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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=201506</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[The preliminary study of resting-state functional magnetic resonance in patients with leukoaraiosis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.003</link>
<description><![CDATA[Objective: To investigate the abnomality of spontaneous neural activity in patients with leukoaraiosis using blood oxygenation level dependent-functional magnetic resonance imaging (BOLD-fMRI). Materials and Methods: Nineteen patients with mild LA(The mild LA group), twenty-one patients with severe LA (The severe LA group) and nineteen age-matched healthy controls(The HC group) underwent the rs-fMRI scans, and the ALFF maps were computed and analysed. Results: Compared with the mild LA group, the severe LA group demonstrated decreased ALFF in the left precuneus and right angular gyrus(P＜0.05, corrected). Moreover, compared with healthy controls, the severe LA group showed significantly decreased ALFF in the left precuneus, right angular gyrus and right middle frontal gyrus (P＜0.05, corrected). Conclusion: Patients with LA show abnormality of spontaneous neural activity.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[The study of resting state functional magnetic resonance and fiber tracking in multiple sclerosis patients with simple spinal cord involvement]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.004</link>
<description><![CDATA[Objective: To explore the changes of the brain functional activity and the integrity of brain white matter in multiple sclerosis patients with simple spinal cord involvement (MS-SSCI) by using resting-state functional magnetic resonance imaging (RS-fMRI) and fiber tracking. Materials and Methods: Amplitude of low-frequency fluctuation (ALFF) was compared between 20 MS-SSCI and 20 age-and gender-matched normal controls by using RS-fMRI and the brain regions showing significant difference between groups were defined as the regions of interest (ROI). Fiber tracking was then used to reconstruct the white matter fiber within ROI and then the fractional anisotropy (FA) and the apparent diffusion coefficient (ADC) were compared between the two groups. The relationships between ALFF, FA, ADC of ROI and the expanded disability states scale (EDSS) scores were further explored. Results: Compared with the controls, ALFF decreased in the right hippocampus, but increased in the left middle frontal lobe, left posterior cingulate gyrus and right middle occipital lobe (two-sample t test, after AlphaSim correction, P＜0.01, voxel size＞40), MS-SSCI showed significant difference of FA (tright hippocampus=2.099, Pright hippocampus=0.042) and ADC  (tright hippocampus=－2.053, Pright hippocampus=0.047)in the right hippocampus; A significant correlation between EDSS scores and ALFF was noted only in the left posterior cingulate gyrus, while no significant correlation between structural parameters and EDSS scores. Conclusion: Our results detected functional and structural abnormalities in MS-SSCI. Moreover, fluctuational abnormalities was closely related to cognitive impairment.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparison of three dimensional Fast Time-of-flight and standard time-of-flight MR angiography in intracranial arteries]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.005</link>
<description><![CDATA[Objective: To investigate the value of 3D Fast-TOF MRA in intracranial arteries. Materials and Methods: 3D Fast-TOF and 3D standard TOF sequences were performed in 31 patients. MIP images of intracranial arteries were reconstructed. The image quality (including artifacts), carotid artery branches were compared between the two groups. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of the source images of both groups were compared. Results: The acquisition time of 3D Fast-TOF group and 3D standard TOF group were 3.31 min and 5.28 min. The image score of carotid artery branches in 3D Fast-TOF group and 3D standard TOF group was 3.21±0.86 and 2.51±0.64 respectively. Significant statistical difference was existed (P＜0.01). Demonstration of the carotid artery branches on 3D Fast-TOF group was superior to that of 3D standard TOF group. The image quality scores of the 3D Fast-TOF group and 3D standard TOF group were 4.84±0.58, 4.87±0.56. SNR of 3D Fast-TOF MRA group and 3D Standard TOF group was 161.17, 3D Fast-TOF MRA group; CNR was 124.13±11.28,113.04±29.90. No statistical difference of image quality, SNR and CNR was existed between these tow groups (P＞0.05). Conclusion: We demonstrated that 3D Fast-TOF group is a new intracranial MRA technique which could shorten acquisition time, and preserve good imaging quality and high spatial resolution.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[Value of using contrast-enhanced magnetic resonance imaging for the evaluation of the short-term effects of radiotherapy for nasopharyngeal cancer]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.006</link>
