With the rapid development of Picture Achieving and Communication System(PACS), the interpretation of medical images has been changing rapidly from a procedure based on films and light boxes to one based on computers and medical displays. The function parameters of Soft-Copy Reading carriers——medical grayscale display play an important part in radiodiagnosis because they can greatly influence the quality of medical image. It is very easy for quantitative assessment of this influence by using ROC curve theory, and it can direct hospital to select suitable medical display.

Objective To evaluate the influence of the resolution of medical grayscale LCD over the detective efficiency of pulmonary nodule.Methods By reviewing PACS, 93 on-line chest DR images were collected.These radiographs included 23 normal images that had no nodule confirmed by CT, 32 doubtful images that also had no nodule confirmed by CT,and 38 positive images that had nodules confirmed by CT.These nodules didn't show obvious calcification and their diameters were from 0.30 to 1.90 cm. Nine patients had multi-nodules.Three residents or postgraduates, three attending physicians, and three associate professors or professors interpreted the 93 chest images by using three types of displays: Barco Z-2261, Barco Z-3620 and Barco Z-5620.All observers evaluated their confidence of the presence of pulmonary nodule with five-point level rating scale : ( 1 ) definitely positive, ( 2 ) probably positive, ( 3 ) uncertain, (4) probably negative, (5)definitely negative.SPSS 11.5 software was used to analyze the results ,including to draw the ROC curves and to perform Z test.Results The areas under the ROC curves of 2 M display, 3 M display and 5 M display were 0.774,0.784,0.816 for experienced radiologists; for instructors were 0.754,0.764,0.768 ;for teaching assistants were 0.695,0.754,0.774.However, for the detection of pulmonary nodules,there was no significant difference between observers with different ranks using the same modality of display,and no significant difference was found between the different modalities of displays used by observers with the same rank.Conclusion It's equivalent for detection performance with 2,3 and 5 M medical grayscale LCD display in detecting pulmonary nodule; Experienced radiologists can get more information using 5 M display;By reasonably matching displays, we could improve the cost-efficacy.

With the rapid development of society and the increasing improvement of living standard,people shows increasing demand for high quality of medical care so that more and more advanced medical instruments are applied to disease prevention,diagnosis and treatment.Thanks to the development of the professional medical technology,a new branch of medicine-clinical engineering has emerged.The history,current situation and future development of clinical engineering are mainly expounded.

Objective Evaluate the influence of medical monochrome liquid crystal display (LCD) with different resolutions on the detection of pulmonary nodules.Methods Ninety-three direct digital radiography (DR) chest images were selected on-line from picture archiving and communication system (PACS),including 38 positive,32 suspected and 23 normal cases.All of the images were confirmed by CT.These positive images were divided into group A and B according to the diameter of nodules.Three experienced radiologists blindly read the 93 images using three types of displays with different resolutions.Regarding the presence of nodule,five-point confidence system was used:definitely absent,probably absent,indefinite,probably present and definitely present.All observers marked their confidence levels of each image according to the presence of pulmonary nodule on different displays.Software SPSS 13.0 was employed for statistical analysis.Results In the group-A cases,the areas under ROC curves were 0.643,0.686 and 0.739,and in the group-B cases,those were 0.813,0.832 and 0.846 respectively.There was no difference in the detection efficacy among different radiodiagnostic systems.Conclusion Regardless of post-processing tools,it was equivalent to detect pulmonary nodules with different diameters of Group A or B among medical monochrome LCDs with different resolutions.

Objective: Evaluate the influence of monochrome LCDs with different resolutions for the quality of detail imaging and detection performance of lesions. Methods: 93 DR chest images were selected from PACS on-line, including 38 positive cases, 32 suspected cases and 23 normal cases. The positive cases were divided into two groups A and B according the diameter of pulmonary nodules. Three of high-, mid-and low-experienced radiologists interpreted the 93 images on three types of displays independently. Each observer marked their confidence of the presence of pulmonary nodule with five-point rating scale : (1)definitely absent, (2)probably absent, (3)possibly present, (4)probably present and (5)definitely present, and the visual quality of lung markings with three-point rating scale:(1) excellent, (2)free, (3) inferior. Software SPSS 13.0 was used to analyze the results. Results: For the detection performance of lesion, while detecting nodules of Group A, the areas under ROC curves were 0.643、0.686、0.739 on 2MP、3MP and 3MP display for high-experienced radiologist. Those were 0.636、0.682、0.717 for mid-experienced radiologist and 0.623、0.656、0.721 for low-experienced radiologist; while detecting nodules of Group B, those were 0.813、0.832、0.846 for high-experienced d radiologist, 0.773、0.824、0.838 for mid-experienced radiologist and 0.763、 0.7.73、0.833 for low-experienced radiologist. There were no significant differences among detection performance ofradiodiagnostic systems. For the quality of detail imaging, while interpreting the visualization of lung markings, the difference between high-and mid-experienced radiologist or between high-and low-experienced radiologist on 5MP display was conspicuous (P<0.05). But the differences of other comparisons did not reach the significant level. Conclusions: For the detection performance ofpulmouary nodules, it is comparable among different radiodiagnostic systems; for the visualization of lung markings, high-experienced radiologist could get more information on 5MP display.

Perfofinance of the radio-diagnostic system can be evaluated quantitatively by the analysis method of the ROC curve.Areas under the ROC curves represent the diagnostic perfogrmance efficiency.A comparison of the perforrmance variance of the diagnostic system incurred by different diagnosticians,will find the diagnostic competence of individual diagnosticians.This can help hospital management in deploying personnel in the department of radiology reasonably.

