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Objective To analyze the results of acceptance testing of 60 extraoral dental X-ray equipment in Beijing, China from 2021 to 2022, and understand the main types and performance parameters of newly installed extraoral dental X-ray machines in the clinical market of Beijing, as well as the level of installation and trial run of the whole machine by various manufacturers, and to summarize the problems found in acceptance testing for improving equipment testing. Methods Field acceptance testing and evaluation were carried out according to the Specification for Testing of Quality Control in Medical X-Ray Diagnostic Equipment (WS 76—2020). Results The overall qualified rate of 60 extraoral dental X-ray equipment was 98.33%. Under the same condition of the same tube voltage for one dental equipment, the maximum deviation of the tube voltage indicated by the two modes (panorama and skull) is 5.5%, and the maximum difference of the half-value layer of the useful beam is 1.22 mm Al. There is also a certain difference between the exposure time indicating deviation from the panorama and the skull, with a maximum difference of 75.51%. Conclusion Strengthening ex-factory quality control, installing, and debugging of equipment can basically guarantee the performance of newly installed equipment. In the testing process, it is critical to ensure the effective point of measurement of the dose detector located on the central axis of the primary beam.
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Seed quality plays an important role in the agricultural and animal husbandry production, the effective utilization of genetic resources, the conservation of biodiversity and the restoration and reconstruction of plant communities. Seed aging is a common physiological phenomenon during storage. It is a natural irreversible process that occurs and develops along with the extension of seed storage time. It is not only related to the growth, yield and quality of seed and seedling establishment, but also has an important effect on the conservation, utilization and development of plant germplasm resources. The physiological mechanisms of seed aging are complex and diverse. Most studies focus on conventional physiological characterization, while systematic and comprehensive in-depth studies are lacking. Here we review the recent advances in understanding the physiology of seed aging process, including the methods of seed aging, the effect of aging on seed germination, and the physiological and molecular mechanisms of seed aging. The change of multiple physiological parameters, including seed vigor, electrical conductivity, malondialdehyde content and storage material in the seed, antioxidant enzyme activity and mitochondrial structure, were summarized. Moreover, insights into the mechanism of seed aging from the aspects of transcriptome, proteome and aging related gene function were summarized. This study may facilitate the research of seed biology and the conservation and utilization of germplasm resources.
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Germinación , Plantas , Proteoma , Plantones , Semillas/genéticaRESUMEN
OBJECTIVE To provide reference for the optimization of development policy of traditional Chinese medicine. METHODS ROSTCM text mining analysis software was adopted to screen the literature preliminarily ，the PMC policy index model was built ，and the results by PMC index and visual PMC surface were analyzed. RESULTS & CONCLUSIONS A total of 33 policies related to traditional Chinese medicine were included ，and 10 primary variables and 46 secondary variables were set. The average PMC index of 33 policies was 6.15，of which 2 were excellent policies and the rest were good policies. Among the primary variables ，the scores of policy openness ，policy evaluation and policy field were relatively high ，while the scores of release time ，policy level and policy type were low. The analysis of sink index and secondary variables showed that the macro planning of national policies was not specific enough in terms of policy objectives and contents ，with low score ，while the local policies were usually planned in detail. Generally speaking ，there is still much room for improvement in the policies related to the development of traditional Chinese medicine in terms of policy system construction ，government investment ，talent construction ， financing supporting policies ，market access rules ，responsible subjects and legal guarantee.
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Objective@#To explore the value of magnetic resonance imaging (MRI)-based whole tumor texture analysis in differentiating borderline epithelial ovarian tumors (BEOTs) from FIGO stage I/II malignant epithelial ovarian tumors (MEOTs). @*Materials and Methods@#A total of 88 patients with histopathologically confirmed ovarian epithelial tumors after surgical resection, including 30 BEOT and 58 MEOT patients, were divided into a training group (n = 62) and a test group (n = 26).The clinical and conventional MRI features were retrospectively reviewed. The texture features of tumors, based on T2-weighted imaging, diffusion-weighted imaging, and contrast-enhanced T1-weighted imaging, were extracted using MaZda software and the three top weighted texture features were selected by using the Random Forest algorithm. A non-texture logistic regression model in the training group was built to include those clinical and conventional MRI variables with p value < 0.10. Subsequently, a combined model integrating non-texture information and texture features was built for the training group. The model, evaluated using patients in the training group, was then applied to patients in the test group. Finally, receiver operating characteristic (ROC) curves were used to assess the diagnostic performance of the models. @*Results@#The combined model showed superior performance in categorizing BEOTs and MEOTs (sensitivity, 92.5%; specificity, 86.4%; accuracy, 90.3%; area under the ROC curve [AUC], 0.962) than the non-texture model (sensitivity, 78.3%; specificity, 84.6%; accuracy, 82.3%; AUC, 0.818). The AUCs were statistically different (p value = 0.038). In the test group, the AUCs, sensitivity, specificity, and accuracy were 0.840, 73.3%, 90.1%, and 80.8% when the non-texture model was used and 0.896, 75.0%, 94.0%, and 88.5% when the combined model was used. @*Conclusion@#MRI-based texture features combined with clinical and conventional MRI features may assist in differentitating between BEOT and FIGO stage I/II MEOT patients.
