Subjective memory complaints (SMC) is increasingly recognized as the earliest prodromal stage of Alzheimer's disease.Individuals with SMC whose memory without measurable cognitive deficits,however,demonstrated some neurodegenerative brain changes.It would be more appropriate to prevent or postpone the AD process by interventing in this earlier stage of SMC,while relatively little is known about the brain plasticity in elderly with SMC.Therefore,further research is necessary in understanding the brain plasticity in SMC on the basis of further elucidating the pathophysiological mechanisms in this group of individuals.

Objective To evaluate 3.0 T MR DWI techniques in detecting the lesions of pre and post-radiofrequency ablation of the rabbit liver VX2 tumors. Methods Twenty two New Zealand white rabbits were used in this experiment. Twenty tumor fragments were implanted into the livers of 20 rabbits respectively. Two normal rabbits were used as controls for radiofrequency ablation of the normal liver. 3.0 T MR DWI was performed 14 to 21 days after tumor implantation (mean, 17 days) in the tumor-bearing animals. Radiofrequency ablation was performed in the 18 tumor-bearing animals and in the two healthy animals. 3.0 T MRI and DWI were performed 7 to 10 days after radiofrequency ablation (mean, 8 days).Pathology was obtained immediately after the completion of post-radiofrequency ablation MR imaging. The MRI features and ADC values of pre- and post -radiofrequency ablation lesions in the liyers with VX2 tumors and normal rabbits were analyzed and correlation was made with histopathologic findings. Analysis of variance repeated measures were performed in analyzing the differences among the ADC values of different tissues with the same b value. Results All 20 rabbit liver models of VX2 tumors were constructed successfully. One rabbit died of anesthetic overdose, another one showed necrosis within the implanted tumor. All 18 untreated VX2 tumors had predominantly low or iso-signal intensity on T1 WI and high signal intensity on T2WI. All 18 VX2 tumors and 2 normal rabbits were treated by radiofrequency ablation successfully. Lesions treated by Radiofrequency ablation displayed low signal intensity on T1 WI, and high signal intensity on T2WI. Seven to 10 days after radiofrequency ablation, lesions varied from having low signal intensity to slightly increased signal intensity on T1 WI, with areas of mixed ( high, intermediate, and low) signal intensity. A peripheral rim of high signal intensity with varying thickness on T2WI correlated with granulation tissue, which exhibited intense enhancement on contrast-enhanced images. Areas of low to intermediate signal intensity within the lesion on T2WI corresponded to coagulation necrosis. The tumor tissue appeared as areas of peripheral nedularity, with intermediate to high signal intensity on T2-weighted images and DWI. The tumor specimen was gray, among the tumor tissue, there were hyperplastic vessels,and granulation tissue. When b value was 600 s/mm2 , the ADC value of viable tumor (9 cases), necrosis (18 cases), granulation tissue ( 18 cases), normal liver tissue ( 18 cases) were ( 1. 227 ±0. 140) × 10-3,(0. 702 ± 0. 050)×10-3, ( 1.918 ± 0.124) × 10-3, ( 1. 739 ± 0. 044 ) × 10-3 mm2/s, respectively, which were statistically significant (P ＜0. 01 ). When b =200,400,600,800,1000 s/mm2, the differences of ADC values among viable tumor, granulation tissue, necrosis,normal liver tissue were also statistically significant ( P ＜0. 01 ). Conclusion The rabbit liver VX2 tumor models and 3.0 T MR DWI are important tools in the basic and clinical researches of radiofrequency ablation.

ranches of portal vein were found in 3 cases. Conclusion The multi-slice spiral CT findings of eosinophilie hepatic infiltration are relatively specific, and three-phase dynamic CT studies can be a valuable tool for the diagnosis of this disease.

Objective To explore the reproducibility of normal hepatic MRS at 3.0T. Methods The hepatic proton MRS was performed with GE Signa Excite HD 3.0T system and eight-channel torso phased-array coils using PRESS sequence. Thirty-one healthy individuals were enrolled in this study. Liver spectra were collected with TR of 1500 ms, TE of 30 ms, ROI of 2 cm×2 cm×2 cm, NSA of 64 times. The outcomes were statistically analyzed with Wilcoxon signed ranks test and Spearman correlation test.Results There was no significant difference of signal to noise ratio (Z=-0.535,P=0.593), baseline stability (Z=-0.333, P=0.739), linewidth of automatic shimming (Z=-0.305, P=0.761), water suppression (Z=-1.232, P=0.218), height of lipid peak (Z=-0.558,P=0.557), area under the lipid peak (Z=-1.195,P=0.232), height of water peak (Z=-0.647,P=0.518) and area under the warter peak (Z=-0.118, P=0.906) between first examination and second examination. Correlation coefficient of the former and the later measurements of lipid area and water area were 0.784 (P<0.001) and 0.799 (P<0.001), respectively.Conclusion The reproducibility is good for in vivo liver proton MRS at 3.0T.

