folate and its in vitro MR imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.009</link>
<description><![CDATA[Objective: To observe the targeting function of folate-conjugated superparamagnetic iron oxide-dopamine (NP-DA-Dextra-FA) to Bel7402 cells by folate receptor (FR) and the possibility for monitoring tumor targeting with MRI. Materials and Methods: NP-DA-Dextra-FA and NP-DA-Dextran were hatched with Bel7402 cells for 2 h, separately. Prussian blue staining was used to survey intracellular irons, meanwhile MRI was used to research the signal intensity of cells. The competitive inhibition test was performed. Results: The experimental group showed the T2WI signal intensity of Bel7402 cells declined significantly with the rise of NP-DA-Dextra-FA’s iron concentration. A lot of intracellular irons were observed in Bel7402 cells. The control group showed the signal intensity of Bel7402 cells on T2WI decreased less clearly. Some intracellular irons were showed in Bel7402 cells. The competitive inhibition test showed the T2WI signal intensity increased with the folic acid concentration rising. Conclusion: In vitro, the NP-DA-Dextra-FA has obvious targeting ability to Bel7402 cells. The cell targeting processes could be supervised with MRI.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Field map-based rectification of susceptibility distortion and signal compensation in diffusion tensor imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.010</link>
<description><![CDATA[Objective: This study was designed to employ the voxel-based field map to rectify the geometric deformation and compensate the signal loss of diffusion tensor imaging (DTI), and thus facilitate the studies and clinical applications of DTI. Materials and Methods: Brain field maps from 29 healthy persons were first used to get B1 field heterogeneous signals, and then the compensation and phase disconsolation of signals were performed. Finally, the geometry deformations of DTI were rectified and registered to 3D images. Magnetic sensitive bilateral temporal lobes and frontal lobes were selected as regions of interesting and meanwhile, magnetic insensitive thalamus was selected as control area. Results: Geometry deformations of DTI produced by different susceptibilities between specific tissues were completely rectified, and thus the signal loss was compensated and the accuracy of DTI was significantly enhanced. Conclusion: Signal compensations and deformation rectifications can be well achieved using field map, which may improve the applications of DTI in neurosurgery.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Application and sequence optimization of  MRI subtraction in showing trigeminal nerve and blood vessels]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.011</link>
<description><![CDATA[Objective: To explore the application and sequence optimization of MR silhouette in the display of relation between trigeminal nerve of intracisternal segment and surrounding blood vessels. Materials and Methods: From January 2015 to July 2016, 84 patients with suspected trigeminal neuralgia from people’s hospital of Deyang city were treated with 3T MRI for 3D-TOF-MRA, 3D-B-FFE and CE-MRA. And then silhouette: the image of CE-MRA minus that of 3D-B-FFE multiplied by the 100%, 40%, 10% coefficient (silhouette method) to obtain the images of group A, B, C after silhouetting, and 3D-TOF-MRA minus 3D-B-FFE multiplied by the image of 40% coefficient to obtain the image of group D. Calculation was done to obtain the singal to noise ratio (SNR) of trigeminal nerve, contrast to noise ratio (CNR) and singal intensity ratio (SIR) of arteries and veins versus trigeminal nerve in the images of group A, B, C and D. The 3D-TOF-MRA combined with 3D-B-FFE and group B of silhouette method were analyzed and compared to determine the affected nerve’s contacting with blood vessels. Results: Groups A, B, C were compared, where SNR of trigeminal nerve, CNR of arteries and veins versus trigeminal nerve, and SIR of veins versus trigeminal nerve all had statistical significance (P＜0.05), and SIR of arteries and trigeminal nerve had no statistical significance (P＞0.05). Groups B, D were compared, where SNR of trigeminal nerve, and CNR and SIR of arteries versus trigeminal nerve had no statistical significance (P＞0.05), while CNR and SIR of veins versus trigeminal nerve had statistical significance (P＜0.05). In determining the relation between blood vessel and nerve by 3D-TOF-MRA combined with 3D-B-FFE and group B of silhouette method, there was no significant difference in the positive rate of two methods (P＞0.05). In the patients diagnosed as positive by both two methods, compressional deformation rate of group B image was greater than that of 3D-TOF-MRA combined with 3D-B-FFE (P＜0.05). Conclusion: Silhouette of CE-MRA and 3D-B-FFE multiplied by 40% coefficients make the cerebrospinal fluid low signal, the nerve equal signal, and arteriovenous vessel high signal, which has a strong ability to display the space relation between trigeminal nerve of intracisternal segment and surrounding blood vessel.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The diagnosis of lastonfibroma on dorsi by multi-slice computed tomography and magnetic resonance imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.012</link>