<description><![CDATA[Objective: To investigate the value of using contrast-enhanced magnetic resonance imaging (MRI) for efficient evaluation before and after radical radiotherapy for nasopharyngeal cancer, and to assess whether the use of visual partitioning analysis for tracking and observing nasopharyngeal cancer staging is sensitive to radiotherapy. Materials and Methods: In total, 50 patients who were preliminarily diagnosed with nasopharyngeal cancer through pathological examinations were retrospectively analyzed, including 9 cases with stage T2, 29 cases with T3, and 12 cases with T4. All cases underwent short-term radiotherapy; T1 weighted imaging, T2 weighted imaging, and contrast-enhanced MRI were performed before and after radiotherapy. visual partitioning analysis was used to comparatively measure the variation in morphology and range of foci, as well as the involvement of surrounding tissues. All the above mentioned data were statistically analyzed using independent sample t-tests. Results: Compared to the conditions before radiotherapy, the tumor foci of 9 cases with parapharyngeal space and/or oropharynx involvement, 29 cases with skull base and/or medial pterygoid involvement, and 7 cases with cranial nerve and/or cavernous sinus and/or paranasal sinus and/or lateral pterygoid involvement showed significant shrinkage or reduction in the size of their cervical lymph nodes, along with non-apparent enhancement or no trend in enhancement (P＜0.05). However, among 5 T4 cases, the tumor size non-significantly changed in 4 cases and increased in 1 case (P＜0.05); moreover, the intensities of the standardized enhancement of foci did not significantly change. Conclusion: The changes in nasopharyngeal cancer before and after radiotherapy can be sensitively determined through contrast-enhanced MRI, which may thus have good clinical applicability in the effective evaluation of nasopharyngeal cancer. Moreover, the efficacy of radiotherapy fornasopharyngeal cancer may be associated with the pathological staging.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[Carotid atherosclerotic plaque composition analysis and classification with 3.0 T MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.007</link>
<description><![CDATA[Objective: To discuss the capability of 3.0 T high resolution MRI to differentiate carotid atherosclerotic plaque composition and to predict plaque stability. Materials and Methods: Thirty-three consecutive patients with carotid atherosclerotic plaques were scanned using GE 3.0 T MRI. MRI protocols include three-dimensional time-of-flight (3D-TOF), double-inversion recovery T1 weighted image, T2 weighted image, proton density weighted image and carotid artery MRA. Plaque composition and its type were collected and analysed. Results: Total 63 carotid atherosclerotic plaques were found in 33 patients. According to American Heart Association classification, type Ⅰ-Ⅱ plaques accounts for 12.7% of total plaques, type Ⅲ accounts for 27% of total, type Ⅳ-Ⅴ together occupies 19% of them, type Ⅵ with number of 31.8% is the biggest in the group, and type Ⅷ accounts for 9.5%. There was no statistically significant difference for plaque location (Fisher’s exact test: P=0.016). Thirty one stable plaques and 32 unstable plaques were detected of all 63 plaques. There was statistically significant difference between stable plaque group and unstable plaque group in terms of the occurrence rate of lipid rich necrotic core, hemorrhage, thrombosis and integrity of fibrous cap  (P＜0.05). No significant differences were found for the number of calcification  (P＞0.05) between the two groups. Conclusion: 3.0 T high resolution MRI has the capability to differentiate and identify plaque compositions between table plaque group and unstable plaque group. It can be an important guidance for treatment option and outcome evaluation.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[Deltoid contracture in children: the characteristic analysis of 3.0 T high field strength MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.008</link>
