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Enhancing reproducibility of ultrasonic measurements by new users

Pramanik, Manojit and Gupta, Madhumita and Krishnan, Kajoli Banerjee (2013) Enhancing reproducibility of ultrasonic measurements by new users. In: Image Perception, Observer Performance, and Technology Assessment Conference, part of the SPIE Medical Imaging Symposium, FEB 10-11, 2013, Lake Buena Vista, FL.

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Official URL: http://dx.doi.org/10.1117/12.2008032

Abstract

Perception of operator influences ultrasound image acquisition and processing. Lower costs are attracting new users to medical ultrasound. Anticipating an increase in this trend, we conducted a study to quantify the variability in ultrasonic measurements made by novice users and identify methods to reduce it. We designed a protocol with four presets and trained four new users to scan and manually measure the head circumference of a fetal phantom with an ultrasound scanner. In the first phase, the users followed this protocol in seven distinct sessions. They then received feedback on the quality of the scans from an expert. In the second phase, two of the users repeated the entire protocol aided by visual cues provided to them during scanning. We performed off-line measurements on all the images using a fully automated algorithm capable of measuring the head circumference from fetal phantom images. The ground truth (198.1 +/- 1.6 mm) was based on sixteen scans and measurements made by an expert. Our analysis shows that: (1) the inter-observer variability of manual measurements was 5.5 mm, whereas the inter-observer variability of automated measurements was only 0.6 mm in the first phase (2) consistency of image appearance improved and mean manual measurements was 4-5 mm closer to the ground truth in the second phase (3) automated measurements were more precise, accurate and less sensitive to different presets compared to manual measurements in both phases. Our results show that visual aids and automation can bring more reproducibility to ultrasonic measurements made by new users.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to SPIE-International Society for Optical Engineering.
Keywords: Ultrasound; Measurement; Reproducibility; Phantom; Algorithm; Automation; New User
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Depositing User: Francis Jayakanth
Date Deposited: 23 Sep 2013 08:51
Last Modified: 24 Sep 2013 06:35
URI: http://eprints.iisc.ac.in/id/eprint/47413

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