Accurate analysis of speech articulation is crucial for speech analysis. However, X-Y coordinates of articulators strongly depend on the anatomy of the speakers and the variability of pellet placements, and existing methods for mapping anatomical landmarks in the X-ray Microbeam Dataset (XRMB) fail to capture the entire anatomy of the vocal tract. In this paper, we propose a new geometric transformation that improves the accuracy of these measurements. Our transformation maps anatomical landmarks' X-Y coordinates along the midsagittal plane onto six relative measures: Lip Aperture (LA), Lip Protusion (LP), Tongue Body Constriction Location (TTCL), Degree (TBCD), Tongue Tip Constriction Location (TTCL) and Degree (TTCD). Our novel contribution is the extension of the palate trace towards the inferred anterior pharyngeal line, which improves measurements of tongue body constriction.

翻译：发音动作的精确分析对于语音分析至关重要。然而，发音器官的X-Y坐标严重依赖于说话者的解剖结构以及传感器放置的变异性，现有用于映射X射线微束数据集（XRMB）中解剖标志的方法未能捕捉声道完整解剖结构。本文提出一种新型几何变换，可提升这些测量的准确性。该变换将沿矢状面的解剖标志X-Y坐标映射为六种相对度量：唇开口度（LA）、唇突度（LP）、舌体收缩位置（TTCL）、收缩度（TBCD）、舌尖收缩位置（TTCL）及收缩度（TTCD）。本研究的核心创新在于将腭轨迹延伸至推断的咽前壁线，从而改进了舌体收缩的测量。