<?xml version="1.0" encoding="utf-8" ?>
<rss version="2.0">
<channel>
<title>Chinese Journal of Magnetic Resonance Imaging RSS feed</title>
<link>http://med-sci.cn/cgzcx/en/contents_list.asp?issue=201809</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
<item>
<title><![CDATA[Diagnostic value of cerebrospinal fluid 1H-MRS for mitochondrial encephalopathy]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.001</link>
<description><![CDATA[Objective: To investigate the diagnostic value of cerebrospinal fluid 1H-MRS for mitochondrial encephalopathy and provide new clues and ideas for clinical diagnosis. Materials and Methods: Thirteen patients with mitochondrial encephalopathy (ME) and 17 patients with clinically suspected mitochondrial encephalopathy but ultimately diagnosed with non-mitochondrial disease were selected as control group. All patients underwent routine MRI and 1H-MRS examination. The Lac peak were compared between the two groups of patients respectively. Results: Cerebrospinal fluid 1H-MRS showed that 10 cases (10/13) of the cerebrospinal fluid area showed Lac peaks, 3 cases (3/17) of the control group showed Lac peaks in the cerebrospinal fluid area. 1H-MRS showed 5 cases (5/12) Lac peaks were observed in the lesion area of ME. Elevated Lac peaks were observed in the lesion area of the control group in 6 cases (6/16). The sensitivity, correct index, positive likelihood ratio, negative likelihood ratio, and coincidence rate of lac peak in the diagnosis of mitochondrial encephalopathy in the 1H-MRS in cerebrospinal fluid region were better than those in lesion area. Analysis of 1H-MRS diagnosis of mitochondrial encephalopathy combined with cerebrospinal fluid area and lesion area showed that compared with 1H-MRS results of cerebrospinal fluid alone, the sensitivity of the tandem test was reduced, and the specificity was increased. The correct index and coincidence rate of serial and parallel tests were lower than those in the cerebrospinal fluid region. Conclusions: The appearance of Lac peak in cerebrospinal fluid 1H-MRS is superior to that in brain lesion area, which contributes to the lactate level detection in cerebrospinal fluid.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[ReHo and ALFF studies in the brain of patients with obstructive sleep apnea hypopnea syndrome]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.002</link>
<description><![CDATA[Objective: To investigate the change of brain function in patients with obstructive sleep apnea hypopnea syndrome using regional homogeneity (ReHo) and amplitude of low frequency fluctuation (ALFF). Materials and Methods: Thirty-one patients of OSAHS were recruited from the Affiliated Hospita of Qinghai University and 32 healthy volunteers were recruited. Polysomnography (PSG) and resting state functional magnetic resonance imaging (rs-fMRI) were performed on OSAHS patients and healthy controls.The blood oxygen level dependent (BOLD) signals of OSAHS patients and normal controls were obtained and compared using ReHo and ALFF methods. Results: Compared with the normal group, the OSAHS group has significant differences between ReHo and ALFF. The brain areas with increased ReHo value (P＜0.05) are: right medial and paracentral cingulate gyrus, right dorsolateral upper frontal gyrus, left dorsolateral upper frontal gyrus, right middle frontal gyrus, right medial upper frontal gyrus, left medial upper frontal gyrus, right hippocampus. The brain areas with decreased ReHo value (P＜0.05) are: right lingual gyrus, left middle temporal gyrus, left postcentral gyrus, right inferior temporal gyrus, left precuneus, right middle temporal gyrus, right precuneus, right superior occipital gyrus. The brain areas with increased ALFF value (P＜0.05) are: right dorsolateral upper frontal gyrus, right hippocampus, right insula, right parahippocampal, left hippocampus, right medial and paracentral cingulate gyrus, right middle frontal gyrus. The brain areas with decreased ALFF value (P＜0.05) are: right middle occipital gyrus, right inferior occipital gyrus, left middle occipital gyrus, right lingual, left lingual, left inferior occipital gyrus, left middle temporal gyrus, right superior occipital gyrus. Conclusions: The changes in ReHo and ALFF values in multiple brain regions indicate that OSAHS has a certain degree of influence on the brain function of the multiple brain regions of the patient.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[The clinical application of reduced field-of-view (rFOV) diffusion-weighted imaging (DWI) in pancreatic cancer and pancreatitis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.003</link>
