Page 73 - JSOM Spring 2023

FIGURE 2 Average path length and expert ratings for RUSH exam. FIGURE 4 Average rotational sum and expert ratings for RUSH exam.

The solid line refers to path length (left axis); dashed lines refer to The solid line refers to rotational sum (left axis); dashed lines refer to
expert ratings (right axis). As the number of trials increased, there expert ratings (right axis). As the number of trials increased, there was
was a significant negative trend in path length (coefficient: –216.77 a significant negative trend in rotational sum (coefficient: –1457.27
[–256.18 to –177.36] cm per trial; p < 0.001), which had moderate [–1743.06 to –1171.48] degrees per trial; p < 0.001), which had mod-
negative correlations with expert ratings (image finding: –0.58, image erate negative correlations with expert ratings (image finding: –0.59,
fine-tuning: –0.50, speed: –0.61, final image accuracy: –0.52, global image fine-tuning: –0.54, speed: –0.61, final image accuracy: –0.55,
assessment: –0.56; p ≤ 0.001 for all). global assessment: –0.59; p < 0.001 for all).
RUSH = Rapid Ultrasound for Shock and Hypotension. RUSH = Rapid Ultrasound for Shock and Hypotension.
FIGURE 3 Average number of translational motions and expert FIGURE 5 Average time and expert ratings for RUSH exam.
ratings for RUSH exam.

The solid line refers to time (left axis); dashed lines refer to expert
The solid line refers to the number of translational motions (left axis); ratings (right axis). As the number of trials increased, there was a sig-
dashed lines refer to expert ratings (right axis). As the number of tri- nificant negative trend in time (coefficient: –23.82 [–28.13 to –19.52]
als increased, there was a significant negative trend in the number of seconds per trial; p < 0.001), which had moderate negative correla-
translational motions (coefficient: –54.77 [–65.36 to –44.17] transla- tions with expert ratings (image finding: –0.61, image fine-tuning:
tional motions per trial; p < 0.001), which had moderate negative cor- –0.52, speed: –0.64, final image accuracy: –0.57, global assessment:
relations with expert ratings (image finding: –0.58, image fine-tuning: -0.59; p < 0.001 for all).
–0.49, speed: –0.61, final image accuracy: –0.52, global assessment: RUSH = Rapid Ultrasound for Shock and Hypotension.
–0.56; p < 0.001 for all).
RUSH = Rapid Ultrasound for Shock and Hypotension.
as well as their execution of the complete RUSH exam. This
personalized, metric-based teaching style may allow for more
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daily, personalized feedback to learners, informing them of efficient learning throughout training. This was also the first
high-yield areas for improvement and examining their per- use of segmentation to provide deliberate feedback for RUSH
formance throughout the course. While traditional training exams, marking a breakthrough in the application of motion
courses rely on pre- and post-assessments to measure their tracking technology.
predicted outcomes, our novel approach allowed for precise
identification of skill deficits throughout the course. More The advantage of motion analysis in the context of medical
specifically, segmentation of motion recordings allowed for education may extend beyond personalized training, into the
view-by-view analyses of performance, similar to previous realm of objectivity and continuous, feedback-based learning.
applications. This led to the development of daily feedback Throughout our course, medics were educated on how the
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sessions based on each trainee’s best and worst views obtained, metrics of path length, translational motions, rotational sum,
TABLE 2 Correlation Coefficients Between Motion Metrics and Expert Ratings
Metric Image finding Image fine-tuning Speed Final Image Accuracy Global Assessment
Path Length (cm) –0.58 (p < 0.001) –0.50 (p = 0.001) –0.61 (p < 0.001) –0.52 (p < 0.001) –0.56 (p < 0.001)
Translational Motions –0.58 (p < 0.001) –0.49 (p < 0.001) –0.61 (p < 0.001) –0.52 (p < 0.001) –0.56 (p < 0.001)
Rotational Sum (degrees) –0.59 (p < 0.001) –0.54 (p < 0.001) –0.61 (p < 0.001) –0.55 (p < 0.001) –0.59 (p < 0.001)
Time(s) –0.61 (p < 0.001) –0.52 (p < 0.001) –0.64 (p < 0.001) –0.57 (p < 0.001) –0.59 (p < 0.001)

Motion Analysis: POC Ultrasound | 71