Pixel-Based Swallow Measurements: Correcting Nonsquare Pixels

Autor/inn/en	Larsen, Deirdre; Ikuma, Takeshi; Neubig, Luisa; Kist, Andreas M.; Leonard, Rebecca; McWhorter, Andrew J.; Kunduk, Melda
Titel	Pixel-Based Swallow Measurements: Correcting Nonsquare Pixels
Quelle	In: Journal of Speech, Language, and Hearing Research, 66 (2023) 2, S.565-572 (8 Seiten) PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Larsen, Deirdre) ORCID (Ikuma, Takeshi) ORCID (Kist, Andreas M.) ORCID (Leonard, Rebecca) ORCID (Kunduk, Melda)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1092-4388
Schlagwörter	Video Technology; Measurement; Physiology; Effect Size; Error of Measurement; Computer Software; Medical Research; Patients; Medical Evaluation; Records (Forms); Human Body; Diagnostic Tests; Louisiana + Suchen Sie Ihr Suchwort? Messverfahren; Physiologie; Messfehler; Patient; Formularsammlung; Menschlicher Körper; Diagnostic test; Diagnostischer Test
Abstract	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. (As Provided).
Anmerkungen	American Speech-Language-Hearing Association. 2200 Research Blvd #250, Rockville, MD 20850. Tel: 301-296-5700; Fax: 301-296-8580; e-mail: slhr@asha.org; Web site: http://jslhr.pubs.asha.org
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01