<description><![CDATA[Objective: To explore the clinical value of reduced field-of-view (rFOV) diffusion-weighted imaging (DWI) in pancreatic cancer and pancreatitis. Materials and Methods: A total of 28 pancreatic cancer patients and 21 pancreatitis patients performed conventional full field-of-view (fFOV) and rFOV DWI respectively. Two radiologists assessed image sharpness, distortion, artifacts, lesion conspicuity and overall image quality independently. The objective image quality (IQ) parameters such as contrast-to-noise ratio (CNR), signal-to-noise ratio (SNR) and lesion apparent diffusion coefficient (ADC) were also measured. Quantitative parameters of two different DWI sequences were compared by independent-samples t test. Results: The subjective IQ parameters of rFOV DWI sequence were rated superior to that of fFOV DWI sequence (P＜0.001). CNR and SNR were significantly higher in rFOV DWI than in fFOV DWI (P＜0.001). There was no significant difference between mean ADC values in rFOV and fFOV DWI sequences [Pancreatic cancer, (1.445±0.292)× 10-3 mm2/s vs (1.334±0.235)×10-3 mm2/s, P=0.079; Pancreatitis, (1.448±0.309)× 10-3 mm2/s vs (1.441±0.268)×10-3 mm2/s, P=0.910]. Conclusions: Compared with fFOV DWI, rFOV DWI has a higher spatial resolution and lesion conspicuity. It also can significantly reduce susceptibility artifacts as well as image distortions.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[The value of intravoxel incoherent motion in differentiating hepatic abscess from cystic necrotic malignancy]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.004</link>
<description><![CDATA[Objective: To explore the value of intravoxel incoherent motion (IVIM) including biexponential models and stretched-exponential models in differential diagnosis of hepatic abscess and cystic necrosis hepatic malignant tumor. Materials and Methods: All patients who performed liver scanning on a 1.5 tesla MR system were retrospectively collected (n=36 patients) in our hospital from September 2015 to October 2017. Seventeen of 36 patients were confirmed as hepatic abscess, the others were confirmed as hepatic malignant tumor. The liver MR protocol included DWI and eDWI. The value of ADC and standard ADC of wall and cavity were calculated and compared between two groups. Then the value of Dmono, D*mono, fmono, Dbi, D*bi, fbi, DDC and α of wall were calculated and compared between two groups. The data were performed by student's t-test to contrast parametric values in two groups, which also obeys normal distribution. The other data were performed by Mann-Whitney test to contrast parametric values in two groups. Diagnostic performance was evaluated with the receiver operating characteristic (ROC) curve analysis. Results: The ADC value and standard ADC value of cavity and wall, fmono value and Dbi value of wall, the DDC value of wall kept statistically significant (P＜0.05). The area under the ROC curve of cavity of ADC and standard ADC were respectively 0.897 and 0.764. The area under the ROC curve of wall of ADC and standard ADC were respectively 0.811 and 0.753. The area under the ROC curve of wall of  fmono, Dbi and DDC were respectively 0.789, 0.703 and 0.881. Conclusions: The standard ADC and ADC value of wall and cavity, fmono, Dbi and DDC value of wall have stastically significance and may be helpful for differentiating pyogenic hepatic abscesses and cystic necrotic hepatic malignant tumor.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[Study of DCE-MRI and IVIM-DWI on degenerative intervertebral disc neovascularization in patients with low back pain]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.005</link>
<description><![CDATA[Objective: To evaluate the value of dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) and incoherent motion diffusion-weighted imaging (IVIM-DWI) in the assessment of the neovascularization of the degenerative intervertebral disc in patients with lower back pain. Materials and Methods: Fifty-one patients with lumbar disc herniation treated by lumbar posterior approach were selected as the experimental group. Eight patients with lumbar fractures were selected as the control group. All subjects underwent IVIM and DCE-MRI examinations before operation, DCE parameters Ktrans, Kep, Ve and IVIM parameters D*, D and f were measured respectively. After operation, immunohistochemistry of intervertebral disc were analyzed. The microvessel density (MVD) was calculated by CD34 labeled vascular endothelial cells. The correlation between the parameters of two imaging modalities and microvessel density was analyzed by Pearson correlation. One-way analysis of variance was used to compare differences in IVIM-DWI and DCE-MRI parameters among patients with different degenerative degrees. Results: The Ktrans value increased with the grade of degeneration (P＜0.05). The D value decreased with the grade of degeneration (P＜0.05). Ktrans and f values were well correlated with MVD (r=0.794, 0.589, P＜0.05). Conclusions: DCE-MRI and IVIM-DWI can observe the vascularization of intervertebral disc degeneration non-invasively and repeatedly. They can also assess the degree of intervertebral disc degeneration.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[Research on dynamic functional network of risky decision making]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.006</link>