<description><![CDATA[Objective:  To study the 3.0 T MRI characteristic features of deltoid contracture in children. Materials and Methods: The study comprised 18 children with deltoid contracture. All children were performed with X-ray and 3.0 T MRI. MR routine scanning sequences were T1WI, T2WI, T2WI with fat suppression sequence, and axial fast gradient echo (GRE) T2WI sequence. CT scan was conducted in 9 children. Results: MR T1WI and T2WI showed that involved deltoid became thin and  atrophic in different degree, and the inner muscular clearance became broad in 18 cases. GRE-T2WI showed that out above humerus head there had low signal fiber band along to the outside of the deltoid contracture in 16 cases, and adjacent subcutaneous fat focal thickening to fill in the surface of band. Pathological results showed, in MR GRE-T2WI, contracture fibrous bands were dense fibrous connective tissue, hyaline degeneration, the striated muscle to atrophy or disappear, and showed adipose tissue to fill between muscle tissue; Coincidence rate of MR GRE-T2WI manifestation and pathology results was 88.9%. Conclusion: 3.0 T MRI can directly show exactly contracture deltoid and hyperplasia fibrous bands structure, and then determine a clear diagnosis.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[Analysis on correlation between the characteristic of breast cancer MRI and axillary lymph node metastasis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.009</link>
<description><![CDATA[Objective:  To explore the relationship between the characteristic of breast cancer MRI and axillary lymph node metastasis, thus offering therapeutic schedule and prognosis in treating breast cancer. Materials and Methods: Forty-four cases of breast cancer were confirmed by pathology and preoperative MR scan, twenty-six cases of these patients were confirmed with ipsilateral axillary lymph node metastasis. Two experts read MRI image, and analyze the relationship between the ratio of different masses' short axis over long axis, dynamic enhanced MR features and the axillary lymph node metastasis of breast cancer. Results: (1) MR morphology analysis shows that the ratio of breast lumps' short axis over long axis has a negaive correlation with axillary lymphnode matastasis (t=5.892，P＜0.05). (2) Edge reinforcement tumors' early intensive rate of breast cancer has positive correlation with axillary lymph node metastasis (t=3.966, P＜0.01). Conclusion: The larger the ratio of breast lumps' short axis over long axis is, the smaller the possibility of axillary lymph node metastasis will be, the bigger edge reinforcement tumors' early intensive rate is, the greater the possibility of lymph node metastasis will be, and associated with poor prognosis. Therefore, axillary lymph node metastasis of breast cancer has good correlation with MR characteristic. MR examination can judge prognosis of breast cancer and axillary lymph node properties, then provide reference for effective treatment.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[Investigation of prostate cancer using intravoxel incoherent motion MR imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.010</link>
<description><![CDATA[Objective:  To evaluate the diagnostic value of intravoxel incoherent motion diffusion-weighted imaging for prostate cancer. Materials and Methods: Forty-five patients with prostate cancer and 13 patients without prostate cancer underwent magnetic resonance imaging. DWI was performed by using 8 b values (0, 50, 100, 150, 200, 400, 600, 800 s/mm2). Biexponential fits were applied to diffusion decay curves by special software to calculate pure molecular-based diffusion coefficient (D), pseudo diffusion coefficient of perfusion (D*) and perfusion fraction (f) on the basis of the IVIM model, parameter maps were also calculated for all parameters. Independent samples group t tests were performed to evaluate the statistical significance between cancerous tissue and noncancerous tissue. Results: The D, D* and f values in cancerous tissue were (0.83±0.14) ×10-3 mm2/s, (5.88±1.21)×10-3 mm2/s and (14.3±4.7)%, respectively. The D, D* and f values in noncancerous tissue were (1.30±0.23)× 10-3 mm2/s, (6.25±1.10)×10-3 mm2/s and (15.4±3.8)%, respectively. The D value was significantly (P=0.000) lower in cancerous tissue. D* and f values were not significantly different in both tissues. The area under the receiver operating characteristic-analyses for D value was 0.952, sensitivity and specificity were 100%, 66.7%, respectively. Conclusion: Intravoxel incoherent motion diffusion-weighted imaging may offer additional information about diffusion and perfusion in prostate cancer. Pure molecular-based diffusion coefficient (D) has an important value in diagnosing prostate cancer.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[Correlation of imaging features and histop athoiogy in postpartum placental accrete]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.011</link>
