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PEOPLE@HES-SO - Verzeichnis der Mitarbeitenden und Kompetenzen
PEOPLE@HES-SO - Verzeichnis der Mitarbeitenden und Kompetenzen

PEOPLE@HES-SO
Verzeichnis der Mitarbeitenden und Kompetenzen

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Petit Marie-Anaïs

Petit Marie-Anaïs

Collaboratrice scientifique HES

Hauptkompetenzen

Physique de l'IRM

IRM à champ magnétique faible

Instrumentation IRM

Innovation pédagogique

  • Kontakt

  • Lehre

  • Publikationen

  • Konferenzen

Hauptvertrag

Collaboratrice scientifique HES

Büro: 142

Haute école de santé - Genève
Avenue de Champel 47, 1206 Genève, CH
HEDS-GE
Bereich
Santé
Hauptstudiengang
Technique en radiologie médicale
CAS IRM - Vision-S - Centre de formation continue HES Santé-Social de Genève
  • Physique des artéfacts en IRM
  • IRM à champ magnétique faible
  • Journal club
  • Instrumentation IRM
BSc HES-SO en Technique en radiologie médicale - Haute école de santé - Genève
  • Physique de base de l'IRM
  • Physique des artéfacts en IRM
  • IRM appliquée à la cardiologie
  • IRM à champ magnétique faible
  • Plan de Fourier en IRM
  • Instrumentation IRM

2026

Mechanically Adjustable Inductive Impedance Matching of a Low-Field 0.1 T MRI Solenoid
Wissenschaftlicher Artikel

Petit Marie-Anaïs, Marc Dubois, Dietrich Tanguy, Cooper Ashley, Schmid Jérôme, Stefan Enoch, Bechevet Delphine, Redha Abdeddaïm

IEEE Access, 2026

Link zur Publikation

Zusammenfassung:

Low-field magnetic resonance imaging (MRI) is an attractive route toward affordable, mobile, and energy-efficient scanners, but its intrinsically reduced signal-to-noise ratio (SNR) places stringent requirements on radiofrequency (RF) coil efficiency and impedance matching. This work presents the design, electromagnetic numerical simulations, and experimental validation of a solenoidal RF coil that uses a simple mechanical impedance matching strategy based on a movable non-resonant inductive coupling loop. A 12-turn copper-tube solenoid was implemented in an open vertical-field magnet operating at 0.1 T without a Faraday cage and compared with a reference coil matched by a lumped L-shape network. Numerical simulations and experimental measurements show that translating the non-resonant loop along the solenoid axis strongly modulates the reflection coefficient S??, enabling fine control of the coupling between the 50 Ω transmit/receive chain and the resonant solenoid. At the optimal loop position, the mechanically matched configuration results in higher mean |H| and |B??| fields inside a uniform phantom compared to the conventional L-matched design, with similar field homogeneity. Phantom imaging and nutation experiments confirm that the loop position optimization improves RF efficiency and leads to increased mean SNR across slices, whereas the L-matched coil shows a higher signal but 30% higher noise and 47% broader linewidth. The proposed non-resonant inductive coupling therefore provides a low-cost, low-loss, and easily adjustable approach to impedance matching in low-field MRI, well suited to mobile point-of-care systems.

2025

Learning MRI with ImmeRgaMe :
Wissenschaftlicher Artikel ArODES
exploring the pedagogical potential of an innovative serious game for radiographer training

Marie-Anaïs Petit, Joël Piguet, Belinda Lokaj, Jerome Schmid, Céline Gaignot

Radiography,  2025, 31, 3, 102921

Link zur Publikation

Zusammenfassung:

Introduction : This study aimed to assess the potential of ImmeRgaMe, an innovative 360° immersive serious game, to enhance motivation and engagement in MRI education for first-year radiographer students. Methods : The platform was developed as part of an educational innovation initiative and designed to complement traditional teaching methods. It integrates storytelling, progression mechanisms, and interactive tools to teach MRI safety protocols, physical principles, and clinical methods. Beta testing involved 42 participants (students and educators) who completed standardized surveys to evaluate gameplay, usability, and learning outcomes. The impact of microlearning videos embedded in the game was also assessed through pre- and post-test quizzes with 63 first-year students. Results : The beta version received positive feedback, with over 90 % of participants rating the gameplay and integrated tools as satisfactory. Students demonstrated improved performance in quizzes after using the microlearning videos, with an average score increase of 19 % across tests. Survey results indicated that 97 % of respondents found the videos helpful for understanding course content, and 86 % believed the game could support their progress during MRI internships. Conclusion : ImmeRgaMe effectively fosters student motivation and engagement, bridging the gap between theoretical and practical knowledge in MRI training. While promising, further refinement and broader testing are needed to evaluate its impact on knowledge retention and skills development, as well as its applicability to other imaging modalities. Implications for practice : The implementation of serious games like ImmeRgaMe in radiography education could reshape and modernize traditional teaching methods. By adapting this approach to other imaging modalities, educators could offer immersive and interactive learning experiences, fostering self-regulated learning and aligning training with the complex demands of clinical practice.

