Recent studies have introduced attention models for medical visual question answering (MVQA). In medical research, not only is the modeling of “visual attention” crucial, but the modeling of “question attention” is equally significant. To facilitate bidirectional reasoning in the attention processes involving medical images and questions, a new MVQA architecture, named MCAN, has been proposed. This architecture incorporated a cross-modal co-attention network, FCAF, which identifies key words in questions and principal parts in images. Through a meta-learning channel attention module (MLCA), weights were adaptively assigned to each word and region, reflecting the model’s focus on specific words and regions during reasoning. Additionally, this study specially designed and developed a medical domain-specific word embedding model, Med-GloVe, to further enhance the model’s accuracy and practical value. Experimental results indicated that MCAN proposed in this study improved the accuracy by 7.7% on free-form questions in the Path-VQA dataset, and by 4.4% on closed-form questions in the VQA-RAD dataset, which effectively improves the accuracy of the medical vision question answer.
In order to conduct surface monitoring of the three-dimensional spine morphology of the human body in daily life, a spine morphology measuring method using "single camera, multi-view" to construct stereo vision is proposed. The images of the back of the human body with landmarks of spinous process are captured from multiple angles by moving a single camera, and based on the "Zhang Zhengyou calibration method" and the triangulation principle of binocular stereo vision, the spatial conversion matrices corresponding to each other between all images and the 3D coordinates of the landmarks are calculated. Then the spine evaluation angle used to evaluate the spine morphology is further calculated. The tests’ results showed that the spine evaluation angle error of this method is within ±3°, and the correlation between the results and the X-ray film Cobb angles is 0.871. The visual detection algorithm used in this paper is non-radioactive, and because only one camera is used in the measurement process and there is no need to pre-set the camera's shooting pose, the operation is simple. The research results of this article can be used in a mobile phone-based intelligent detection system, which will be suitable for the group survey of scoliosis in communities, schools, families and other occasions, as well as for the long-term follow-up of confirmed patients. This will provide a reference for doctors to diagnose the condition, predict the development trend of the condition, and formulate treatment plans.
Objective To observe the functional state of the optic nerve and discover the injury of visual pathway function in time under general ane sthesia. The flash visual evoked potential (F-VEP) was used to monitor visual function during orbital surgery. Methods A total of 252 out of 282 patients undergoing orbital surgery under general anesthesia were successfully monitored by F-VEP during the surgery. All patients were monitored by this method under the following conditions:consious state before operation, under general anaesthesia, during and after dissection of orbital tumor and at the end of operation. Results ①There was no significant difference of wave amplitude and latency under general anesthesia and consciousness condition. ②The amplitude and latency of F-VEP were normal in the orbital surgery withou toptic nerve injury. ③Pulling and oppression of optic nerve could cause temporary wave loss, but the wave recovered after removal of the pull and oppression. ④ The wave loss of F-VEP would occur immedicately when optic nerve was severe injured and its blood supply was deficient. Since the application of the visual function monitoring, 24 cases were treated in time during disturbance of visual function and no patient has unexpected visual loss during orbital surgery. Conclusion The intraoperative monitoring of F-VEP during orbital surgery can decrease the proportion of permanent visual loss caused by orbit al surgery, and help the surgical procedures go to function-anatomy stage from experience-anatomy stage. (Chin J Ocul Fundus Dis, 2001,17:260-263)
Objective To investigate the characteristic of the multifocal visual evoked potentials(MVEP)and the visual function across the visual field in anisometropic amblyopes and isometropic amblyopes. Methods MVEP from 32 anisometropic amblyopic eyes and 31 control eyes were tested. Results In anisometropic amblyopic eyes,the latencies of MVEP were significantly prolonged．The amplitudes of MVEP were significantly attenuated in the central region of the visual field,and these phenomena gradually reduced with the increase of the eccentricity． Conclusion The visual function of anisometropic amblyopic eyes is reduced more significantly in the central region than in the peripheral region of the visual field. (Chin J Ocul Fundus Dis,20000,16:27-29)
