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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=201711</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[Cerebral perfusion varieties using 3D pseudo-continuous arterial spin labeling with different PLD in patients with unilateral middle cerebral artery stenosis or occlusion]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.001</link>
<description><![CDATA[Objective: To assess the differences of different postlabeling delay (PLD) state of cerebral blood perfusion and clinical value. Materials and Methods: Patients with unilateral middle cerebral artery stenosis or occlusion were collected (n=30), who underwent MRI, three-dimensional time of flight magnetic resonance angiography (3D-TOF-MRA), diffusion weighted imaging (DWI) and three-dimensional pulsed continuous arterial spin labeling (3D pCASL) (PLD=1.5 s, PLD=2.5 s) scanning. All patients were divided into DWI (+) and DWI (-) according to ADC value. Cerebral blood flow (CBF) values (CBF1.5, CBF2.5)  and ADC values of lesions in DWI (+) and MCA territory in responsible side in DWI (-) were measured by two observers, the relative areas of low perfusion and high DWI signal region were further calculated and NIHSS scores were recorded (n=16). ICC was used to assess the consistency between the two measurers; the difference of low perfusion detection rate was analyzed by Chi-square test, the differences of CBF values between two groups were analyzed by independent sample t test, the differences of CBF values in a group and then the relative areas were analyzed by paired sample t test. Pearson and Spearman correlation analysis were used to analyze the correlation between CBF values vs. ADC values and NIHSS scores. Results: The good consistency was acquired between the two measurers (ICC=0.98, P＜0.05). CBF1.5 values were lower than those of CBF2.5 in all patients or DWI (+) or DWI (-) (t=-7.207, P=0.000. t=-7.071, P=0.000. t=-3.641, P=0.004). Compared with DWI (-), CBF1.5 values and CBF2.5 values and ADC values of DWI (+) were decreased (t=-8.243, P=0.000. t=-5.536, P=0.000, t=-10.764, P=0.000). The detection rate of low perfusion was higher and the relative area value of low perfusion was larger with PLD=1.5 s than 2.5 s (χ2=7.239, P=0.007. 0.59±0.11, 0.21±0.09, t=4.20, P=0.006). The relative areas of high signal was 0.12±0.05 in DWI (+), which was lower than those of low perfusion with PLD= 1.5 s, but not differed to those with PLD=2.5 s (t=4.622, P=0.001. t=2.282, P=0.71). There was moderate positive correlation between CBF2.5 values and ADC values in DWI (+) group, moreover there was a moderate negative correlation between CBF1.5 values and NIHSS scores (r=0.50, P=0.035. r=-0.547, P=0.028). Conclusions: PLD of 1.5 s is sensitive to hypoperfusion and shows large ischemic area, which is in good consistency with clinical status. The combined application of PLD of 2.5 s and 1.5 s is better to assess collateral circulation.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Value of 3D ASL in evaluation cerebral hemodynamics before and after thrombolytic therapy in acute cerebral infarction]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.002</link>
<description><![CDATA[Objective: To evaluate the value of 3D whole-brain pseudo-continuous arterial spin labeling imaging (3D ASL) in evaluationg the thrombolytic therapy in patients with acute cerebral infarction. Materials and Methods: Conventional plain MRI, diffusion weighted imaging (DWI) and 3D ASL were performed on 20 patients with acute cerebral infarction within 10 hours after onset of symptom. All patients were reexamined cerebral plain MRI, DWI and 3D ASL after thrombolysis between 1—7 day. Cerebral blood flow (CBF) of infarction area and normal control area was carried out on 3D ASL images before and after thrombolytic therapy. Results: All 20 cases showed early infaction signs on DWI with ADC decreased and hypoperfusion on 3D ASL with CBF decreased corresponding to clinical symptoms. The abnormal area was larger on 3D ASL than DWI. Follow-up 3D ASL showed that after thrombolysis 18 cases with samller hypoperfusion, 2 cases with larger hypoperfusion and 10 cases with hyperferfusion. There was statisticaly significant difference between the CBF on ischemic region before and after thrombolysis (P＜0.05). Conclusions: As a new noninvasive perfusion imaging technique, 3D ASL can depict detailed hemodynamic information before and afer thrombolysis, and provide important basis for evaluating the effect of thrombolytic therapy in patients with acute cerebral infarction.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Diagnostic value of DWI on brain anaplastic ependymoma with glioblastoma multiforme]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.003</link>
