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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=201901</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[A diffusion kurtosis imaging study of early injury on the white matter of the bilateral temporal lobes and the hippocampus after radiotherapy in nasopharyngeal carcinoma patients]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.001</link>
<description><![CDATA[Objective: To explore the early microstructure changes on the white matter of the bilateral temporal lobes and the hippocampus after radiotherapy (RT) in nasopharyngeal carcinoma (NPC) patients by using diffusion kurtosis imaging (DKI). Materials and Methods: Twenty-nine NPC patients (NPC group) and 20 normal controls (NC group) were included in this study. The NPC group was followed up prior to the initiation of the treatment and 3 months post-RT. Each participant in NPC group and NC group underwent DKI sequence scanning. Then the DKI parameter figures were obtained and the DKI parameter values in the white matter of the bilateral temporal lobes and the hippocampus were measured. The differences in DKI parameter values between NPC patients prior treatment and NC subjects, between NPC patients prior treatment and 3 months post-RT were analyzed. For NPC group, the correlation between these alternations and Montreal cognitive assessment scale scores, as well as the radiation dosage were also investigated. Results: There were no significant differences in all DKI parameter values between NPC patients prior treatment and NC subjects. Compared with NPC patients prior treatment, the fractional anisotropy (FA) (right: P=0.009. left: P=0.001), mean kurtosis (MK) (right: P=0.027. left: P=0.034) and radial kurtosis (Kr) (right: P=0.007. left P=0.007) values of the white matter of bilateral temporal lobes in the NPC patients 3 months post-RT were significantly reduced. While the MK (P=0.033) and Kr (Kr: P=0.031) values of the right hippocampus in the NPC patients 3 months post-RT were significantly increased. In NPC group, the changes of the MK (r=0.407, P=0.044) and Kr values (r=0.530, P=0.006) in the white matter of the left temporal lobe in the NPC group were significantly correlated with the maximum dose of left temporal lobe. Conclusions: DKI can reflect the early microstructure changes of the white matter of the bilateral temporal lobes and the hippocampus post-RT in NPC patients, which could provide objective imaging evidences for early radiation-induced brain injury of the temporal lobes in NPC patients.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[The value of DWI combined with minimum ADC value in differential diagnosis of intracranial solitary fibrous tumor/hemangiopericytoma and meningioma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.002</link>
<description><![CDATA[Objective: Differential diagnosis of intracranial solitary fibrous tumor/hemangiopericytoma (SFT/HPC) and meningioma by diffusion weighted imaging (DWI) combined with minimum apparent diffusion coefficient (MinADC) to improve preoperative diagnostic accuracy. Materials and Methods: Retrospective analysis of preoperative clinical data, DWI characteristics and pathological data of 10 patients with SFT/HPC (WHO Ⅱ grade) and 22 patients with meningioma (WHO Ⅱ grade) confirmed by surgery and pathology from March 2012 to August 2018. MinADC value of the SFT/HPCs (n=10) was measured on ADC map and was compared with that of meningiomas (n=22). Comparison of MinADC values between SFT/HPC and meningioma was conducted by Welch test. Using the receiver operating characteristic curve (ROC curve) to evaluate the differential diagnosis value of MinADC value. Results: In 10 cases of SFT/HPC, the solid components of the tumor showed equal signal (n=8) and slightly higher signal (n=2) on DWI, the mean value of MinADC was (1.16±0.23)× 10-3 mm2/s. In 22 cases of meningioma, the solid components of the tumor showed slightly higher signal (n=18) and equal signal (n=2) and high signal (n=2) on DWI, the mean value of MinADC was (0.80±0.12)×10-3 mm2/s, less than that of SFT/HPC, the difference of MinADC values between the two groups was statistically significant (P＜0.01). For the differentiation between SFT/HPC and meningioma, the critical cutoff MinADC value was 0.90×10-3 mm2/s, which provided the best combination of sensitivity (97.6%) and specificity (94.3%), the area under the ROC curve was 0.92±0.32, corresponding to histopathological findings, the Kappa value of the repeat measurements was 0.91 for SFT/HPC and 0.87 for meningioma, which indicated a good concordance of the results. Conclusions: MinADC value can be used as a quantitative tool to distinguish intracranial SFT/HPC from meningioma and improve the accuracy of preoperative diagnosis.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparative study of magnetic resonance imaging with 3D-VIBE sequence and STAR-VIBE sequence on pulmonary nodule]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.003</link>