purpose To study the visual electrophysiological changes in patients with chronic glomerulonephritis. Methods The visual evoked potentials(VEP) and electroretinogram(ERG) of 26 subjects with chronic glomerulonephritis in 51 eyes were recorded. Results Ours studies showed the patients with chronic glomerulonephritis had pathologic visual electrophysiologic abnormalities.The N 75 peak latency,b wave peak latency O 1 peak latency and total amplitude of OPs in chronic glomerulonephritis patients without fundus sign showed remarkable difference. Conclusion These changes suggested visual electrophysiological examination may be valuable in early diagnosis of retinal disfunction in patients with chronic glomerulonephritis. (Chin J Ocul Fundus Dis,1998,14:162-164)
目的 探讨局麻下经胸前入路行腔镜甲状腺手术的体会。方法 对2009年3月至2010年3月期间四川省南充市中心医院普外科收治的28例在局麻下行腔镜甲状腺手术患者术中及术后情况进行回顾性分析。结果 1例因术中冰冻检查发现为甲状腺癌而转开放性手术未纳入分析。视觉模拟镇痛评分（VAS）: 术中评分结果为0～5分，平均2.2分; 术后评分结果为0～3分，仅2例口服布洛芬缓释胶囊镇痛，其余25例未使用镇痛药物。手术时间为95～215 min，平均117 min; 术中出血量为50～150 ml，平均84 ml。术后引流量为25～70 ml，平均34 ml； 引流管放置时间为2～4 d。住院时间平均4.5 d。术后颈部及胸壁皮下无瘀血、肿胀，无声嘶、呛咳。经随访2~10个月（平均8个月），未见切口处明显瘢痕。结论 局麻下经胸前入路行腔镜甲状腺手术切实可行，并具有良好的美容效果。
目的 观察酒石酸布托啡诺与芬太尼合用于术后静脉自控镇痛（PCIA）的效果及最佳混合比例。 方法 2010年8月－2011年1月100例妇科手术患者，随机分为5组，每组20例。均全身麻醉术后采用负荷量+持续背景剂量+PCIA方案镇痛。根据不同配方分为F组：芬太尼1 mg+生理盐水至100 mL；B组：酒石酸布托啡诺10 mg+生理盐水至100 mL；BFⅠ组：芬太尼0.6 mg+酒石酸布托啡诺3 mg+生理盐水至90 mL；BFⅡ组：芬太尼0.5 mg+酒石酸布托啡诺5 mg+生理盐水至100 mL；BFⅢ组：芬太尼0.3 mg+酒石酸布托啡诺6 mg+生理盐水至90 mL。观察术后各时点视觉模拟评分（VAS）及镇静评分，患者满意度以及不良反应情况。 结果 术后早期BFⅢ组和B组VAS评分大于F组；镇静评分B组大于F组；B组满意度优良率小于其余各组；恶心呕吐发生率F组高于BFⅠ组及BFⅡ组。 结论 酒石酸布托啡诺和芬太尼合用于PCIA，镇痛效果确切，不良反应发生率低。推荐配比：BFⅠ组和BFⅡ组。
Optometry involves knowledge from multiple fields such as biology, physics, chemistry, psychophysics, and medicine. Traditional undergraduate education in optometry mainly focuses on knowledge transmission and lacks interaction, resulting in low student interest and unsatisfactory teaching outcomes. In order to improve this situation, the teaching team of Department of Optometry and Visual Science, West China School of Medicine, Sichuan University proposed a method of integrating real visual experiences into teaching. By combining multimedia tools and existing methods, real visual phenomena and personal visual experiences are integrated into the curriculum. This new teaching method stimulates students’ interest in learning, increases classroom interaction, promotes knowledge understanding and application through vivid visual phenomena and students’ own visual experiences. This article will introduce the above teaching method.
ObjectiveTo investigate the effects of form deprivation on the morphology of different types of RGC in mice.MethodsSixty B6.Cg-Tg (Thy1-YFP) HJrs/J transgenic mice were randomly assigned to form-deprived group (n=28) and control group (n=32). The right eyes of mice in the form-deprived group were covered by an occluder for 2 weeks as experimental eyes. The right eyes of mice in the control group were taken as control eyes. Before and 2 weeks after form deprivation, the refraction and ocular biometrics were measured; RGC were stained with Bra3a antibody and counted; the morphology of RGC was reconstructed with Neuroexplore software after immunohistochemical staining. The data was compared among experimental eyes, fellow eyes and control eyes by one-way analysis of variance.ResultsTwo weeks after form deprivation, the axial myopia was observed in the experimental eyes (refraction: F=15.009, P＜0.001; vitreous chamber depth: F=3.360, P=0047; ocluar axial length: F=5.011, P=0013). The number of RGC in central retina of the experimental eyes was decreased compared with the fellow eyes and the control eyes (F=4.769, P=0.035). The reconstructed RGC were classified into 4 types according to their dendritic morphology. Form deprivation affected all 4 types of RGC but in a different way. Among them, 3 types of RGC were likely contribute to form vision perception. Form deprivation increased the dendrite branches in these types of ganglion cells. However, form deprivation decreasd dendrite segment numbers in both eyes and the intersection and length insholl analyse type 4 ganglion cells which were morphologically identified as ipRGC.ConclusionForm deprivation distinguishingly affects the morphology of different types of RGC, indicating that form vision and non-form vision play different role in myopia development.