<description><![CDATA[Objective: This study was to investigate multi-slice spiral computed tomography (MSCT) and magnetic resonance imaging (MRI) appearances of elastofibroma dorsi (EFD). Materials and Methods: 20 cases of elastofibroma dorsi which were confirmed by pathology after surgical resection were retrospectively reviewed. All patients were examined with CT, 8 of them underwent CT enhancement examination, 4 of 20 patients were examined with MRI, and 1 patient underwent MRI enhancement examination, and other 3 without enhancement. The CT values of EFD, anterior serratus muscle and surrounding fat were measured by CT and compared with that of the other groups respectively. Clinical manifestations, features of CT and MRI of elatofibroma dorsi were analyzed. Results: It was bilateral in 13 patients of 20 patients, right lateral in 4 patients and 3 patients occurred in left lateral. 33 lesions were found by MSCT, all of them were located in the deep subscapular region, presented as flat hummocky and semicircular soft-tissue mass, all tumours had almost equal density as muscle, with some Strap-shaped fat-liked density along the longitudinal of the mass. The mass was poorly circumscribed, surrounded by ambiguous adipose space. On enhanced CT scan, 3 lesions showed slight enhancement, others didn’t show any extent of enhancement, there was statistical difference of CT values between EFD and anterior serratus muscle, while the same result of EFD and fat (P＜0.05). On MRI plain scan, the tumour showed heterogeneous signals of iso-intensity of muscle and hyper-intensity of fat. As to the case with enhanced MRI scan, moderately heterogeneous enhancement was observed. Conclusion: Elastofibroma dorsi has its specific location, definite diagnosis could be made according to the features of MSCT and MRI imagings.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The methods and quality control of fMRI research on mechanism of heroin addiction]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.013</link>
<description><![CDATA[Heroin addiction is a chronic recurrent functional disease of brain, and its mechanism is not clear. Functional magnetic resonance imaging (fMRI) plays an increasingly important role in revealing the mechanism of heroin addiction. Based on long-term research practice of the author's team, this paper focused on fMRI methods and quality control related with the study on mechanism of heroin addiction. We hope to provide some reference for people who plan to carry out fMRI studies on the mechanism of heroin addiction.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Cognitive impairment in type 2 diabetes mellitus and its resting-state functional MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.014</link>
<description><![CDATA[Diabetic cognitive impairment is a common complication of diabetes in the central nervous system. Resting-state functional MRI (rs-fMRI) based on blood oxygen level dependent imaging was divided into two categories: functional separation and functional integration. With the development of new technology of functional magnetic resonance imaging, the early detection of diabetic cognitive impairment becomes possible, especially the rs-fMRI with advantages of non-invasion, non-ionizing radiation and higher spatial resolution has gradually become an effective tool to study the physiological mechanisms of cognitive impairment. In our country, the type 2 diabetes mellitus accounts for more than 90% of diabetes mellitus, which has become a research hotspot. This paper briefly reviews the cognitive impairment in type 2 diabetes mellitus and its resting-state functional MRI.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Progress of blood oxygen level-dependent (BOLD) MRI in the kidney]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.08.015</link>
<description><![CDATA[Kidney operates an important organ remaining the homeostasis, the water-electrolyte balance, and discharging the metabolites in vivo, while the oxygenantion plays a key role in renal function and disorders. Blood oxygen level-dependent magnetic resonance imaging (BOLD MRI) is a non-invasive functional technology to evaluate the renal oxygen, which can not only display the morphological structure imaging, but also investigate the metabolism, the function, and the molecular level of the kidneys, up to now, it has been made great progresses in the diagnosis, the differentiation, and the therapeutic response of nephropathy. This article will review the clinical progresses with BOLD MRI of the kidneys in the past few years.]]></description>
<pubDate>Sun,20 Aug 2017 00:00:00  GMT</pubDate>
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