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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=202002</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[Modern fMRI exploring the neuromechanism of traditional acupuncture]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.001</link>
<description><![CDATA[In recent years, functional magnetic resonance imaging (fMRI) has gradually increased to explore the brain effect and neuromechanism of acupuncture and moxibustion, and has made a series of new progress. The study was carried out on healthy subjects or the patients before and after the treatment. Multimodality imaging methods such as task, resting state and brain structure were used to observe the changes of brain morphology, functional activation and network after acupuncture. The brain effect characteristics of acupuncture at acupoints, especially the brain function and network change rules related to acupuncture effect, were preliminarily discovered. These findings enriched the basis of acupuncture as the brain science aspect.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[The preliminary study of clinical efficacy and brain mechanism of auricular electro-acupuncture on treatment-tesistant depression monitored by resting state fMRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.002</link>
<description><![CDATA[Objective: To observe the clinical efficacy of auricular electro-acupuncture on treatment-resistant depression (TRD), and then to explore its brain mechanism monitored by resting state functional magnetic resonance imaging (rs-fMRI). Materials and Methods: 20 patients with TRD were enrolled with the auricular electro-acupuncture for 8 weeks. Before the treatment (week 0) and after treatment (week 8), 17 Hamilton Depression Scale (HAMD-17) was used to evaluate its antidepressant effect; Using rs-fMRI technique. The rs-fMRI scans were performed on a 3.0 T MRI scanner (Magnetom Skyra, Siemens, Germany) before and after 8-week. We selected the bilateral rACC as the seed regions to compare the changes of functional connectivity (FC) before and after treatment. Finally to analyze the correlation between clinical efficacy and changes in FC after 8 weeks in TRD. Results:17 subjects with TRD completed clinical studies. Comparing the HAMD-17 scores between 0 week and 8 weeks after treatment, the differences show statistically significant (P＜0.001). 9 subjects with TRD completed brain mechanism studies. FC increased between the right rACC and the left Precuneus/ Postcentral_L(aal), the left rACC and left Lingual Gyrus/left Precuneus/Postcentral_L(aal); FC decreased between the left rACC and the right Precuneus. The FC increases between the left rACC and left lingual gyrus was significantly positively associated with the HAMD-17 score reduction (r=0.840, P=0.005). Conclusions: Auricular electro-acupuncture is effective in the treatment of TRD. Its antidepressant effects is possible related with the FC between rACC and precuneus, rACC and lingual gyrus.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Study on the changes in immediate and dynamic regional brain homogeneity by electroacupuncture at Baihui acupoint]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.003</link>
<description><![CDATA[Objective: To compare the difference of regional homogeneity (ReHo) between post-acupuncture and electro-acupuncture stimulation with pre-acupuncture at Baihui acupoint. And to explore the immediate changes of blood oxygenation level dependent functional magnetic resonance imaging (BOLD-fMRI) by electro-acupuncture at Baihui acupoint. Materials and Methods: 20 healthy subjects were selected. After acupuncture and "de qi", connected with the electro-acupuncture stimulator. The scanning was carried out at 3.0 T MRI. Using the flexible head coil, BOLD-fMRI scanning was performed before injection, after injection and during electrical stimulation. The data were processed by RESTplus, and the results were tested by paired t-test. Results: After acupuncture, compared with pre-acupuncture, the brain area with higher ReHo value were left postcentral gyrus and right precentral gyrus, and the brain area with lower ReHo value were bilateral middle temporal gyrus and cerebellum. When the Baihui acupoint was stimulating by electro-acupuncture, compared with pre-acupuncture, the brain area with higher ReHo value were bilateral postcentral gyrus, bilateral precentral gyrus, right superior temporal gyrus, bilateral lingual gyrus, right insular, left calcarine, and the brain area with lower ReHo value were bilateral precuneus and cerebellum. Conclusions: In this study, we obtained the change of ReHo value of “Deqi” state by acupuncture at Baihui acupoint, and which immediately during the electro-acupuncture stimulation. Which proved a feasible method to study the immediate brain effect of head acupoint electro-acupuncture by using the head flexible coil and supporting device.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Study on fMRI of brain resting state in patients with mild cognitive impairment treated by acupuncture]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.004</link>