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Objective:To analyze the risk factors of postinflammatory hyperpigmentation (PIH) after laser in the treatment of acquired bilateral nevus of Ota-like macules (ABNOM).Methods:A retrospective study was conducted to follow up 120 patients with acquired bilateral nevus of Ota-like macules in the Department of Laser and Physiotherapy, Guangzhou Institute of Dermatology between January 2011 and December 2018, which accepted 1064-nm Q-switched neodymium: yttrium-aluminum-garnet laser treatment. The difference was analyzed between different age, sex, clinical classification, Fitzpatrick skin classification, ABNOM with melasma and postinflammatory pigmentation after laser treatment. Logistic regression was used to analyze the risk factors of postinflammatory hyperpigmentation after 1064-nm Q-switched neodymium: yttrium-aluminum-garnet laser treatment of acquired bilateral nevus of Ota-like macules.Results:Fifty-three ABNOM patients (44.17%) developed PIH after laser treatment. Univariate analysis showed that age, clinical classification, Fitzpatrick skin classification and the patients with both ABNOM and melasma all affected the occurrence of PIH after laser in the treatment of ABNOM, and the difference was statistically significant ( P<0.01). Logistic regression showed that older age, more severe clinical classification and the presence of ABNOM with melasma were the risk factors of PIH after treatment of ABNOM. Conclusions:ABNOM patients should be treated as early as possible. The risk of inducing PIH is great after laser treatment in patients with more severe clinical classification and patients with both ABNOM and melasma.
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Active exploration for building a model of medical alliances fitting local needs, proves imperative for the functional positioning of medical institutions, promoting inter-institutional cooperation and enhancing the capacity of primary medical services. The authors described experiences and insights of the No.1 Affiliated Hospital and the People′s government of Quangang District in their partnership, and building a brand new model of medical alliance between a hospital and a local government. Also presented are characteristics of such a model, and analysis of operational data in benefiting the people. They held that such a partnership is a worthy attempt in the healthcare reform, by means of building medical alliances between local government and provincial hospitals. Such a practice can provide valuable references for promoting government-hospital synergy, elevating primary healthcare capacity and advancing the hierarchical medical system.
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Objective To investigate the surgical effort of transurethral bipolar plasma kinetic resection (PKR-BT) on who cannot tolerate radical cystectomy in elderly patients with high-risk infiltration bladder urothelial cancer.Methods From 2010 January to 2013 September,data from 27 cases of elderly had been reviewed.The risk of invasive bladder urothelial cancer were treated with PKR-BT treatment.All patients met WHO elderly standards in this group of patients with severe diabetes was 7 cases,and other comlications.Results All 27 patients had been successful in operation and postoperative recovery.Patients were followed up for 4-45 months,8 cases occured recurrence,6 cases of PKR-BT again,2 cases missed,complete follow up 25 patients still survived,the median follow-up time was 23.6 months,the longest survival was 45 months.Conclusion PKR-BT in the treatment of invasive bladder urothelial cancer patients is safe and effective,it can be used as one of the alternate treatment for such patients.
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Objective To investigate the CT characteristics of anaplastic thyroid carcinoma and evaluate the diagnostic value of CT in this disease.Methods The CT findings of 10 patients with pathologically proved anaplastic thyroid carcinoma were retrospectively reviewed.The patients included 7 females and 3 males.Their age ranged from 25.0 to 78 years with median of 61 years.Multi-slices plain and post contrast CT scans were performed in all patients.Results Unilateral thyroid was involved in 6 patients.Unilateral thyroid and thyroid isthmus were both involved in 2 patients due to big size.Bilateral thyroid were involved in 2 patients.The maximum diameter of anaplastic thyroid carcinoma ranged from 2.9-12.8 cm with mean of (4.5 ± 1.4) cm.All lesions demonstrated unclear margins and envelope invasion.The densities of all lesions were heterogeneous and obvious necrosis areas were noted on precontrast images.Seven lesions showed varied calcifications,and coarse granular calcifications were found in 5 lesions among them.All lesions showed remarkable heterogenous enhancement on post-contrast CT.The CT value of solid portion of the tumor increased 40 HU after contrast media administration.The ratios of CT value which comparing of the tumor with contralateral sternocleidomastoid muscle were 0.69-0.82 (0.76 ± 0.18)and 1.25-1.41 (1.33 ± 0.28)on pre and post CT,respectively.Enlarged cervical lymph nodes were found in 6 cases (60.0％).It showed obvious homogeneous enhancement or irregular ring-like enhancement on post-contrast images and dot calcifications were seen in 1 case.Conclusions Relative larger single thyroid masses with coarse granular calcifications,necrosis,envelope invasion,remarkable heterogeneous enhancing and enlarged lymph nodes on CT are suggestive of anaplastic thyroid carcinoma.