Objective:To optimize 3.0T MRI diagnosis indicator in breast cancer and to select the best MRI scan program.
Methods:Totally 45 patients with breast cancers were collected, and another 35 patients with benign breast tumor served as the control group. All patients underwent 3.0T MRI, including T1-weighted imaging (T1WI), fat suppression of the T2-weighted imaging (T2WI), diffusion weighted imaging (DWI), 1H magnetic resonance spectroscopy (1H-MRS) and dynamic contrast enhanced (DCE) sequence. With operation pathology results as the gold standard in the diagnosis of breast diseases, the pathological results of benign and malignant served as dependent variables, and the diagnostic indicators of MRI were taken as independent variables. We put all the indicators of MRI examination under Logistic regression analysis, established the Logistic model, and optimized the diagnosis indicators of MRI examination to further improve MRI scan of breast cancer.
Results:By Logistic regression analysis, some indicators were selected in the equation, including the edge feature of the tumor, the time-signal intensity curve (TIC) type and the apparent diffusion coeffcient (ADC) value when b=500 s/mm2. hTe regression equation was Logit (P)=-21.936+20.478X6+3.267X7+21.488X3.
Conclusion:Valuable indicators in the diagnosis of breast cancer are the edge feature of the tumor, the TIC type and the ADC value when b=500 s/mm2. Combining conventional MRI scan, DWI and dynamic enhanced MRI is a better examination program, while MRS is the complementary program when diagnosis is diffcult.

Objective To explore the values of pixel indexes (PI) with multiple-slice spiral CT low-dose two-phase scanning for assessing the pulmonary function in chronic obstructive pulmonary disease (COPD).Methods Thirty-six patients with COPD (COPD group)and 30 healthy people (control group)underwent pulmonary function test (PFT).Chest 64-MSCT low-dose (50 mAs) scanning at full inspiration and expiration,routine scanning (100 mAs) at inspiration were performed.The effective dose (ED) was calculated.The lung was divided into three regions ( upper,middle,lower).PI of lung were divided into five groups:-960--1024, -910--960, -800--910, -700--800,-400--700.ThePI-910 (sum of the PI under -910 HU) of low-dose scanning at each region were measured and calculated using pulmo software. All PI included PIin-910,PIex-910,PIin-910-PIex-910, PIex-910/PIin-910 and (PIin-910-PIex-910)/PIin-910.All patients underwent PFT within 3 days after 64-MSCT canning,FEV1％ and FEV1/FVC were selected for comparison. Results The PIin in three regions ( - 960 - - 1024,-910 - -960,-800 - -910) were statistically significant between normal and COPD groups( U =0.00,57.00,20.50,P ＜ 0.01 ). The PIex in all regions were statistically significant ( U =0.00,0.00,71.52,191.00,6.00,P ＜ 0.01 ). PI-910--1024 at expiration and inspiration were correlated with FEV1％ and FEV1/FVC( r =- 0.548,- 0.664,- 0.752,- 0.781,P ＜ 0.01 ).PIin -910,PIex -910,PIex-910/PIin -910,( PIin -910-PIex -910 )/PIin -910 had a good correlation with FEV1％ and FEV1/FVC ( r =- 0.548,- 0.664,- 0.752,- 0.781,- 0.674,- 0.642,0.674,0.642,P ＜ 0.01 ).Conclusion Pixel indexes of 64-MSCT low-dose two-phase scanning can be used to evaluate pulmonary function in COPD patients.

Purpose:The efficacy of evaluation of changes of tumoral uptake of 3'-deoxy-3'-[~(18)F] fluorothymidine (FLT) was comparatively analyzed with that of ~(18)F-FDG at early stage after anticancer chemotherapy.Materials and Methods:Cells derived from human lung adenocarcinoma were incubated with cisplatin (CDDP),5-fluorouracil(5-FU),doxorubicin (Dox),for 1,4,24 and 72h.The doses(CD-DP: 67 μM; 5-FU 1,540 μM;MTX: 440 μM;) were determined corresponding to a estimated 10% - 95% proliferation inhibition.The cells were allowed to recover before FLT or FDG being added into the culture media for 60 min.Cell counts,viability,estimated by MTT method,were used to evaluate the cytotoxic effects of chemotherapy.Results: FLT uptake was increased significantly at 1 and 4 h after treatment with 5-FU( 145 ± 12%,150 ± 14%,P <0.01).decreased at 24 h and 72 h.In contrast,FLT accumulation was significantly reduced at cytostatic concentrations of CDDP at different time.The uptake of FDG did not change significantly at early time points after treatment,but decreased at 72 h.Conclusion: The tumor cell uptake of FLT revealed specific changes depending on the auti-cancer drug used at much earlier time than FDG after chemotherpay.

