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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=201304</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[Non-contrast-enhanced MR angiography for evaluation renal artery stenosis: comparison with CT angiography]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.001</link>
<description><![CDATA[Objective: To explore the application of non-contrast-enhanced magnetic resonance angiography (MRA) with time-spatial labeling inversion pulse (Time-SLIP) for assessment of renal artery stenosis (RAS) comparing with computer tomography angiography (CTA). Materials and Methods: Twenty-two patients [12 men and 10 women, mean age: (47.4±9.2) years] in the suspicion of RAS were evaluated with MRA and CTA in the same period. Coronal and axial true steady-state free-precession (SSFP) sequences with Time-SLIP technique were performed on a 1.5 T MRI system for MRA imaging. Image quality and grade of RAS were evaluated. The Unenhanced-MRA images were compared against CTA results. Results: Forty-six renal arteries were included in the statistical analysis. Image quality of MRA was excellent in 63% (29 of 46), good in 28% (13 of 46) and moderate in 9% (four of 46) of patients. The agreement between Time-SLIP MRA and CTA assessments for RAS grading was excellent, with a Spearman rank-order correlation coefﬁcient (r) of 0.991 (P<0.01). The sensitivity and speciﬁcity of non-enhanced-MRA for the detection of signiﬁcant RAS (≥50%) were 100% and 97.1% using CTA as the gold standard. Conclusion: Non-contrast-enhanced MRA with Time-SLIP is an appropriate method for assessment of renal artery stenosis.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[The clinical value of 3D contrast-enhanced MR angiography in diagnosis and treatment of aortic aneurysms]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.002</link>
<description><![CDATA[Objective: To assess the clinical value of three-dimensional dynamic contrast-enhanced MR angiography (3D CE-MRA) in the diagnosis and treatment of aortic aneurysms. Materials and Methods: Nine hundred and twenty five patients underwent 3D CE-MRA with three-dimensional reconstruction on workstation. The clinical role was evaluated for treatment planning. Results: In 925 patients with aortic aneurysms, aortic real aneurysms were 479 cases ( thoracic 138, thoracoabdominal 29, and abdominal 312), aortic dissection 407 cases ( Stanford type A 84, type B 232, and intramural hematoma 91), and aortic pseudoaneurysms 39 cases (thoracic 21, and abdominal 18). 3D CE-MRA clearly demonstrated the type, morphology, location, detail of aortic aneurysm, and 3D relationship with adjacent arteries. The parameters at 3D CE-MRA coincided well with those at DSA in all cases with endovascular graft exclusion (P>0.05). 3D CE-MRA was very helpful for surgery and endovascular treatment. Among them, 352 cases were perfumed with endovascular graft exclusion (aortic real aneurysms 195, aortic dissection 126, and aortic pseudoaneurysms 31), 115 cases with surgery (aortic real aneurysms 47, aortic dissection 63, and aortic pseudoaneurysms 5). Conclusions: 3D CE-MRA is a fast, noninvasive and efﬁcient technique in diagnosis and treatment of aortic aneurysms. It can provide reliable information for surgery and endovascular treatment, and could be used as the first choice of patients with renal insufﬁciency.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Assessment of idiopathic growth hormone deficiency in the morphologically normal pituitary using dynamic contrast-enhanced MR imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.003</link>
<description><![CDATA[Objectives: To investigate the dynamic contrast-enhanced MR imaging features of pituitary in the idiopathic growth hormone deficiency (IGHD) patients with morphologically normal pituitary gland. Materials and Methods: 21 IGHD patients with normal pituitary morphology and 17 healthy age-matched controls were included for analysis. Multisection coronal dynamic contrast-enhanced MR imaging of pituitary was performed. Time to peek (TTP) and maximum enhancement ratio (Rmax) were derived from the signal intensity-time curve of anterior pituitary and compared between IGHD patients and normal controls using the independent t test. Pearson correlation analysis was used to determine the correlation between the TTP or Rmax and the growth hormone deﬁciency levels. Results: The IGHD patients had a prolonged TTP than normal controls (P<0.05), but the Rmax was not signiﬁcantly different from that in normal controls (P>0.05). The levels of serum growth hormone were negatively correlated with the TTP (P<0.05), but not with Rmax (P>0.05). Conclusions: A delayed TTP on dynamic contrast-enhanced MR imaging could be indicative of IGHD in symptomatic patients with a morphologically normal pituitary. The degree of growth hormone deficiency was associated with regional perfusion delay.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Clinical usefulness of 2D MRCP combine with BFFE in older patients with common bile duct stones]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.004</link>
