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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=201203</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[The MRI features of dysembryoplastic neuroepithelial tumors]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.002</link>
<description><![CDATA[Objective:  To analyze the MRI features of dysembryoplastic neuroepithelial tumors (DNET).  Materials and Methods: The MR study of  14 patients with pathologic confirmed DNET was reviewed retrospectively with emphasize on tumor location, morphology, and characters of signal intensity. Results: In 14 DNET, 7 of them located in frontal lobe, 5 in temporal, and 2 in parietal lobe. All lesions involved the brain cortex with hypointense T1WI and hyperintense T2WI without contrast enhancement. FLAIR images showed a hyperintense ring surrounding the lesion. DNET displayed a triangle or wedge-shape lesion in 9 cases. Cystic structure was found in 10 patients. The skull remodeling was found in all  7 superficial DNET. Thirteen DNET showed no contrast enhancement. In 12 DWI scan, the tumor showed increased water diffusion in 11 cases. Conclustion: DNET has a relatively typical MR appearances. Lesion location and morphology, signal intensity, and multiple microcyst might help to make the diagnosis in patient with a DNET.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparative study on localization of motor cortex of patients with brain tumors by rs-fMRI and task-based fMRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.003</link>
<description><![CDATA[Objective:  To evaluate whether rs-fMRI is appropriate and robust for mapping motor cortex in presurgical planning, by comparing the rs-fMRI and task-based fMRI in mapping motor cortex of brain tumors. Materials and Methods: Twelve patients with brain tumors were selected. Their fMRI dataset was analyzed by FMRIB Software Library  Multivariate Exploratory Linear Optimized Decomposition into Independent Components (FSL MELODIC ICA) software (www.fmrib.ox.ac.uk/fsl). Results:  The experimental results showed that the motor activation mappings from rs-fMRI are quite similar to those the task-based fMRI in the patients with tumors far from motor cortex activation (patient 1, 3, 7, 8, 11). However, in each of the patients with tumor around motor cortex (patient 2, 4, 5, 6, 9, 10, 12), the spatial distribution of motor cortex activation from the rs-fMRI does not match the distribution from the task-based fMRI well. Conclusion: Based on our experimental results, we find that the combination of rs-fMRI and task-based fMRI should be treated as a complementary approach to assessing the sensorimotor area in patients with brain tumors, which cannot be performed by rs-fMRI alone.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[Correlation investigate between grade of intratumoral susceptibility signals and relative quantitative of 1H-MRS in patients with brain astrocytic tumours]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.004</link>
<description><![CDATA[Objective:  To investigate the correlation between the grade of intratumoral susceptibility signals (ITSS) in high-resolution susceptibility-weighted imaging(SWI) and relative quantitative of multi-voxel 1H-MRS, and estimate its value on the grade of brain astrocytic tumours. Materials and Methods:  The data of 33 patients with brain astrocytic tumours conﬁrmed by postoperative pathologic were collected. Multi-voxel 1H-MRS calculates respectively the relative quantitative of Choline (Cho)/Creotine (Cr), Cho/N-acetylaspartate (NAA), and  analyze with grade of ITSS correlation. Results: The high grade astrocytic tumours of ITSS classification was obviously higher than the low grade gliomas (P <0.01). The high grade astrocytic tumours of Cho/Cr, Cho/NAA relative quantitative ratio was obviously higher than the low grade astrocytic tumours (P <0.01). The higher the grade of ITSS was, the bigger the Cho/Cr, Cho/NAA of relative quantitative ratio was, which showed positive correlation (r =0.763, r =0.741, P <0.01). Conclusion: There is better positive correlation between grade of ITSS and relative quantitative of 1H-MRS in patients with brain astrocytic tumours. The grade of ITSS in brain astrocytic tumours can be used as classiﬁcation diagnostic index.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[Cerebrospinal fluid artifacts on 2D and 3D fluid-attnuated inversion-recovery images at 3.0 T MR]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.005</link>