<description><![CDATA[Objective: To explore the application of magnetic resonance imaging with three-dimensional volumetric interpolated breath-hold examination (3D-VIBE) sequence and STAR-VIBE sequence in displaying pulmonary nodules. Materials and Methods: Forty-two patients who were suspected with lung lesions and underwent chest CT and chest MRI were collected. Magnetic resonance imaging with 3D-VIBE sequence and STAR-VIBE sequence were performed using a 3.0 T magnetic resonance scanner. Magnetic resonance images were independently analyzed by two radiologists who owned more than five years working experience with CT images as a reference standard. The detection rates of pulmonary nodules in different MRI sequences were calculated, and the morphological features of pulmonary nodules were evaluated on magnetic resonance imaging using the 4-point scoring criteria. Results: Two hundred and fifty-eight pulmonary nodules were detected on CT images in 42 patients, 243 pulmonary nodules were detected on STAR-VIBE sequence (detection rate 94.2%), while 166 pulmonary nodules were detected on 3D-VIBE sequence (detection rate 64.3%). The detection rate of STAR-VIBE sequence was significantly higher than that of 3D-VIBE sequence, and detection rate increased to 100% for those pulmonary nodules with diameter ≥6 mm on STAR-VIBE sequence. The subjective scores of STAR-VIBE sequence were significantly superior to 3D-VIBE sequence in displaying morphological features of pulmonary nodules (all P＜0.05). Conclusions: Compared with 3D-VIBE sequence, STAR-VIBE sequence not only improves the detection rate of pulmonary nodules, but also provides more information on the morphological features of pulmonary nodules.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Intravoxel incoherent motion diffusion weighted imaging as an imaging biomarker to predict the Ki-67 expression in non-small cell lung cancer patients]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.004</link>
<description><![CDATA[Objective: To evaluate the capacity of noninvasive intravoxel incoherent motion diffusion weighted imaging (IVIM) parameters (perfusion fraction (f), pseudo diffusion coefficient (D*), true diffusion coefficient (D) and apparent diffusion coefficient (ADC) value in preoperative predicting the Ki-67 expression in non-small cell lung cancer. Materials and Methods: The institutional review board approved this study, and written informed consent was obtained from each patient. The IVIM (b=0, 50, 100, 150, 200, 400, 600, 800 s/mm2) and diffusion weighted imaging (DWI, b=50, 800 s/mm2) were used to examine 60 patients (41 males, 19 females, 35—81 years old) with a 3.0 T scanner. All patients had received a histopathologic diagnosis of lung cancer based on bronchoscopy, percutaneous needle-guided, or surgical biopsies, all of them had undergone immunohistochemistry staining. ADC, D, f and D* were generated by using a prototype software body diffusion toolbox, two radiologists drew the region of interest on the parametric maps. The areas of focal necrosis, large vessels, and prominent artifacts were avoided carefully. Each lesion was measured for three times. The correlation between ADC, D, D*, f value and Ki-67 expression is calculated by Spearman correlation. Results: The ADC and D value of non-small cell lung cancer was negatively correlated with the Ki-67 expression (ADC value: r=-0.335, P=0.009)(D: r=-0.330, P=0.01). The ADC value of lung adenocarcinoma was negatively correlated with the Ki-67 expression (r=-0.424, P=0.008). Conclusions: The ADC and D value would be an imaging biomarker for the prediction of tumor aggressiveness indicators such as Ki-67 in non-small cell lung cancer.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Value of imaging examination in differential diagnosis of benign and malignant scalp space-occupying lesions]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.005</link>
<description><![CDATA[Objective: To analyze the imaging and clinical features of scalp space-occupying lesions and to improve the diagnosis and differential diagnosis of scalp space-occupying lesions. Materials and Methods: Two hundred and ninety-four cases of scalp occupying lesions confirmed by pathology and having imaging data in the past five years were collected, which were observed its imaging and clinical manifestations, and the imaging and clinical features of scalp occupying lesions were verified and analyzed by statistical methods. Then analyzed the advantages and disadvantages of different imaging methods. Results: A total of 272 benign cases and 22 malignant cases were collected in this study. The mean age was (23.8±24.8) years (range 0—82 years). The scalp occupying lesions occurred in the parietal and occipital area (62.8%), with a single incidence (95.6%), there was no difference in the sex of the lesions. Most of the benign scalp occupying single (97.1%), regular shape (98.5%), small volume (＜234 mm2), less adjacent skull destruction (94.1%) and intracranial invasion (99.6%); malignant scalp occupying multiple (18.2%), irregular shape (22.7%), large volume (＞234 mm2), prone to adjacent skull destruction (27.3%) and intracranial invasion (13.6%). The incidence of benign and malignant lesions was significantly different (P＜0.05). There was no significant difference in the density, signal, and whether there were separation, necrosis, calcification, and fat components of the lesions in the scalp occupying lesions (P＞0.05). In the groups of cases, 84 cases were examined by ultrasound, 171 cases were examined by CT and 80 cases were examined by MRI, the diagnosis rate was 67.9%, 85.4%, 91.3%, respectively. Twenty-three cases were examined by enhanced scanning, the diagnosis rate was 82.6%. Conclusions: Scalp occupying lesions have relatively characteristic imaging and clinical manifestations. Enhanced MR examination has high diagnostic value and high diagnostic specificity for lesions. It is an important method to distinguish between scalp and malignant occupying lesions.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Diagnostic value of MRI in non-lactation mastitis lesions]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.006</link>
<description><![CDATA[Objective: To investigate the value of magnetic resonance imaging (MRI) in the diagnosis of non-lactation mastitis lesions. Materials and Methods: To retrospective analysis of 83 cases of non-lactation mastitis lesions confirmed by surgery and biopsy pathology with complete MRI data, the lesion morphology, signal intensity, apparent diffusion coefficient (ADC) value, enhancement characteristics and time intensity curve (TIC) types were evaluated and measured respectively. Results: Fifty-four cases showed masses, including single focus (29/54, 53.7%) and multiple foci (25/54, 46.3%). The shape was mainly irregular (27/54, 50.0%). The margin was mainly irregular (27/54, 50.0%) or clear (21/54, 38.9%). The enhancement scan showed heterogeneous (27/54, 50.0%) or rim enhancement (27/54, 50.0%) respectively. Twenty-nine cases showed non-mass enhancement (NME). Segmental distribution was the main type (16/29, 55.2%). The internal enhancement pattern was mainly heterogeneous (20/29, 69.0%). T2 weighted image/iteration decomposition of water with echo asymmetry and least-squares estimation (T2WI/IDEAL WATER) sequence showed middle (31/83, 37.3%) or slightly high signal intensity (31/83, 37.3%). Diffusion weighted imaging (DWI) sequence was mainly slightly high (33/83, 39.8%) and high signal intensity (46/83, 55.4%). The average value of ADC was (1.15±0.30)×10-3 mm2/s. TIC was mainly plateau type (52/83, 62.7%). The lesions were complicated by cystic degeneration and necrosis (54/83, 65.1%), peripheral edema (35/83, 42.2%) and hemorrhage (9/83, 10.8%). Accompanying signs included adjacent abnormal skin changes (30/83, 36.1%), abnormal chest wall change (11/83, 13.3%) and axillary lymph node enlargement at the same side (23/83, 27.7%). Conclusions: Non-lactation mastitis lesions have some characteristics on magnetic resonance imaging, which is of great value in differential diagnosis with breast cancer.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of the magnetic resonance kurtosis imaging on human kidneys]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.007</link>
<description><![CDATA[Objective: To investigate the feasibility of magnetic resonance diffusion kurtosis imaging (DKI) applies on human kidneys. Materials and Methods: Thirty healthy male volunteers were recruited in our hospital from March 2016 to February 2017. The MR examination was performed in the coronal plane with a 3.0 T MR scanner. The scanning sequences included T1WI, T2WI and DKI. The DKI sequence used three different b values (0, 500 s/mm2, 1000 s/mm2) and 30 diffusion-sensitive gradient directions. The paired-samples t test was used to compare the DKI parameters of the renal cortex and medulla. The correlated between all parameters with estimated glomerular filtration rate (eGFR) were calculated. Results: The mean kurtosis (MK), axial kurtosis (Ka) and radial kurtosis (Kr) values in renal cortex were greater than those in renal medulla (P＜0.05). The fractional anisotropy (FA) and axial diffusion (Da) values of renal cortex were significantly lower than those of renal medulla (P＜0.05), while the mean diffusion (MD) and radial diffusion (Dr) values of renal cortex were greater than those of renal medulla (P＜0.05). Conclusions: DKI is feasible in human kidney. It can reflect the water molecule diffusion differences between the renal cortex and medulla. Furthermore, its unique kurtosis parameters can also provide microstructure information on renal cortex and medulla.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Analysis of magnetic resonance imaging findings and clinicopathologic features of sacral Schwannoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.008</link>