<description><![CDATA[Objective: The purpose of our study was to assess the clinical usefulness of conventional two-dimensional (2D) magnetic resonance cholangiopancreatographic (MRCP) and balance fast ﬁeld echo (BFFE) sequence in older patients with common bile duct stones (CBDS). Materials and Methods: MRCP preformed in 114 older patients, who with sepected CBDS, ranged from 2010-1 to 20011-12, two  reviewers was present retrospectively evaluated MRCP images with 2D-MRCP, BFFE and T2-weighted MR images. The results compared with ERCP or surgical ﬁndings. Results: CBDS was found in 108 of 114 patients with MRI. CBDS was found in 99 of 114 patients with ERCP or surgical ﬁndings. The correlation of MRI and ERCP or surgical ﬁndings was calculated (χ2=4.281, P=0.031). Conclusions: 2D-MRCP with BFFE is a safe, effective means of mamaging sepected common bile duct stones of older non-cooperative patients.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparative study of DWI and Fi-broscan in diagnosis of liver fibrosis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.005</link>
<description><![CDATA[Objective: Comparative study the diagnostic value of diffusion weighted imaging (DWI) and Fi-broscan(FS)in diagnosis of liver fibrosis. Materials and Methods: Thirty-ﬁve hepatic ﬁbrosis patients and 21 normal controls received DWI (b1=0s/mm2, b2=600s/mm2), ADC value of different fibrosis stages was measured, while 33 patients and all 21 normal controls received FS. The elastic stiffness value (stiffness) achieved in 10 successful FibroScan examinations was taken as Fi-brosan index. Analysis of variances was performed to compare the difference among the groups in both examinations. ROC curve was used to analyze the sensitivity and speciﬁcity of DWI and FS. Results: The value of stiffness was gradually increased from the liver fibrosis stage S0 to S4, while the mean ADC value decreased as the severity of liver ﬁbrosis increased(P＜0.01). Between control group and S1, S2, S3, S4 group and among group S2, group S3, group S4 was signiﬁcant. Sensitivity of DWI and FS was 79.40% and 86.33%. Speciﬁcity of DWI and FS was 83.60% and 76.91%. Conclusions: Sensitivity of FS is higher than DWI, while specificity of DWI is superior to FS. Therefore, the application both DWI and FS is the best examinational method for early diagnosis and de-grading of liver ﬁbrosis.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[The comparison between monoexponential and biexponential function of multi-b DWI in evaluation of clear cell renal cell carcinoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.006</link>
<description><![CDATA[Objective: To probe the value of monoexponential and biexponential function used in multi-b DWI on the grading of the CCRCC before the surgery. Materials and Methods: The imaging and pathological data sets of 32 cases with CCRCC were assessed retrospectively. There were low grade (Group 1) and high grade (Group 2) group confirmed by Fuhrman Grading. Based on the conventional MR images, the region of interesting was plotted by a radiologist, and ranges from 0.30 cm2 to 0.45 cm2 in tumorous parenchyma on multi-b DWI. The signal intensity of ROI on DWI each b value were recorded. The ADC value is calculated in monoexponential function, and F, Dfast and Dslow were calculated in biexponential function. The differences of each parameter between two groups were compared with nonparametric test. The receiver operating characteristic curve (ROC) was performed to evaluate diagnosibility during four parameters. There is a significant difference when the P<0.05. Results: 20 cases of low grade CCRCC and 12 cases of high grade were confirmed by the pathological test. There is not a significant difference (U=50.0, P=0.71) for ADC between two groups. Compared with Group 1, the F decreased in Group 2 (U=18.0, P=0.01), but Dfast and Dslow increased in Group 2 (U=15.0, P=0.01. U=20.0, P=0.02 respectively). F, Dfast and Dslow have the similar sensitivity and speciﬁcity in differential diagnosis between two groups (P=0.61, 0.77 and 0.44 respectively). Conclusions: Compared with the monoexponential function of multi-b DWI, the biexponential function is more suitable for grading of CCRCC preoperatively.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of dynamic contrast-enhanced MRI in assessing the early-term effectiveness of high-intensity focused ultrasound ablation of hysteromyoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.007</link>
