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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=201610</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[Evaluation of the morphological characteristics and infarction pattern of unilateral middle cerebral artery occlusion using high resolution magnetic resonance  imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.001</link>
<description><![CDATA[Objective: To evaluate the two different morphological characteristics  and  corresponding infarction pattern of unilateral middle cerebral artery occlusion  using  high  resolution magnetic resonance imaging (HR-MRI). Materials and Methods: The data of patients with ischemic stroke in hospital diagnosed as unilateral middle cerebral artery M1 segment occlusion was retrospectively analyzed. HR-MRI and DWI were performed  in all patients within 1 week of symptom onset. To observe the morphological characteristics of occlusion of the middle cerebral artery (M1) segment and the cerebral infarction type on the cranial DWI. The patients were divided into plaque formation group and non plaque formation group according to the morphological characteristics of HR-MRI. DWI lesion patterns were classified as single cerebral infarction, multiple cerebral infarction, and no cerebral infarction (TIA). Results: Forty-four patients were included in the analysis, 30 cases of plaque formation group, while 14 cases of non plaque formation group. There were 16 cases in plaque formation group with the location of occlusion in the proximal of M1 segment, 14 cases in the distal and non plaque formation group in the proximal 13 cases, while 1 case in the distal, there was significant difference between the two groups (P=0.025, χ2=4.99), the location of occlusion of plaque formation group was mostly in the proximal. Plaque formation group and non plaque formation group of single cerebral infarction in 11 cases and 5 cases respectively, multiple infarction in 15 cases and 2 cases, no infarction lesion in 4 cases and 7 cases, there were significant differences in the types of cerebral infarction between the two groups (P=0.016, χ2=8.29). Infarction pattern in plaque formation was mostly multiple cerebral infarction, but the non plaque group was single cerebral infarction or no cerebral infarction (TIA). Conclusion: HR-MRI has important value in evaluating the morphological characteristics of the lumen of middle cerebral artery occlusion. Whether there is plaque in the lumen of the occlusion or collateral formation around the trunk may be one of the important reasons  for different types of cerebral infarction after middle cerebral artery occlusion．]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Degree centrality in the human functional connectome of basal ganlia stroke patients]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.002</link>
<description><![CDATA[Objective: Using degree centrality (DC), a gragh theory analysis method to construct and analyze the human functional connectome of basal ganglia stroke patients. Materials and Methods:  The resting-state fMRI data of 10 left basal ganglia stroke patients under subacute stage, chronic phase and 10 normal controls were taken, for each scan of every subject, construct the human functional connectome and calculate the DC value, the distribution maps of high DC value nodes were extracted for each group, the intergroup differences were analyzed. Results: The high DC map of the normal control distributed symmetrically, in precuneus/posterior cingulate of the posterior cerebral midline, bilateral basal ganglia and thalamus, the patients' maps distributed in disorder. Compared with normal controls, under subacute stage, DC increased in ipsilateral contralateral default-mode network (DMN), decreased in anterior posterior DMN, under chronic phase, DC increased in vermis, contralateral precuneus/posterior cingulate. Compared between two period of patients, increased DC were found in ipsilateral precentral gyrus, superior temporal gyrus and supramarginal under subacute stage, in vermis, contralateral cerebellum hemisphere and ipsilateral precuneus under chronic phase. Conclusion: At the voxel level, DC can provide valuable information of the abnormal brain functional connectome in basal ganglia stroke patients.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[The comparative study of ischemic stroke early DKI, DWI lesions predicted the final transition]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.003</link>
