Semi-blinded freehand 3D ultrasound with novice users

Satvika Bharadwaj; Komal N. Shah; Yifan Zhao; Aparna Harindranath; Arun George; Kajoli B. Krishnan; Manish Arora

doi:10.1117/12.2610969

4 April 2022 Semi-blinded freehand 3D ultrasound with novice users

Satvika Bharadwaj, Komal N. Shah, Yifan Zhao, Aparna Harindranath, Arun George, Kajoli B. Krishnan, Manish Arora

Proceedings Volume 12035, Medical Imaging 2022: Image Perception, Observer Performance, and Technology Assessment; 1203516 (2022) https://doi.org/10.1117/12.2610969
Event: SPIE Medical Imaging, 2022, San Diego, California, United States

Conference Poster

Abstract

We have built upon an existing freehand 3D ultrasound imaging technique to enable display-less scanning at a local site by novice users and remote reading by integrating an electromagnetic tracker with a 2D probe. Seventy-two volumes are generated using a reconstruction algorithm from data collected by three users in a single longitudinal sweep across a 23- week fetus phantom in four different configurations for six scan durations ranging from 5-s to 30-s. The acquisition is semi-blinded: the user knows the fetal orientation but scans without image display and guidance of a conventional scan. Three non-expert readers and one expert Radiologist extract the clinically relevant planes and measure four key biometric features from the 3D images. In this paper, we propose (1) a risk metric R to rate the quality of the scan as a function of probe motion and contact and (2) a measurability index M for the availability of the 2D planes within the volume and visibility of the biometric features. Our analysis shows that R is the lowest and M the highest for 15-s acquisitions corresponding to an average transducer sweep speed of 2.4-cm/s. The finding is consistent with a reported speed range of 3-4 cm/s recommended for a low cost teleradiology solution for 2D ultrasound. The errors in average biometric measurements compared to the 50th percentile values in the fetal biometry tables for corresponding gestational week are within -3.8 to 5.7%. R, M, accuracy and precision of measurements are useful indicators of performance of the 3D ultrasound system.

Conference Presentation

Citation Download Citation

Satvika Bharadwaj, Komal N. Shah, Yifan Zhao, Aparna Harindranath, Arun George, Kajoli B. Krishnan, and Manish Arora "Semi-blinded freehand 3D ultrasound with novice users", Proc. SPIE 12035, Medical Imaging 2022: Image Perception, Observer Performance, and Technology Assessment, 1203516 (4 April 2022); https://doi.org/10.1117/12.2610969

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