Description and Characterization of a Custom Coil for Low-Field 0.1T MRI Application
Wissenschaftlicher Artikel

Petit Marie-Anaïs, Redha Abdeddaïm, Marc Dubois, Bechevet Delphine

2025 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting (AP-S/CNC-USNC-URSI), 2025

Link zur Publikation

Zusammenfassung:

The development of portable and cost-effective Magnetic Resonance Imaging (MRI) systems is critical for improving access to diagnostic imaging. This study validates the use of a loop-solenoid RF coil for good-quality MRI signal acquisition in a low-field 0.1 T system. The coil achieved an S11 of -13.3 dB at 4.55 MHz, with a bandwidth of 19.44 kHz, corresponding to a quality factor of 234.05. NMR signals exhibited a 9.5 ppm magnetic field homogeneity, and gradient echo images were acquired with a calculated Signal-to-Noise Ratio (SNR) of minimum 34. These results confirm the feasibility of low-field MRI for clinical applications.

Tracking Elbow Angles with Printed Dipole Antennas Through the Passive Extraction of S11 Parameter and Resonant Frequency: A Pilot Study
Wissenschaftlicher Artikel

Juliette Seignard, Petit Marie-Anaïs, Florent Moissenet, Jean-Yves Beaulieu, Bechevet Delphine, Gaël Desprès, Nadège Reverdy-Bruas

2025 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2025

Link zur Publikation

Zusammenfassung:

This study explores a battery-free method for monitoring elbow flexion using a printed dipole antenna as a passive sensor. The antenna's resonant frequency and reflection coefficient (S11) change in response to bending, thus offering an innovative alternative to traditional sensor-based systems that require active power. Electromagnetic simulations were performed using CST Microwave Studio over several frequency bands (0-10 GHz, 1.2 – 1.6 GHz, and 0−4GHz) while varying the elbow angle from 0° to 150° in 5° increments. The results indicate that the resonant frequency varies continuously with the flexion angle, especially in the 1.5−2.5GHz band, where high stability and sensitivity were observed. Notable singularities at angles such as 0?,45?,90?, and 135° suggest complex electromagnetic interactions that merit further investigation. Repositioning the feed point proved critical, with optimal measurements obtained on the arm, at 5 mm away from the elbow. These findings confirm that printed dipole antennas can function as passive sensors for joint movement, paving the way for seamless integration into wearable textiles or direct skin applications. Future work will integrate human body models into the simulation, advance prototype development, and incorporate sophisticated signal processing to enhance gesture recognition. This approach represents a promising leap toward lightweight, durable, and energy-efficient wearable sensor technologies.

2015

Assessment of Left Ventricular Ejection Fraction Calculation on Long-axis Views From Cardiac Magnetic Resonance Imaging in Patients With Acute Myocardial Infarction
Wissenschaftlicher Artikel

O. Huttin, Petit Marie-Anaïs, E. Bozec, R. Eschalier, Y. Juillière, F. Moulin, S. Lemoine, C. Selton-Suty, N. Sadoul, D. Mandry, M. Beaumont, J. Felblinger, N. Girerd, P. -Y. Marie

Medicine (Baltimore), 2015

Link zur Publikation

2026

Comparative evaluation of quantitative T1-mapping sequences for musculoskeletal oncologic MRI
Konferenz

Gaignot Céline, B. Delattre, Petit Marie-Anaïs, L. Romanin, U. Goerke, P. -A. Poletti, S. Boudabbous

Swiss Congress of Radiology, 28.05.2026 - 30.05.2026, Lausanne, Suisse

Link zur Konferenz

The pedagogical potential of serious games for radiography education
Konferenz

Gaignot Céline, Petit Marie-Anaïs

European Congress of Radiology, 04.03.2026 - 08.03.2026, Vienne, Autriche

Link zur Konferenz

2025

Gamification in MRI training: enhancing knowledge, skills, safety and care
Konferenz

Petit Marie-Anaïs, Gaignot Céline

European Society for Magnetic Resonance in Medicine and Biology (ESMRMB) - European Federation of Radiographer Societies (EFRS) working group session, 08.10.2025 - 11.10.2025, Marseille, France

