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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=201606</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[A fractional amplitude of low frequency fluctuation study of resting-state fMRI in stroke]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.001</link>
<description><![CDATA[Objective: To investigate the abnormal changes in baseline brain activity of the chronic stroke patients by using fractional amplitude of low frequency fluctuation (fALFF) of resting-state fMRI. Materials and Methods: Sixteen chronic stroke patients with left subcortical lesions and sixteen age and sex- matched healthy volunteers were performed resting-state fMRI scans. Values of fALFF were calculated in the frequency ranging from 0.01–0.08 Hz. Two-sample t-test was performed to compare the differences in fALFF between the two groups (P<0.05, corrected by AlphaSim). Results: Compared with the healthy controls, the areas where the fALFF values decreased in stroke patients mainly located in the ipsilesional thalamus and basal ganglia, of which, the fALFF values of the ipsilesional thalamus showed significantly positive correlation with the Fugl-Meyer Assessment (FMA) scores in stroke patients (r=0.54, P=0.03<0.05). Conclusion: The abnormal spontaneous neural activity of the stroke is closely related to lesions site and hand motor dysfunction. These findings help us to further understand the pathophysiological mechanisms of the motor dysfunction in stroke.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[First-episode depression resting state of brain function low frequency amplitude research]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.002</link>
<description><![CDATA[Objective: We used the method of resting-state functional magnetic resonance imaging (rfMRI) to explore the abnormal brain activity under the basic status of patients with first-episode depression and its significance. Materials and Methods: Thirty patients with depression(the DSM-IV diagnostic criteria for depression) and thirty healthy volunteers matched with it were examined using resting-state functional MRI. Data analysis was processed by using the method of low-frequency amplitude (ALFF). Results: Intergroup analysis between depression and normal ALFF group: ALFF values of the parts of bilateral frontal lobes, temporal lobe and the cingulate gyrus and the right angular gyrus in depression groups are significantly higher than those in the control group; and ALFF values of bilateral medial prefrontal cortex, cuneus, precuneus, cerebellar hemisphere decreased. Conclusion: ALFF technology which can directly reflect the change of BOLD signal caused by abnormal metabolism of depressions with emotion disorder would contribute to exploration of the pathophysiological mechanisms of depression.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[A study of rest-stating functional magnetic resonance imaging in children with attention deficit hyperactivity disorder]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.003</link>
<description><![CDATA[Objective: To investigate the regional and network pattern of the dysfunctional brain in ADHD children using resting-state functional MRI. Materials and Methods: Resting-state functional brain MR images were acquired for 10 ADHD children and 10 matched healthy controls. Parametric maps of the amplitude of low frequency fluctuations (ALFF) were calculated and group comparison was performed using a voxel-based approach, then brain regions with differences in ALFF were extracted as seeds to calculate functional connectivity (FC) maps. Results: Compared with healthy controls, children with ADHD showed increased ALFF in bilateral anterior cingulate cortex (ACC), caudate and right mid and superior-frontal cortex. When using ACC as seed region, ADHD group showed FC increase in bilateral thalami, insula and posterior cingulate cortex; when the right frontal cluster was selected as seed, FC with the right precentral gyrus and superior temporal gyrus demonstrated reduced FC in ADHD; at last, when using caudate as seed region, bilateral mid-frontal regions showed FC decrease. Conclusion: We identified abnormalities in the regional spontaneous brain activities and inter-regional functional connectivity in ADHD, indicating its association with the developmental delay or deficits of cognitive and attention network.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Research progress of functional magnetic resonance image in vulnerability to depression]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.004</link>