<description><![CDATA[Objective: To retrospectively evaluate dynamic contrast-enhanced MRI (DCE-MRI) features of hysteromyoma after high-intensity focused ultrasound (HIFU) ablation. Materials and Methods: Thirty-there patients with hysteromyoma underwent HIFU ablation. In all patients, DCE-MRI was performed prior to and 1st weeks after HIFU. Then the patterns of the peripheral enhancement of hysteromyoma were evaluated, judged it was complete ablation or not. Results: In twenty-five of thirty-there patients, thin rim enhancement around the ablation zone was seen on the DCE-MRI after first ablation, which showed no relapse lesion after 6 months, that complete ablation could be conﬁrmed. In the remaining eight patients, nodular or irregular thick enhancement was shown on the DCE-MRI, viable tumour was conﬁrmed by biopsy in ﬁve patients, the volume of the remains increased 6 months after HIFU ablation. Conclusions: The DCE-MRI characteristics of successfully ablated hysteromyomas included central dark signal intensities with thin rim enhancement, nodular or irregular thick enhancements should raise concern of partial ablation.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Magnetic resonance imaging for the diagnosis of Hirayama disease]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.008</link>
<description><![CDATA[Objective: To investigate the MRI characteristic of the spinal cord in neutral position and fully flexed position of the neck, and to analyze diagnostic value of the subdural space in fully ﬂexed position. Materials and Methods: MRI examinations in neutral neck position and a fully ﬂexed neck position were performed in 9 cases of Hirayama disease and 10 normal control subjects. The MRI features of Hirayama were analyzed and the subdural spaces in the fully flexed position were measured in the patients and control groups. Results: In the neutral position, the cervical curvature become straighten lower cervical cord become atrophy and ﬂattening for the patient group. In a fully ﬂexed position, the patient group showed forward displacement and ﬂattening of the lower cervical cord. There was a crescent-shaped abnormal signal in the subdural space and showed significant enhancement after contrast medium administration. The subdural space between the patients (6.8±0.5) mm and control (4.2±0.4) mm respectively and showed significant difference (P<0.01). Conclusions: The subdural space, which was broadened and seen abnormal signals in a fully ﬂexed position, have a certain value combined with neutral and fully ﬂexed position MR features in the diagnosis of Hirayama.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparison of perfusion imaging and microvessel density in rabbit models of hepatic VX2 tumors after high intensity focused ultrasound]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.009</link>
<description><![CDATA[Objective: Compare perfusion-weighted imaging (PWI) characteristics and parameters changes with before and after high intensity focused ultrasound (HIFU), supposed to discuss the correlation of Maximal signal reduction slope (SRSmax) and microvessel density (MVD). Materials and Methods: Forty rabbit models of hepatic VX2 tumors were implated successfully, two weeks later, after routine scans were performed on 1.5 T MR scanner, using EPI-SE series, 40 New Zealand white rabbits with VX2 carcinoma were divided randomly into treatment group 20, control group 20, HIFU with treatment group. Perfusion-weighted imaging and enhanced scan were performed 14 d  before and after HIFU with both groups. Select the region of interest (ROI) of the central of tumor, surrounding of tumor and paratumor parenchyma. SRSmax of the signal intensity versus time curves were created as quantitative variable. Analyze the SRSmax change degrees and regularities of different ROI. specimens of MVD were examined and compared with PWI. Results: Forty-eight lesions were detected in 40 rabbit models, and 36 lesions in 33 rabbit models were statistical analysis ﬁnally. Tumor showed heterogeneous were mixed with high signal, normal signal and low signal, the degrees and intensity of blood perfusion in different ROI were different. After HIFU, the SRSmax value of central and surrounding of tumor were statistically decreased than that before HIFU (P<0.05). In control group, the SRSmax value of central of tumor with second were statistically decreased than the first (P<0.05). The SRSmax value of surrounding of tumor in HIFU group were statistically decreased than that of control group (P<0.05). The SRSmax and MVD correlation analysis showed that they were positively correlated with surrounding of tumor in HIFU group (r=0.78, P=0.01). Conclusions: The degrees of blood perfusion of different ROI were consistented with the results of MVD. PWI on VX2 carcinomas are matched with the levels and scopes of necrosis, PWI can be used in evaluating the liver tumor angiogenesis and angioruin with the treatment of HIFU.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Research and realization of correction method of MRI motion artifact]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.010</link>
