Objective To assess the dose reduction potential of adaptive statistical iterative reconstruction(ASiR)and model-based iterative reconstruction(MBIR)in pelvic CT with a standard male phantom.Methods A Fluke Biomedical RANDO standard male phantom was scanned with discovery CT750 HD using different tube currents.CT images were reconstructed with FBP,50％ASiR and MBIR.The CT value,the image noise and the contrast-to-noise ratio(CNR)for the sacral vertebra relative to muscle were measured.The volume CT dose indexes(CTDIvo1)and dose-length product(DLP)were recorded.Results Compared with FBP,using 50％ASiR and MBIR had significant reduced image noise and greater CNR.The effective minimal tube currents for displaying sacral vertebra were 250 mA(FBP),180 mA(50％ASiR),and 100 mA(MBIR).With the similar image quality using FBP,the dose was reduced by 28.0％ and 59.9％ using 50％ASiR and MBIR,respectively.Conclusions Using advanced iterative algorithms can reduce image noise,improve CNR,and reduce the radiation dose in pelvic CT examination.

Objective To investigate the clinical value of 18 F-FDG PET CT scan in the diagnosis of thin lung nodules. Methods 56 solitary cases of nodules in the lungs,nodule size ranged from 1～3 cm,conducted 18 F-FDG PET/CT imaging and thin layer CT scan at the same time, 18 F-FDG PET imaging using visual measurement combined with semi-quantitative method to determine the degree of malignant of the lesions; conducted MPR recon-struction after thin layer CT scan, based on the lesions morphology to determine the degree of malignant. Then com-pared the results of above,and the results of the combination of 18 F-FDG PET imaging and thin layer CT scan,with the pathological results after surgery. Results The sensitivities of PET imaging alone,thln layer CT alone,joint ima-ging diagnosis of SPN are 92.6% ,88.2% ,96.4% ,specificity are 73.3% ,57.1% ,85.7% ,accuracy percentage rate are 89.3% ,80.4% ,94.6% ,the positive predictive values are 92.6% ,91.8% ,96.4% ,and negative predictive val-ues are 84.6% ,61.5% ,92.3% ,respectively. Conclusion 18 F-FDG PET combined with thin layer CT scanning is a very effective method to clinical diagnosis the malignant degree of SPN.

Objective:To observe the clinical efficacy of skin needling plus heat-sensitive moxibustion in treating chronic facial paralysis. Methods:Sixty patients with chronic facial paralysis were divided into an observation group and an acupuncture group by using the random number table, 30 in each group. Patients in the observation group were given skin needling plus heat-sensitive moxibustion; while patients in the acupuncture group were given conventional acupuncture. Results:Three treatment courses later, the total effective rate was 93.3% in the observation group versus 86.7% in the control group, and the difference was statistically significant (P<0.05). Conclusion:Skin needling plus heat-sensitive moxibustion can produce a more significant efficacy than conventional acupuncture in treating chronic facial paralysis.

Objective To observe the clinical efficacy of fire acupuncture plus herbal medicine in treating acute gouty arthritis. Method Eighty-nine patients with acute gouty arthritis were randomized into a treatment group of 45 cases and a control group of 44 cases. The treatment group was intervened by fire acupuncture plus orally taking herbal medicine, while the control group was by oral administration of Diclofenac sodium and Allopurinol. The average pain score was observed before and after intervention, and the clinical efficacies were compared between the two groups.Result The total effective rate was 95.6% in the treatment group versus 81.8% in the control group, and the difference was statistically significant (P<0.05). The average pain score was significantly changed in both groups after intervention (P<0.01). After treatment, there was a significant difference in comparing the average pain score between the two groups (P<0.05).Conclusion Fire acupuncture plus herbal medicine is an effective approach in treating acute gouty arthritis.

Leukemia inhibitory factor (LIF) plays important roles in varieties of biological processes. This factor is highly conserved in mammalian animals and only one heterozygous LIF mutation was reported to cause the infertility of women. A LIF mutation was generated and the evidences were provided that the mutation of mature LIF at the 29th amino acid totally abolished its functions, including stimulation of STAT activation assayed by Luciferase reporter gene expression and EMSA experiments. In addition, the mutated LIF failed to inhibit the proliferation of M1 cells. The data indicated that the mutation of LIF did not have a dominant negative effect but lost the biological functions, suggesting that the 29th amino acid is critical for maintaining the activities of LIF.