<description><![CDATA[Vulnerability to depression is an inner quality which can cause depression appear under certain conditions, it is the inside foundations of the disease occurrence and the researchers have pay more and more attention to it, as well as it related to biology, personality, cognition, environmental factors, there also has appeared a lot of theoretical research. In recent years with the development of fMRI technology in the neuropsychiatric field, the researchers began to use fMRI to explore the neuro-biological foundations of the vulnerability to depression. Using fMRI we examined the features of brain structure and brain function in resting state in subjects with vulnerability to depression, and explored their specificity of the biomarker, in order to provide new clue to neurobiological basis of vulnerability to depression associated with phatophysiological mechanism. In the current paper, we tried to provide a review of fMRI studies focusing on the following aspects: the definition and classification of vulnerability to depression, the brain structure and function changes in depression susceptible.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[A study of white matter lesions in older people with fall risk using diffusion tensor imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.005</link>
<description><![CDATA[Objective: To analyze the diffusion tensor imaging (DTI) and clinical characteristic of the aged who had white matter lesions with fall risks, quantify the fall risk index and provide a basis for fall precautions. Materials and Methods: People aged more than 60 years old with brain white matter lesions from Beijing Tiantan Hospital, Capital Medical University, were included in study, according to the Tinetti Balance and Gait Analysis, 15 patients were divided into experimental group (Tinetti＜25) and 29 contrast group (Tinetti≥25). The significantly different white matter fiber tracts were identified by Tract Based Spatial Statistics (TBSS) and were also made correlation analysis with MoCA, MMSE, Tinetti Gait Analysis, Tinetti Balance Analysis and TUGT. Results: There was statistic significance in the score of MMSE (t=2.806, P=0.008) and MoCA (t=2.890, P=0.006) between two groups with white matter lesions. In subjects with risk of falls, the mean FA of whole brain was lower than that of contrast group (t=2.862, P=0.007), and was positively correlated with MMSE (r=0.533, P=0.041) and MoCA (r=0.642, P=0.010). Significantly abnormal FA clusters (representing loss of WM integrity) of patients with risk of falls were seen in the right fasciculus uncinatus, genu, body and splenium of corpus callosum, both anterior corona radiate, right superior corona radiate, right superior longitudinal fasciculus and left cingulate gyrus. The mean FA of corpus callosum-genu, right superior corona radiate, body of corpus callosum, splenium of corpus callosum, right superior longitudinal fasciculus and left cingulate gyrus were positively correlated with MoCA scores in those with risk of falls(P＜0.05). The mean FA of right fasciculus uncinatus (r=0.562, P=0.029) was positively correlated with Tinetti Balance Analysis. The mean FA of right fasciculus uncinatus (r=0.572, P=0.026), body of corpus callosum (r=0.538, P=0.038), splenium of corpus callosum (r=0.580, P=0.023) and left cingulate gyrus (r=0.520, P=0.047) were positively correlated with Tinetti Gait Analysis. The mean FA of body of corpus callosum (r=–0.582, P=0.023) and left cingulate gyrus (r=–0.538, P=0.039) were negatively correlated with TUGT. Conclusion: In subjects with risk of falls, the mean FA of whole brain and some white matter fiber tracts decreased, these differences were correlated with cognition, balance and gait. Therefore, DTI can identify the structural changes in brain of those with risk of falls and quantify the fall risk index.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[The characteristics and clinic value of MRA findings of youthful acute cerebral infarction]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.006</link>
<description><![CDATA[Objective: To analyze the characteristics of MRA in young patients with acute cerebral infarction and to explore its clinical value. Materials and Methods: The MRA features of 149 young patients with acute cerebral infarction and 187 cases of middle aged and old aged patients with acute cerebral infarction were analyzed retrospectively. Results: The normal rate of MRA performance in young patients with cerebral infarction was higher than that in middle and old age group, and their limitation of target vessel abnormality was higher than that of middle aged and old age group, but their hardening of the arteries of the target vessel anomaly was lower than that of the elderly group, and the prognosis of patients with positive target vessel was better than that of the older group (P<0.05). Conclusion: Due to the difference of MRA performance between the young and midlife-senile patients with cerebral infarction is very significant, we should timely analyze the causes and risk factors of that and take different measures to treat and prevent.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Study of MRI enhancement and diffusion weighted imaging in the recurrence of nasopharyngeal carcinoma after radiotherapy]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.007</link>