<description><![CDATA[Objective: To analyze the changes of amplitude of low-frequency fluctuation (ALFF) in brain region of patients with mild cognitive impairment (MCI) before and after acupuncture treatment, and to explore the central mechanism of acupuncture in patients with MCI. Materials and Methods: The patients with MCI who met the inclusion criteria were treated with “Yuanluo Tongjing” acupuncture therapy for 28 days. The clinical efficacy was evaluated by mini-mental state examination (MMSE) and montreal cognitive assessment (MoCA), statistical analysis was performed using SPSS 25.0 statistical software package. Resting state functional magnetic resonance imaging (rs-fMRI) was used with 3.0 T magnetic resonance scanner before and after treatment. The image data were preprocessed by DPARSFA software to obtain ALFF imaging indexes, then SPM12 and xjView software were used to analyze and present the results. Results:Compared with the pre-treatment, the scores of MMSE and MoCA after acupuncture treatment were significantly different (P＜0.001) and the scores increased. Compared with before treatment, the brain areas with increased ALFF value in patients with MCI after acupuncture treatment were as follows: right perihippocampal gyrus, left thalamus, right insular lobe, left anterior cingulate gyrus; the decreased ALFF value were: left posterior cerebellar lobe, left infratemporal gyrus, right infratemporal gyrus, left middle temporal gyrus, left suboccipital gyrus and left superior parietal lobule. Conclusions: The ALFFvalue of multiple brain regions changed before and after acupuncture treatment in MCI patients. Acupuncture enhanced the neural activity of brain areas related to cognitive function, and also decreased the ALFF value of compensated brain areas with enhanced pretherapy functional activity. it is speculated that acupuncture treatment of MCI can improve the symptoms of patients by regulating the neural activity of multiple brain regions.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Effect of acupuncture on corticospinal tract remodeling in patients with stroke hemiplegia based on structural MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.005</link>
<description><![CDATA[Objective: To investigate the effect of acupuncture combined with basic treatment on the remodeling of damaged corticospinal tract in hemiplegic patients with ischemic stroke by diffusion tensor imaging. Materials and Methods: 36 patients with ischemic stroke who met the criteria were randomly divided into control group and acupuncture group with 18 cases each group. The control group was treated with neurology-based Chinese and western medicine, and the acupuncture group was treated with acupuncture simultaneously. The mean value of fractional anisotropy (FA) of the entire segment of corticospinal tract and the FA value per 100 nodes of corticospinal tract in the two groups before and after treatment were compared. Results:(1) After treatment (at the end of 3 months), the mean value of FA with the affected corticospinal tract in the two groups was significantly higher than that before treatment (P＜0.05); (2) Although the mean FA values of the entire CST in the acupuncture group and the control group was not significantly difference (P＞0.05), the FA of every 100 nodes with the affected corticospinal tract in the acupuncture group and the control group were further compared after treatment, it was found that the two segments along the tract profiles had significant differences (P＜0.05, FDR corrected) between two groups, which mainly distributed in the middle segment (50—60th point) and the top segment (90—100th point). Conclusions: Acupuncture can effectively promote the structural remodeling of corticospinal tract in patients with ischemic stroke, and provide objective imaging evidence for clinical application of acupuncture to improve hemiplegia.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[The comparation of magnetic resonance spectroscopy using different sequence parameters in the prognosis of acute cerebral infarction]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.006</link>
<description><![CDATA[Objective: To investigate the clinical application value of magnetic resonance spectroscopy (MRS) in the treatment of acute cerebral infarction by using PRESS sequence-long echo time and STEAM sequence-short echo time scan. Materials and Methods: 27 patients with acute cerebral infarction were scanned by regular magnetic resonance and magnetic resonance spectroscopy using both PRESS sequence-long echo time and STEAM sequence-short echo time. Then the changes of metabolites on the infarct side and its correlation with mRS after three months were analyzed statistically and the results of two different MRS scan ways were compared. Results:(1) The contentions of NAA, Cho, Cr and the ratios of NAA/Cr, Cho/Cr in the infraction region were detected changes by two different MRS scanning techniques, but there was no significant difference between the two scan results. Lac was detected in some patients using PRESS sequence-long echo time scan, while Lac and short T2 substances such as mI and Glx were detected in the STEAM sequence-short echo time scan. (2) There were significantly negatively