• New Ultrafast sequence published in Physics in Medicine and Biology

Publication in Physics in Medicine and Biology, October 2015
Multiplane wave imaging increases signal-to-noise ratio in ultrafast ultrasound imaging.

 

Our team “Wave physics for medicine” (Inserm Unit 979) led by Mickaël Tanter, in collaboration with the Inserm Unit 1130 “Neuroscience Paris Seine” led by Ivan Cohen, has recently published a new article in the Physics in Medicine and Biology (PMB) journal. This paper presents a new ultrafast ultrasound sequence that strongly improves the signal-to-noise ratio of ultrafast images, without compromising the frame rate nor the resolution of ultrafast ultrasound acquisitions. The method consists in virtually increasing the transmission signal amplitude using a smart combination of multiple plane waves transmitted at the same time with an Hadamard basis encoding.

We have experimentally demonstrated the benefits of such multiplane wave imaging for different applications: B-mode, shear wave elastrography and ultrafast Doppler imaging, the last application being demonstrated in an in-vivo experiment in the living rat brain. For these three applications the image quality and the measurements accuracy are increased using multiplane wave imaging. Moreover we have shown that multiplane wave imaging enables deeper penetration and imaging. Thus, multiplane wave imaging will be of great interest for many clinical applications for deep organs imaging.
For an equivalent frame rate, multiplane wave imaging enhances image quality compared to classical coherent plane wave compounding technique; this also means that for the same image quality multiplane wave imaging enables higher frame rate than classical plane wave compounding. This new ultrafast ultrasound imaging sequence based on multiple plane wave emission is easy to implement and could be used in a large range of clinical and research applications by conferring them great quality and accuracy improvements.

Elodie Tiran“In the specific field of functional brain imaging, the use of Multiplane wave sequences will be of great interest to study the activity of deep seated brain structures. It could also be used to increase the signal-to-noise ratio in transcranial functional imaging. The simplicity of transmission signals encoding based on simultaneous multiple plane wave transmissions with Hadamard amplitudes makes the decoding process extremely powerful and based on very simple operations” explains  Elodie Tiran, the first Author of this research work and PhD student at the Langevin Institute – Wave Physics for Medicine. 

For more information, see:

Multiplane wave imaging increases signal-to-noise ratio in ultrafast ultrasound imaging.

Elodie Tiran, Thomas Deffieux, Mafalda Correia, David Maresca, Bruno-Felix Osmanski, Lim-Anna Sieu, Antoine Bergel, Ivan Cohen, Mathieu Pernot and Mickaël Tanter, Physics in Medicine and Biology, 2015 Oct 21, volume 60, number 21.

http://iopscience.iop.org/article/10.1088/0031-9155/60/21/8549