<description><![CDATA[Objective: This study aims to investigate dynamic network characteristic of risky decision making among adolescents. Materials and Methods: We first obtained rest-state functional magnetic resonance imaging (fMRI) data of 49 subjects; then dynamic functional connectivity networks were constructed using dynamic window for each subject and the fluctuation amplitudes of dynamic functional connectivity were calculated, finally these amplitude values were used as the features of multivariate pattern analysis to predict the risky decision behavior so as to obtain dynamic network characteristic of risky decision making. Results: Spontaneous fluctuation of dynamic functional connectivity could predict the risky decision behavior with good performance (r=0.3612, P=0.0108). Seventeen informational functional connectivities were found with powerful predictive function for risky decision making and they were mainly located among networks. Default network played the most important role for the risky decision behavior among all network modules, then two control network including the cingulo-opercular and frontoparietal network also played important roles. Conclusions: We used dynamic functional connectivity to predict risky decision behavior. What's more, we investigated the dynamic network characteristic of risky decision making.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[The secondary path modeling for fMRI scanning noise active control system]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.007</link>
<description><![CDATA[Objective: An additive gaussian white noise off-line modeling method is proposed for estimating the transfer function of secondary path. Materials and Methods: The acquisition program is implemented based on LabVIEW FPGA terminal. Then the acquired signal is transmitted to the host computer where the secondary path modeling program is achieved. Finally, the active noise control system simulation program is developed relying on the estimated parameters of the secondary path transfer function during the running of simulation program in the host computer. Results: The estimation of the secondary path transfer function is acquired. Finally around 19 dB (compared with primary noise) noise reduction can be achieved in the simulation of the active noise control system. Conclusions: The secondary path modeling and the active noise control system simulation program are accomplished based on LabVIEW software, which provides a good platform for the noise of real-time controlling.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[Research on clinical application value of MRI PWI technology evaluating brain blood state in severe brain injury with hyperbaric oxygen intervention]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.008</link>
<description><![CDATA[Objective: The aim of the current study is to explore the clinical application value of magnetic resonance imaging perfusion weighted imaging (PWI) technology evaluating brain blood state in traumatic brain injury (TBI) with hyperbaric oxygen (HBO) intervention. Materials and Methods: We selected 20 patients with severe brain injury who were then devided into hyperbaric oxygen therapy group and nonhyperbaric oxygen therapy group. Compared the difference of the cerebral blood flow (CBF) and the cerebral blood volume (CBV) on MRI PWI between the two groups in time intervals. Evaluated the therapeutic effect of hyperbaric oxygen intervention in severe brain injury according to CBF and CBV, and then predicting TBI prognosis. Results: The CBF and CBV values of the PWI images in HBO group were significantly better than control group, the difference was statistically significant (P＜0.05). Conclusions: Severe brain injury with hyperbaric oxygen intervention has a stimulative effect on the recovery of brain injury, recanalization of local blood flow, and recovery of blood volume. MRI PWI technology has high clinical application value in severe brain injury with HBO intervention.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[Clinical research of voxel-based morphometry (VBM) in ophthalmology]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.010</link>