correlation between the ratios of rNAA, NAA/Cr and mRS scale after 3 months by using PRESS sequence-long echo time and STEAM sequence-short echo time scan. (3) The receiver operating characteristic curve showed that the sensitivity of rNAA, rCr and NAA/Cr in the infraction region to predict the prognosis of patients with acute cerebral infarction were 88.9%, 66.7%, 77.8% and specificity were 80%, 80%, 60% by using STEAM sequence-short echo time scan; while the sensitivity of 57.1%, 28.6%, 57.1%, and specificity of 75%, 87.5%, 87.5% by using PRESS sequence-long echo time scan. Conclusions: There have good consistency between PRESS sequence-long echo and STEAM sequence-short echo scan, which can detect changes of metabolites to reflect pathological changes in infarct areas. However, STEAM sequence-short echo scan can detect more species of metabolite abnormalities, and is superior to PRESS long echo in predicting prognosis of acute cerebral infarction.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of HR-MRI in middle cerebral atherosclerotic plaque and characteristic analysis of lenticulostriate artery]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.007</link>
<description><![CDATA[Objective: To explore the relationship between the enhancement degree of atherosclerotic plaque and vascular remodeling in middle cerebral artery (MCA) and the number and depth of lenticulostriate artery by high-resolution magnetic resonance imaging(HR-MRI). Materials and Methods: 40 patients with symptoms and 40 patients without symptoms were enrolled in this study. All subjects underwent 3D-T1WI-VISTA sequence imaging with HR-MRI. Subjects'high resolution angiographic data were transmitted to the post-processing workstation. Philips Intellispace portal software was used to calculate the plaque enhancement index and lumen remodeling index of middle cerebral artery and the number and depth of lenticulostriate artery. SPSS 25.0 software was used to analyze the plaque enhancement index and lumen remodeling index of middle cerebral artery (MCA) and the depth and number of lenticulostriate artery (LSA) in two groups. Results:Compared with the asymptomatic group, the symptomatic group had higher enhancement index of middle cerebral artery atherosclerotic plaque (P＜0.05) and shorter lengths of striated arteries than the asymptomatic group (P＜0.05). There was no significant difference between symptomatic group and asymptomatic group in the lumen remodeling index of middle cerebral artery and the number of lenticulostriate artery (P＞0.05). Conclusions: There was a certain difference between symptomatic group and asymptomatic group in the degree of enhancement of middle cerebral artery atherosclerotic plaque and the depth of lenticulostriate artery. High resolution magnetic resonance angiography has clinical value in evaluating middle cerebral artery atherosclerotic plaque.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Analysis of cerebral small vessel disease and clinical factors in young patients with symptomatic cerebral infarction]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.008</link>
<description><![CDATA[Objective: Cerebral small vessel disease (CSVD) is considered to be a common manifestation of senile cerebrovascular disease, and has a clear correlation with clinical symptoms and characteristics. At the present, limited studies are available for investigating the CSVD in young patients with cerebral infarction have CSVD and the impacting clinical factor, which is the aim of this explorative study. Materials and Methods: A total of 111 cases of primary acute cerebral infarction were enrolled in this study, including 54 cases of young cerebral infarction (43 men and 11 women; 39.5 yrs) with the age less than 45 years old and 57 cases of senile cerebral infarction (37 men and 20 women; 69 yrs). Ethical approval was obtained in the local institute and consent forms were obtained. Clinical data of all patients at admission were collected, including blood pressure, fasting blood glucose, total cholesterol, triglyceride, high density lipoprotein, low density lipoprotein, homocysteine, and smoking and drinking. All subjects underwent routine MR sequences (including T1WI, T2WI and T2 FLAIR) and DWI on 1.5 T MRI scanner. Two experienced radiologists evaluated the CSVD independently as the following: enlarged perivascular spaces (EPVS) were counted and scored in basal ganglia (BG) and centrum semiovale (CS); lacunar infarction (LI) were counted, white matter hyperintensity lesions (WMH) were graded and recorded. To reduce the bias in assessment of the severity of the patient's CSVD, the patient's EPVS, WMH, LI, and CMBs scores were collectively accounted to derive the total burden scores of CSVD (TBS) (0-4 scores). The Kruskal-Wallis H test were used to compare the ranked data between groups. Correlation between CSVD and clinical factors were assessed by Multivariate Logistic regression analysis. Results:Difference among the scores of the three groups was observed (P＜0.01). Based on a pair-to-pair comparison, there was significant difference in TBS among the three groups (P＜0.05 after adjustment). The score of the infarction group was significantly higher than that of the control group, but significantly lower than the aged group. Hypertension was observed as the influencing factor of EPVS and the influencing factors of TBS (P＜0.05). Smoking was the influencing factor of CMBs (P＜0.05). LI was closely related to age (P＜0.05). Conclusions: Young patients with acute symptomatic cerebral infarction often combined with CSVD, and hypertension, smoking and age are the influencing factors.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Correlation between IVIM-DWI quantitative parameter histogram and Ki-67 proliferation index of breast cancer]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.009</link>