<description><![CDATA[Objective: To assess the invasive feature and characteristic MRI manefistations of sacral schwannoma. Materials and Methods: The maximal dimension of tumoral mass (MDTS) was measured in the 26 patients with sacral schwannoma, who were typed and grouped based on tumoral site and invasive extent, presences of tumoral cystic degeneration and “pod-like margin” sign. The difference s of MDTS between types and between groups were compared. The signal appearances on T2-weighted image and post-contrast enhancement pattern were observed of the tumoral parenchyma, and correlated to histologic findings of HE stain. Results: The 26 patients included 4 cases of type 1, 5 of type 2, 10 of type 3, and 7 of type 4. The incidence of pre-sacral soft tissue mass surpassed that of post-laminal region (χ2=13.066, P=0.011). Osteolysis was revealed in midline sacrum in 5 patients and in para-midline sacrum in 14 patients. The MDTS of type 3 was larger than that of rest types (t=2.655, P=0.014). The MDTS of 8 cases of GISS exceeded that of 18 cases of non-GISS (t=-3.027, P=0.006). No significant difference was shown between the 12 patients with "pod-like margin" sign and the 14 patients without the sign (t=1.896, P=0.07). Both MDTS and duration in 12 patients with cystic degeneration exceeded those in 14 with no cystic degeneration (t=2.928, P=0.007. t=-2.187, P=0.039. Respectively). Region Ⅰ was demonstrated with mild hyperintensity on T2-weighted image, marked enhancement and correlated to the area of Atoni A, while region Ⅱ was noted with hyperintensity on T2-weighted image, mild or no enhancement and correlated to the area of Atoni B. Conclusions: Sacral schwannoma possesses the features of eccentric osteolysis and pre-sacral infiltration. The mild and marked hyperintensities on T2-weighted image, and the intrinsic post-contrast enhancement discrepancy comprise the characteristics of MRI appearances of this tumor.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[A joint assessment in myocardial ischemia by cardiac magnetic resonance and biomarkers]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.009</link>
<description><![CDATA[Objective: The purpose of this study is to investigate the clinical value of cardiac magnetic resonance (CMR) and biomarkers in evaluating myocardial ischemia. Materials and Methods: Seven pigs of myocardial ischemia modol were successfully established, CMR and biomarkers checks were performed pre-surgery and post-surgery at 2 h, 12 h, 24 h, 48 h, 72 h, 1 w, 2 w, 3 w, 4 w, respectively. And pathologic histology was given at last. Results: Bama-pigs' cardiac troponin I and myoglobin levels significantly increased in 2 h compared with the baseline results [(0.005±0.002) ng/ml vs. (0.338±0.768) ng/ml, (110.3±53.7) ng/ml vs. (1012±1300) ng/ml, P＜0.05, respectively], all the markers for the extent of the myocardial injury increased in 72 h after modeling (all P＜0.05), which indicated myocardial injury, and gradually to be stable after 1 week post-surgery. At the early stage of ischemia, T2 weighted imaging (T2WI) CMR showed the myocardial edema, which was also called area at risk. Cine showed the abnormal wall motion. First-pass perfusion imaging showed the hypoperfusion or perfusion defect at 2 h, delayed enhancement CMR showed the high signal at 24 h, and transmural extent increased with the prolongation of ischemic time, which were confirmed by pathological findings of necrotic myocardium and myocardial fibrosis at last. Cardiac function measured by CMR dropped significantly 4 w after modeling (left ventricular ejection fraction%: 62.71±8.33 vs. 45.97±6.37, P＜0.05). Conclusions: Myocardial enzyme spectrum, cardiac troponin I and myoglobin can indicate the myocardial injury, CMR can exactly reveal micro-histological changes of myocardial ischemia, joint assessment is of great significance in providing detailed prognosis information and guiding treatment options.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Applications of magnetic resonance imaging in adult patients with hemorrhage moyamoya disease]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.011</link>