<description><![CDATA[Objective: To investigate the value of conventional MRI plane scan/enhancement and diffusion weighted imaging (DWI) in the diagnosis of nasopharyngeal carcinoma (NPC) after radiotherapy. Materials and Methods: Three hundred and eighty patients proved nasopharyngeal carcinoma by biopsy were collected in our hospital. All patients were treated with radiation therapy and received a regular follow up ranging from 6 months to 3 years and MRI scan for no less than one time. Conventional MRI examinations including plan scan and Gd-DTPA enhancement, and 168 patients were scanned with DWI. Results: During the follow up, 32 patients were confirmed NPC recurrence after radiotherapy. New occurred tumors showed irregular shapes, iso-or slightly low signal on T1WI, iso-or slightly higher signal on T2WI, and moderate to obvious enhanced after contrast medium administrated. Nineteen cases were found newly occurred bone destruction in the skull base, and 12 cases were found lymph node enlargement. On DWI, recurred tumors showed moderate or high signals, and the ADC value was (0.96±0.08)×10-3 mm2/s. While most none recurrence cases showed iso-or slightly high signal while some showed slightly low signal on DWI, and the ADC value was (1.31±0.16)×10-3 mm2/s, and the difference of ADC value between two groups has statistical significance (P<0.05). Conclusion: MRI enhancement and DWI have great value in the diagnosis of recurrence of nasopharyngeal carcinoma after radiotherapy.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparison of the image quality between liver DWI with and without LIPO]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.008</link>
<description><![CDATA[Objective: To explore the difference of image quality with and without LIPO in diffusion weighted imaging(DWI). Materials and Methods: Collect 34 healthy volunteers from January 2015 to April 2016, China Medical University affiliated Shengjing Hospital, they were involved in the study, conducting DWI (b=800 s/mm2) with and without LIPO at the 3.0 T MR scanner. The signal to noise ratio(SNR) and apparent diffusion coefficient (ADC) of the two different sequences are measured by two observers at the different part of the liver. Scores of fat artifact (SFA) is evaluated at the same time. Compare the SNR and SFA of DWI-LIPO and conventional DWI sequences to evaluate the image quality. Results: SNR/ADC values of the same sequence and the same part of normal liver have no statistical differences (Z≥-0.453, P≥0.651; t≥-1.366, P≥0.191). DWI-LIPO sequence is statistically higher SNR than conventional DWI sequence of different parts of the liver (-4.590≤ Z≤-3.291, P≤0.001). SFA of DWI-LIPO sequence at the top and the right corner of the liver is lower than the conventional DWI sequence (P=0.001, 0.039). ADC values of the two sequences have no statistical difference. Conclusion: Applying LIPO technology, DWI sequence can increase the expression of fat artifact and improve the image quality of liver, without affecting the ADC values.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Value of BOLD-fMRI to transplanted kidneys with acute rejection: a preliminary study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.009</link>
<description><![CDATA[Objective: To explore the value of BOLD-fMRI to early diagnose transplanted kidneys with acute rejection. Materials and Methods: Study protocol was approved by local ethics committee; informed consent was obtained. A MR special model which included fifteen vials containing 0–3.2 mM manganese chloride in hydrochloric acid solution, and a total of 100 velunteers were enrolled and divided into three groups, as follows: Group A, 51 cases with healthy kidneys in situ; group B, 34 transplantation with stable renal function for at least 3 months after operating; and group C, 15 iliac renal allografts with early acute rejection from 1 week to 4 weeks after operating. T2W axial/coronal, T1W coronal and a coronal fat-saturated multi-echo GRE with 12 echos (9.2–53.2 ms) were performed on a 3.0 T scanner during normal breathing or breath-holding. CMR tools was used to calculate the value of R2∗ in MR model vias, renal cortex, medulla respectively after MRI. Receiver operating characteristic (ROC) curve was used to predict the kidneys with early acute rejection and threshold R2∗ value were identified to discriminate between transplanted kidneys with acute rejection, those with normal function,and healthy native renals. Results:No statistical significances were found for R2∗ values among repeated scanning on phantom (P>0.05).The value of R2∗ (Hz) on renal medulla(19.36±3.94) with acute rejection was significantly lower than those of medulla both in group A(29.73±2.92) and B(29.80±2.75) (P<0.05), however no statistical significances were found between group A and B(P>0.05), and for R2∗ on renal cortex among three groups(P>0.05). The value of R2∗ on medulla was higher than those on cortex both group A and B, moreover no statistical significance was found for R2∗ between left and right kidney in situ(P>0.05). With a medullary R2∗=24.67 Hz as diagnose critical points compared to bilpsy, the sensibility was 86.7%, the specificity was 98.5%, and the accuracy was 0.975 in the prediction of kidneys with early acute rejection. Conclusion: BOLD-fMRI is of important value in the diagnosis of renals with early-stage acute rejection.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[The simulation and design of a multi-channel RF coil for macaque]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.010</link>