Objective:To develop a novel method for detection of genomic RNA of 2019-nCoV with reverse-transcription thermophilic helicase-dependent amplification (tHDA) and lateral flow dipsticks.Methods:This study included 143 PCR-negative nucleic acid specimens and 20 PCR- positive nucleic acid specimens collected from patients from January to April 2020 at Institute of Clinical Laboratory, Jinling Hospital. 5 pairs of primers were designed for conserved sequence of both gene N and E of 2019-nCoV, and the amplicons were analyzed by gel electrophoresis to screen out the most efficient primers. High level (5×10 5 copies/ml) and low level (5×10 2 copies/ml) templates were amplified, and lateral flow dipsticks (LFD) were used to detect amplification products. The amplification time and visualization time were optimized to visualize the results, and the optimal tHDA-LFD reaction system was established. Simulated specimens with low, medium, and high concentrations were detected for 15 times, and precision was assessed. The limit of detection was evaluated using tenfold serial dilutions of 2019-nCoV in contrived samples. To evaluate the cross-reactivity, six samples of respiratory viruses, including influenza A virus, influenza B virus, human adenovirus, human respiratory syncytial virus, human parainfluenza virus and coronavirus 229E were tested using this assay. The tHDA-LFD assay was performed to detect 2019-nCoV in 163 clinical specimens stored in our laboratory. The clinical diagnostic efficacy was determined. Results:The established RT-tHDA one-step method combined with LFD was adopted, which could be conducted within 60 min and was reproducible with good precision, showing 100% positive concordance rate. The assay showed no cross reaction with other six human respiratory pathogens. The limit of detection of the RT-tHDA assay was 5×10 2 copies/ml for both N and E genes detected by LFD. The diagnostic efficacy evaluation showed that the sensitivity of the method was 95.00%(19/20), and the specificity was 100.00%(143/143). The positive predicted value of the method was 100.00% (19/19)and the negative predicted value was 99.31%(143/144). Compared with real-time RT-qPCR assay, it showed Kappa value of 0.971 ( P<0.0001). Conclusion:The proposed tHDA-LFD assay is a rapid and visualized method to detect 2019-nCoV.

Objective To investigate the clinical characters and therapy of primitive neuroectodermal tumor(PNET).Methods A retrospective analysis was conducted.A 36-year-old female patient was showed pain and numbness of the right upper limb and back for 6 months.The cervical spine MRI showed a spindleshaped intradural mass right ventrolateral of spinal cord at C5-7 with in homogeneously enhancing.Surgery and pathologic examination confirmed that was PNET.Combiled with a series of literatures to analyse the clinical characters Results Surgery was performed to remove the tumor and decompression combined with radiotherapy.The pathologic examination and immunohistochemical analysis revealed that it was PNET.MRI identified local recurrence in spinal canal at 3 month later after surgery.Conclusion Spinal PNET is an uncommon intraspinal tumor with poor prognosis.Histopathology is the evidence of diagnosis.Optimal therapy has not yet been found.Surgical resection with the combination of chemo-radiotherapy or radiotherapy might get the better outcomes.Multidisciplinary treatment should be further clinical required.