Objective To investigate the magnetic resonance imaging(MRI) in the diagnosis of congenital anorectal malformation.Methods Fourteen patients with congenital anorectal malformation received pelvic and sacrococcygeal MRI scan with 5 normal controls.The morphological changes of puborectalis and anal sphincter,and the abnormalities of anus,rectum,sacral vertebra and genitourinary system were observed.Results The best developed puborectalis and anal sphincter were showed in 13 cases,the better developed in 3 cases,the least developed in 3 cases,respectively.There were 7 cases with abnormalities of sacral vertebra and 5 cases with abnormalities of genitourinary system.Conclusion MRI examination plays an important role in the diagnosis of congenital anorectal malformation.The morphological changes of puborectalis and anal sphincter,and the abnormalities of sacral vertebra and genitourinary system can be determined by the MRI examination, which is important in clinical therapy planning and accessing the curative effect.

Objective:To explore the efficacy and compliance of e-aid cognitive behavioral therapy (eCBTI) in patients with situational insomnia among different age groups.Methods:A total of 194 patients with situational insomnia were recruited via a campaign of the " Prevention and Protection Handbook Against Epidemic" from March to April 2020 in Guangzhou, China.Participants were divided into two groups according to age: under 35 years old ( n=87) and 35 years old and above ( n=107). They all received one-week eCBTI intervention.Insomnia severity index (ISI), Pre-sleep arousal scale (PSAS) and Hospital anxiety and depression scale (HADS) were used to evaluate the severity of insomnia for all participants pre- and post-intervention.The change of each scale within the group and the reduction rate of each scale between groups were compared using t test and one-way ANOVA. Results:(1) Intervention efficacy: in the <35-year-old group, compared with baseline, the scores of ISI scale ((9.2±4.1), (14.8±5.1)), PSAS cognitive arousal subscale ((18.5±8.4), (23.5±6.6)), PSAS((34.3±15.8), (40.3±10.7)), HADS depression subscale ((5.8±3.6), (8.5±4.6)) and HADS anxiety subscale((7.1±3.9), (9.5±4.5) )were statistically significant after eCBTI intervention ( t= 2.88-8.80, all P<0.01), but there was no significant difference in score of PSAS body subscale ((15.8±7.8), (16.8±5.7)). In ≥35-year-old group, compared with baseline, the scores of ISI scale ((9.7±4.2), (14.4±4.3)), HADS depression subscale ((4.6±2.2), (6.6±3.5))and PSAS cognitive arousal subscale ((16.9 ±8.5), (20.0±5.8))were significantly different after intervention ( t= 2.90-6.86, all P<0.01), meanwhile the scores of PSAS body subscale ((14.3±8.0), (13.9±5.2)), PSAS((32.2±16.5), (33.9±9.2)), HADS anxiety subscale((6.1±3.2), (7.0±3.5)) were not statistically significant (all P>0.05). There was no significant difference in the score reduction rate between the two groups before and after intervention (all P>0.05). (2) Compliance: 86 cases dropped out, and the dropout rate was 61.3%.Totally 75 cases (38.7%) completed the 7-day treatment, and 119 cases (61.3%) completed the treatment within 1-6 days.Further study found that there was statistically significant difference in the reduction rate of ISI total score among the three groups with excellent, good and poor compliance ( F=5.655, P=0.004). Conclusion:eCBTI has a good effect on situational insomnia in different age groups, and there is no difference in treatment compliance.

A number of studies have indicated that disorders of consciousness result from multifocal injuries as well as from the impaired functional and anatomical connectivity between various anterior forebrain regions. However, the specific causal mechanism linking these regions remains unclear. In this study, we used spectral dynamic causal modeling to assess how the effective connections (ECs) between various regions differ between individuals. Next, we used connectome-based predictive modeling to evaluate the performance of the ECs in predicting the clinical scores of DOC patients. We found increased ECs from the striatum to the globus pallidus as well as from the globus pallidus to the posterior cingulate cortex, and decreased ECs from the globus pallidus to the thalamus and from the medial prefrontal cortex to the striatum in DOC patients as compared to healthy controls. Prediction of the patients' outcome was effective using the negative ECs as features. In summary, the present study highlights a key role of the thalamo-basal ganglia-cortical loop in DOCs and supports the anterior forebrain mesocircuit hypothesis. Furthermore, EC could be potentially used to assess the consciousness level.
Adult ; Bayes Theorem ; Connectome ; Consciousness Disorders ; diagnostic imaging ; physiopathology ; Female ; Humans ; Machine Learning ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Neural Pathways ; diagnostic imaging ; physiopathology ; Prognosis ; Prosencephalon ; diagnostic imaging ; physiopathology ; Young Adult