<description><![CDATA[Objective: Diffusion kurtosis imaging (DKI) has lately been postulated as a complementary MRI method to stratify the heterogeneous damaged DWI lesion. Compare the ability of DWI and DKI predicting lesion transformation, to supplement the precise definition of infarct core area. Materials and Methods: Eighteen cases of ischemic stroke were recruited for our study, who had infarct on DWI at baseline, and had follow-up MR scans. Pre-defined target imaging time points, obtained on a 3.0 T MR scanner, were＜48 h and≥30 d post-stroke. Drawing the range of lesion from acute DKI (MK mapping), DWI and final T2WI, and calculate the lesion volume. Relationship between baseline DWI, MK map and follow-up T2WI was analyzed using Spearman rank-order correlation test, and Kruskal-Wallis H test was used to compare the volumes among three groups. Results: There was no difference among the volume of DWI, MK map and follow-up T2WI (H=5.819, P＞0.05). Follow-up T2WI infarct volume (766.3±1406.4) mm3 was correlated with both volume predicted with the MK map (905.8±1605.4) mm3 and baseline DWI volume (1642.5±3296.9) mm3, which showed baseline DKI (MK mapping) infarct volume had stronger correlation with final T2 infarct volume than DWI (r=0.977, P＜0.001; r=0.548, P＜0.05, respectively). Conclusion: Final infarct volume was closer to the lesion shown on DKI than on DWI, DKI can predict the final transition more accuratly.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[The study of carotid plaque characteristic of the low risk and high risk of acute ischemic stroke based on essen stroke risk score system]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.004</link>
<description><![CDATA[Objective: To investigate the difference of carotid plaque burden and plaque composition between the low risk and high risk of acute ischemic stroke (AIS) patients based on essen stroke risk score (ESRS). Materials and Methods:  Forty-one patients with AIS proved by clinic and follow-up, including low risk AIS (n=25) and high risk AIS (n=16), were enrolled in this retrospective and ethics committee-approved study. Carotid plaque high-resolution MR imaging was performed in all patients, and the responsible carotid arteries were quantitatively and qualitatively analyzed. The carotid plaque burden and compositional features were compared between the low and high risk stroke patients. Results: (1) The prevalence of recurrent AIS, age, diabetes mellitus smoking and peripheral arterial disease in patients with high risk AIS were significantly greater than patients with low risk (all P＜0.05). (2) There existed statistical difference between low and high risk AIS patients in normalized wall index (NWI), lumen diameter (LD), wall thickness (WT) and stenosis (all P＜0.05). (3) Patients with high risk AIS had a significantly higher prevalence of fibrous cap rupture (FCR), intra-plaque hemorrhage (IPH) compared, lipid rich necrotic core (LRNC) and lumen stenosis ＞50% with those with low risk AIS (both P＜0.05). The LRNC area, LRNC index, IPH area and IPH index in high risk AIS patients was statistically higher than that in low (all P＜0.05).  Conclusion: There existed some differences between low risk and high risk AIS patients, and ESRS combined with carotid plaque high-resolution MR imaging will be helpful for the stratification study for AIS patients．]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Study of relevant parameters of diffusion tensor imaging in the hippocampus of normal middle-aged group]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.005</link>
<description><![CDATA[Objective: To discuss the change of the brain metabolites on the bilateral hippocampus of different age groups and different parts in normal Chinese middle-aged group by using Diffusion Tensor Imaging (DTI), to provide the reference for early clinical diagnosis and treatment of hippocampal-related diseases. Materials and Methods: From community healthy volunteers, we selected 276 according to the standards, who were divided into three groups according to age, A group: prime period, 41 to 48 years, 90 cases; B group: steady period, 49 to 55 years, 93 cases; C group: adjustment period, 56 to 65 years, 93 cases. All subjects underwent routine conventional MRI and bilateral hippocampal DTI examination. The parameters ADC, FA values were measured. To analyse the differences of the parameters between different genders, sides, groups and parts, and discuss the correlation between parameters and age. Results: There was no statistically significant difference of ADC and FA values of the hippocampus between different sides and genders (P＞0.05). The values had statistically significant difference among groups (P＜0.05). The ADC value in group A and B was lower than group C (P＜0.05), the FA value in group A and B was higher than group C (P＜0.05), the FA value had statistically significant difference in the different parts of hippocampal (P＜0.05), the FA value in A, B and C group on hippocampal head was higher than on body and tail. The FA values were negatively correlated with age (r=-0.813, P＜0.05), the ADC values were positively correlated with age (r=0.113, P＜0.05). Conclusion: DTI can help to understand the changes of microenvironment of the hippocampal in normal Chinese middle-aged people, to provide clinical basis for early diagnosis and treatment of the diseases associated with hippocampus.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Chordoid glioma in the third ventricle: image findings and differential diagnosis: a report of three cases and review of the literature]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.006</link>