<description><![CDATA[Objective: To compare imaging features of the brain anaplastic ependymoma and glioblastoma multiforme (GBM), exploring the value of diffusion weighted imaging (DWI) and apparent diffusion coefficient (ADC) value in differential diagnosis of them. Materials and Methods: Collect the essence of 18 cases with brain surgery and pathology room brain anaplastic ependymoma and 25 cases of GBM patients with preoperative MR scan, enhanced scan and DWI imaging examination data, analyzed the MRI images, and measure the two groups of tumor of the average ADC value for Mann-Whitney U rank test, using receiver operating characteristic (ROC) curve to evaluate the differential diagnostic value of ADC value. Results: Twenty-five cases of GBM DWI in 19 cases showed high or slightly high signal, 6 cases showed low signal, the mean value of ADC was (0.83±0.06)×10-3 mm2/s. Eighteen cases of brain anaplastic ependymomain 14 cases of DWI showed high or slightly high signal, 4 cases showed low signal, the average ADC (1.15±0.12)× 10-3 mm2/s. The difference was statistically significant higher than that of GBM (t=9.43, P＜0.001). With the ADC value of 0.96×10-3 mm2/s as the diagnostic threshold, the area under the ROC curve is equal to 0.92±0.04, the 95% confidence interval is 0.84 to 1, sensitivity is 90%, specificity is 95%, accuracy is 90%. Conclusions: There are some differences between the MRI signs of brain anaplastic ependymoma and GBM, ADC value has important reference value in the differential diagnosis, can improve the diagnostic accuracy.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of susceptibility weighted imaging in the identification of necrotic glioblastomas and brain abscesses]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.004</link>
<description><![CDATA[Objective: To investigate the value of susceptibility weighted imaging (SWI) in differentiating the necrotic glioblastomas and brain abscesses. Materials and Methods: Twenty-three patients with necrotic glioblastomas and 16 patients with brain abscesses were retrospectively analyzed. All patients underwent conventional MRI and SWI on a 3.0 T MR unit. To evaluate the value of SWI in differentiating the necrotic glioblastomas and brain abscesses by detecting the intralesional susceptibility signal (ILSS). Results: Twenty-two (95.7%) of 23 patients with necrotic glioblastomas were detected with ILSS. Six (37.5%) of 16 patients with brain abscesses were detected with ILSS. The sensitivity of ILSS in differentiating necrotic glioblastomas and brain abscesses patients was 96% and the specificity was 63%. The detection rate of ILSS in patients with necrotic glioblastomas was higher than that in patients with brain abscesses (OR=36.67, P=0.002). Conclusion: SWI has great value in differentiating the necrotic glioblastomas and brain abscesses.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Differentially diagnostic value of ADC values in diagnosing homogeneous benign and malignancy of thyroid nodules]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.005</link>
<description><![CDATA[Objective: To investigate the differential diagnostic value of apparent diffusion coefficient (ADC) in diffuse weighted imaging (DWI) in the diagnosis of minimally invasive thyroid nodules and to improve the homogeneous thyroid nodules of the differential diagnosis of imaging. Materials and Methods: Select 162 cases confirmed by surgery pathology in the second hospital of Hebei medical university homogeneous patients with thyroid nodules, a total of 226 lesions on magnetic resonance scan and conventional DWI examination used the proceeds of all lesions imaging data for statistical analysis. Results: Homogeneous thyroid nodule in DWI examination, setting different b factors of ADC values obtained ADC values were different. Take b factor of 300, 500 and 800 s/mm2, the difference of ADC values obtained from DWI scan between benign and malignant nodules was statistically significant (P＜0.05). Take b factor of 0 and 1000 s/mm2, the difference of ADC values obtained from DWI scan between benign and malignant nodules was not statistically significant (P＞0.05). Conclusions: ADC value is of significance to the differential diagnosis of homogeneous thyroid nodules.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of dynamic contrast enhancement and diffusion weighted imaging in diagnosis and prediction of breast cancer recurrence]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.006</link>
