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：准确的语音发音分析对语音研究至关重要。然而，发音器官的X-Y坐标严重依赖于说话者的解剖结构和颗粒放置的变异性，现有方法在映射X射线微束数据集（XRMB）中的解剖标志时，无法完整捕捉声道解剖结构。本文提出一种新的几何变换方法，以提高这些测量的精度。该变换将矢状面解剖标志的X-Y坐标映射至六项相对测量指标：唇开口度（LA）、唇突度（LP）、舌体缩窄位置（TTCL）、缩窄度（TBCD）、舌尖缩窄位置（TTCL）及缩窄度（TTCD）。我们的创新贡献在于将腭迹线延伸至推断的咽前线，从而改进了舌体缩窄的测量。