<description><![CDATA[During the process of magnetic resonance imaging, the patient motion induces motion artifacts in the reconstructed image and degrades the quality of the image. In this paper, we study the phase recovery algorithm based on minimum entropy focus criterion constraint. In order to save time and improve the correction effect, we reduce the k-space line numbers and change the original single step correction mode by automatically reducing the step in each iteration. The motion artifacts correction program is developed under the graphic user interface in Matlab environment. It shows the results of simulation and imaging experiment, which provides a reference for the development of new methods.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Dixon sequence: liver MRI and syngo.via layouts]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.011</link>
<description><![CDATA[This article illustrates the benefit of the Dixon T1 sequence in liver MRI and to emphasize the specific “Dynamic” layouts of syngo. Via to display the results of liver scanning. T1 Dixon images are an essential part of liver examinations, allowing immediate recognition of intra-tumoral macroscopic fat or intracellular lipid using a specific 4D syngo.via layout.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Cardiovascular magnetic resonance imaging: Part I——The basic physics and imaging strategies of magnetic resonance]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.013</link>
<description><![CDATA[Magnetic resonance (MR) imaging has been widely used in clinical routine, especially in cardiovascular disease diagnosis, due to its prominent advantage.Cardiovascular magnetic resonance (CMR) can evaluate the anatomy, function,myocardial perfusion and characterization of heart non-invasively in one-stop. Cardiac and respiratory motion is major problem in CMR imaging. It makes CMR imaging be more challenging than any other imaging modality. As the performance of MR hardware and software system uptakes,especially for the substantial increasing of the strength of magnet, the imaging technique is improved persistently. The authors try their best to describe the fundamental physics and key technological points of MR,especially CMR in four successive articles. In first article, the physics of MR and progress of MR image generating were summarized.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[The imaging diagnosis of rectoanal lesions]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.014</link>
<description><![CDATA[The rectoanal anatomical structure is complex and prone to a variety of abnormal morphology and functional disorders. X-ray, CT and MRI in the diagnosis of anorectal lesions have great value, especially MRI of multi-sequence, multi-faceted and high resolution of soft tissue characteristics take an important role in the diagnosis of anorectal lesions.This paper discusses the diagnostic characteristics of the different imaging studies of anorectal disease, and to provide further information for clinical diagnosis and operative procedures.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Advance of cerebral magnetic resonance angiography at 3.0 T]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.015</link>
<description><![CDATA[This review focused on the clinical use and recent advance of Magnetic resonance angiography in cerebral artery stenosis, cerebral aneurysm, arteriovenous malformation, and cerebral venous occlusion disease.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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<title><![CDATA[Compressed sensing technology and its application in MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2013.04.016</link>
<description><![CDATA[Compressed sensing is an innovative theory of signal acquisition and processing based on the areas of applied mathematics. It works by using the mathematical algorithm to make an appropriate domain transformation for the collected signals and changing them into sparse or compressible signals. Afterwards, gathering the compressed signals directly to reconstruct the original signals at speedy, high quality by the method of the reconstruction algorithm. Due to its excellent temporal resolution advantages and with satisfactory temporal resolution, compressed sensing has become a research focus in the field of medical imaging. This article mainly elaborates in the basic theory of compressed sensing, its application in MRI and prospects for development.]]></description>
<pubDate>Sat,20 Apr 2013 00:00:00  GMT</pubDate>
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