In order to extract the outlines of macular edema from OCT images of macular, and estimate the volume of edema, we have to accurately segment the macular edema region. In this paper, an improved PCNN algorithm was proposed to conduct the above process. Combined with the adaptive base threshold, and the simplified neural network parameters, a binary image of macular edema was produced. According to the principle of maximum image entropy, the optimal number of iterations was determined as 8, which was evaluated by its misclassification rate. Simulation showed that the proposed algorithm could extract the macular edema region rapidly and accurately, providing the basis for further OCT image analysis.
Algorithms ; Fluorescein Angiography ; methods ; Humans ; Macular Edema ; diagnostic imaging ; Radiography ; Tomography, Optical Coherence ; methods

Objective:To understand the present situation of the construction of standardized asthma clinic for children in China, to explore the problems existing in the process of construction, and to promote the healthy development of standardized clinic construction.Methods:The process and current situation of the construction of standar-dized asthma clinics for children in China were reviewed and investigated, and the practical significance of the China Children′s Asthma Action Plan (CCAAP) in the construction of standardized asthma clinics for children was explored.Results:(1)By December 2020, 1 289 standardized asthma clinics for children and 135 regional demonstration centers had been built; 56 training sessions had been held, with a total of 2 560 doctors and 650 nurses trained, covering 2 560 hospitals across the country; and 4 518 patient education sessions were held.Online publicity covers a total of 1 million person-times, with an annual average of 1.33 million patients.(2)CCAAP improved the quality control level of standardized asthma clinic and promoted the standardized management of children.Conclusions:Through process optimization, professional evaluation, individual health education and real-time disease monitoring, standardized asthma clinic for children with asthma can effectively enhance asthma management awareness of children and their parents, improve disease awareness, and promote better control of asthma.It is an effective management model of asthma in children at present, and it is worthy of clinical promotion.CCAAP plays a good role in the construction of standardized outpatient clinic for asthma in children.The construction of standardized asthma clinic for children in China has achieved remarkable results, and the development trend is good in the future.

Objective In order to know the changes of serum pertussis IgG antibody level and the percent-age of white blood cells and lymphocytes in blood routine of children with IgG antibody positive,it is easy to diagnose and treat according to the clinical symptoms and examination results of children.Methods 485 cases of children in Shangdong Provincial Hospital were randomly enrolled as the test subjects,and pertussis anti-body IgG(PT -IgG)detection and blood cell detection were carried out.Results The levels of Pertussis IgG antibody were positive in 90 cases,the positive rate was 18.6%,pertussis IgG antibody level of children aged 8- <10 years old was the highest,2- <4 years old took the second place,10-14 years old were with the low-est levels.Among the patients with positive pertussis antibody levels,white blood cells in total were more than 20×109/L and lymphocyte percentage reached more than 60% in 19 cases,the positive rate was 21.1%,of which 6- <8 years old the highest positive rate was 10-14,the lowest.Conclusion IgG antibody of pertussis incidence is higher in children under 10 years old,the changes of white blood cells and lymphocytes mainly in children under the age of 8,the general course of the disease can be up to 2-3 months,so the need for early diagnosis and treatment,strengthen the immunity of pertussis vaccine is very necessary for children.

Objective:To explore the feasibility and optimization effect of modifying the Henry Ford Hospital (HFHS) RapidPlan model for stereotactic body radiation therapy planning based on local requirements.Methods:The following changes were made based on Henry Ford Health System(HFHS) Rapid Plan Lung SBRT model, taking the latest clinical guideline evidence and local clinical practice into account: Internal gross target volume(IGTV) and organ at risk(OAR) structure, lung, were added and set corresponding parameters.The upper value of planning target volume (PTV) was adjusted from 109% to 125%. The original training library was replaced with 73 local historical simultaneous integrated boosting plans, and statistical verification and outlier cleaning of the initial trained model were performed using Model Analytics software. Totally 10 cases not included in the model library were selected for independent verification, and automatic optimization result of the models before and after modifying were compared under the same beam condition. The following dosimetric parameters were compared after target dose normalization: conformal index (CI) of target volume, the mean doses, maximum doses and dose-volume parameters of OARs.Results:The " tail" of the PTV′s DVH and the " shoulder" and " tail" of the IGTV′s DVH of model M (local) validation plan (M (local)_P) performs higher than the original model HFHS (HFHS_P). The PTV_CI (1.07±0.13) of M local_P were significantly smaller than HFHS_P (1.25±0.24) ( Z=-2.497, P<0.05). Except for Heart_ D15 cm 3 and Heart_ Dmax, most of the M local_P dosimetric parameters of OARs were lower than HFHS_P, and the standard deviation was smaller. However, the difference of between two plans was no more than 3.06%. 10 HFHS_P plans don′t satisfy dose parameters requirement, two of which PTV_CI values are 1.52 and 1.74, far beyond the clinically acceptable range. Conclusions:Commercial model HFHS could be localized by replacing training library and adjusting parameters. Moreover, plans optimized by the modified model are local clinical acceptable in the aspects of target volume conformity and hotspots, and have a better performance in terms of OAR sparing and plan consistency.

