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International Journal of Computer Assisted Radiology and Surgery

Erschienen in:

21.08.2019 | Original Article

Ultrasound simulation with deformable and patient-specific scatterer maps

verfasst von: Rastislav Starkov, Lin Zhang, Michael Bajka, Christine Tanner, Orcun Goksel

Erschienen in: International Journal of Computer Assisted Radiology and Surgery | Ausgabe 9/2019

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Abstract

Purpose

Ray-tracing-based simulations model ultrasound (US) interactions with a custom geometric anatomical model, where US texture can be emulated via real-time point-spread function convolutions of a tissue scatterer representation. Such scatterer representations for realistic appearance are difficult to parameterize or model manually and do not respond to volumetric deformations such as those caused with tissue compression by the probe. Herein we utilize brightness mode (B-mode) estimated scatterer maps for ray tracing and propose to enhance the realism of ray-tracing-based simulations by incorporating dynamic speckle patterns that change compliant with tissue deformation.

Methods

In this work, we realistically simulate US texture deformations in the scatterer domain via back-projection of ray segments into a nominal state before sampling during simulation runtime. We estimate scatterer maps from background in vivo images using a pretrained generative adversarial network.

Results

We demonstrated our proposed scatterer estimation and runtime background fusion method on simulated transvaginal US scans of detailed surface-based foetal models. We show the viability of modelling deformations in the scatterer domain at interactive frame rates of 28 frames per second. A quantitative and a qualitative evaluations indicated improved realism in comparison to the state of the art.

Conclusions

Transferring a background image in a scatterer representation enables us to capture anatomical content in a physical space, in which deformations can be incorporated physically consistently before convolving with a US point-spread function during simulation runtime. This then uses the same imaging model on both the background and the hand-crafted models leading to a consistent and seamless compounding of contents in the scatterer space.

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Provided as supplementary material.

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Titel: Ultrasound simulation with deformable and patient-specific scatterer maps
verfasst von: Rastislav Starkov
Lin Zhang
Michael Bajka
Christine Tanner
Orcun Goksel
Publikationsdatum: 21.08.2019
Verlag: Springer International Publishing
Erschienen in: International Journal of Computer Assisted Radiology and Surgery / Ausgabe 9/2019
Print ISSN: 1861-6410
Elektronische ISSN: 1861-6429
DOI: https://doi.org/10.1007/s11548-019-02054-5

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Abstract

Purpose

Methods

Results

Conclusions

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