Objective:To investigate the difference in brain activity intensity between methamphetamine (MA) dependent patients (MA group) and healthy controls (control group) using fractional amplitude of low-frequency fluctuation (fALFF), and to establish a classification model between these two groups using support vector machine (SVM).Methods:From February 2014 to October 2019, a total of 46 male MA-dependent patients and 46 male healthy controls were recruited from the Affiliated Kangning Hospital of Ningbo University. The study collected resting-state functional magnetic resonance imaging (rs-fMRI) data and analyzed the differences in brain functional activity between the two groups. This analysis was conducted using both static and dynamic fractional amplitude of low-frequency fluctuations (d-fALFF). Additionally, the study examined the correlation between fALFF/d-fALFF values in specific brain regions and the total scores, as well as each factor score, of the Brief Psychiatric Rating Scale (BPRS). Furthermore, the relationship between fALFF/d-fALFF values and the age of first use and total dose of MA in the MA group was investigated. Finally, the fALFF map and d-fALFF map of brain regions with significant differences between groups were used as features for constructing classification.Results:Compared to the healthy control group, those dependent on MA showed significantly increased fALFF mainly in the nucleus accumbens, caudate nucleus, thalamus, and amygdala nucleus( t=-5.21--2.72, all P<0.05). The MA group exhibited decreased fALFF in the superior frontal gyrus, middle frontal gyrus, orbital gyrus, and cingulate gyrus( t=3.59-5.00, all P<0.05). Most of the brain regions with decreased d-fALFF overlapped with those exhibiting decreased fALFF( t=3.33-4.87, all P<0.05). The results of the correlation analysis showed that the fALFF value of the right nucleus accumbens was positively correlated with the age of first use of MA ( r=0.537, P<0.001). There is no significant relationship between the abnormal fALFF and d-fALFF values in the MA group and the total scores and each factor scores of BPRS, as well as the total dose of MA taken (after removing outliers). Based on fALFF and d-fALFF values, the SVM classifier achieved accuracies of 90.33%±6.89% and 71.56%±7.80%, respectively. Conclusions:There are significant abnormalities in the low-frequency fluctuation of the resting brain in patients dependent on MA. These abnormalities reflect the rigidity of prefrontal cortex activity, functional impairment, and dysfunction of the anti-reward system. These factors may be one of the causes for MA dependent behavior and repeated episodes. In addition, the fALFF values may be helpful for distinguishing MA dependent individuals from the control group.

Objective:To investigate the difference in brain activity intensity between methamphetamine (MA) dependent patients (MA group) and healthy controls (control group) using fractional amplitude of low-frequency fluctuation (fALFF), and to establish a classification model between these two groups using support vector machine (SVM).Methods:From February 2014 to October 2019, a total of 46 male MA-dependent patients and 46 male healthy controls were recruited from the Affiliated Kangning Hospital of Ningbo University. The study collected resting-state functional magnetic resonance imaging (rs-fMRI) data and analyzed the differences in brain functional activity between the two groups. This analysis was conducted using both static and dynamic fractional amplitude of low-frequency fluctuations (d-fALFF). Additionally, the study examined the correlation between fALFF/d-fALFF values in specific brain regions and the total scores, as well as each factor score, of the Brief Psychiatric Rating Scale (BPRS). Furthermore, the relationship between fALFF/d-fALFF values and the age of first use and total dose of MA in the MA group was investigated. Finally, the fALFF map and d-fALFF map of brain regions with significant differences between groups were used as features for constructing classification.Results:Compared to the healthy control group, those dependent on MA showed significantly increased fALFF mainly in the nucleus accumbens, caudate nucleus, thalamus, and amygdala nucleus( t=-5.21--2.72, all P<0.05). The MA group exhibited decreased fALFF in the superior frontal gyrus, middle frontal gyrus, orbital gyrus, and cingulate gyrus( t=3.59-5.00, all P<0.05). Most of the brain regions with decreased d-fALFF overlapped with those exhibiting decreased fALFF( t=3.33-4.87, all P<0.05). The results of the correlation analysis showed that the fALFF value of the right nucleus accumbens was positively correlated with the age of first use of MA ( r=0.537, P<0.001). There is no significant relationship between the abnormal fALFF and d-fALFF values in the MA group and the total scores and each factor scores of BPRS, as well as the total dose of MA taken (after removing outliers). Based on fALFF and d-fALFF values, the SVM classifier achieved accuracies of 90.33%±6.89% and 71.56%±7.80%, respectively. Conclusions:There are significant abnormalities in the low-frequency fluctuation of the resting brain in patients dependent on MA. These abnormalities reflect the rigidity of prefrontal cortex activity, functional impairment, and dysfunction of the anti-reward system. These factors may be one of the causes for MA dependent behavior and repeated episodes. In addition, the fALFF values may be helpful for distinguishing MA dependent individuals from the control group.

