提出全自动心室测量框架,精准定位超声切面并自动测量左心室
WiseLVAM: A Novel Framework For Left Ventricle Automatic Measurements
- 基于弱监督检测器先估计心室轮廓,再按临床规范确定扫描线位置
- 在生成的解剖运动模式图像上完成测量,误差显著低于传统方法
- 完全自动化且可人工微调,适合临床常规应用
临床指南建议在基底水平(二尖瓣叶尖处)的B-mode超声图像上,沿虚拟扫描线(SL)垂直于左心室长轴进行线性测量。然而,大多数自动化方法直接从B-mode图像预测关键点,即使轻微的位置偏移也会导致显著测量误差,影响临床可靠性。近期半自动方法EnLVAM通过将关键点预测限制在医生定义的扫描线上,并利用生成的解剖运动模式(AMM)图像训练模型,有效缓解该问题。本文提出一种轮廓感知的扫描线自动定位方法:先用弱监督的B-mode关键点检测器估计左心室轮廓,再推断左心室长轴和基底水平,以模仿临床操作。在此基础上,构建了全新的全自动化、可人工调整的WiseLVAM框架,可在AMM模式下自动放置扫描线并完成左心室线性测量。该框架结合了B-mode图像的结构感知与AMM模式的运动感知,显著提升鲁棒性和准确性,具备实际临床应用潜力。源代码已公开于https://github.com/SFI-Visual-Intelligence/wiselvam.git。
原文摘要 · Abstract (English)
Clinical guidelines recommend performing left ventricular (LV) linear measurements in B-mode echocardiographic images at the basal level -- typically at the mitral valve leaflet tips -- and aligned perpendicular to the LV long axis along a virtual scanline (SL). However, most automated methods estimate landmarks directly from B-mode images for the measurement task, where even small shifts in predicted points along the LV walls can lead to significant measurement errors, reducing their clinical reliability. A recent semi-automatic method, EnLVAM, addresses this limitation by constraining landmark prediction to a clinician-defined SL and training on generated Anatomical Motion Mode (AMM) images to predict LV landmarks along the same. To enable full automation, a contour-aware SL placement approach is proposed in this work, in which the LV contour is estimated using a weakly supervised B-mode landmark detector. SL placement is then performed by inferring the LV long axis and the basal level- mimicking clinical guidelines. Building on this foundation, we introduce \textit{WiseLVAM} -- a novel, fully automated yet manually adaptable framework for automatically placing the SL and then automatically performing the LV linear measurements in the AMM mode. \textit{WiseLVAM} utilizes the structure-awareness from B-mode images and the motion-awareness from AMM mode to enhance robustness and accuracy with the potential to provide a practical solution for the routine clinical application. The source code is publicly available at https://github.com/SFI-Visual-Intelligence/wiselvam.git.
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