<description><![CDATA[Cerebral angiography is still the gold standard for the diagnosis of moyamoya disease (MMD), however, it isn’t suitable for patients that is necessary for screen and follow up because of an invasive and expensive way. CT angiography (CTA) is considered essential for the diagnosis, but it is harmful for the body. Ultrasound is less meaning for the exam of MMD. With the advanced development of magnetic resonance imaging, the way of morphological examination is helpful for localizing ischemic and hemorrhagic lesions in the brain parenchyma and identifying stenotic lesions in the ends of the carotid artery. And the functional method is indispensable for evaluating cerebral hemodynamics of the patients with MMD. Moreover, MRI is a multi-contrast and multi-modality method to diagnose MMD, it’s also a non-invasive and safe way. Here, we review the progress of MRI in terms of diagnosis and assessment in adult patients with hemorrhage MMD in order to provide a significant clinical reference for diagnosis and operation.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Study progress in magnetic resonance imaging and analysis methods in hemifacial spasm]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.012</link>
<description><![CDATA[Hemifacial spasm is a movement disorder characterized by involuntary contraction of unilateral facial muscles, usually starting with the orbicularis oculi muscle and progressing to the whole face. The vascular compression on the root exit zone of facial nerve is the most common cause of primary HFS. And the pathophysiological mechanism of the HFS may be the hyper excitability of the motor nucleus caused by the compression of the facial nerve, so it is particularly important to recognize the position between the facial nerve and offending vessels. Many new magnetic resonance imaging techniques have been applied to the identification and diagnosis of hemifacial spasm recently. The latest progresses in the field of magnetic resonance morphological imaging, resting-state functional magnetic resonance imaging (rs-fMRI), the voxel-based morphometry (VBM) and diffusion tensor imaging (DTI) were reviewed in this article.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Quantitative analysis of MRI parameters for small hepatocellular carcinoma in the background of cirrhosis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.013</link>
<description><![CDATA[Hepatocellular carcinoma (HCC) is the main cause of death in patients with chronic hepatitis cirrhosis. Its early symptoms are atypical, the detection rate is low, and the mortality rate is high. Early diagnosis and treatment of cancerous nodules or small hepatocellular cancer (SHCC) are the most direct and important ways to improve the curative effect of HCC. In recent years, MRI technology has developed rapidly, including dynamic contrast enhanced MRI (DCE-MRI), intravoxel incoherent motion imaging (IVIM), diffusion kurtosis imaging (DKI), T1 mapping, LiverLab and other technologies. A series of pathophysiological and hemodynamic changes in the carcinogenesis of hepatic nodules were analyzed, which significantly increased the detection rate of SHCC. In this paper, correlation research about MRI quantitative parameters analysis of small hepatocellular cancer in the background of cirrhosis will be reviewed.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Research advances of DWI in prostate cancer diagnosis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.014</link>
<description><![CDATA[Diffusion weighted imaging (DWI) can detect the degree of water molecules diffusion noninvasively, playing an important role in the diagnosis of prostate cancer. In recent years, the development of several mathematical models, including conventional mono-exponential DWI, diffusion tensor imaging (DTI), diffusion kurtosis imaging (DKI) and intravoxel incoherent motion (IVIM) model, is likely to enhance the value of DWI in prostate cancer. This article introduces these mathematical models briefly and reviews their research advances in the detection, diagnosis, differential diagnosis and aggressiveness assessment of prostate cancer.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of MRI in diagnosis of lumbar spinal stenosis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2019.01.015</link>
<description><![CDATA[Currently, lumbar spinal stenosis is mainly diagnosed by imaging, espacially  magnetic resonance imaging (MRI), which has become an important method due to its unique advantages. MRI shows the spinal canal stenosis with the transverse, sagittal and coronal surfaces intuitively. For the central spinal stenosis, some morphological manifestations of MR, such as nerve root sedimentation sign and redundant nerve roots can quantitatively or qualitatively determine the degree of spinal stenosis to help determine whether there are surgical indications. Diffusion tensor imaging based on the diffusion anisotropy of water molecules, makes a vector diagram or color coding to show the nerve fiber bundle imaging. By observing the nerve fiber bundle anomaly can quantitatively evaluate the degree of foraminal stenosis. Therefore, MRI has obvious advantages in diagnosis of lumbar spinal stenosis.]]></description>
<pubDate>Sun,20 Jan 2019 00:00:00  GMT</pubDate>
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