<description><![CDATA[Objective: To explore the correlation between histogram quantitative parameters of diffusion-weighted imaging (DWI) single index and intravoxel incoherent motion (IVIM) dual index model and Ki-67 proliferation index of breast cancer. Materials and Methods: A retrospective analysis of 56 patients with pathologically confirmed breast cancer, a total of 57 lesions. All the subjects were performed preoperatively with MRI examination (plain scan, multi-b value DWI and dynamic contrast-enhanced), IVIM histogram parameters (ADC, D, D*, and f) were obtained by post-processing software, including minimum, maximum, mean, 10th, 25th, 50th (median), 75th, 90th, skewness and kurtosis. IVIM histogram parameters (ADC, D, D*, and f) of patients with different Ki-67 expression were compared to explore the relationships between MRI and immunohistochemical findings of patients with breast cancer; Correlation between histogram parameters and breast cancer Ki-67 proliferation index by Spearman correlation coefficient. Results:The ADC value (skewness and kurtosis), D value (skewness and kurtosis), D* value (mean, maximum, skewness and kurtosis) in the Ki-67 high-expression group were significantly higher than those in the Ki-67 low-expression group, D* value (minimum) in the Ki-67 high-expression group was lower than that of Ki-67 low-expression group (P＜0.05), while no significant differences were showed in all histogram parameters of f-value between the two groups (P＞0.05). ADC value (skewness and kurtosis), D value(skewness and kurtosis), D* value (mean, maximum, skewness and kurtosis) were positively correlated with Ki-67 proliferation index (r=0.296—0.509, P＜0.05), D* value (minimum) was negatively correlated with Ki-67 proliferation index (r=-0.262, P＜0.05). Conclusions: IVIM-DWI histogram quantitative parameters were correlated with Ki-67 proliferation index of breast cancer, and the maximum value of D* has the highest correlation. This may indicate the potential to provide a surrogate measure of Ki-67 expression through non-invasive imaging methods.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Differential diagnosis of breast medullary carcinoma and fibroadenoma by MRI]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.010</link>
<description><![CDATA[Objective: To explore the value of MRI in the diagnosis of breast medullary and fibroadenoma. Materials and Methods: Data of 9 cases of breast medullary cancer and 15 cases of fibroadenoma confirmed by pathology were retrospectively analyzed and compared. Evaluation the differential diagnostic performance of the ADCmean and the first order features of radiomics based on apparent diffusion coefficient (ADC) maps reconstructed in conventional diffusion-weighted images (DWI) of the cases. Results:The age of patients in medullary carcinoma group was older than that of fibroadenoma group (t=2.446, P=0.022). The maximum diameter of lesions in medullary carcinoma group was larger than that in fibroadenoma group (t=2.254, P=0.033). There were differences in lesion morphology, enhancement characteristics, necrosis and cystic degeneration, signal intensity of plain T2WI lesions, signal intensity of DWI lesions and time-signal intensity curve (TIC) types between the two groups. There are statistically difference in ADCmean between the two groups. Through first order features analysis based on ADC map, Correlation, Energy, Homogeneity, Mean, Standard_Deviation, Entropy, Variance, Kurtosis, IDM demonstrated significant difference between breast medullary carcinoma and breast fibro-adenoma group differences. Conclusions: MRI features of lesions are helpful in differentiating medullary breast cancer from fibroadenoma. ADCmean and some first-order features of lesions have high value in the differential diagnosis.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of intestinal filling specifications of ESGAR and ESPR MR enterography recommendation in patients undergoing gastrointestinal tumor surgery]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.011</link>