<description><![CDATA[Objective: Assess the value of MRI dynamic contrast enhancement (DCE-MRI) and diffusion-weighted imaging (DWI) in diagnosing and predicting early and late breast cancer recurrence. Materials and methods: There were 78 breast cancer patients in Hebei general hospital were examed by DCE-MRI and DWI scan,between January 2011 and June 2014. All of these patients were examed by breast mammography or ultrasound before our exam and had been confirmed by pathology. We compared the early recurrence after surgery (2 years) or less and late recurrence [(＞2 years) after the surgery] in patients with MRI characteristics [including: background parenchymal enhancement (BPE), mass of substantial enhancement patterns, the vascular distribution of the whole breast, dynamic enhancement curve type, apparent diffusion coefficient (ADC) value] and clinical pathological variables. In this paper, Cox proportional hazard regression analysis was performed to evaluate independent risk factors for early and late recurrence. Results: In the MRI examination of breast cancer, the distribution of total breast blood vessels was significantly correlated with the early recurrence. Moderate or obvious BPE  and rim enhancement, which is associated with late recurrence. In the diffusion weighted imaging, the proportion of ADC values ＜1.20×10-3 mm2/s were significantly higher in the early recurrence cases than in the later recurrence (P＜0.05). The clinical pathological variables associated with early recurrence were estrogen receptor (ER) negative (HR was 0.45, 95% confidence interval was 0.26—0.93). Conclusions: In DCE-MRI, prominent ipsilateral whole-breast vascularity, moderate or marked BPE, and rim enhancement could be useful for predicting recurrence timing in patients with breast cancer. MRI dynamic contrast enhancement examination and dynamic enhancement curve type and the value of ADC can effectively diagnose and predict the recurrence of breast cancer patients.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The clinical study on the Gd-EOB-DTPA-enhanced MR imaging for analysis of liver function and comparison with serologic results]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.007</link>
<description><![CDATA[Objective: To investigate the clinical significance of Gd-EOB-DTPA to predict and evaluate the liver function. Materials and Methods: Gd-EOB-DTPA-enhanced MR images of 98 patients were conducted on a 3.0 Tesla MRI. The values of relative enhancement ratio (rER) and Child-Pugh scores were calculated. Serologic testing was obtained within 7 days before and after MRI. The comparison between different Child-Pugh groups was accomplished by One-Way ANOVA. Spearman rank correlation was applied to analyze the relationship between the rER values and serologic results. Results: The results showed statistical differences among rER values of different Child-Pugh groups and normal group (P＜0.05). The mean values are respectively 2.281±0.275, 2.092±0.474, 1.824±0.246, 1.711±0.433. Comparative analysis between every two groups was applied and the results showed that normal and Child-Pugh B, normal and Child-Pugh C, Child-Pugh A and Child-Pugh B indicated statistical significance. The linear regression analysis showed that P value between rERs and values of TBIL, ALT, AST, PT, PTA, PA, ChE were less than 0.05, which was significant statistically. Conclusions: The rER values of EOB-MRI could be used to evaluate liver function and to identify mild, moderate liver damage significantly. It got the most intimate relation with prothrombin activity and prealbumin.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Clinical application of small field-of-view T2WI in rectal carcinoma T staging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.008</link>
<description><![CDATA[Objective: To investigate the value of small field-of-view T2 weighted imaging in rectal carcinoma T staging and the correlation between tumor volume and T staging. Materials and methods: Ninety cases with rectal carcinoma confirmed by colonoscopy underwent MRI scanning, including conventional T2 weighted imaging and small field-of-view, thin-section T2 weighted imaging. Two radiologists analyzed T staging at the same time, and drew the outline of tumor boundary, in order to acquire tumor size of each layer and to calculate tumor volume. Consistency between T staging by small field-of-view T2WI and pathological method was compared, and the correlation between tumor volume by small field-of-view T2WI and pathological T staging was analyzed. Results: Small field of view T2 weighted imaging