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Use the force: deformation correction in robotic 3D ultrasound

  • Salvatore Virga
  • Rüdiger Göbl
  • Maximilian Baust
  • Nassir Navab
  • Christoph Hennersperger
Original Article
  • 227 Downloads

Abstract

Purpose

Ultrasound acquisitions are typically affected by deformations due to the pressure applied onto the contact surface. While a certain amount of pressure is necessary to ensure good acoustic coupling and visibility of the anatomy under examination, the caused deformations hinder accurate localization and geometric analysis of anatomical structures. These complications have even greater impact in case of 3D ultrasound scans as they limit the correct reconstruction of acquired volumes.

Methods

In this work, we propose a method to estimate and correct the induced deformation based solely on the tracked ultrasound images and information about the applied force. This is achieved by modeling estimated displacement fields of individual image sequences using the measured force information. By representing the computed displacement fields using a graph-based approach, we are able to recover a deformation-less 3D volume.

Results

Validation is performed on 30 in vivo human datasets acquired using a robotic ultrasound framework. Compared to ground truth, the presented deformation correction shows errors of \(3.39 \, \pm \, 1.86\,\hbox {mm}\) for an applied force of 5 N at a penetration depth of 55 mm.

Conclusion

The proposed technique allows for the correction of deformations induced by the transducer pressure in entire 3D ultrasound volumes. Our technique does not require biomechanical models, patient-specific assumptions or information about the tissue properties; it can be employed based on the information from readily available robotic ultrasound platforms.

Keywords

Robotic ultrasound Deformation correction Compounding Inpainting 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare to have no conflict of interest.

Human and animals rights

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. No animal experiments were performed in this study.

Informed consent

Informed consent was obtained from all participants.

Supplementary material

Supplementary material 1 (mp4 19687 KB)

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Copyright information

© CARS 2018

Authors and Affiliations

  1. 1.Technical University of MunichGarching bei MünchenGermany
  2. 2.Johns Hopkins UniversityBaltimoreUSA

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