Objective To explore the mechanism and inhibition of botulinum toxin type A (BTXA) on hypertrohic scar fibroblasts.Methods The cells were treated by 0 (control),0.2,0.4,0.8 U/ml BTXA for 48 h.Cell viability was detected by MTT assay.Cell apoptosis was detected by Hoechst staining.Cell cycle was detected by flow cytometry.The level of cell cycle related protein D1 (Cyclin D1),proliferation nuclear antigen (PCNA) and activation of phosphatidylinositol 3 kinase (PI3K) / protein kinase B (AKT) signaling pathway were assayed by western blot.Results Compared with control group(0.75±0.07),0.2,0.4,0.8 U/mL BTXA(0.59 ± 0.06,0.43 ± 0.04,0.34± 0.03) inhibited hypertrohic scar fibroblasts cell viability,increased cell apoptotic rate[control group(2.38±0.24)％;BTXA(15.79±1.54)％,(27.32±2.69)％,(38.46±3.90)％],down-regulated the expression of Cyclin D1(control group 1.57±0.18;BTXA 0.93±0.07,0.42±0.04,0.35±0.03) and PCNA(control group 1.46±0.16;BTXA 0.50±0.05,0.59±0.05,0.37±0.03),inhibited the expression of PI3K(control group 0.98±0.06;BTXA 0.49±0.04,0.50±0.04,0.39±0.03) and the phosphorylation of AKT(control group 1.38±0.08;BTXA 0.97±0.06,0.60±0.04,0.29± 0.02),made cell cycle arrested in G1 phase,The difference was statistically significant (P＜0.05).Conclusion These results suggested BTXA inhibit proliferation via blocking the activation of PI3K/AKT signal pathway and down-stream related cell cycle related protein.

Objective Respiratory viruses are the most common pathogens to cause respiratory tract infection in infants and children.The aim of the study was to establish a luminex-based molecular assay for rapid detection of four kinds of common respiratory viruses and provide measures for effective prevention and control . Methods 120 throat swab samples from patients with acute respiratory tract infection were collected in our hospital as disease group.30 normal specimens were used as control group .Specific up-stream and downstream primers , hybridization probes and super prim-ers were designed on the basis of conserved sequences of Influenza A and B viruses( FluA, FluB), respiratory syncytial virus types A and B ( RSVA, RSVB ) from available respiratory-virus sequence data-base.Recombinant plasmid and in vitro transcription RNA positive reference substances were established respectively .The testing sys-tem of Tem-PCR combined with luminex xMAP was built by amplification and optimization of hybridization .Comparative analysis were made between the detection results of the above method and those of single viral gene real -time PCR assay and luminex xTAG assay re-spectively. Results Rapid molecular assay was established to specifically detect the four kinds of respiratory viruses (FluA, FluB, RSVA and RSVB) with the sensitivity of 10 copies/μL.Rapid molecular assay and single viral real-time PCR assay were utilized to de-tect the throat swabs ( n=120 ) from suspected patients , the positive result of the former was 31 .7% ( 38/120 ) and the latter was 29.2%(35/120).The consistency test result indicated the two methods were consistent without a significant difference (k>0.7). Several samples were detected by luminex xTAG assay simultaneously , in which good consistency and significant difference were found in two assays by statistical analysis (k>0.6). Conclusion Preliminary clinical application has confirmed the novel molecular assay is sensitive, specific and rapid in simultaneous detection of FluA , FluB, RSVA and RSVB respiratory viruses , which provides experi-mental basis for accurate diagnosis of infected pathogens at early clinical stage .

Objective To explore a method for earlier evaluating death toll based on a function relationship ( an increasing hour-increasing death index ( K value) followed with time (T) changing after catastrophic earthquake. Methods Information data of 10 typical occurrences of catastrophic earthquake obtained from China International Search and Rescue Team (CISAR) were analyzed. Total deaths were estimated according to the simulation function made by hour-increasing death index (K value) followed with time (T) changing. Expected value of the simulation function was assessed by statistical software SPSS version 17.0 to establish the model of simulation function.Results The length of time (T) to reach K maximum (Kmmax) was ( 12.94 ± 8.18) h and then the K value was gradually decreased. Kmax was symmetrically scattered within 2 T time.Estimated death toll (W) within 2 T was obtained from calculating the integration summation of the function to get a formula as W =∫∞ kf(t) dt.This Estimated death toll(W) numbers was correlated approximately with the death toll (M) from authoritative report (P ＜ 0.01 ).According to the regression analysis of model simulation curve,the predictive function of death toll within 2 T was M =W1.23 ×0.194.A determinant coefficient of this power function R2 was 0.88. Conclusions Earlier estimating death toll within about 12 h should be carried out by using the data of real-time information report system.