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October 1, 2018 | Faster, more energy efficient neural networks with NeuroSpike

neurospike list 250List, a CEA Tech institute, successfully completed the optimized execution of a complete convolutional neural network impulse model for the first time ever using its patented NeuroSpike calculator.

Convolutional neural networks (CNN) are widely used in the latest 2D data processing methods—and, especially, image recognition and classification. List recently developed a calculator that makes it possible to execute CNNs optimally based on impulse models[1], which, theoretically, can reduce the hardware resources and energy required to process data (the “inference” step).

The use of impulse models for CNNs requires coding the data as impulses that are transmitted between a wide range of artificial neurons arranged in different types of layers. To get the most out of the data coded in this way and complete the calculations as efficiently as possible, a special hardware architecture is also required. List* developed its NeuroSpike calculator for this purpose. It is the first hardware architecture that enables the efficient calculation of a complete CNN’s impulse inference.

NeuroSpike uses eleven times less energy and is four times faster than impulse-based architectures used to calculate 2D convolution inferences. It is protected by three patents.

[1] Impulse models are a way of processing data coded as impulses transmitted within a neural network. The artificial impulse neurons use less complex and more energy efficient operators than traditional models, but they require more memory.

*List earned the prestigious Institut Carnot seal in 2006 (Institut Carnot TN@UPSaclay).




September 24, 2018 | DOSEO expands training for medical physicists

doseo formation ListThe DOSEO radiotherapy research and training center recently created a new training course combining theoretical and hands-on learning over three two-day sessions. The new course is being offered in response to high demand from medical physicists.

DOSEO’s mission is to ensure that new radiotherapy technologies are used optimally to guarantee maximum patient safety. The center also trains radiotherapy students and practitioners. DOSEO recently presented its latest training course to 70 attendees at Journée des Manipulateurs Radio 2018, an event for radiotherapy professionals.

DOSEO already offers a course in metrology for radiotherapy that draws on the center’s broad, deep knowledge of metrology. The new course, for medical physicists, was created at the request of the French national nuclear safety board (ASN). It focuses on measuring doses in stereotaxic conditions or, in other words, in minibeam therapy. So far the course has been so popular that several additional dates have been scheduled.

A third training course will provide physicists with an introduction to dose measurement in imaging, which requires specific protocols. The topic was the subject of the AID-IGRT project funded by the French national research agency (ANR), which set out to control the doses received by patients in image-guided radiotherapy. 3D calculation software was developed to measure the doses delivered by the embedded imaging systems, generating a personalized calculation of the dose received by each of the patient’s organs depending on the patient’s morphology and the unique parameters of the treatment protocol.


Philippe Giraud, President of AFCOR (the Association for Continuing Education in Oncology and Radiotherapy) and member of the DOSEO Steering Committee:

“DOSEO is the only technical facility that has state-of-the-art equipment and high-level experts on the same premises available to practitioners, dosimetry technicians, and medical physicists for training on the latest radiobiology, imaging, and medical physics techniques. And, because DOSEO is near INSTN (France’s national nuclear science and technology institute), it has access to vital medical physics know-how. Beyond training, DOSEO is also an active participant in research projects, helping to transfer the results of the projects to industry with Aviesan, France’s national alliance for the life and health sciences. It is our main resource for medical physics and radioprotection.”

 DOSEO website:




August 30, 2018 | More accurate identification of volatile compounds

List composes volatilsThe performance of systems used to identify volatile compounds has been enhanced substantially thanks to research conducted under the Essaim project. Improvements were made to both the sensors and the data acquisition and processing methods.

Functionalized surface acoustic wave (SAW) sensors identify volatile compounds by detecting variations in the resonance frequency the compounds generate when they are adsorbed at the sensors' surface. In research conducted under the Essaim project, List, a CEA Tech institute, developed new SAW sensors and a multi-sensor method capable of obtaining a more specific "signature" than conventional SAW approaches.

Until now, organic compounds have been identified solely based on variations in the sensors' resonance frequency. The new method uses a representation of the data based on the equations that govern the sensors' physical parameters. The method, which is more complex, makes it possible to acquire more accurate variables. The characteristics extracted using the method resulted in classification rates in excess of 96% on test databases—an improvement of more than 7% in some cases. The new method can identify compounds and determine how many compounds are in a mix to generate a concentration profile.

The method could be of use for a variety of applications, from detecting toxic chemicals to controlling the quality of food. It was tested on different types of coffee with a success rate of 75%, compared to 62% previously in the best cases. The software is fully automated, making it usable even by non-specialists. All of these improvements have been integrated into PACT.

*List earned the prestigious Institut Carnot seal in 2006 (Institut Carnot TN@UPSaclay).




June 28, 2018 | Toward more effective dose control in electronic brachytherapy

curietherapie 250A dosimetric reference was developed to more effectively control doses administered to breast cancer patients receiving electronic brachytherapy treatment.

The use of intraoperative electronic brachytherapy to treat breast cancer is on the rise. The treatment presents a number of benefits, especially in terms of patient comfort and cost. The INTRABEAM® system by Zeiss is the only system used in France, where it is available in around a dozen hospitals.

The system uses low-energy X-rays generated by miniature tubes whose ends are fitted with sphere-shaped applicators sized to fit the surgical cavity left after the tumor is removed. The device delivers targeted, localized radiation.

On the recommendation of the French National Authority for Health, LNHB, France's national metrology laboratory for ionizing radiation and a laboratory of CEA Tech institute List*, established a dosimetric reference for the INTRABEAM® system independent of the reference provided by the manufacturer. The researchers used a conventional X-ray generator to reproduce the beam emitted by the system's source associated with a sphere-shaped applicator. The dose delivered by the beam was measured, and it can now be used to calibrate detectors, in turn enabling hospital staff to calibrate the source used in treatment.

The reference established must now be compared with the reference of another metrology lab for validation. This new method for controlling the dose administered to patients could then be used for other existing intraoperative radiotherapy systems (Xoft Axxent System, Esteya, SRT-100 TM, Papillon, etc.).

*List earned the prestigious Institut Carnot seal in 2006 (Institut Carnot TN@UPSaclay).




25 juin 2018 | Paris-Region Smart Robotics Day

bandeau robotics

List logo invit

Valérie Pécresse
Présidente de la Région Île-de-France

Alexandra Dublanche
Vice-présidente en charge du développement économique,
de l’agriculture et de la ruralité


Philippe Watteau
Directeur du CEA List

ont le plaisir de vous inviter au Paris Region Smart Robotics Day

Lundi 25 juin 2018 à 13h30
La Région Île-de-France rassemble sur son territoire un écosystème particulièrement foisonnant en robotique et intelligence artificielle. En juin 2017, elle a lancé Smart Industrie, une initiative ambitieuse pour structurer cet écosystème et impulser la transformation numérique de l’industrie francilienne. La création du Digital Innovation Hub DIGIHALL en est une illustration emblématique : il permettra d’accompagner plus efficacement les entreprises dans leur démarche de différentiation et d’ouverture au marché européen de l’innovation.
Venez découvrir de nouvelles opportunités
pour votre entreprise !
Conseil régional d’Île-de-France
2 Rue Simone Veil, 93400 Saint-Ouen
Métro : Ligne 13, station Mairie de Saint-Ouen
bouton inscription 03