Objective To assess the influence of medical monochrome liquid crystal displays (LCD) with different resolutions for the detection performance of micro-nodules (diameter <10 mm) on chest radiograms. Methods Eighty-seven DR chest images that were verified with CT were selected from PACS on-line, including 32 positive images, 32 suspected images and 23 normal images. The diameters of all nodules were lower than 10 mm. Three of high-, mid- and low-experienced radiologists who participated in the ROC study interpreted these 87 images using three types of LCDs with different resolutions, respectively. Regarding the presence of nodule, five-point confidence level rating scale was used, i.e. definitely absent, probably absent, possibly present, probably present and definitely present. All observers marked their confidence levels of every image according to the presence of pulmonary nodule on different displays. Software SPSS 13.0 was used for statistical analysis. Results AUC increased with the increasing resolutions and radiologists' experiences in 2MP, 3MP, 5MP displays. For the detection performance of pulmonary nodules (diameter <10 mm), there was no significant difference among different types of displays or different aptitudes of radiologists. Conclusion It's equivalent for the detection performance of pulmonary nodule (diameter <10 mm) on 2MP, 3MP and 5MP medical monochrome LCD when no restriction on the use of image post-processing tools. Highly-experienced radiologist can get the most information when using 5MP display. It is advisable to combine the diagnostic workstation system with high-, mid- and low-resolution monitors, and reasonable equipment scheme between different types of displays and different aptitudes of radiologists could result in better cost-efficacy.

The medical imaging technology (MIT) specialty hasn't been set up for a long time in China, and the mode of educating students in other institutions vary greatly among different universities. There are several disadvantages in MIT specialty set up in the Affiliated hospitals of universities, such as unreasonable curriculum system, imperfections in teaching and research department, and inadequate guidance on students' innovation ability. Therefore, the solutions for alleviating the above problems that are unfavorable factors to education are proposed, so as to further improve the model of MIT specialty set up in the affiliated hospitals of universities and produce more competent graduates.

The emerging and re-emerging arthropod-borne infectious diseases pose a serious threat to global public health security. Field and laboratory studies of arthropods of medical importance are essential and critical for the prevention and control of arthropod-borne infectious diseases. Various institutions or universities in China have been conducting research in the field or laboratory study of arthropods of medical importance, but up to 2023, it is still lacking detailed biosafety guidelines or recommendations that can guide the related work for arthropods of medical importance. In order to proactively address potential biosafety issues in the field or laboratory activities related to arthropods of medical importance, improve the standardization of arthropod biosafety classification, operations, and protection, and ensure the safety of practitioners, an expert consensus on the biosafety recommendation of arthropods of medical importance in field and laboratory has been developed, aiming to guide the future work of arthropods and ensure the national biosafety and biosecurity of China.

Objective To investigate the correlation between serum microRNA(miR)-24-3p,microtubule affinity-regulating kinase 4(MARK4)level expression and cardiac function in serum of patients with coronary atherosclerotic heart disease(CHD).Methods From August 2021 to April 2023,138 CHD patients who visited Sichuan Provincial People's Hospital were collected as the study subjects(CHD group).According to the New York Heart Association(NYHA)grading,patients in the CHD group were separated into grade Ⅱ(n=39),grade Ⅲ(n=68),and grade Ⅳ(n=31).Additionally,123 individuals who underwent physical examinations were selected as the health group during the same period.Real-time fluorescence quantitative PCR(qRT-PCR)method was applied to detect the expression levels of miR-24-3p and MARK4.Cardiac function indicators in the CHD and health groups were detected.Pearson method was applied to analyze the correlation among serum miR-24-3p,MARK4,and cardiac function indicators.Results Compared with the healthy group,the levels of MARK4(1.19±0.21 vs 1.00±0.20),left ventricular end-systolic dimension(LVESd),left ventricular enddiastolic dimension(LVEDd),interventricular septal thickness(IVS),left ventricular end-diastolic volume(LVEDv),left ventricular end-systolic volume(LVESv),and left ventricular mass(LV mass)in the CHD group were increased(t=7.462,18.242,23.888,9.941,2.812,12.520,11.029),while the levels of miR-24-3p(0.62±0.11 vs 1.00±0.18),left ventricular ejection fraction(LVEF),and cardiac output(CO)were reduced(t=20.821,10.212,18.188),and the differences were statistically significant(all P＜0.05).As cardiac function grading increased,MARK4 expression levels(1.09±0.19,1.18±0.17,1.32±0.22),LVESd,LVEDd,IVS,LVEDv,LVESv and LV mass were increased(F=13.025,10.606,11.920,57.956,29.680,21.253,12.954),and miR-24-3p expression levels(0.84±0.15,0.61±0.11,0.37±0.08),LVEF and CO were decreased(F=139.227,9.720,13.411),and the differences were statistically significant(all P＜0.05).Pearson correlation analysis showed a negative correlation between miR-24-3p and MARK4 expression in the serum of patients with CHD(r=-0.540,P＜0.05).The relative expression of miR-24-3p in the serum of patients with CHD was negatively correlated with LVESd,LVEDd,IVS,LVEDv,LVESv and LV mass(r=-0.656,-0.636,-0.617,-0.576,-0.492,-0.687,all P＜0.05),but positively correlated with LVEF and CO(r=0.570,0.683,all P＜0.05).The relative expression level of MARK4 was positively correlated with LVESd,LVEDd,IVS,LVEDv,LVESv,and LV mass(r=0.503,0.542,0.508,0.624,0.516,0.560,all P＜0.05),but negatively correlated with LVEF and CO(r=-0.594,-0.525,all P＜0.05).Conclusion The expression of miR-24-3p in the serum of CHD patients was decreased,while the expression of MARK4 was increased.There was an obvious correlation between the two and cardiac function indicators.