for T stage was highly consistent with pathological stage (Kappa=0.771). The diagnostic accuracy in predicting T stage was 84.44%. The accuracy, sensitivity and specificity for tumor of T1 stage were 96.67%, 80.00%, 97.65%, respectively. The accuracy, sensitivity and specificity for tumor of T2 stage were 88.89%, 80.00%, 92.31%, respectively. The accuracy, sensitivity and specificity for tumor of T3 stage were 86.67%, 82.05%, 90.20%, respectively. the accuracy, sensitivity and specificity for tumor of T4a stage were 96.67%, 95.24%, 97.10%, respectively. Moderate correlation in tumor volume was detected between MRI measurement and pathological T staging (r=0.657, P＜0.05). Conclusions: Small field-of-view T2WI has relatively high application value in rectal carcinoma T staging, as well as in the tumor T staging evaluation before surgery and the selection of therapeutic schedule.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The causes and solutions of Swap artifacts occurring in  neck DIXON sequence scanning]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.009</link>
<description><![CDATA[Objective: To explore the causes and solutions of Swap artifacts in neck DIXON sequence scanning. Materials and Methods: A retrospective analysis of 947 patients with DIXON sequence scan of the neck, classified the 137 samples with Swap artifacts by region, measured the SNR of image, used average=2, disusing parallel acquisition technique, changing the phase encoding methods to divide 133 Axial samples into 45, 45, 43 three groups, analyzed the results with χ2 test, P＜0.05 was considered to have a statisticsdifferences. Results: (1) Swap artifacts mostly occurred in paranasalsinus, mandible, thyroid and skin surface. (2) The probability of occurrence of Swap artifacts with high signal-to-noise ratio (SNR) is lower than that with low SNR. (3) The probability of removal of Swap artifacts were 93.3% (42/45), 91.1% (41/45) and 53.5% (23/43), respectively. The P value of group 1/2 is 0.693, it reveals no statistically significant difference, while the P values of group 1/3 and group 2/3 are less than 0.01, and they all show a significant difference. Conclusions: The probability of occurrence of Swap artifacts is related to the homogeneity of magnetic field and the SNR of the image. The magnetic field homogeneity is high and the probability of artifacts is low. The SNR of images is high and the probability of artifacts is low. In practice, the method of increasing the SNR is superior to the method of improving the homogeneity of the magnetic field.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Analysis of magnetic resonance imaging findings and clinicopathologic features of sacrococcygeal chordoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.010</link>
<description><![CDATA[Objective: To assess the conventional MRI and dynamic contrast-enhanced MRI (DCE-MRI) features of sacrococcygeal chordoma and their pathological basis. Materials and Methods: The appearances of both conventional MRI and DCE-MRI were observed in 21 patients with sacrococcygeal chordoma as well as the HE-stain pathologic manifestations. The maximal dimension of tumoral mass (MDTS) was measured and the DCE-MRI indexes were acquired of time signal intensity curve (TSIC), wash in rate (WiR), wash out rate (WoR) and time to peak (TTP) in the 21 patients. Results: The tumoral mass was characterized by the hyper-intensity on T2-weighted images. The MDTS of 18 patients with positive "pod-like margin" sign were larger than those of the 3 patients with negative one (t=2.800, P=0.011). The gradual and sustained enhancement occurred during the post-contrast 30 minutes in the chordoma mass with TSIC of slow-rising type, WiR at 0.75±0.05, WoR at 0, and TTP at 30.00 minutes. Pathologically, the prominent finding was tumoral cell nets rich in vacuolated cells and physaliphores alternating with zones of mucin collection. Conclusion: Sacrococcygeal chordoma possesses the biologic behavior property of vertebral body-centered three-dimensional invasion with a tendency of prevertebral extension, and the "pod-like margin" sign comprises its marginal morphological feature. The characteristic hyper-intensity on T2-weighted image, and the occurrence of gradual and sustained enhancement are closely related to tumoral cells and mucin within tumoral mesenchyma.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Brain structure and resting-state functional MRI study of obstructive sleep apnea-hypopnea syndrome]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.011</link>
