http://med-sci.cn/cgzcx/en/contents_list.asp?issue=202201 zh-cn An RSS feed for Chinese Journal of Magnetic Resonance Imaging http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.001 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.002 ^,s no statistical difference between two groups in term of aCBV and ATT. No evident statistical difference was seen in statistics of perfusion parameters of the frontal lobe and temporal lobe. Conclusions: Hemorrhagic moyamoya disease has the lower perfusion than ischemic moyamoya. pCASL can detect the grade of blood flow failure in adults with hemorrhagic moyamoya disease, monitor tiny ischemic changes in peripheral frontal and temporal lobes, which can provide a basis for further research on early detection of rebleeding by monitoring hemodynamics.]]> Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.003 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.004 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.005 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.006 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.007 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.008 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.009 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.010 ^,s disease (CD) lesions. Materials and Methods: A total of 51 patients diagnosed with CD were retrospectively analyzed, all of those were underwent magnetic resonance enterography (MRE), DWI and enteroscopy within 2 weeks. The lesions of bowel segments were graded as inactive (0-2), mild (3-6), and moderate-severe group (＞6) based on simplified endoscopic activity score for Crohn′s disease (SES-CD). To observe the performance of MRE and DWI, and calculate the magnetic resonance index of activity (MaRIA) and the apparent diffusion coefficient (ADC) value of the lesions. The Kruskal-Wallis rank sum test was applied to compare the differences in MaRIA and ADC values among different activity groups, and the receiver operating characteristic (ROC) curve was used to analyze the diagnostic efficiency of MaRIA and ADC values to distinguish different active lesions. Spearman analysis was used to evaluate the correlation between SES-CD and MaRIA, ADC values. Results: A total of 127 intestinal segments were included in the study. There were 15 inactive, 45 mild, and 67 moderate-severe. The SES-CD score ranged from 1.0 to 11.0. There were significant differences in MaRIA and ADC values among different groups (P＜0.01). The correlations between SES-CD and MaRIA, ADC values were 0.793 (P＜0.01) and -0.742 (P＜0.01), respectively. ROC curve analysis found that when the MaRIA was the threshold at 9.1 and the ADC value was the threshold at -1.585×10-3 mm2/s, the maximum of area under the curves (AUCs) to distinguish the inactive from the active were 0.962 (P＜0.01) and 0.957 (P＜0.01), respectively. When the MaRIA was the threshold at 11.1 and the ADC value was the threshold at -1.345×10-3 mm2/s, the maximum of AUCs to distinguish the inactive-mild from the moderate-severe were 0.942 (P＜0.01) and 0.920 (P＜0.01), respectively. Conclusions: DWI can quantitatively and accurately distinguish the lesions in different active stages of CD.]]> Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.011 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.012 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.013 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.014 ^,s therapeutic effect. Materials and Methods: Thirty-four TRD and 34 healthy volunteers were enrolled, and the data of scale^,s scores were recorded for every subject. TRD were stimulated by taVNS for 30 minutes, and the rs-fMRI data were collected twice before and after stimulation immediately. Healthy volunteers were not stimulated and only scanned once with rs-fMRI. After comparing the amplitude of low frequency fluctuation (ALFF), functional connectivity (FC) values between TRD and HC, the ALFF values of different brain regions were further extracted and analyzed for partial correlation with scale^,s scores. Results: In baseline, the ALFF values in the left pallidus/hypothalamus/caudate, the left precentral/middle frontal gyrus in the TRD group were significantly higher. ALFF values of left precentral /middle frontal gyrus were positively correlated with HAMD-17, SDS scores of TRD patients, respectively [(P=0.013, r=0.442), (P=0.026, r=0.400)]. It found that the FC value between left precentral gyrus/middle frontal gyrus and bilateral middle cingulate gyrus, support motor areas, left medial superior frontal gyrus and left lenticulate nucleus (including pallidus and putamen) was significantly higher. In TRD, the ALFF values of pre-treatment were significantly lower than that in post-treatment in the bilateral cerebellar area 1 and left cerebellar area 2 in the left inferior middle frontal gyrus orbital region. Conclusions: TRD showed the abnormal brain functional activities in limbic system-cortical-striatus-globus-pallidus-thalamus neural circuit, in which motor cortex and cognition-related brain regions may be related to the negative emotion. TaVNS can immediately regulate brain spontaneous activities in TRD patients, which involves brain regions related to emotion and cognition, and may be a potential functional brain target of taVNS therapy on TRD.]]> Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.015 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.016 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.017 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.018 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.019 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.020 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.021 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.022 ^,s Hospital were retrospectively divided into 4 groups according to their age, including 60 boys and 60 girls, olfactory bulb images were obtained by GE Discovery MR750 3.0 T coronal T2-weighted fast spin echo (FSE) sequence scan, and bilateral olfactory bulb volumes were calculated by manually delineating the boundary and adding layer by layer. Results: The olfactory bulb volumes of normal boys were (21.97±0.50) mm3 on the left,(22.51±0.49) mm3 on the right, and (44.78±0.95) mm3 in total, respectively. The olfactory bulb volumes of normal girls were (23.08± 0.82) mm3 on the left, (22.33±0.76) mm3 on the right, and (45.41±1.55) mm3 in total, respectively. There was no significant difference in the left and right olfactory bulbs volume between boys and girls (P＞0.05). There were significant differences in left and right olfactory bulb volume and total olfactory bulb volume in different age groups (P＜0.05). Conclusions: The coronal T2-weighted FSE sequence of 3.0 T magnetic resonance can clearly display the contour of olfactory bulb and can be used to measure the volume of olfactory bulb. There was no difference in the volume of left and right olfactory bulbs between boys and girls. The olfactory bulb volumes in both boys and girls tended to decrease with the increase of age. The measurement of olfactory bulb volume range in normal children may be used as one of the references to evaluate olfactory bulb lesions in children.]]> Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.023 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.024 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.025 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.026 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.032 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.033 ^,s disease (PD) is characterized by the dopamine degeneration in substantia nigra and striatum. Its clinical manifestations include motor symptoms tremor, bradykinesia and rigidity, also have additional non-motor symptoms such as depression anxiety, cognitive impairment. Tremor, as one of most common symptoms, the underlying mechanism is still unclear, about three out of four PD patients develop tremor during the course of their disease and tremor-dominant patients generally follow a more benign disease course than non-tremor patients. There is growing evidence that brain stimulation such as deep brain stimulation and transcranial magnetic stimulation has been a treatment option for PD. Recently, magnetic resonance imaging is widely used in the diagnosis and treatment of PD which can provide important information for early diagnosis and treatment effect evaluation from the aspects of structure and function. This paper reviews the application of MRI in the diagnosis of tremor-dominant PD patients and the value of MRI in evaluating the efficacy of brain stimulation therapy.]]> Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.034 ^,t detect the change of microstructure, and the ophthalmology examination also has certain subjectivity and limitations that can^,t detect the changes of posterior visual pathway. As an emerging technology, diffusion tensor imaging (DTI) can provide microstructure information and visually display white matter fiber bundles in vivo through various post-processing analysis methods combined with different parameters. It plays an important role in non-invasive exploration of neuropathological mechanisms of diseases and prognosis assessment. Recently, with the innovation of post-processing analysis methods, DTI is more and more widely used in visual pathway injury. This review introduces analysis methods of white matter fiber bundle microstructure based on DTI and its application in visual pathway injury.]]> Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.035 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.036 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.037 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.038 ^,s syndrome (SS) is a systemic autoimmune disease, and imaging examinations of the salivary glands play an important role in its diagnosis. Intravoxel incoherent motion (IVIM) imaging is a kind of multi-b diffusion weighted imaging, which can reflect and quantify the diffusion of pure water molecules and perfusion-related diffusion in the tissue at the molecular level, and then reflect the pathological and functional status. The author reviewed the basic principle and current application progress of IVIM technology in SS.]]> Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.039 Thu,20 Jan 2022 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.12015/issn.1674-8034.2022.01.040 Thu,20 Jan 2022 00:00:00 GMT