Harris-Love Michael O, Ismail Catheeja, Monfaredi Reza, Hernandez Haniel J, Pennington Donte, Woletz Paula, McIntosh Valerie, Adams Bernadette, Blackman Marc R
Muscle Morphology, Mechanics and Performance Laboratory, Clinical Research Center, Veterans Affairs Medical Center, Washington, D.C., United States; Geriatrics and Extended Care Service, Veterans Affairs Medical Center, Washington, D.C., United States; Department of Exercise and Nutrition Sciences, Milken Institute School of Public Health, George Washington University, Washington, D.C., United States.
Muscle Morphology, Mechanics and Performance Laboratory, Clinical Research Center, Veterans Affairs Medical Center, Washington, D.C., United States; Department of Exercise and Nutrition Sciences, Milken Institute School of Public Health, George Washington University, Washington, D.C., United States.
PeerJ. 2016 Jun 21;4:e2146. doi: 10.7717/peerj.2146. eCollection 2016.
Background. Quantitative ultrasound measures are influenced by multiple external factors including examiner scanning force. Force feedback may foster the acquisition of reliable morphometry measures under a variety of scanning conditions. The purpose of this study was to determine the reliability of force-feedback image acquisition and morphometry over a range of examiner-generated forces using a muscle tissue-mimicking ultrasound phantom. Methods. Sixty material thickness measures were acquired from a muscle tissue mimicking phantom using B-mode ultrasound scanning by six examiners with varied experience levels (i.e., experienced, intermediate, and novice). Estimates of interrater reliability and measurement error with force feedback scanning were determined for the examiners. In addition, criterion-based reliability was determined using material deformation values across a range of examiner scanning forces (1-10 Newtons) via automated and manually acquired image capture methods using force feedback. Results. All examiners demonstrated acceptable interrater reliability (intraclass correlation coefficient, ICC = .98, p < .001) for material thickness measures obtained using force feedback. Individual examiners exhibited acceptable reliability with the criterion-based reference measures (ICC > .90, p < .001), independent of their level of experience. The measurement error among all examiners was 1.5%-2.9% across all applied stress conditions. Conclusion. Manual image capture with force feedback may aid the reliability of morphometry measures across a range of examiner scanning forces, and allow for consistent performance among examiners with differing levels of experience.
背景。定量超声测量受多种外部因素影响，包括检查者的扫描力度。力反馈可能有助于在各种扫描条件下获取可靠的形态测量值。本研究的目的是使用肌肉组织模拟超声体模，确定在一系列由检查者产生的力的情况下，力反馈图像采集和形态测量的可靠性。方法。由六位经验水平不同（即经验丰富、中等和新手）的检查者，使用B型超声扫描从肌肉组织模拟体模中获取60次材料厚度测量值。确定了检查者在力反馈扫描下的评分者间可靠性估计值和测量误差。此外，通过使用力反馈的自动和手动采集图像捕获方法，在一系列检查者扫描力（1 - 10牛顿）范围内使用材料变形值确定基于标准的可靠性。结果。所有检查者在使用力反馈获得的材料厚度测量值方面均表现出可接受的评分者间可靠性（组内相关系数，ICC = 0.98，p < 0.001）。个体检查者在基于标准的参考测量中表现出可接受的可靠性（ICC > 0.90，p < 0.001），与他们的经验水平无关。在所有施加的应力条件下，所有检查者的测量误差为1.5% - 2.9%。结论。使用力反馈的手动图像捕获可能有助于在一系列检查者扫描力下形态测量值的可靠性，并使不同经验水平的检查者表现一致。
