Seminar 8 -S3, Tuesday 6th December 2022, 14:00 (London Time)

Speaker: Ronald Aznavourian (Institut Fresnel, Marseille, France)

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Title: Denoising of radar images by AI.

Abstract: A lot of applications are possible with AI: classification, to sort a lot of images in many different categories, denoising, to improve the quality of a signal or an image, and “generative”, to create a fake image which seems to be very real. Here, I propose to use an autoencoder to denoise radar images. In order to achieve this, I first propose to create an adequate dataset of 60,000 images to train the autoencoder.

Biography: Ronald’s background is mainly in computer science. He graduated from an engineering school in networks, systems and multimedia and worked on morphing applied to numerical simulations during his engineering thesis. He is now a PhD student, in the third year of his thesis, in the field of image processing, under the supervision of Julien Marot, at the Institut Fresnel. He uses AI, and more particularly neural networks to denoise images, as well as bio-inspired single-objective optimization methods, such as the Grey Wolf Optimizer (GWO), or multi-objective optimization methods based on Genetic Algorithms, such as the Non-dominated Sorted Genetic Algorithm-II (NSGA-II) to optimize neural networks or even invisibility cloaks.

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Seminar 9 -S3, Tuesday 13th December 2022, 14:00 (London Time)

Speaker: Noé Jiménez (Instituto de Instrumentación para Imagen Molecular – i3M, CSIC – Spanish Research Council)

Title: Holographic metasurfaces for the new generation of biomedical ultrasound applications

Abstract: Optical holograms can modulate light wavefronts to generate visible images. In the same way, acoustic images can also be synthesized by holograms, shaping the areas where mechanical waves present a high amplitude, and areas where the media is at rest. In this work, we present the recent advances of acoustic holograms and structured media to engineer the acoustic wavefront to focus ultrasound beams for biomedical applications. We show how we can engineer ultrasonic wavefronts by using acoustic metasurfaces. This results in complex holographic lenses, or acoustic holograms, that can shape therapeutical acoustic images for the non-invasive treatment of neurological disorders, to produce cavitation patterns for localized drug delivery, and uniform thermal patterns of arbitrary shape for targeted hyperthermia. In this way, acoustic holograms emerge as a disruptive and low-cost approach for biomedical ultrasound applications in neurology, including blood-brain barrier opening for localized drug-delivery or neuromodulation using low-cost systems. In addition, increasing the temperature using low-cost and MRI-compatible holographic transducers might be of great interest for many biomedical applications, such as ultrasound hyperthermia, physiotherapy, or high intensity focused ultrasound, where the control of specific thermal patterns is needed.

 

Biography: Noé Jiménez, Ph.D. in Acoustics from the Universitat Politècnica de València, (Spain) in 2015. Noé Jiménez is currently “Ramón y Cajal” Fellow (tenured) at Spanish Research Council. In 2015 he joined the CNRS (UMR6613, France) for a post-doctoral position to research on acoustic metamaterials and in 2017 he joined the Institute of Instrumentation for Molecular Imaging as a “Juan de la Cierva” post-doctoral fellow to research on ultrasonic metamaterials for biomedical applications. He has been visiting researcher at Columbia University (NY, USA) and at the University of Salford (Manchester, UK). He was awarded by the Spanish Royal Society of Physics in 2019 for his scientific contribution to transcranial ultrasound propagation using acoustic holograms. He is the author of 5 patents in the field of biomedical applications of ultrasound, published 44 JCR papers, edited 2 complete books, and 7 book chapters, and participated in more than 200 conferences. He teaches at the Applied Physics department of the Universitat Politècnica de València. His research interests concern from fundamental research in mechanical waves in complex and artificially structured media such as metamaterials, to its application for innovative biomedical ultrasound techniques.

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Seminar 10 -S3, Tuesday 20th November 2022, 14:00 (London Time)

Speaker: TBA

Title: Tba

Abstract: tba.

 

Biography: tab