Link zur Konferenz

Loop Inductive Coupling for Efficient Solenoid Matching in Low-Field MRI study
Konferenz

Petit Marie-Anaïs, Redha Abdeddaïm, Marc Dubois, Bechevet Delphine

European Society for Magnetic Resonance in Medicine and Biology (ESMRMB), 08.10.2025 - 11.10.2025, Marseille, France

Link zur Konferenz

The benefits of magnetic resonance simulation for emerging technologies: an emblematic application to magnetic-resonance-guided gamma imaging
Konferenz

Chênes Christophe, P. Galve, Petit Marie-Anaïs, J. Lopez Herraiz

European Society for Magnetic Resonance in Medicine and Biology (ESMRMB), 08.10.2025 - 11.10.2025, Marseille, France

Link zur Konferenz

Tracking elbow angles with printed dipole antennas through the passive extraction of S11 parameter and resonant frequency:
Konferenz ArODES
a pilot study

Juliette Seignard, Marie-Anaïs Petit, Florent Moissenet, Jean-Yves Beaulieu, Delphine Bechevet, Gaël Déprès, Nadège Reverdy-Bruas

2025 International Conference on Electromagnetics in Advanced Applications (ICEAA)

Link zur Konferenz

Zusammenfassung:

This study explores a battery-free method for monitoring elbow flexion using a printed dipole antenna as a passive sensor. The antenna's resonant frequency and reflection coefficient (S11) change in response to bending, thus offering an innovative alternative to traditional sensor-based systems that require active power. Electromagnetic simulations were performed using CST Microwave Studio over several frequency bands (0-10 GHz, 1.2 – 1.6 GHz, and 0−4GHz) while varying the elbow angle from 0° to 150° in 5° increments. The results indicate that the resonant frequency varies continuously with the flexion angle, especially in the 1.5−2.5GHz band, where high stability and sensitivity were observed. Notable singularities at angles such as 0°,45°,90°, and 135° suggest complex electromagnetic interactions that merit further investigation. Repositioning the feed point proved critical, with optimal measurements obtained on the arm, at 5 mm away from the elbow. These findings confirm that printed dipole antennas can function as passive sensors for joint movement, paving the way for seamless integration into wearable textiles or direct skin applications. Future work will integrate human body models into the simulation, advance prototype development, and incorporate sophisticated signal processing to enhance gesture recognition. This approach represents a promising leap toward lightweight, durable, and energy-efficient wearable sensor technologies.

Description and characterization of a custom coil for low-field 0.1T MRI application
Konferenz ArODES

Marie-Anaïs Petit, Redha Abdeddaïm, Michel Dubois, Delphine Bechevet

2025 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting (AP-S/CNC-USNC-URSI)

Link zur Konferenz

Zusammenfassung:

The development of portable and cost-effective Magnetic Resonance Imaging (MRI) systems is critical for improving access to diagnostic imaging. This study validates the use of a loop-solenoid RF coil for good-quality MRI signal acquisition in a low-field 0.1 T system. The coil achieved an S11 of -13.3 dB at 4.55 MHz, with a bandwidth of 19.44 kHz, corresponding to a quality factor of 234.05. NMR signals exhibited a 9.5 ppm magnetic field homogeneity, and gradient echo images were acquired with a calculated Signal-to-Noise Ratio (SNR) of minimum 34. These results confirm the feasibility of low-field MRI for clinical applications.

2024

A serious game for personalized learning of MRI techniques and physics as part of the radiographer training program
Konferenz

Gaignot Céline, Petit Marie-Anaïs, Ismaili Guillaume, Piguet Joël, Sagne Aurèle

Swiss Congress of Radiology, 20.06.2024 - 22.06.2024, Lausanne, Suisse

Link zur Konferenz

2023

Low Field MRI: Need for a New Paradigm?
Konferenz

Petit Marie-Anaïs

Swiss Printed Electronics Day, 04.07.2023 - 04.07.2023, Genève, Suisse

Link zur Konferenz

2013

Evaluation of left ventricular systolic function by cardiac MRI after an acute myocardial infarction: comparison of short and long axis quantification for left ventricular ejection fraction calculation
Konferenz

Petit Marie-Anaïs, O. Huttin, R. Eschalier, C. Selton-Suty, P. -Y. Marie, J. Felblinger, M. Beaumont

European Society for Magnetic Resonance in Medicine and Biology (ESMRMB), 03.10.2013 - 05.10.2013, Toulouse, France

Link zur Konferenz

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