Optical Coherence Tomography(OCT)provides cross-sectional and three-dimensional reconstructions of the target tissue,allowing precise imaging and quantitative analysis of individual retinal layers.These images,based o...Optical Coherence Tomography(OCT)provides cross-sectional and three-dimensional reconstructions of the target tissue,allowing precise imaging and quantitative analysis of individual retinal layers.These images,based on optical inhomogeneities,reveal intricate cellular structures and are vital for tasks like retinal segmentation.The proposed study uses OCT images to identify significant differences in peripapillary retinal nerve fiber layer thickness.Incorporating spectral-domain analysis of OCT images significantly enhances the evaluation of Purtcher Retinopathy.To streamline this process,the study introduces a Context Encoding Deep Neural Network(CEDNN),which eliminates the time-consuming manual segmentation process while improving the accuracy of retinal layer thickness measurements.Despite the excellent performance of deep learning-based Convolutional Neural Networks(CNNs)in multiclass ocular fluid segmentation and lesion identification,certain challenges remain.Specifically,segmentation accuracy declines in regions with very tiny patches of subretinal fluid,often due to limited training data.The proposed CEDNN addresses these limitations by reducing processing time and enhancing accuracy.The approach incorporates advanced diffusion techniques in the 2D segmentation process using a gradient convergence field that accounts for the anisotropic nature of image features.Experimental results on public datasets and clinical OCT images demonstrate that the CEDNN approach achieves remarkable performance,with an accuracy of 99.3%,sensitivity of 99.4%,and specificity of 99%.Furthermore,the use of 3D representations of surface data outperforms traditional 2D surface estimates,enhancing segmentation quality.The system also incorporates temporal dimension estimation,making it feasible to forecast rapid disease progression.This advanced approach holds significant potential for improving retinal disease detection and analysis,setting a new benchmark in automated OCT-based diagnostics.展开更多
Dear Editor,We report a case of Purtscher-like retinopathy in a patient with coronavirus disease 2019(COVID-19).Fundus examination revealed extensive peripapillary white retinal patches(Purtscher’s fleckens)and cotto...Dear Editor,We report a case of Purtscher-like retinopathy in a patient with coronavirus disease 2019(COVID-19).Fundus examination revealed extensive peripapillary white retinal patches(Purtscher’s fleckens)and cotton-wool spots(CWS)with minor hemorrhage bilaterally,consistent with Purtscher-like retinopathy.Optical coherence tomography angiography(OCTA)showed multiple irregular areas of capillary nonperfusion.展开更多
背景:病例报告在发现新病例、罕见病、新治疗方法和非预期不良反应,探究发病机制,以及医学教育中有着重要的作用。Purtscher视网膜病变,是一种罕见病。病例报告是当前研究该疾病的重要途径。目的:运用病例报告的国际报告标准来评价远达...背景:病例报告在发现新病例、罕见病、新治疗方法和非预期不良反应,探究发病机制,以及医学教育中有着重要的作用。Purtscher视网膜病变,是一种罕见病。病例报告是当前研究该疾病的重要途径。目的:运用病例报告的国际报告标准来评价远达性视网膜病变病例报告的报告质量。方法:检索PubMed、EMBASE、Web of Science、CNKI、CBM、VIP和万方数据库中发表的关于远达性视网膜病变的病例报告。由6名研究者分3组根据纳入与排除标准独立筛选文献和提取资料。参考病例报告的国际报告标准的23个条目依次对纳入的病例报告质量进行评价。结果:共纳入76篇(包含98个病例)病例报告。报告较好的条目有临床发现(条目6)、诊断方法和依据(条目8a和8c)、随访和结局(条目10)以及对病例的讨论(条目11)。没有一篇病例报告满足所有报告条目,41%的病例报告没有在题目中说明病例报告的信息(条目1);62%的病例报告对干预措施的频次、剂量和强度信息报告不充分(条目9);67%的病例报告没有报告关键词(条目2);超过70%的病例报告没有将文章的关键信息在摘要中充分报告(3a,3b和3c);90%的病例报告没有对患者的诊断进行评估(条目8b和8d)。结论:当前远达性视网膜病变的报告质量亟待提高,且中文和英文语种病例报告的报告质量差异不大。需要采取更多的措施来改善病例报告的报告质量。展开更多
We hereby described two cases with unilateral Purtscher-like retinopathy. The first case occurred following an uneventful spontaneous vaginal delivery. The second case had no discernable cause despite having meticulou...We hereby described two cases with unilateral Purtscher-like retinopathy. The first case occurred following an uneventful spontaneous vaginal delivery. The second case had no discernable cause despite having meticulous systemic work-up. Both eyes had low presenting visual acuity of hand movements and 20/200 consecutively. We elected to inject 1 mg triamcinolone acetolamide in-travitreally for the treatment. Though, there was some subjective visual and clinical improvement within time in both patients, we were not convinced that intravitreal injection was superior to no treatment approach.展开更多
Dear Editor,We report a case of Purtscher-like retinopathy(PLR)in the presence of acute pancreatitis secondary to sarcoidosis.To our knowledge,this is the first case report of a PLR in a patient with sarcoidosis.