Objective To summarize the use of the CT-guided mandibular angle plastic osteotomy.Methods The clinical data of mandibular angle plastic osteotomy were analyzed under the CT navigation in recent 3 years in our department.Thin-slice CT scans of the mandibular angle were performed before the operation.The CT data were input to the system of neuronavigation.The surgical procedures were then taken under the CT navigation.Results All of patients who received this new technology obtained good plastic effects and safe operation.The anatomic location accurately achieched with short operation time and less bleeding during the operation and distinct curative effect and fast recovery after operation.The effects of the treatment were fine.No visible complications occurred.Conclusions The CT navigation could fix accurately on position of important blood vessels and nerves which could be injured accidentally during operation and,of course,the safety of the operation is improved.The CT navigation can also determine the position and quantities of osteotomy from three dimensional angles,reduce effectively the surgical complications and the risk of surgery,reduce the psychological burden of patients efficiently and increase their confidence and credibility to the operation and surgeons.

OBJECTIVE:To study the hemostatic effect of porcine fibrin sealant patch (DBT) on bleeding wound of liver in rats and gluteus maximus in heparinized rabbits. METHODS:48 rats and 24 rabbits were randomly divided into sham operation group,operation control group (gauze hemostasis),medical collagen sponge group and DBT group. Except for sham operation group,animals in other groups were reduced for rat model with liver bleeding or heparinized rabbit model with gluteus maximus bleeding. The hemostatic time was recorded,bleeding amount was calculated;DBT degradation and wound adhesion in liver after 3,13 weeks were observed;re-bleeding rate of heparinized rabbits in medical collagen sponge group and DBT group were investi-gated. RESULTS:Compared with sham operation group,the hemostatic time and bleeding amount of animals in operation control group were significantly increased(P<0.01). Compared with operation control group,the hemostatic time and bleeding amount of animals in DBT group and medical collagen sponge group were significantly reduced (P<0.01). After 3,13 weeks,different de-gree of adhesion appeared in the wound of rats in each group,while the adhesion scores had no statistical significances(P>0.05). After 13 weeks,liver margin of rats in administration groups was slightly blunt,but it basically had been restored to preoperative state,with good healing. DBT can be degraded and absorbed completely. The re-bleeding rate of rabbits in DBT group were33.3%,66.7% in medical collagen sponge group. CONCLU-SIONS:DBT has good hemostatic effect on fragile organs and the body with blood coagulation dysfunction,and can be de-graded and absorbed. Its effect is equivalent to medical colla-gen,while the adhesive strength is slightly better than the latter.

Objective This paper aims to investigate the application of intraoral scanning and cone beam computed tomography(CBCT)registration implant robot in dental implant surgery.Methods The data of 40 cases with dental de-fect of robot-assisted implantation from November 2023 to May 2024 were retrospectively analyzed.Before the opera-tion,the intraoral scan data and CBCT data of the posi-tioning markers were automatically fused with the initial CBCT images,and the registration error was calculated.The average registration error of positioning markers was determined during the operation,and the implantation ac-curacy was analyzed after the operation.Results The intraoral scan data and CBCT data of 40 patients with dental defect wearing positioning markers were successfully registered with the initial CBCT image,and the registration errors were(0.157±0.026)mm and(0.154±0.033)mm,respectively.Statistical analysis showed no statistical significance between them.The registration errors of the marker was(0.037 3±0.003 6)mm.A total of 55 implants were performed,and the total deviations of the implant point and the apical point were(0.78±0.41)and(0.89±0.28)mm,respectively.The transverse deviations of the implant point and the apical point were(0.44±0.36)and(0.58±0.25)mm,respectively.The depth deviations of the implant point and the apical point were(0.51±0.32)and(0.54±0.36)mm,respectively.The devia-tion of the implant angle was 1.24°±0.67°.Conclusion The fusion technology based on intraoral scanning and CBCT registration can meet the accuracy requirements of preoperative registration of oral implant robots.The technology in-creases the choice of registration methods before robot-assisted dental implant surgery and reduces the multiple radiation exposuresof the patient.

The purpose of this study is to analyze the biomechanics of ankle cartilage and ligaments during a typical Tai Chi movement-Brush Knee and Twist Step (BKTS). The kinematic and kinetic data were acquired in one experienced male Tai Chi practitioner while performing BKTS and in normal walking. The measured parameters were used as loading and boundary conditions for further finite element analysis. This study showed that the contact stress of the ankle joint during BKTS was generally less than that during walking. However, the maximum tensile force of the anterior talofibular ligament, the calcaneofibular ligament and the posterior talofibular ligament during BKTS was 130 N, 169 N and 89 N, respectively, while it was only 57 N, 119 N and 48 N during walking. Therefore, patients with arthritis of the ankle can properly practice Tai Chi. Practitioners with sprained lateral ligaments of the ankle joint were suggested to properly reduce the ankle movement range during BKTS.
Ankle ; Ankle Joint ; Biomechanical Phenomena ; Humans ; Knee Joint ; Lateral Ligament, Ankle ; Male ; Tai Ji