<description><![CDATA[Objective: To investigate the feasibility of intestinal filling specifications of European Society of Gastrointestinal and Abdominal Radiology (ESGAR) and European Society of Paediatric Radiology (ESPR) recommendation of MR enterography in patients undergoing gastrointestinal tumor surgery and to analyze the effect of gastrointestinal surgery on bowel distention. Materials and Methods: A retrospective study was performed between Mar. 2017 and Mar. 2019, the consecutive patients who underwent gastrointestinal tumor surgery were included. Small bowel preparation was performed in accordance with the recommendation. The volume of the contrast agent was recorded. The patients who ingested 1500 mL of contrast agent were divided into the stomach tumor group, the small bowel tumor group and the colorectal tumor group according to the history of surgery. The diameters of the duodenum, jejunum (proximal and distal) and ileum (proximal and distal) were measured by two physicians and scored by 4 points and the image quality was assessed by 3 points. K-W test was used to compare the small bowel distension scores and the image quality of different groups. Results:There was no significant difference in the distension scores of duodenum, distal jejunum and proximal and distal ileum between each group (P＞0.05). There was significantly better distention of the proximal jejunum (adjusted honestly significant difference, P＜0.05) in stomach tumor group compared with the small bowel tumor group. There was significantly better distention of the proximal jejunum (adjusted honestly significant difference, P＜0.05) in colorectal tumor group compared with the small bowel tumor group. Conclusions: ESGAR and ESPR techniques are recommended for people who need response assessment of post-operative gastrointestinal tumor evaluation. Gastrointestinal tumor surgery has no significant effect on the bowel distension with the exception of proximal jejunum.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Study on behavior of different surface charge nanoparticles through the extravascular fluid transport pathway]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.012</link>
<description><![CDATA[Objective: To observe the transport behavior of different surface charge ferric oxide nanoparticles in the extravascular fluid transport pathway using magnetic resonance imaging. Materials and Methods: Twelve SD rats aged 6-7 weeks were divided into neutral, positive group and negative group, with 4 in each group. The lower extremity Taixi acupoint was the injection site, the magnetic resonance images of the three groups of rats were detected by Bruker's high magnetic field MRI small animal in vivo imaging system before and after injection, and the number of voxel points (volume), displacement and velocity of the signal decreased after injection were calculated and analyzed. Results:After injection, the magnetic resonance images of the electric neutral group, the positive charge group and the negative charge group showed significant decrease in the signal area; the volume of the signal decreased significantly with time (P＜0.01). The rate of increase in the signal reduction area of the electric neutral group, the positive charge group and the negative charge group decreased significantly with time (P＜0.01), and the cumulative displacement increased. The rate of increase in the signal reduction region between the three groups was significantly different (P＜0.05), the average speed of the negative charge group was significantly lower than that of the electric neutral group (P＜0.01) and positive charge group (P＜0.05). The cumulative displacement of the signal areas of the electric neutral group, the positive charge group and the negative charge group showed a significant upward trend with time (P＜0.01), the interaction between the drug groups and the observation time was statistically significant (P＜0.01). Over time, the cumulative displacement between drug groups is different, and the cumulative displacement of electrically neutral and positively charged nanoparticles is longer than the negatively charged. Conclusions: The transport speed of positively charged and electrically neutral nanoparticles in the extravascular fluid transport system is higher than the negative charge. The effect of surface charge should be considered when studying the extravascular fluid transport system as the route of administration.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[3D printing technology improved animal coils to optimize KM mice magnetic resonance imaging study]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.013</link>
<description><![CDATA[Objective: To explore optimizing the imaging of KM mice based 5 cm animal coils improved by 3D surface scanning technology. Materials and Methods: A 3D surface scanner was used to scan the 5 cm animal coil, and a mouse scanning holder was designed for optimizing multi-time point imaging of KM mice on 3.0 T MRI. After intraperitoneal anesthesia, 6 KM mice with tumor were scanned with a 5 cm animal coil on a 3.0 T MRI. Compare the images before and after the holder, the number of pre-scans, the entire scanning process, and the start and end times were recorded. The image quality assessment adopted objective and subjective indicators. The objective indicators use SNR (signal to noise ratio) and CNR (contrast to noise ratio). The subjective indicators are graded to three levels by two radiologists by the artifacts of autonomic movement and breathe appearing in the images. The measurement data were analyzed by paired t-test; the ordinal data were analyzed by Wilcoxon's rank sum test, and the test level α is 0.05; the