<description><![CDATA[Objective: Introduce a new simulation method used to eliminate the couple between the coils for magnetic resonance, which will be applied to the design of a multi-channel receive coil. In the design of multi-channel coil for macaque, the adjacent coil’s decoupling position will be obtained by simulation. Materials and Methods: To evaluate the couple between the coils, we use electromagnetic field and circuit simulation software to calculate the coil’s electromagnetic field and S-parameter. Results: We obtain the decoupling position of the double round and the double square coil through simulation. The results are consistent with the theoretical calculation. In the design of the multi-channel receive coil, when the distance of centre is 42.2 millimeter, the couple between the coils can be neglected. Conclusion: The feasibility of the simulation method can be proved according to the results. The relative position of the adjacent coils will be obtained by simulation, which meets the demand of the design.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Brief overview of principles and methods of quantitative susceptibility mapping]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.011</link>
<description><![CDATA[Quantitative susceptibility mapping (QSM) has become a promising magnetic resonance imaging (MRI) technique for quantifying underlying magnetic properties of tissues. It provides an effective way to quantify and analyze tissue iron deposits, calcification and vessel oxygen saturation. It is also valuable in the investigation of cerebral hemorrhage, multiple sclerosis, Parkinson disease and other neurological diseases. The reconstruction of susceptibility map is a challenge work, which consists of several steps and the accuracy of susceptibility map depends on many factors. In this work, we will review the principles of quantitative susceptibility mapping and the procedure of susceptibility map reconstruction. The major methods in every step of susceptibility map reconstruction will be introduced. We will also present several major applications of QSM in clinic.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[The study progress of multi-mode MRI in the idiopathic epilepsy]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.013</link>
<description><![CDATA[The idiopathic epilepsy is a common neurological disorder characterized by abnormal hyper-synchronization of neural activity. It is important to understand the essence for the diagnosis and treatment. In the recent years, with the rapid development of mutiple MRI, it has made great progresses in the level of morphological structure imaging, the metabolism, the function and the molecular imaging, which plays an important role in the location of epilepsy, the lateralization diagnosis and the assessment of the cerebral function for the preoperative and prognosis. This article mainly discusses the new technology progresses of mutiple MRI in the idiopathicx epilepsy.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Progress in research application of magnetic resonance in rapid eye movement sleep behavior disorder]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.014</link>
<description><![CDATA[Rapid eye movement sleep behavior disorder is a parasomnia characterized by the loss of physiological muscle atonia in REM sleep, which is also accompanied by nightmares and violent or frightening active behaviors during dreaming. RBD can be an independent disease, and also frequently occur in α-synucleinopathies. However, the exact pathophysiological mechanism underlying it occurrence is not clear. With the development of imaging technology, increasing studies found the dysfunction of pons and substantia nigra striatum. In this paper, we reviewed the main magnetic resonance imaging studies in recent years.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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<title><![CDATA[Research progress on lossy compression techniques for medical images]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2016.06.015</link>
<description><![CDATA[Medical imaging has been the important basis for the medical diagnosis and treatment. With the resolution of medical imaging devices, the data amount of acquired medical images increases consistently, which creates heavy burden for image storage and transmission and seriously restricts the following application of medical images. The manner of lossy compression can realize the high degree compression for medical images under the constraint of certain image quality, which has been the research focus both at home and abroad. In this paper, the research progress on lossy compression for medical images is summarized, and the basic methods of quality evaluation under the condition of lossy compression are described. Finally, the development trend of lossy compression for medical images is expected.]]></description>
<pubDate>Mon,20 Jun 2016 00:00:00  GMT</pubDate>
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