.Abstracting eye models from MRI images is critical in advancing medical imaging, particularly for clinical diagnostics. Current methods often struggle with accuracy and efficiency, highlighting a gap this research ai....Abstracting eye models from MRI images is critical in advancing medical imaging, particularly for clinical diagnostics. Current methods often struggle with accuracy and efficiency, highlighting a gap this research aims to fill. This study investigates the application of machine learning methods, focusing on the U-net-based deep learning framework, to improve the accuracy of eye model extraction. The objectives include fitting measured eye data to models such as the Ellipsoid model, evaluating automated segmentation tools, and assessing the usability of machine learning-based extractions in clinical scenarios. We employed point cloud data of 202,872 points to fit eye models using ellipsoid, non-linear, and spherical fitting techniques. The fitting processes were optimized to ensure precision and reliability. We compared the performance of these models using mean squared error (MSE) as the primary metric. The non-linear model emerged as the most accurate, with a significantly lower MSE (1.186562) compared to the ellipsoid (781.0542) and spherical models. This finding indicates that the non-linear model provides a more detailed and precise representation of the eye’s geometry. These results suggest that machine learning methods, particularly non-linear models, can significantly enhance the accuracy and usability of eye model extraction in clinical diagnostics, offering a robust framework for future advancements in medical imaging.展开更多
Ultra-wideband （UWB） microwave imaging is a promising method for breast cancer detection based on the large contrast of electric parameters between the malignant tumor and its surrounded normal breast organisms. In ...Ultra-wideband （UWB） microwave imaging is a promising method for breast cancer detection based on the large contrast of electric parameters between the malignant tumor and its surrounded normal breast organisms. In the case of multiple tumors being present, the conventional imaging approaches may be ineffective to detect all the tumors clearly. In this paper, a progressive processing method is proposed for detecting more than one tumor. The method is divided into three stages： primary detection, refocusing and image optimization. To test the feasibility of the approach, a numerical breast model is developed based on the realistic magnetic resonance image （MRI）. Two tumors are assumed embedded in different positions. Successful detection of a 3.6 mm-diameter tumor at a depth of 42 mm is achieved. The correct information of both tumors is shown in the reconstructed image, suggesting that the progressive processing method is promising for multi-tumor detection.展开更多
目的建立基于MRI术前子宫内膜癌(endometrial cancer,EC)的分子亚型的生境影像组学预测模型。方法回顾性收集2家医学中心经病理证实的EC患者,分别纳入训练组(n=270)和测试组(n=70)。所有患者均进行了术前MRI及病理组织学和分子亚型诊断...目的建立基于MRI术前子宫内膜癌(endometrial cancer,EC)的分子亚型的生境影像组学预测模型。方法回顾性收集2家医学中心经病理证实的EC患者,分别纳入训练组(n=270)和测试组(n=70)。所有患者均进行了术前MRI及病理组织学和分子亚型诊断。首先根据扩散加权成像(diffusion-weighted imaging,DWI)和对比增强(contrast enhancement,CE)图像对肿瘤进行生境亚区域分区,随后从T1加权成像(T1-weighted imaging,T1WI)、T2加权成像(T2-weighted imaging,T2WI)、DWI和CE图像的不同亚区域提取生境影像组学特征。应用3种机器学习分类器,包括逻辑回归、支持向量机和随机森林,分别建立预测p53异常型EC的模型并进行效能验证,表现出最佳综合预测性能的模型被选为生境影像组学模型。采用相同程序,建立基于T1WI、T2WI、DWI和CE共4个序列的全区域影像组学模型及临床模型。采用受试者工作特性曲线评估模型的效能,使用DeLong检验比较模型的差异。使用决策曲线分析评价模型应用的临床收益。结果经特征选择后保留8个生境影像组学特征建立生境影像组学模型、10个全区域影像组学特征建立影像组学模型和3个临床特征建立临床模型。生境影像组学模型曲线下面积(area under the curve,AUC)最高,分别为0.855(0.788~0.922,训练集)和0.769(0.631~0.907,验证集)。DeLong检验显示训练集的生境影像组学模型效能优于全区域影像组学模型(P=0.001),但测试集差异不显著(P=0.543);两组生境影像组学模型效能均优于临床模型(P=0.007,训练集;P=0.038,验证集)。DCA曲线显示该模型在阈值概率0.2~0.8之间均可对临床诊断提供收益。结论基于MRI的生境影像组学模型可以较准确地预测p53异常型的EC,效能优于全区域影像组学和临床模型,有助于术前EC的无创性分子亚型分型。展开更多
This work presents an efficient method for volume rendering of glioma tumors from segmented 2D MRI Datasets with user interactive control, by replacing manual segmentation required in the state of art methods. The mos...This work presents an efficient method for volume rendering of glioma tumors from segmented 2D MRI Datasets with user interactive control, by replacing manual segmentation required in the state of art methods. The most common primary brain tumors are gliomas, evolving from the cerebral supportive cells. For clinical follow-up, the evaluation of the preoperative tumor volume is essential. Tumor portions were automatically segmented from 2D MR images using morphological filtering techniques. These segmented tumor slices were propagated and modeled with the software package. The 3D modeled tumor consists of gray level values of the original image with exact tumor boundary. Axial slices of FLAIR and T2 weighted images were used for extracting tumors. Volumetric assessment of tumor volume with manual segmentation of its outlines is a time-consuming process and is prone to error. These defects are overcome in this method. Authors verified the performance of our method on several sets of MRI scans. The 3D modeling was also done using segmented 2D slices with the help of medical software package called 3D DOCTOR for verification purposes. The results were validated with the ground truth models by the Radiologist.展开更多
文摘.Abstracting eye models from MRI images is critical in advancing medical imaging, particularly for clinical diagnostics. Current methods often struggle with accuracy and efficiency, highlighting a gap this research aims to fill. This study investigates the application of machine learning methods, focusing on the U-net-based deep learning framework, to improve the accuracy of eye model extraction. The objectives include fitting measured eye data to models such as the Ellipsoid model, evaluating automated segmentation tools, and assessing the usability of machine learning-based extractions in clinical scenarios. We employed point cloud data of 202,872 points to fit eye models using ellipsoid, non-linear, and spherical fitting techniques. The fitting processes were optimized to ensure precision and reliability. We compared the performance of these models using mean squared error (MSE) as the primary metric. The non-linear model emerged as the most accurate, with a significantly lower MSE (1.186562) compared to the ellipsoid (781.0542) and spherical models. This finding indicates that the non-linear model provides a more detailed and precise representation of the eye’s geometry. These results suggest that machine learning methods, particularly non-linear models, can significantly enhance the accuracy and usability of eye model extraction in clinical diagnostics, offering a robust framework for future advancements in medical imaging.