consistency analysis between the two radiologists was evaluated by Cohen's Kappa test. Results:Two magnetic resonance coil holders (referred to as 3D holder) were successfully made using 3D printing technology. Consistency analysis of the autonomic movement and breathe artifacts between the two radiologists showed that the κ values wereall above 0.7, indicating good agreement. Without the 3D printing holder, the total pre-scan needs 21 times with a success rate of 28.57% (6/21), and the average scanning time for per KM mouse is 17.6 minutes; after using the 3D holder, it just needed 6 pre-scans in total (Each mouse was pre-scanned successfully once) with a success rate of 100% (6/6). The average scan time for per KM mouse was 10.8 minutes, so the time was shortened by 38.64%. The SNRs before and after using the holder were respectively 2.16±0.18, 2.41±0.14, and CNR were 1.48±0.11 and 1.86±0.14. Paired Wilcoxon'srank sum test was performed, and P＜0.05. Compared with the non-3D-printed holder group, using 3D printing holder reduces the autonomic movement and breathe artifacts. The two radiologists respectively graded the autonomous movement and breathe artifacts before and after the 3D printing and performed a paired Wilcoxon's rank sum test with P＜0.05. Conclusions: The magnetic resonance animal coil holder using 3D printing technology help to reduce the preparation time of animal MRI scanning, improve the comfort, facilitate the fixation, increase the success rate of scanning and image signal intensity, shorten the scanning time, reduces the artifacts caused by autonomous movement and breathe, which has important application value in magnetic resonance animal model experiments.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[CT and MRI imaging characteristics of peripheral schwannoma in different location]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.014</link>
<description><![CDATA[Objective: To analyse the CT and MRI imaging characteristics of peripheral schwannoma in different locations and improve the accuracy of preoperative diagnosis. Materials and Methods: 109 cases of peripheral schwannoma confirmed by pathology were collected and location, shape, size, CT and MRI imaging feature were analysed. Results:109 cases were located in the extremities (n=34), neck (n=21), chest wall (n=17), retroperitoneum (n=15), stomach wall (n=10), and other rare sites (n=12). The tumors tended to be elliptic (82/113) and round (27/113) in shape, with clear and smooth boundaries. Lesions in the extremities, neck and chest wall (67/75) were extending along the nerve distribution. Lesions located in extremities presented as the split fat sign, entering and exiting nerve signs and target signs. Lesions located in neck and chest wall presented as typical manifestations of CT and MRI, which including homogeneous hypodense on CT or isointense on T1WI and target sign on T2WI or multiphase enhanced CT. The atypical manifestations of CT and MRI occurred in pelvic and retroperitoneal, which presented as multilocular or thick-walled cystic density or intense and heterogeneous delayed enhancement. Lesions located in stomach wall presented as isodense, with obvious homogeneous delayed enhancement. Conclusions: The imaging characteristics of peripheral schwannoma in different locations are similar, but the CT and MRI manifestations were different according to the different locations and examination methods. It’s useful to recognize CT and MRI imaging characteristics for preoperative diagnosis.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Acute pancreatitis: Radiology structured reporting template]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.015</link>
<description><![CDATA[Acute pancreatitis is a common disease of the digestive system. Due to its different severity and complications, it has a potential risk of death. With the extensive application of the new Atlanta guideline 2012, new requirements have been put forward for imaging reports of acute pancreatitis. This article mainly introduces the structured report of acute pancreatitis in Sichuan Key Laboratory of Medical Imaging, Affiliated Hospital of North Sichuan Medical College, which is to improve the systematic understanding of this disease and to write CT/MRI reports in a standard way.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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<title><![CDATA[Progress in the application of ultrashort echo time magnetic resonance imaging in musculoskeletal system]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2020.02.017</link>
<description><![CDATA[MRI is a conventional imaging technique for the diagnosis of skeletal muscle tissue diseases, but many skeletal muscle tissues can not be clearly displayed on conventional MRI images because of their inherent short T2 values. With the application and development of ultra-short echo time (UTE) MRI technology, short T2 tissue can be directly imaged and quantitatively described. This paper gives a brief review of UTE MRI technology and its application in bone and muscle system.]]></description>
<pubDate>Thu,20 Feb 2020 00:00:00  GMT</pubDate>
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