<description><![CDATA[With the rapid development of medical imaging technology and increasing requirement of clinical ophthalmic diagnosis, the magnetic resonance imaging (MRI) technology has been widely used in the diagnosis, treatment and the prognostic evaluation of ophthalmic diseases. The voxel-based morphometry (VBM) analyzed the changes in the cerebral gray and white matter density or volume of each voxel in MRI by quantitative calculation, reflecting the difference of the corresponding anatomical structure. In addition, VBM, as a new magnetic resonance imaging technology, has been widely used in the research of clinical ophthalmic diseases in recent years, which provides a powerful tool for elucidating the pathological mechanism and monitoring the course of disease. This paper will briefly review the clinical application of VBM in ophthalmological diseases.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[The progress of liver fibrosis quantitative evaluation by MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.011</link>
<description><![CDATA[Liver fibrosis is a healing reaction caused by various acute or chronic liver injuries. Early diagnosis and evaluation of liver fibrosis and then timely intervention can effectively control or even halt the progression of the disease. In recent years, a variety of imaging techniques based on ultrasound, CT, and MRI have been used for quantitative assessment of hepatic fibrosis. This article aims to review the principle of diffusion-weighted imaging (DWI), diffusion kurtosis imaging (DKI), dynamic contrast-enhanced T1 mapping, and magnetic resonance elastography (MRE) based on MR imaging and the application to liver fibrosis.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[Research advances in evaluation of anterior cruciate ligament injuries and patellar femoral instability by MRI of different knee positions]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.012</link>
<description><![CDATA[Magnetic resonance imaging is widely used in imaging diagnosis of knee injuries. At present, most domestic hospitals adopt supine extended position in routine MRI knee scans. However, due to anatomical relationship and kinematic characteristics of knee in different flexion positions, the evaluation of knee injuries in extended knee may be inaccurate, especially in the judgment of anterior cruciate ligament injuries and patellar femoral instability. This article mainly reviews the research progress in evaluation of anterior cruciate ligament injuries and patellar femoral instability by MRI of different knee positions, and aims to explore the value of multi-angle scanning in improving the diagnostic accuracy of knee injuries.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[Progress in imaging diagnosis of osteonecrosis of the femoral head after developmental dysplasia of the hip]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.013</link>
<description><![CDATA[Developmental dysplasia of the hip is one of the most common extremity abnormalities in pediatric orthopedics. Closed reduction is the most common way of the treatment. Ischemic necrosis of the epiphysis of the femoral head is one of the most serious iatrogenic complications after closed reduction of developmental dislocation of the hip joint. MR perfusion imaging can be used to detect the symptoms of femoral head ischemia early. Serious consequences caused by untimely discovery could be avoided. This article will discuss the causes of avascular necrosis of the femoral head after developmental dysplasia of the hip and the development of imaging diagnosis of the necrosis of the femoral head.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
<item>
<title><![CDATA[Research progresses of multimodal magnetic resonance imaging in uterine leiomyoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2018.09.014</link>
<description><![CDATA[Uterine leiomyoma is the most common benign tumors of the reproductive system. It can be divided into submucosal, intramural and subserosal according to the location. Many leiomyomas are asymptomatic, but in 30%—40% of cases, they show a variety of symptoms, depending on the location and size. Leiomyomas can cause dysmenorrhea, heavy menstrual bleeding, infertility and pressure symptoms. There are various methods to treat it, including suegical interventions which is the most common strategies, but it doesn't have the advantages of small wounds and retention reproductive functions and non-surgical treatment which is more and more popular. It is often difficult to distinguish leiomyomas and malignant tumors due to the degeneration of leiomyomas, casuing some problems for the chinician to choose the surgical method. Therefore, it's important to make a correct diagnosis before operation.  Magnetic resonance imaging (MRI) is an important method for the diagnosis of uterine fibroids, especially multimodal MRI technology, which combines the features of morphology and function of tumors. Not only providing more comprehensive characteristics of leiomyomas, but also exploring the mechanism of symptoms caused by fibroids. So, multimodal MRI plays an important role in the identification of atypical fibroids and uterine malignancies. The author intends to review the progress of multimodality MRI in uterine leiomyoma.]]></description>
<pubDate>Thu,20 Sep 2018 00:00:00  GMT</pubDate>
</item>
</channel>
</rss>