Objective:To investigate the assessment value of X-ray angiography in postoperative recurrence,curative effect and reduction of the perfusion of liver tumor of interventional transarterial chemoembolization(TACE)for liver cancer.Methods:A total of 59 patients with liver cancer who were treated in The Third the People's Hospital of Bengbu from January 2015 to December 2020 were selected.All patients underwent the examination of routine X-ray angiography one week before surgery and four weeks after surgery.The obtained image sequences were imported into the workstation equipped with imaging technology software of color coded digital subtraction angiography(ccDSA)to conduct analysis.The region of interest(ROI)was manually defined on the ccDSA images before and after TACE.And then,the time intensity curve was obtained,and the quantitative perfusion parameters included the time to peak(TTP),area under curve(AUC),maximum slope(MS)were exported from that.The receiver operating characteristics(ROC)curve was drawn,and the area under curve(AUC)of that was calculated to analyze the assessment efficacy of perfusion parameters on the postoperative recurrence,curative effect and reduction of the perfusion of liver tumor of TACE for liver cancer.Results:In the 59 patients who were included in the study,39 cases occurred postoperative recurrence and 20 cases did not occurred postoperative recurrence according to the definition of postoperative recurrence,and the perfusion TTP(7.38±1.22)s of patients with postoperative recurrence was significantly lower than that(9.03±1.01)s of patients without postoperative recurrence,and the difference of that between them was significant(t=5.198,P<0.05).The AUC and MS of patients with postoperative recurrence were significantly lower than those of patients without postoperative recurrence(t=2.868,31.499,P<0.05),respectively.There were not significant differences in TTP,AUC and MS between patients with and without postoperative recurrence before surgery(P>0.05).According to the determination criteria of curative effect,35 cases were effectiveness,and 24 cases were ineffectiveness,and the postoperative TTP(9.09±1.08)s of patients with effectiveness was significantly higher than that(7.84±2.07)s of patients without effectiveness(t=3.029,P<0.05),and AUC and MS of patients with effectiveness were significantly higher than those of patients without ineffectiveness(t=3.852,54.366,P<0.05),and there were not significant differences in preoperative TTP,AUC and MS between patients with and without effectiveness(P>0.05),and the values of TTP,AUC and MS of the group with effectiveness and group without effectiveness after surgery were significantly higher than those before surgery,and the differences of them between two groups were significant(t=3.029,3.852,54.366,P<0.05),respectively.According to the grading criteria of subjective angiographic endpoints(SACE),33 cases were grade Ⅲ,and 26 cases were grade Ⅳ,and there were not significant in TTP,AUC and MS between patients with grade Ⅲ and patients with grade IV(P>0.05).The postoperative TTP,AUC and MS of patients with grade Ⅳ were significantly lower than those of patients with grade Ⅲ(t=7.679,3.498,58.968,P<0.05),respectively.The sensitivities of TTP,AUC and MS were respectively 66.70%,89.70% and 59.00% in assessing postoperative recurrence of interventional TACE for liver cancer,and the specificities of them were respectively 55.00%,55.00% and 55.00%,and the AUC values of them were respectively 0.629(95% CI:0.478-0.779),0.827(95% CI:0.723-0.931)and 0.512(95% CI:0.356-0.667).The sensitivities of TTP,AUC and MS were respectively 64.10%,79.50% and 61.50% in assessing postoperatively curative effect of interventional TACE for liver cancer,and the specificities of them were respectively 55.00%,65.00% and 55.00%,and the AUC values of them were respectively 0.609(95% CI:0.462-0.756),0.808(95% CI:0.698-0.918)and 0.580(95% CI:0.413-0.747).The sensitivities of TTP,AUC and MS were respectively 69.20%,82.10% and 53.80% in assessing the postoperative reduction of the perfusion of liver tumor of interventional TACE for liver cancer,and the specificities of them were respectively 70.00%,75.00% and 55.00%,and the AUC values of them were respectively 0.745(95% CI:0.613-0.877),0.842(95% CI:0.724-0.960)and 0.507(95% CI:0.360-0.654).Conclusion:The TTP,AUC and MS of perfusion parameters that are obtained by ccDSA quantitative analysis for the data after X-ray angiography examination have a certain application value in assessing the postoperative recurrence,curative effect and the reduction of the perfusion of liver tumor of interventional TACE for liver cancer.