<description><![CDATA[Objective:  To investigate the features and diagnostic value of MRI and CT in postpartum placenta accreta(PA). Materials and Methods: Fourteen cases PA comfirmed clinically or pathologically were retrospectively analyzed (aged 24—39 years old, with an average of 30.6±2.5 years old). Ten cases were examined by MRI scans, four cases by conventional and contrast-enhanced CT scans, their imaging appearances were analysed. Results: Fourteen cases were correctly diagnosed with MRI and CT. Uterus enlarged in various degrees,  the mixed signal intensity mass was showed in it. The integrity of endometrium and junctional zone of myometrium was destructed. Placentas of shorter gestational age appeared to be a mixed simple mass, the longer ones to be lobulated structure distinctively. Compared with the signal intensity of the outer layer of the myometrium, the signal intensity of implanted placenta showed isointense or hypointense and its boundary with uterus was not clear on T1WI. On T2WI, it showed significantly mixed hyperintense, and spread strip and punctate low signal shadows. The lesions invaded myometrium, and made the myometrium thinning locally. The lesions invaded close to perimetrium in 3 cases. By CT scan, they showed a ill-defined low density, by enhancement scan, placentas were heterogeneous enhancement significantly, appeared to be“petal shaped”, similar to enriched degree of myometrium. The necrotic area were not enhanced, depicted as“crack shaped”. Conclusion: Compared with CT, MRI can make correct diagnosis of PA and judge the general degree of placental invasion, as similar with pathologic types. It is a kind of auxiliary diagnostic tool ideally.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of quantitative evaluation of inflammatory activity by using wrist dynamic contrast-enhanced MRI in rheumatoid arthritis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.012</link>
<description><![CDATA[Objective:  To investigate the value of quantitative evaluation of inflammatory activity by using wrist dynamic contrast-enhanced MRI (DCE-MRI) in rheumatoid arthritis (RA) patients. Materials and Methods: Twenty patients with clinically and pathologically proved RA underwent wrist DCE-MRI examination, Krenn scoring of synovial inflammatory, clinical scoring of DAS28 and serological examination. Quantitative parameters including the volume transfer constant (Ktrans), rate constant (Kep), extravascular extracellular volume fraction (Ve), plasma volume (Vp) and semi-quantitative parameters including the time to peak (TTP), maximum concentration(Cmax), the area under concentration-time curve (AUC), maximum slope (Slopemax) of wrist synovial lesions were derived from DCE-MRI data. Relationship between quantitative and semi-quantitative parameters and Krenn scores of synovial inflammatory, clinical score of DAS28 and serological results were analyzed by using correlation analysis. Ktrans values between different grades of synovitis were analyzed by using Student t test. Results: The average Ktrans value of 20 patients was (1.27 ± 0.59) ml/min, the average Krenn score was 3.38 ± 1.53, and the average DAS28 score was 4.80 ± 0.94. Pathologically, six patients had high-grade synovitis and eleven patients had low-grade synovitis. Positive correlation was found between Ktrans and Krenn scores, as well as between Ktrans and DAS28 scores (r=0.698, P＜0.01; r=0.510, P＜0.05 respectively). However, no correlation was found between Kep, Ve, Vp, TTP, Cmax, AUC, Slopemax and Krenn scores, DAS28 scores, serological results (P＞0.05). Ktrans values in high-grade synovitis group were higher than these in low-grade synovitis group (t=4.05, P＜0.01). Conclusion: Ktrans values derived from DCE-MRI can be used to reflect the clinical and pathological inflammatory activity of RA.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of FIESTA sequence in the diagnostis of  inferior vena cava lesions with Budd-Chiari syndrome]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.013</link>