Objective:To evaluate the risk factors of clinical cure and biochemical recurrence (BCR) after radical prostatectomy (RP).Methods:The clinical data of 896 patients who underwent RP at Peking University First Hospital from April 2001 to December 2020 were retrospectively analyzed. Average age was (65.90±6.3) years, median preoperative prostate specific antigen (PSA) was 10.75 (0.36-264.20) ng/ml, median prostate volume was 40.0 (12.0-220.9) ml, median PSA density (PSAD) was 0.27 (0.02-3.42) ng/(ml·g). Clinical staging: 432 cases in T 1c stage, 333 cases in T 2a/bstage, 76 cases in T 2c stage, and 55 cases in ≥T 3 stage. Preoperative Gleason score of biopsy: 193 cases in 3+ 3, 315 cases in 3+ 4, 162 cases in 4+ 3, 226 cases in ≥8. The RP surgery was operated by open or laparoscopic or robot-assisted approach. Clinical cure and BCR were used as the end points for analysis. Clinical cure was defined as a decrease in serum PSA level below 0.03 ng/ml 6 weeks after surgery. BCR was defined as the 2 consecutive serum PSA >0.2ng/ml during the follow-up after RP. Multivariate logistic regression was used to analyze the independent risk factors of clinical cure. The Kaplan-Meier method was used to draw the biochemical recurrence-free survival curve, the log-rank method was used for univariate analysis of BCR, and the Cox regression analysis was used for multivariate analysis. Results:All 896 patients were followed-up for 58 (5-241) months, 678 cases (75.7%) achieved clinical cure. Based on univariate analysis and multivariate analysis, among the preoperative indicators, whether the proportion of positive biopsy needles ≥33% ( P=0.007) and preoperative Gleason score of biopsy ( P=0.041) were independent risk factors of clinical cure. A total of 890 cases were included in the analysis of risk factors of BCR, of whom 172 cases (19.3%) had BCR. The 1-, 5-, and 10-year biochemical recurrence-free survival(BFS)rates were 98.1%, 83.1% and 68.4% respectively. The median BFS has not been reached, and the average BFS was 181 months (95% CI 172-189). The results of univariate and multivariate analysis showed that whether achieved clinical cure ( P=0.001) and postoperative pathological staging ( P<0.001) were independent risk factors of BCR. Conclusions:Whether the proportion of positive biopsy needles≥33% and preoperative Gleason score of biopsy were independent risk factors of clinical cure. Postoperative pathological staging and whether achieved clinical cure may be independent risk factors of BCR.

OBJECTIVE: To analyze the clinical efficacy and safety of allogeneic hematopoietic stem cell transplantation (allo-HSCT) for paroxysmal nocturnal hemoglobinuria (PNH), and preliminarily explore the role of an improved post-transplantation cyclophosphamide (PTCy) based conditioning regimen in PNH patients receiving transplantation. METHODS: Clinical related data of PNH sufferers receiving allo-HSCT in Department of Hematology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology were collected, and hematopoietic reconstitution, chimerism, PNH cloning, graft-versus-host disease (GVHD), infection, and survival were analyzed. RESULTS: Totally five PNH patients receiving allo-HSCT were enrolled, including 1 case with classic PNH, 3 cases with aplastic anemia-PNH syndrome, 1 case with myelodysplastic syndrome, three of them (case 1-3) received the improved PTCy based conditioning regimen before HSCT. All sufferers engrafted successfully within 28 days, the median time of neutrophil and platelet engraftment was 11 days and 12 days, respectively, no patient occurred acute or chronic GVHD, after a median follow-up of 16 months, all recipients survived and completely eliminated PNH cloning. CONCLUSION Allo-HSCT can completely clear PNH cloning and restore hematopoietic function with controllable complications, and the improved PTCy based conditioning regimen is proved to be effective in PNH transplantation.
Anemia, Aplastic/therapy* ; Graft vs Host Disease ; Hematopoietic Stem Cell Transplantation ; Hemoglobinuria, Paroxysmal/therapy* ; Humans ; Transplantation Conditioning