Pixel-Based Swallow Measurements: Correcting Nonsquare Pixels.

Autor: Larsen D; Department of Communication Sciences and Disorders, Louisiana State University, Baton Rouge.; Our Lady of the Lake Voice Center, Baton Rouge, LA., Ikuma T; Our Lady of the Lake Voice Center, Baton Rouge, LA.; Department of Otolaryngology-Head and Neck Surgery, Louisiana State University Health Sciences Center, New Orleans., Neubig L; Department Artificial Intelligence in Biomedical Engineering, Friedrich-Alexander-Universität, Erlangen, Germany., Kist AM; Department Artificial Intelligence in Biomedical Engineering, Friedrich-Alexander-Universität, Erlangen, Germany., Leonard R; Department of Otolaryngology - Head and Neck Surgery, University of California, Davis Medical Center, Sacramento., McWhorter AJ; Our Lady of the Lake Voice Center, Baton Rouge, LA.; Department of Otolaryngology-Head and Neck Surgery, Louisiana State University Health Sciences Center, New Orleans., Kunduk M; Department of Communication Sciences and Disorders, Louisiana State University, Baton Rouge.; Our Lady of the Lake Voice Center, Baton Rouge, LA.; Department of Otolaryngology-Head and Neck Surgery, Louisiana State University Health Sciences Center, New Orleans.
Jazyk: angličtina
Zdroj: Journal of speech, language, and hearing research : JSLHR [J Speech Lang Hear Res] 2023 Feb 13; Vol. 66 (2), pp. 565-572. Date of Electronic Publication: 2023 Jan 30.
DOI: 10.1044/2022_JSLHR-22-00306
Abstrakt: Purpose: This research note illustrates the effects of video data with nonsquare pixels on the pixel-based measures obtained from videofluoroscopic swallow studies (VFSS).
Method: Six pixel-based distance and area measures were obtained from two different videoflouroscopic study units; both yielding videos with nonsquare pixels with different pixel aspect ratios (PARs). The swallowing measures were obtained from the original VFSS videos and from the videos after their pixels were squared.
Results: The results demonstrated significant multivariate effects both in video type (original vs. squared) and in the interaction between video type and sample (two video recordings of different patients, different PARs, and opposing tilt angles of the external reference). A wide range of variabilities was observed on the pixel-based measures between original and squared videos with the percent deviation ranging from 0.1% to 9.1% with the maximum effect size of 7.43.
Conclusions: This research note demonstrates the effect of disregarding PAR to distance and area pixel-based parameters. In addition, we present a multilevel roadmap to prevent possible measurement errors that could occur. At the planning stage, the PAR of video source should be identified, and, at the analyses stage, video data should be prescaled prior to analysis with PAR-unaware software. No methodology in prior absolute or relative pixel-based studies reports adjustment to the PAR prior to measurements nor identify the PAR as a possible source of variation within the literature. Addressing PAR will improve the precision and stability of pixel-based VFSS findings and improve comparability within and across clinical and research settings.
Supplemental Material: https://doi.org/10.23641/asha.21957134.
Databáze: MEDLINE
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