<description><![CDATA[Objective: To summarize the CT and MRI findings and differential diagnosis of chordoid glioma in the third ventricle and to explore the diagnostic value of imaging examination. Materials and Methods:  Three patients (two males and one females; range, 7-34 years) with chordoid glioma in the third ventricle confirmed by biopsy pathology were enrolled. The symptoms, imaging findings and pathology were retrospectively analyzed, and then a review of the literature was performed. Results: The symptoms were usually obstructive hydrocephalus, progressive headache, neuroendocrine symptoms. All the three tumors located in the third ventricle. The tumor usually represented as a large, well-circumscribed ovoid and hypodense lesion on CT. No cystic or necrotic changes were found. Only one case had peripheral calcification, as hyperdense on CT. On MRI, the lesions all showed homogeneous hypointensity on T1-weighted image and hyperintensity on T2-weighted image. Two cases showed heterogenously enhancement, while the other one showed homogeneously enhancement. Microscopically, the tumor cells arranged in clusters or scattered in a mucinous background. Tumor cell nucleus were round, oval or offset, chromatin were granulated or nubby, the nuclei were small and hyperchromatic, nuclear fission were rare. Necrosis was not identified, new blood vessels showed proliferation. Immunohistochemically, tumor cells were stained positively for GFAP and vimentin. Conclusion: There are several characteristic CT and MRI findings of chordoid glioma in the third ventricle. The diagnosis can be made when combining image findings with clinical findings. The final diagnosis should be confirmed by histopathology and immunohistochemical staining．]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[High-resolution magnetic resonance imaging of basilar artery with iterative decomposition of water and fat with echo asymmetric and least-squares estimation (IDEAL): A feasibility study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.007</link>
<description><![CDATA[Objective: To evaluate the potential for high-resolution MR imaging using IDEAL FSE-T2WI compared with FSE-T2WI in the assessment of the basilar artery wall. Materials and Methods: High-resolution FSE (A/P), FSE (R/L) and IDEAL FSE (A/P) T2W images were acquired from basilar artery of 30 patients using 3.0 T MRI scanner. Imaging studies were evaluated for total image quality and graded using a 4-point Likert Scale (1, nondiagnostic; 4, outstanding). Results: The total scores for FSE-T2WI (A/P), FSE-T2WI (R/L) and IDEAL FSE-T2WI (A/P) images, respectively, were as follows: 81, 92 and 115. FSE-T2WI (A/P) and FSE-T2WI (R/L) difference with statistical significance (Z=-3.317, P=0.001). FSE-T2WI (R/L) and IDEAL FSE-T2WI (A/P) difference with statistical significance (Z=-4.600, P=0.000). FSE-T2WI (A/P) and IDEAL FSE-T2WI (A/P) difference with statistical significance (Z=-4.540, P=0.000) . IDEAL FSE-T2WI images showed improved image quality compared to FSE-T2WI technique at 3.0 T. Conclusion: IDEAL FSE-T2WI is a feasible technique in the basilar artery for producing high-resolution T2-weighted imaging.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of 3.0 T MR-SWI in diagnosis of diffuse axonal injury with non-lesional CT findings]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.008</link>
<description><![CDATA[Objective: To investigate the advantages of 3.0 T MR susceptibility weighted imaging (SWI) in diagnosis of diffuse axonal injury (DAI) with non-lesional CT findings.  Materials and Methods: Twenty-three patients sufferred from brain trauma with non lesional CT findings were highly suspected DAI, and these patients were underwent 3.0 T MR exmination in 3 days after brain trauma, included T1WI, T2WI, FLAIR and SWI sequences. The sensitivity and lesional numbers of theses sequences in detecting lesions were compared, in additon, the relation of lesion numbers in SWI with GCS scores were studied. Results: The lesions concentrated in brain gray matter border zone and deep white matter. Detection rates of TlWI, T2WI, FLAIR and SWI were 23.8％, 32.2％, 46.5％ and 83.8%, respectively. Additionally, the number of lesions detected was 31, 68, 103 and 326 respectively on TlWI, T2WI, FLAIR and SWI sequences. The number of lesions detected by SWI was statistical more than conventional sequence (P<0.01)．The number of lesions in SWI was negatively correlated markedly with GCS (r=-0.876).  Conclusion: SWI can be more completely to display hemorrhagic lesions associated with DAI and be better estimated the condition of patients．]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Imaging features of hepatic hilar cholangiocarcinoma accompanied with bile duct stones]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.009</link>
