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Quantification of Transducer Misalignment in Ultrasound Tongue Imaging

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Document pages: 5 pages

Abstract: In speech production research, different imaging modalities have beenemployed to obtain accurate information about the movement and shaping of thevocal tract. Ultrasound is an affordable and non-invasive imaging modality withrelatively high temporal and spatial resolution to study the dynamic behaviorof tongue during speech production. However, a long-standing problem forultrasound tongue imaging is the transducer misalignment during longer datarecording sessions. In this paper, we propose a simple, yet effective,misalignment quantification approach. The analysis employs MSE distance and twosimilarity measurement metrics to identify the relative displacement betweenthe chin and the transducer. We visualize these measures as a function of thetimestamp of the utterances. Extensive experiments are conducted on a Hungarianand Scottish English child dataset. The results suggest that large values ofMean Square Error (MSE) and small values of Structural Similarity Index (SSIM)and Complex Wavelet SSIM indicate corruptions or issues during the datarecordings, which can either be caused by transducer misalignment or lack ofgel.

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