<description><![CDATA[Objective:  To study cerebrospinal fluid (CSF) artifacts on 2D and 3D ﬂuid-attnuated inversion-recovery (FLAIR) images at 3.0 T MR by comparing with 1.5 T system. Materials and Methods:  Fifty individuals were examined with 2D FLAIR images with a 1.5 T system, another ﬁfty cases were examined with 2D and 3D FLAIR images with a 3.0 T system. CSF artifacts within ventricles, suprasellar cistern and prepontine cistern were recorded using a 4-point scale (0=no artifacts, 1=artifacts intensity lower than that of gray matter, 2=artifacts intensity equal to that of gray matter, 3= artifacts intensity higher than that of gray matter), 2 and 3 scales were defined as high grade. Results:  On 2D FLAIR images with 1.5 T system,  9 individuals had no CSF artifacts, and there were 94 regions with artifacts in the other 41 cases, among which, 2 scale was the most frequency and occupied 54.3% of all artifacts, and forth ventricle was the most common region. On 2D FLAIR images with 3.0 T system, artifacts were seen at least two regions in every cases, and 3 scale was the most frequency and occupied 50.0%, forth ventricle and prepontine cistern were the most common regions. Compared with 1.5 T system, the ratio of high grade artifacts in ventricle and subarachnoid space was higher on 2D FLAIR images with  3.0 T system. However, there were no artifacts on 3D FLAIR images with 3.0 T system. Conclusion:  Compared with 1.5 T system, high grade CSF artifacts are more often on 2D FLAIR images with 3.0 T system, but 3D FLAIR imaging can complete null CSF signal and eliminate CSF artifacts.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[Analysis of MRI on 12 patients with optic nerve glioma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.006</link>
<description><![CDATA[Objective: To evaluate the diagnosis and the differential diagnosis by MRI on patient with optic nerve glioma. Materials and Methods: The manifestations of MRI were retrospectively analyzed in 12 patients with optic nerve glioma whom conﬁrmed by the operation and pathology. Results: In the shape, it revealed as irregular in 5 cases, fusiformis  3 cases, tortuous  4 cases. The glioma involved the orbit in 11 cases, intracanal segment 8 cases, intraocular segment 1 case, optic chiasm 4 cases, optic tract 1 case. For MRI, the presentations of the tumor revealed as iso- or hypointense signal on T1-weighted images, and iso- or hypointense, or hyperintense signal on T2-weighted images. In the tumor, there was homogeneous signal in 10 cases, and cyst lesions with inhomogenous signal in 2 cases, there was not enhanced in 3 cases, enhanced slightly 6 cases, enhanced obviously 3 cases. Nine patients were undergone dynamic contrast-enhanced MRI and time-signal intensity curve including ﬂat in 3 cases, gentle slope in 4 cases and straight slope in 2 cases. Conclusion: It is typically to reveal the features of  location, shape, and extent of optic nerve glioma on MRI. MRI is of great value to make a diagnosis and differential diagnosis on optic nerve glioma.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[Clinical value of MR enterography in pediatric patients]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.007</link>
<description><![CDATA[Objective:  To discuss the MR features of the small intestinal disease of children, and to assess the usefulness of MR enterography (MRE) in pediatric patients. Materials and Methods: The MRI findings of l2 cases of small intestinal diseases proved by operation and pathology were reviewed. Before the examination,  the children suspected of various kinds of small intestinal diseases were administered isosmotic mannnitol (2.5%) as oral enteric contrast agent and 0.3 mg/kg of raceanisodamine hydrochloride was injected intravenously, MR scanning was performed 5 to  10 minutes later. The pulse sequences include coronal true fast imaging with steady-state precession (TrueFisp) images, axial and coronal T1-weighted images, T2-weighted fat-suppressed images, coronal fat-suppressed three-dimensional gradient-echo MR image, immediately followed by contrast enhanced axial and coronal T1-weighted fat-suppressed images. Results: The taste of isosmotic mannitol was good (slight sweet) and acceptable by all children. MRE features of many kinds of small bowel diseases were clearly displayed, including wall thickening, mesenteric ﬁbrofatty change, mesenteric vasculature change, and so on. Six of 12 patients were Crohn’s disease, MRI displayed 16-segment inflammatory bowel which demonstrated wall thickening, luminal stenosis and enhanced image demonstrated intestinal lesion is signiﬁcantly enhancement. Lymphoma, enteric persimmon lithiasis, intussusception, Chronic duodenal ulcer, duodenal perforation, gastrointestinal anastomotic ulcer one each. Conclusion: MRE is a simple, safety, noninvasive, efective method without the need for ionizing radiation for evaluating small bowel diseases.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[3D MRI investigation on fetal surface malformations]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.008</link>