<description><![CDATA[Objective: To investigate the CT and MRI features of hepatic hilar cholangiocarcinoma with simultaneous bile duct stones. Materials and Methods: Fifty-four patients with hilar cholangiocarcinoma confirmed by surgical or biopsy pathology were enrolled. Thirty-four males and twenty females with ages between 28 and 86 years old (median age 61 years old), All patients were divided into two groups according to the presence of absence of bile duct stones as detected by MRI or CT. Among 54 patients with hilar cholangiocarcinoma, eleven patients had bile duct stones (group A), the remaining 43 cases had no bile duct stones (group B). Tumor shape, Bismuth-Corlette type, atrophy of liver lobe and postoperative recurrence were retrospectively analyzed and compared between the two groups. Results: For tumor shape, infiltrative type was found in 3 patients (27.3%) vs. 32 patients (74.4%), mass type in 5 patients (45.4%) vs. 8 patients (18.6%), polypoid type in 3 patients (27.3%) vs. 3 patients (7.0%) respectively in group A and group B. Significant difference was found in tumor shape between the two groups (P＜0.05). As for Bismuth-Corlette type, there were 2 cases (18.2%) of type I, 1 case (9.1%) of type II, 4 cases (36.3%) of type IIIa, 2 cases (18.2%) of type IIIb, 2 cases (18.2%) of type IV in group A; and 3 cases (7.0%) of type I, 14 cases (32.6%) of type II, 6 cases (14.0%) of type IIIa, 10 cases (23.2%) of type IIIb, 10 cases (23.2%) of type IV in group B. No significant difference was found in Bismuth-Corlette type between the two groups (P＞0.05). There were 2 recurrent cases (18.2%) in group A while 8 recurrent cases (18.6%) in group B. There were 4 cases (36.3%) with liver lobe atrophy in group A and 15 cases (34.9%) with liver lobe atrophy in group B. No significant differences were found in postoperative recurrence and liver lobe atrophy between the two groups (P＞0.05). Conclusion: Hepatic hilar cholangiocarcinomas accompanied with bile duct stones most often manifest as mass type or polypoid type. Hepatic hilar cholangiocarcinomas accompanied with bile duct stones or not represent similarly in respect of Bismuth-Corlette type, postoperative recurrence and liver lobe atrophy.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Study on spectral clustering of amygdala using resting state functional connectivity]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.010</link>
<description><![CDATA[Objective: According to the similarity of the functional connectivity pattern of the whole brain, the feasibility of using spectral clustering to segment the brain regions of the amygdala was studied. Materials and Methods: By resting state functional imaging according to the functional connectivity pattern of each voxel in a specific brain region, spectral clustering was performed to segment the amygdala region. Results: The segmentation results of subregion on the right side of the central medial nucleus (CM) were similar to that of the map, and the results of subregion on the right superficial nuclei (SF) were relatively less similar to the spectra. Cluster analysis results of the stability analysis results showed that the signal-to-noise ratio was more than 70 db, each subregion maintained 100% similarity to the results without adding noise, the pearson correlation coefficient could be kept about 0.7 in the low signal-to-noise ratio of 10 db. Conclusion: The clustering results and JULICH maps were highly consistent, which indicated the feasibility of this method. In addition, satisfactory results were also obtained in terms of stability and anti-interference. Compared with the traditional manual segmentation method, the clustering segmentation method proposed in this paper had the advantages of simplicity, high efficiency, and high repeatability.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Smooth fitting of bias field in prostate MRI with peak detection]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.011</link>
