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Poster De Conférence Année : 2017

3D Ultrasound Imaging of Tissue Anisotropy Using Spatial Coherence: Comparison between Plane Waves and Diverging Waves

Emeline Turquin
François Varray
Hervé Liebgott

Résumé

Background, Motivation and ObjectiveAfter a myocardium infarction, cell loss is irremediable leading to a progressive local disorganization and change in the tissue structure altering heart function. An imaging method able to render the local tissue directivity would be a powerful tool to characterize the extent of the lesion. In this field, diffusion MRI is the reference. Because of its long acquisitiontime and the difficulty to tackle organ motion, faster imaging strategies such as ultrasound, are mandatory for such clinical applications. One of them is the spatial coherence of US waves, already developed in focused and plane waves (2D and 3D) but never in diverging waves [Papadacci, UFFC 2014]. The advantage of diverging waves is to create an imagewith a higher field of view, which is more appropriate to in vivo cardiac applications. The purpose of this work is to use 2D spatial coherence to determine the fibers orientation and to compare results in 3D steered plane and diverging waves.Statement of Contribution/MethodsSpatial coherence is representative of the tissue structure. In an anisotropic medium, spatial coherence is high in that preferred local direction and the 2D coherence function exhibits an ellipsoidal shape. The main axis of this ellipse corresponds to the local main direction of the underlying tissue structure. Acquisitions have been conducted on a phantom designed from seven angled wires (ø 0.3 mm) embedded in an agar gel. The dataset was obtained using a 1024 channels ultrasound system based on the synchronization of 4 Verasonics Vantage 256 systems. A 1024 elements of a 32x32 elements 3 MHz array (Vermon) was fully controlled to transmit 2D steered plane and diverging waves on the same location. 25 transmission angles from -5° to 5° in x and y direction were used. The 2D coherence function maps were calculated on the spatial points corresponding to the centre of the seven wires and the main axis of ellipsoidal shapes are extracted to render the wires angle.Results/DiscussionThe curves representing the wires angle obtained in both plane and diverging waves are close to the reference. Using diverging waves, a RMSE of 4.8° is obtained which is better than the RMSE of 11.2° obtained with plane wave transmissions. It demonstrates the interest of 3D diverging waves to increase both the field of view and the coherence calculation accuracy. Such results must now be confirmed on heart sample acquisitions.
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Dates et versions

hal-01599497 , version 1 (02-10-2017)

Identifiants

  • HAL Id : hal-01599497 , version 1

Citer

Emeline Turquin, François Varray, Lorena Petrusca, Magalie Viallon, Hervé Liebgott. 3D Ultrasound Imaging of Tissue Anisotropy Using Spatial Coherence: Comparison between Plane Waves and Diverging Waves. 2017 IEEE International Ultrasonic Symposium (IUS), Sep 2017, Washington, United States. 2017. ⟨hal-01599497⟩
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