Simultaneous Coded Plane Wave Imaging: Implementation on a Research Echograph

Denis Bujoreanu 1 Adeline Bernard 2 Barbara Nicolas 1 Hervé Liebgott 1 Denis Friboulet 3
1 Imagerie Ultrasonore
CREATIS - Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé
2 PILoT - Plateforme d'Imagerie Multimodale LyonTech
CREATIS - Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé
3 Images et Modèles
CREATIS - Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé
Abstract : Background, Motivation and ObjectiveIn our previous work, published in the ICASSP 2017 conference we proposed an imaging technique called Simultaneous Coded Emission (SCE) of plane waves. SCE borrows ideas from plane wave Coherent Compounding (CC) and channel estimation in telecommunication systems, and has the potential to yield similar to CC image quality at significant higher frame rates. Improving over our previous work, we address in this paper the feasibility of the SCE on a real acquisition system, and show an implementation of SCE on the Ultrasound Advanced Open Platform (Ula-OP).Statement of Contribution/MethodsSimply put, in the concept of SCE, several plane waves are emitted simultaneously each of them carrying a pseudo-orthogonal code. In our previous work we showed that the received signal at the i element of the transducer can be written as yi=Agi+vi where A is the coding matrix and gi are the signals that can be beamformed in order to obtain thecorresponding images. Since in in-vitro acquisition the level of observation noise vi is unknown, in this work we propose to solve the above inverse problem using an Linear Square Estimator (LSE) based on the Singular Value Decomposition (SVD) of the coding matrix A. The SVD based LSE allows decreasing the condition number of the inverse problem which implies a better stability of the solution to acquisition noise.Results/DiscussionExperiments have been performed on a cyst phantom with two plane waves (emission angles 4° and -7°) emitted either successively (CC) or simultaneously (SCE). Figure 1 shows the results obtained using CC (Fig. 1A) and SCE (Fig. 1B). For the SCE acquisition, the SVD based solver allows reconstructing the image of the cyst (Fig. 1B) however the finalimage has a lower quality (CNR=6.02dB) than the corresponding CC image (Fig. 1A, CNR=7.52dB). As shown in Fig. 1C the solver has an optimal point where the tradeoff between the computational error and noise stability is optimal for a certain level of noise (here SNR≈21dB). Since no regularization is used, the overall quality of the image decreases if onewants to increase the frame rate of our method, as shown in Fig. 1D. As a consequence, future work will focus on designing an appropriate regularization technique that will allow increasing the frame rate while preserving the CNR.
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Submitted on : Monday, October 2, 2017 - 11:27:43 AM
Last modification on : Wednesday, November 20, 2019 - 3:21:27 AM

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  • HAL Id : hal-01599409, version 1

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Denis Bujoreanu, Adeline Bernard, Barbara Nicolas, Hervé Liebgott, Denis Friboulet. Simultaneous Coded Plane Wave Imaging: Implementation on a Research Echograph. 2017 IEEE International Ultrasonic Symposium (IUS), Sep 2017, Washington, United States. ⟨hal-01599409⟩

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