<description><![CDATA[Objective: To study correction of the inhomogeneity of grayscale (Bias Field) in prostate MR image. Materials and Methods: Several transverse images derived from magnetic resonance scanning data of prostate. The piecewise constant property of the real image and the smooth change characteristic of the bias field are expressed in the image model. An energy function is constructed and the bias field estimation and tissue segmentation are realized by minimizing the energy function. The initial parameters of the energy function are obtained automatically by using the peak detection technique, and the smoothing fitting of the offset field is realized by using a set of basis functions combined with trigonometric functions and polynomial functions. Results: Some qualitative evaluations showed the significant improvement of prostate MR image with severe intensity inhomogeneity by using our method. The comparison with other methods in some quantitative evaluation indexes (Coefficient of variation, Root mean square and Jaccard similarity) is shown to demonstrate the better result of our method. Conclusion: Peak detection based bias correction method can perfect the intensity inhomogeneity in prostate MR image．]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[The research of influence between different incoherent sampling patterns and point spread functions in MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.012</link>
<description><![CDATA[Compressed sensing (CS), which is a new theory that emphasizes reducing sampling data at the source, is regarded as the most promising technique in fast magnetic resonance imaging (MRI). How to evaluate the incoherence of compressed sensing-magnetic resonance imaging (CS-MRI) accurately is a key point to design the incoherent sampling track in MRI. The existing incoherence evaluation indices still follow those used in CS. They ignore the practical influence of the magnetic resonance devices so the practical performance of these incoherence evaluation indices is much different from that in theory when CS is applied to MRI. The problem is like a “barrier” between CS and MRI and restricts the performance in CS-MRI. The paper proposes to convert the transform point spread function (TPSF) to point spread function (PSF). Therefore, the mathematical relationships between the PSFs and sampling trajectory are formulated. Further, the relationships between the positions of sampling points and the shapes of PSFs are also given. At last, simulation experiments are taken to test PSFs in different sampling modes. Simulation results show that except the width of main lobes and the height of side lobe, the distribution characteristics of side lobes have a major effect on the shapes of the PSF.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Applications of blood oxygen level dependent-functional magnetic resonance imaging in patients with moyamoya disease]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.013</link>
<description><![CDATA[The cerebral hypoperfusion level may vary with the stages of moyamoya disease (MMD). A reasonable therapeutic strategy should be developed according to the perfusion status of each patient. CT perfusion imaging and MR perfusion imaging are commonly used to assess perfusion status in patients with MMD. Unfortunately, the risk of anaphylaxis to contrast media will increase as well. In recent years, the blood oxygenation level-dependent functional MR imaging (BOLD-fMRI) has been increasingly used to evaluate perfusion status and neuronal plasticity in a non-invasive way. Here, we review the progress of BOLD-fMRI in terms of cerebrovascular reactivity (CVR) and non-invasive assessment of the delayed blood flow information and neuronal plasticity in patients with MMD in order to provide a new perspective on the time of operation and prognosis assessment.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Research progress of magnetic resonance imaging in major depressive disorder]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.014</link>
<description><![CDATA[Major depressive disorder (MDD) is a common mental disease, but its etiology and pathogenesis is not clear. Along with the continuous development of MRI sequences and computer technology, some progresses have been made in the diagnosis, treatment and pathogenesis of MDD. In this paper, we summarized the application and progress of magnetic resonance structural and functional imaging in MDD, in order to reveal potential pathological basis and pathogenesis.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of MR technology in accurate and quantitative fat content in nonalcoholic fatty liver disease]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.10.015</link>
<description><![CDATA[Non-alcoholic fatty liver disease has increased in recent years rapidly shows a younger age trend, although it is a benign disease but can affect the progress of other chronic liver diseases and its development may lead to liver failure. Quantitative analysis using MR imaging technology is the focus of current research. As a noninvasive method to diagnose fatty liver quantitatively, 1H-MRS and mDixon techniques can help clinicians to treat liver cells of fatty degeneration to be able to return to normal in a timely manner. This paper reviews the application of 1H-MRS and mDixon techniques in quantitative assessment of  liver fat content in patients with nonalcoholic fatty liver disease.]]></description>
<pubDate>Thu,20 Oct 2016 00:00:00  GMT</pubDate>
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