<description><![CDATA[Objective:  To investigate the clinical value of three dimensional magnetic resonance imaging (3D MRI) in displaying the normal and abnormal structures of fetal surface malformations. Materials and Methods: Thirty-four pregnant women were examined by conventional prenatal ultrasonography (US) and MRI, 36 fetus with surface malformations were conformed by follow-up results and autopsy. Single-shot fast spin-echo T2 weighted sequences (SSFSE) and thick-slab heavy T2WI with SSFSE were performed, 3D MRI with three dimensional fast image employing steady-state acquisition (3D FIESTA) were acquired. Volume rendering (VR), muti-planar reconstruction (MPR) and MR virtual endoscopy (MRVE) were employed in image post-processing on workstation. The results from 2D MR, 3D MRI and US images were compared with each other as well as the autopsy and follow-up results. Results: A total of 42 fetal surface malformations were identified by autopsy and follow-up after birth. 3D MRI was not affected by the complex superﬁcial curvature changes, and could clearly demonstrate the surface features, and spatial positions of the fetus. The sensitivity, specificity, accuracy of 3D MRI/2D MRI/3D US were 90.48%/69.05%/95.12%, 100%/100%/99.81%, 99.31%/97.74%/99.48%. There were obvious statistical difference for sensitivity and accuracy of 2D MRI and 3D MRI, and unobvious statistical difference for sensitivity, speciﬁcity, and accuracy of 3D MRI and 3D US. Conclusion: 3D MRI is better than conventional 2D MRI in displaying fetal normal surface structure and malformations, and it has lager fov and higher soft tissue resolution than US. The 3D fetal MR imaging can be used as a complementary strategy to US in diagnosing fetal surface malformations.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[3D CE-MRA for lower extremity arteriosclerosis obliterans collateral circulation]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.009</link>
<description><![CDATA[Objective: To evaluate three-dimensional dynamic contrast-enhanced magnetic resonance angiography (3D CE-MRA) in the display of lower extremity collateral circulation of arteriosclerosis obliterans (ASO). Materials and Methods: Twenty-nine patients with ASO were recruited with analysis of 3D CE-MRA. The arteries included bilateral common iliac artery, internal and external iliac artery, common femoral artery, deep and superﬁcial femoral artery, popliteal arteries, anterior and posterior tibial artery and peroneal artery were analyzed and compared with that of the controls. Results: There were 318 lesions including 113 collateral circulation, 15 external iliac arteries, 15 common femoral arteries, 27 deep femoral arteries,  31 superﬁcial femoral arteries, and 25 anterior tibial arteries. Conclusion: 3D CE-MRA is helpful to display the collateral circulation in ASO of lower extremity.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[Measurement of unilateral glomerular filtration rate with dynamic contrast-enhanced MRI in swine renal dysfunctional model]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.010</link>
<description><![CDATA[Objective: To investigate the accuracy in estimating single kidney glomerular filtration rate (GFR) derived from low dose dynamic contrast-enhanced MR (MR Renography, MRR) and Patlak model in swine with unilateral renal arterial stenosis (RAS) and hydronephrosis on 3.0 T. Materials and Methods: In this animal care and use committee–approved study, RAS was surgically created in five pigs and hydronephrosis was surgically induced in another five pigs. Dynamic low-dose gadopentetate dimeglumine (0.04 mmol/kg) contrast enhanced MR imaging was performed in all ten pigs with a 3.0 T scanner. 