摘要
心房颤动(AF)是临床上最常见的心律失常之一。左心房及其心肌梗死后疤痕区域的准确分割和面积评估,对于心肌梗死患者出现AF的早期诊断、治疗规划以及预后评估具有极其重要的临床意义。深度学习方法是进行左心房及其心肌梗死后疤痕区域自动分割的主流方向。但是由于心肌梗死后疤痕体积小且容易受到周围增强组织的影响,分割精度尚有待提高。为此,提出了一种基于多尺度注意力和不确定性损失的两阶段深度学习模型。一方面,在网络上采样之前引入多尺度注意力模块(MSAM),该模块能够编码丰富的多尺度语义信息并让模型更为关注重要的语义信息及空间信息。另一方面,引入不确定性损失(Uncertainty Loss)以增强模型对疤痕不确定性的建模能力。此外,还采用直方图匹配(HM)增强图像质量,提高网络的分割能力。将所提出的方法在验证集以及左心房和疤痕量化与分割挑战赛(LAScarQS++)验证平台上进行验证,实验结果均表明该方法分割的疤痕更加完整,分割精度也得到了提升。与nnU-Net相比,心肌梗死后疤痕分割骰子系数(Dice)提高了8.12%。
Atrial Fibrillation(AF)is one of the most common arrhythmias clinically.Accurate segmentation and area assessment of the left atrium and its scar area after myocardial infarction are of great clinical significance for the early diagnosis,treatment planning and prognosis assessment of AF in patients with myocardial infarction.The deep learning-based method is the mainstream direction for automatic segmentation of the left atrium and the scar area after myocardial infarction.However,as the scar after myocardial infarction is small in size and easily affected by the surrounding enhanced tissue,the segmentation accuracy still remains to be improved.Therefore,a two-stage deep learning model based on multi-scale attention and uncertainty loss is proposed.On the one hand,a Multi-Scale Attention Module(MSAM)is introduced before sampling on the network.This module can encode rich multi-scale semantic information and make the model pay more attention to important semantic and spatial information.On the other hand,uncertainty loss is introduced to enhance the model’s ability to model scar uncertainty.In addition,this study also uses histogram matching(HM)to enhance image quality and improve the segmentation ability of the network.The proposed method is verified on the validation set and the left atrial and scar quantification and segmentation(LAScarQS++)evaluation platform.The experimental results show that the scar segmented by this method is more complete and the segmentation accuracy is also improved.Compared with nnU-Net,the Dice coefficient(Dice)of scar segmentation after myocardial infarction is increased by 8.12%.
作者
张鑫艳
唐振超
李一夫
刘振宇
ZHANG Xinyan;TANG Zhenchao;LI Yifu;LIU Zhenyu(School of Public Health,Anhui Medical University,Hefei 230032,China;CAS Key Laboratory of Molecular Imaging,Institute of Automation,Beijing 100190,China;Beijing Advanced Innovation Center for Big Data-Based Precision Medicine,School of Engineering Medicine,Beihang University,Beijing 100191,China;Key Laboratory of Big Data-Based Precision Medicine,Beihang University,Ministry of Industry and Information Technology,Beijing 100191,China;National Superior College for Engineers,Beihang University,Beijing 100191,China)
出处
《计算机科学》
北大核心
2025年第6期264-273,共10页
Computer Science
基金
中央高校基本科研业务费专项资金(YWF-23-Q-1074)
国家重点研发计划(2021YFA1301603)。