Femoral fracture is a common type of fracture in clinical practice, and poor fracture reduction may lead to malunion and dysfunction. At present, traditional reduction with manipulation and intramedullary nailing are the mainstream treatments, but there exist problems such as X-ray exposure or poor reduction. Fracture reduction robots are of positive significance in improving the safety of surgical treatment of femur fracture, avoiding repetitive operations and poor alignment, and shortening the patients′ postoperative recovery time. Navigation algorithm is the key to achieve the function of femoral repositioning. Understanding the advantages and disadvantages that various types of navigation algorithms demonstrated in femoral reduction applications is important for giving full play to the value of fracture reduction robots in femoral reduction. Therefore, the authors reviewed the research progress in existing robot navigation algorithms applied in femoral fracture repositioning from the following four aspects, including image alignment algorithm, algorithm for establishing the target pose of femoral repositioning, algorithm for compensating the mechanical error, and algorithm for path planning, hoping to provide a reference for the application and research of navigation algorithms of fracture reduction robots.

Bone defects, often accompanied by osteomyelitis, soft tissue contusions, etc, are facing lengthy treatment process and slow healing, seriously jeopardizing the structural integrity of the human bone tissue. Currently, the main treatment for bone defects involves autologous or allogeneic bone transplant. However, autologous bone transplant poses problems, including long surgical duration, increased pain and complications such as infections. Additionally, immune rejection reactions also limit the effectiveness of allogeneic bone transplant of the same species. Bone scaffolds have become a potential alternative for bone transplant, but problems such as sharp edges of the scaffolds and poor compatibility with human tissues exist. Triply periodic minimal surface (TPMS), with an average curvature of zero has lower levels of stress concentration and the ability to be precisely expressed with mathematical formulas, compared with other structures. Its application in bone scaffolds attracts much attention, but there is currently a lack of comprehensive understanding of the impacts of different types of TPMS on the performance of bone scaffolds. With this purpose, the authors reviewed the research progress in the impacts of different types of TPMS on the performance of bone scaffolds, providing a reference for the construction of bone scaffolds.

OBJECTIVE: To summarize the influence of microstructure on performance of triply-periodic minimal surface (TPMS) bone scaffolds. METHODS: The relevant literature on the microstructure of TPMS bone scaffolds both domestically and internationally in recent years was widely reviewed, and the research progress in the imfluence of microstructure on the performance of bone scaffolds was summarized. RESULTS: The microstructure characteristics of TPMS bone scaffolds, such as pore shape, porosity, pore size, curvature, specific surface area, and tortuosity, exert a profound influence on bone scaffold performance. By finely adjusting the above parameters, it becomes feasible to substantially optimize the structural mechanical characteristics of the scaffold, thereby effectively preempting the occurrence of stress shielding phenomena. Concurrently, the manipulation of these parameters can also optimize the scaffold's biological performance, facilitating cell adhesion, proliferation, and growth, while facilitating the ingrowth and permeation of bone tissue. Ultimately, the ideal bone fusion results will obtain. CONCLUSION The microstructure significantly and substantially influences the performance of TPMS bone scaffolds. By deeply exploring the characteristics of these microstructure effects on the performance of bone scaffolds, the design of bone scaffolds can be further optimized to better match specific implantation regions.
Tissue Scaffolds/chemistry* ; Tissue Engineering/methods* ; Bone and Bones ; Porosity

OBJECTIVE: To review the research progress of design of bone scaffolds with different single cell structures. METHODS: The related literature on the study of bone scaffolds with different single cell structures at home and abroad in recent years was extensively reviewed, and the research progress was summarized. RESULTS: The single cell structure of bone scaffold can be divided into regular cell structure, irregular cell structure, cell structure designed based on topology optimization theory, and cell structure designed based on triply periodic minimal surface. Different single cell structures have different structural morphology and geometric characteristics, and the selection of single cell structure directly determines the mechanical properties and biological properties of bone scaffold. It is very important to choose a reasonable cell structure for bone scaffold to replace the original bone tissue. CONCLUSION Bone scaffolds have been widely studied, but there are many kinds of bone scaffolds at present, and the optimization of single cell structure should be considered comprehensively, which is helpful to develop bone scaffolds with excellent performance and provide effective support for bone tissue.
Bone and Bones ; Tissue Scaffolds