<description><![CDATA[Objective:  To study the FIESTA sequence in the assessment of the inferior vena cava lesions in patients of Budd-Chiari syndrome (BCS). Materials and Methods: To retrospectively analyze the inferior vena cava stenosis of 51 patients diagnosed with BCS, with the DSA as the gold standard for diagnosis, to assess the utility of FIESTA sequence in the diagnosis of inferior vena cava lesions, including the sensitivity, specificity, diagnostic accuracy in detecting lesions and the ability in displaying inferior vena cava thrombosis and the inferior vena cava varicosity. Results: Forty-one cases were correctly diagnosed by MRI, the sensitivity was 97.61%, specificity 55.56%, accuracy 90.20%. Eight cases of inferior vena cava thrombosis and 4 cases of inferior vena cava varicosity were found. Conclusion: The FIESTA sequence has the characteristics of intuitive and high accuracy to display inferior vena cava lesions of BCS, and without contrast medium. So the FIESTA sequence can be used as regular sequence to diagnose inferior vena cava lesions of BCS.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[Aassessment of diffusion-weighted imaging in staging liver fibrosis in rabbits]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.014</link>
<description><![CDATA[Objective:  To evaluate the accuracy of apparent diffusion coefficient(ADC) correlates on staging liver fibrosis. Materials and Methods: The study consisted of three groups: HF group (n=32), control group (n=15) and supplemental group (n=12). Rabbits from control and HF group underwent conventional MRI and DWI scan and the liver ADC values were measured. In HF group, eight rabbits randomly underwent MRI examinations at 4, 5, 6, 10 weeks after CCl4 administration. The correlation between ADC values and HF stages was assessed. The diagnostic performance of DWI for staging HF was compared using the receiver operating characteristic curve analysis on the basis of the histopathologic analysis of HF. Results: Significant differences of ADC values were present among HF stages (F=5.344, P＜0.005). The ADC values were correlated with the HF stages (r=－0.630, P＜0.001). Sensitivity, specificity, positive (PPV) and negative predictive values (NPV) were for ≥S1: 75.00%, 55.56%, 85.70%, 38.50%, respectively; for ≥S2: 79.2%, 58.8%, 73.1%, 66.7%; for ≥S3: 87.5%, 80.0%, 73.70%, 90.9%; for S4: 87.50%, 66.67%, 38.90%, 95.7%. Conclusion: DWI can offer important assistance in staging HF as a non-invasive technique.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[The preliminary study of virtual magnetic resonance imaging in case of the main field inhomogeneity]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.015</link>
<description><![CDATA[Objective:  The purpose of this paper is to design a magnetic resonance imaging simulator based-on Bloch equation, which can be used to simulate the impact of the main field inhomogeneity to the virtual magnetic resonance imaging (MRI). Materials and Methods: The magnetic resonance imaging simulator is implemented by C language. In the imaging process, the magnetization vector of each voxel in the virtual object is calculated by the discrete time solution of the Bloch equation. It assumes two different models of the main field inhomogeneity and assigns the spatial position matrix of inhomogeneity, which is used as the input of virtual MRI simulation. Compare the simulated images with the corresponding actual experimental images. Results: The MRI simulator allows the simulation of images impacted by the inhomogeneity of the main magnetic field. The imaging results can meet our expectation. Conclusion: The MRI simulator is helpful for engineering and scientific research in the analysis of the main magnetic field inhomogeneity effects on imaging.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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<title><![CDATA[Research progress in dilated Virchow-Robin spaces and related diseases]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2015.06.016</link>
<description><![CDATA[Virchow-Robin spaces (VRS), also known as lymphatic clearance around the blood vesselsof some physiological and immunological functions, are pia - lined extensions of the subarachnoid space between leptomeningeal mesothelial cells and blood vessels. Up to present, magnetic resonance imaging (MRI) has been served as the chief role in defining VRS. This review summarizes the formation mechanism, physiological function, complication of VRS and tries to analyze the relationship between neurological disorders and the signal intensities on MRI for supporting a timely clinical diagnosis of some specific neurological disorders.]]></description>
<pubDate>Sat,20 Jun 2015 00:00:00  GMT</pubDate>
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