基金supported by the National Natural Science Foundation of China(Grant No.61271323)the Open Project from State Key Laboratory of MillimeterWaves,China(Grant No.K200913)
文摘Ultra-wideband （UWB） microwave imaging is a promising method for breast cancer detection based on the large contrast of electric parameters between the malignant tumor and its surrounded normal breast organisms. In the case of multiple tumors being present, the conventional imaging approaches may be ineffective to detect all the tumors clearly. In this paper, a progressive processing method is proposed for detecting more than one tumor. The method is divided into three stages： primary detection, refocusing and image optimization. To test the feasibility of the approach, a numerical breast model is developed based on the realistic magnetic resonance image （MRI）. Two tumors are assumed embedded in different positions. Successful detection of a 3.6 mm-diameter tumor at a depth of 42 mm is achieved. The correct information of both tumors is shown in the reconstructed image, suggesting that the progressive processing method is promising for multi-tumor detection.
文摘目的建立基于MRI术前子宫内膜癌(endometrial cancer,EC)的分子亚型的生境影像组学预测模型。方法回顾性收集2家医学中心经病理证实的EC患者,分别纳入训练组(n=270)和测试组(n=70)。所有患者均进行了术前MRI及病理组织学和分子亚型诊断。首先根据扩散加权成像(diffusion-weighted imaging,DWI)和对比增强(contrast enhancement,CE)图像对肿瘤进行生境亚区域分区,随后从T1加权成像(T1-weighted imaging,T1WI)、T2加权成像(T2-weighted imaging,T2WI)、DWI和CE图像的不同亚区域提取生境影像组学特征。应用3种机器学习分类器,包括逻辑回归、支持向量机和随机森林,分别建立预测p53异常型EC的模型并进行效能验证,表现出最佳综合预测性能的模型被选为生境影像组学模型。采用相同程序,建立基于T1WI、T2WI、DWI和CE共4个序列的全区域影像组学模型及临床模型。采用受试者工作特性曲线评估模型的效能,使用DeLong检验比较模型的差异。使用决策曲线分析评价模型应用的临床收益。结果经特征选择后保留8个生境影像组学特征建立生境影像组学模型、10个全区域影像组学特征建立影像组学模型和3个临床特征建立临床模型。生境影像组学模型曲线下面积(area under the curve,AUC)最高,分别为0.855(0.788~0.922,训练集)和0.769(0.631~0.907,验证集)。DeLong检验显示训练集的生境影像组学模型效能优于全区域影像组学模型(P=0.001),但测试集差异不显著(P=0.543);两组生境影像组学模型效能均优于临床模型(P=0.007,训练集;P=0.038,验证集)。DCA曲线显示该模型在阈值概率0.2~0.8之间均可对临床诊断提供收益。结论基于MRI的生境影像组学模型可以较准确地预测p53异常型的EC,效能优于全区域影像组学和临床模型,有助于术前EC的无创性分子亚型分型。
文摘This work presents an efficient method for volume rendering of glioma tumors from segmented 2D MRI Datasets with user interactive control, by replacing manual segmentation required in the state of art methods. The most common primary brain tumors are gliomas, evolving from the cerebral supportive cells. For clinical follow-up, the evaluation of the preoperative tumor volume is essential. Tumor portions were automatically segmented from 2D MR images using morphological filtering techniques. These segmented tumor slices were propagated and modeled with the software package. The 3D modeled tumor consists of gray level values of the original image with exact tumor boundary. Axial slices of FLAIR and T2 weighted images were used for extracting tumors. Volumetric assessment of tumor volume with manual segmentation of its outlines is a time-consuming process and is prone to error. These defects are overcome in this method. Authors verified the performance of our method on several sets of MRI scans. The 3D modeling was also done using segmented 2D slices with the help of medical software package called 3D DOCTOR for verification purposes. The results were validated with the ground truth models by the Radiologist.