基金funded by the Deanship of Research and Graduate Studies at King Khalid University through small group research under grant number RGP1/180/46.
文摘Optical Coherence Tomography(OCT)provides cross-sectional and three-dimensional reconstructions of the target tissue,allowing precise imaging and quantitative analysis of individual retinal layers.These images,based on optical inhomogeneities,reveal intricate cellular structures and are vital for tasks like retinal segmentation.The proposed study uses OCT images to identify significant differences in peripapillary retinal nerve fiber layer thickness.Incorporating spectral-domain analysis of OCT images significantly enhances the evaluation of Purtcher Retinopathy.To streamline this process,the study introduces a Context Encoding Deep Neural Network(CEDNN),which eliminates the time-consuming manual segmentation process while improving the accuracy of retinal layer thickness measurements.Despite the excellent performance of deep learning-based Convolutional Neural Networks(CNNs)in multiclass ocular fluid segmentation and lesion identification,certain challenges remain.Specifically,segmentation accuracy declines in regions with very tiny patches of subretinal fluid,often due to limited training data.The proposed CEDNN addresses these limitations by reducing processing time and enhancing accuracy.The approach incorporates advanced diffusion techniques in the 2D segmentation process using a gradient convergence field that accounts for the anisotropic nature of image features.Experimental results on public datasets and clinical OCT images demonstrate that the CEDNN approach achieves remarkable performance,with an accuracy of 99.3%,sensitivity of 99.4%,and specificity of 99%.Furthermore,the use of 3D representations of surface data outperforms traditional 2D surface estimates,enhancing segmentation quality.The system also incorporates temporal dimension estimation,making it feasible to forecast rapid disease progression.This advanced approach holds significant potential for improving retinal disease detection and analysis,setting a new benchmark in automated OCT-based diagnostics.
基金Supported by the National Natural Science Foundation of China(No.81970815).
文摘Dear Editor,We report a case of Purtscher-like retinopathy in a patient with coronavirus disease 2019(COVID-19).Fundus examination revealed extensive peripapillary white retinal patches(Purtscher’s fleckens)and cotton-wool spots(CWS)with minor hemorrhage bilaterally,consistent with Purtscher-like retinopathy.Optical coherence tomography angiography(OCTA)showed multiple irregular areas of capillary nonperfusion.
文摘背景:病例报告在发现新病例、罕见病、新治疗方法和非预期不良反应,探究发病机制,以及医学教育中有着重要的作用。Purtscher视网膜病变,是一种罕见病。病例报告是当前研究该疾病的重要途径。目的:运用病例报告的国际报告标准来评价远达性视网膜病变病例报告的报告质量。方法:检索PubMed、EMBASE、Web of Science、CNKI、CBM、VIP和万方数据库中发表的关于远达性视网膜病变的病例报告。由6名研究者分3组根据纳入与排除标准独立筛选文献和提取资料。参考病例报告的国际报告标准的23个条目依次对纳入的病例报告质量进行评价。结果:共纳入76篇(包含98个病例)病例报告。报告较好的条目有临床发现(条目6)、诊断方法和依据(条目8a和8c)、随访和结局(条目10)以及对病例的讨论(条目11)。没有一篇病例报告满足所有报告条目,41%的病例报告没有在题目中说明病例报告的信息(条目1);62%的病例报告对干预措施的频次、剂量和强度信息报告不充分(条目9);67%的病例报告没有报告关键词(条目2);超过70%的病例报告没有将文章的关键信息在摘要中充分报告(3a,3b和3c);90%的病例报告没有对患者的诊断进行评估(条目8b和8d)。结论:当前远达性视网膜病变的报告质量亟待提高,且中文和英文语种病例报告的报告质量差异不大。需要采取更多的措施来改善病例报告的报告质量。
文摘We hereby described two cases with unilateral Purtscher-like retinopathy. The first case occurred following an uneventful spontaneous vaginal delivery. The second case had no discernable cause despite having meticulous systemic work-up. Both eyes had low presenting visual acuity of hand movements and 20/200 consecutively. We elected to inject 1 mg triamcinolone acetolamide in-travitreally for the treatment. Though, there was some subjective visual and clinical improvement within time in both patients, we were not convinced that intravitreal injection was superior to no treatment approach.
文摘Dear Editor,We report a case of Purtscher-like retinopathy(PLR)in the presence of acute pancreatitis secondary to sarcoidosis.To our knowledge,this is the first case report of a PLR in a patient with sarcoidosis.