99Tcm-DTPA scintigraphy soon afterwards provided reference standard of single-kidney GFR. Average signal intensities (SI) of region of interest on bilateral renal cortex were measured for each series, relative SI increments were calculated and the time-SI curves were plotted. Patlak model was used to analyze the aortic and renal cortical signal intensity vs. time curves (MRR) to obtain split GFRs. Values were reported as mean ± standard deviation (SD). GFRs measured with MRR were compared with the reference value from scintigraphy using Pearson ’s correlation coefficient. The agreements between the two methods were assessed with the Bland-Altman plots and intraclass correlation coefficients (ICC ), respectively. Results: Unilateral GFR from MR renography derived from Patlak model agreed well with reference measurements [(40.72±15.27) ml/min, 7.60-74.90 ml/min] in cortex regions [(39.60±12.42) ml/min, 7.62-66.40 ml/min)] (r =0.836, P = 0.000, n=20). Bland-Altman analysis showed that the average difference between GFRMR and reference values was － 1.11 ml/min with a 95% conﬁdence interval from －17.46 ml/min to 15.24 ml/min, of all 20 coupled GFRs, differences were within range of 95% conﬁdence interval. The ICC value was 0.9508 (P <0.01). There statistical analysis showed there was a good consistence between GFRMR and standard reference. Conclusions: GFRs could be measured with low-dose MR renography and Patlak model, it has good consistence with standard reference from 99Tcm-DTPA scintigraphy.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[MR imaging of anatomical variations and fatty deposit of the pancreas]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.012</link>
<description><![CDATA[Pancreatic parenchyma and its ductal system are formed by the dorsal and ventral pancreatic buds at the early stage of embryologic development following its rotation. Various anatomical variations may happen during the rotation and fusion process. Physiological change of the pancreas refers to the phenomenon that the volume decreases and the acinar tissue is replaced gradually by fatty tissue. Magnetic resonance imaging is widely applied in assessing pancreatic disorders nowadays. Recognition of anatomical variations and fatty deposit of the pancreas conduces to interpreting correctly diverse findings on MR imaging, and laying a solid foundation for diagnosing accurately the diseases in clinical work.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[Status of MR imaging for focal cortical dysplasia]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.013</link>
<description><![CDATA[Focal cortical dysplasia (FCD) is characterized by the dyslamination and the presence of abnormal neurons and glia arranged abnormally in focal areas of the cerebral. FCD is a common cause of pharmaco-resistant epilepsy. With the recent progress in magnetic resonance imaging (MRI), FCD are being identified increasingly. MRI can show the topographical characterization of the lesion with respect to its location, size and extension. FCD exhibits a variety of features: local cortical thickening, blurring of the grey-matter to white-matter surface, signal changes in the underlying white matter. The research and current status of MRI on FCD were reviewed in this article.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of clinical application and research of MRS in temporal lobe epilepsy]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.014</link>
<description><![CDATA[MRS, a non-invasive way to detect markers of cerebral metabolism, provide some important characteristic indicators of neural metabolic, opens a new way to study epilepsy with a metabolic point of view. In this paper, the significance of the metabolism content and their changes are analysesed,the values of lateralization orlocalization of preoperative of epileptic foci and postoperative prognosis are reviewed.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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<title><![CDATA[Progress of magnetic resonance image on denoising]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.03.015</link>
<description><![CDATA[Magnetic resonance imaging (MRI) is of great importance in medical diagnosis, and denoise is one of the basic problems in MR image processing and  analysis. Therefore, development of methods for eliminating image noise in MRI has important clinical significance and application value. In this paper, denoise in the space domain, transform domain and by multi-scale analysis and other aspects of MRI image denoising algorithms are reviewed, analyzed and their performances are compared. Finally, prospects and future trends for the ﬁeld of medical image denoising are analyzed.]]></description>
<pubDate>Tue,20 Mar 2012 00:00:00  GMT</pubDate>
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