OBJECTIVE To observe the efficacy and safety of albumin-bound paclitaxel in the treatment of advanced non- small cell lung cancer （NSCLC）. METHODS Clinical data of patients with advanced NSCLC treated in our hospital from January 2018 to December 2021 were selected. According to their chemotherapy regimen，they were divided into albumin-bound paclitaxel group and paclitaxel group， with 100 patients in each group. Both groups received chemotherapy regimen containing Paclitaxel for injection （albumin-bound） or Paclitaxel injection for at least 2 cycles （every 21 days as a cycle）. The progression-free survival （PFS） and efficacy of the two groups were compared，and the occurrence of toxic and side effects were recorded. RESULTS The patients in albumin-bound paclitaxel group completed 430 cycles of chemotherapy， with an average of 4.3 cycles； patients in paclitaxel group completed 476 cycles of chemotherapy， with an average of 4.8 cycles. The median PFS （4.0 months） and the response rate （13.00%） of albumin-bound paclitaxel group were not significantly different from those of paclitaxel group （4.0 months，9.00%） （P＞0.05）. The disease control rate （99.00%） was significantly higher than that in paclitaxel group （89.00%）， and the incidences of leukopenia， neutropenia， thrombocytopenia，anemia， sensory neuropathy， fatigue，nausea and vomiting，joint myalgia in albumin-bound paclitaxel group were significantly lower than those in paclitaxel group （P＜0.05）. CONCLUSIONS Albumin-bound paclitaxel is effective in the treatment of advanced NSCLC， and it can better control the progression of the disease and is safer than ordinary paclitaxel.

Objective: To identify epidermal growth factor receptor (EGFR) mutations in lung adenocarcinoma based on 18 F-fluorodeoxyglucose (FDG) PET/CT radiomics and clinical features and to distinguish EGFR exon 19 deletion (19 del) and exon 21 L858R missense (21 L858R) mutations using FDG PET/CT radiomics. Materials and Methods: We retrospectively analyzed 179 patients with lung adenocarcinoma. They were randomly assigned to training (n = 125) and testing (n = 54) cohorts in a 7:3 ratio. A total of 2632 radiomics features were extracted from the tumor region of interest from the PET (1316) and CT (1316) images. Six PET/CT radiomics features that remained after the feature selection step were used to calculate the radiomics model score (rad-score). Subsequently, a combined clinical and radiomics model was constructed based on sex, smoking history, tumor diameter, and rad-score. The performance of the combined model in identifying EGFR mutations was assessed using a receiver operating characteristic (ROC) curve. Furthermore, in a subsample of 99 patients, a PET/CT radiomics model for distinguishing 19 del and 21 L858R EGFR mutational subtypes was established, and its performance was evaluated. Results: The area under the ROC curve (AUROC) and accuracy of the combined clinical and PET/CT radiomics models were 0.882 and 81.6%, respectively, in the training cohort and 0.837 and 74.1%, respectively, in the testing cohort. The AUROC and accuracy of the radiomics model for distinguishing between 19 del and 21 L858R EGFR mutational subtypes were 0.708 and 66.7%, respectively, in the training cohort and 0.652 and 56.7%, respectively, in the testing cohort. Conclusion The combined clinical and PET/CT radiomics model could identify the EGFR mutational status in lung adenocarcinoma with moderate accuracy. However, distinguishing between EGFR 19 del and 21 L858R mutational subtypes was more challenging using PET/CT radiomics.

Objective:To investigate the differences of spontaneous neural activity and functional connectivity between bilateral symmetrical voxels in the local brain regions at resting-state of methamphetamine (MA) dependent patients and healthy controls (HCs).Methods:Forty-six MA-dependent patients, admitted to and received drug rehabilitation treatment for the first time in our hospital from February 2014 to October 2019, and 46 HCs matched with age, gender and education level during the same period were enrolled in this study. The resting state functional magnetic resonance imaging (rs-fMRI) data of these subjects were collected; the static and dynamic regional homogeneity (ReHo, d-ReHo) and static and dynamic voxel-mirrored homotopic connectivity (VMHC, d-VMHC) were used to evaluate MA-related alterations of brain spontaneous activity and interhemispheric functional connectivity. The correlations of brief psychiatric rating scale (BPRS) scores with above values in the brain regions with significant inter-group differences were analyzed.Results:As compared with the HCs, the MA-dependent patients had significantly decreased ReHo in the left medial orbitofrontal cortex (mOFC), and significantly increased d-ReHo in the left mOFC, left middle frontal gyrus, bilateral inferior frontal gyrus, left precentral gyrus and left postcentral gyrus ( P<0.05). As compared with the HCs, the MA-dependent patients had significantly decreased VMHC in the bilateral mOFC, precentral gyrus and postcentral gyrus ( P<0.05). The ReHo, VMHC, d-ReHo, and d-VMHC were not significantly correlated with total scores and each factor scores of BPRS, and total dose of MA (after removing outliers) in MA-dependent patients ( P>0.05). Conclusion:During resting state, MA-dependent patients show obvious abnormalities in the coordination and stability of spontaneous neural activity and the coordination of interhemispheric activity in local brain regions, especially in the mOFC; abnormal ReHo, d-ReHo and VMHC in left mOFC may be important neuroimaging biomarkers for MA-dependence.