<description><![CDATA[Obstructive sleep apnea-hypopnea syndrome (OSAHS) is a sleep respiratory disease induced by a variety of factors. The chronic hypoxia can lead to a decrease in executive function, memory, motor coordination, attention, and cognition. In recent years, some scholars have studied the brain structure and resting state brain function in patients with OSAHS. They found that the brain structure and function in patients with OSAHS have a certain change and these changes in the brain are associated with some cognitive and behavioral decline in the patient. This article will review the changes in brain structure and brain function of OSAHS, and hope to have some assistance in the neuroimaging and clinical diagnosis and treatment of OSAHS.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Research progress of intravoxel incoherent motion in tumor]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.012</link>
<description><![CDATA[Intravoxel incoherent motion (IVIM) is based on diffusional weight imaging (DWI), IVIM relevant parameters are obtained from bi-exponential model, they can represent pure molecular diffusion and incoherent microcirculation within the voxel at the same time in the tissue without the use of contrast agents. In recent years, IVIM gradually applied to diseases of different systems, especially in the cancer of brain and liver had achieved some initial results, which displayed excellent clinical value. This article proposed to summary technical principles and application advances in tumors of IVIM.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Application status of functional magnetic resonance imaging technology in the liver]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.013</link>
<description><![CDATA[In recent years, various functional magnetic resonance imaging technologies have been emerging. Some of them have been applied maturely in clinical practice. However, the potential of many technologies has not yet been discovered. At present, functional magnetic resonance imaging has been studied in many parts of the human body, such as brain, breast, kidney, prostate and so on, and some have shown important clinical value. This paper proposed to summary the application status of common functional magnetic resonance imaging technologies in the liver.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[The recent advance in the assessment of gastric motility by MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.014</link>
<description><![CDATA[With the growing stress at work as well as personal life, the morbidity rate of gastric dynamic disorder for modern people has been increasing annually. The main cause of the disorder is functional dyspepsia, in the meanwhile, detection of gastric motility will facilitate the diagnosis and treatment of functional gastrointestinal diseases. In recent years, with the help of MRI technology development and new computer softwares, we are able to obtain high-resolution images of the gastrointestinal tract by using contract agent. At present, most research is to confirm and to development softwares for image data processing. The research and development of new computer software can overcome motion artifact, improve image quality, and facilitate diagnosis as well. The noninvasion, little ionizing radition, and mutli-planar imaging make the technique suitable for the patients requiring repeative medical check. However, the technique hasn’t been widely applied in gastrointestinal examination and evaluation. This article mainly makes a comparison between gastrointestinal examination and evaluation on the one hand, and focuses on the progress of gastric dynamics assessment with MRI technique.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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<title><![CDATA[Progress of diffusion-tensor imaging in normal and diseased uterus]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2017.11.015</link>
<description><![CDATA[Diffusion tensor imaging (DTI) can reflect microstructure of tissues by quantifying the velocity and direction of water molecules, thus to quantitatively analyze pathological changes noninvasively. When physiological and pathological changes cause DTI change, more functional information will come up than conventional MRI. There are some articles about DTI on uterus, uterine leiomyoma and endometrial cancer, which shows its reliability in physiological and diseased analyze of uterine, thus to help treat and prognose diseases. This article is about progress of DTI in uterus.]]></description>
<pubDate>Mon,20 Nov 2017 00:00:00  GMT</pubDate>
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