dr. G.P.R. Lajoinie (Guillaume)

Assistant Professor
TNW-POF
Horst Complex ME214A
g.p.r.lajoinie@utwente.nl
+31534894213
Business card

After performing a master thesis in the Biomedical Photonic Imaging Group (BMPI) of the University of Twente, I graduated from Ecole Centrale de Lyon in 2011. I then came back to the university of Twente to fulfill a PhD in the Physics Of Fluids Group, under the supervision of prof. Michel Versluis, on ultrasound contrast agents and graduated in 2015. I am now a assistant professor in the Physics Of Fluids Group, working on ultrasound, microscale fluid dynamics, bubble physics, and deep learning for ultrasound super-resolution contrast agents.Ā 

Expertise

  • Physics

    • Ultrasound
    • Bubbles
    • Contrast
    • Acoustics
    • Pressure
    • Droplet

  • Biochemistry, Genetics and Molecular Biology

    • Microbubble

  • Medicine and Dentistry

    • In Vitro

Organisations

My research interests include a broad array of microscale phenomena, in particular these that can lead to the generation of contrast for ultrasound and photoacoustics. Such phenomena often involve cavitation, phase change and heat and mass transfer. I also have a keen interest in therapeutic applications of microbubbles for sonoporation, sonoprinting and gene therapy. Studying microscale physics also requires a precise control of the particles properties, and in particular their size. Part of my research activities therefore focuses on production methods and precise control of agents created using microfluidics. High-speed imaging is a critical tool in such studies and allows for the direct visualization of the response of the contrast agents. The recent arrival of ultrafast plane-wave ultrasound technology combined with monodisperse microbubbles opens new possibilities for highly controlled and localized drug delivery and greatly improved diagnostics for personalized medicine.

Publications

2024
Transverse flow under oscillating stimulation in helical square ducts with cochlea-like geometrical curvature and torsion, 165-174. Harte, N. C., Obrist, D., Caversaccio, M., Lajoinie, G. P. R. & Wimmer, W.https://doi.org/10.1016/j.euromechflu.2024.07.001PROTEUS: A Physically Realistic Contrast-Enhanced Ultrasound Simulator—Part I: Numerical Methods, 1 (E-pub ahead of print/First online). Blanken, N., Heiles, B., Kuliesh, A., Versuis, M., Jain, K., Maresca, D. & Lajoinie, G.https://doi.org/10.1109/TUFFC.2024.3427850High-Speed Optical Characterization of Protein-and-Nanoparticleā€“Stabilized Microbubbles for Ultrasound-Triggered Drug Release, 1099-1107 (E-pub ahead of print/First online). Nawijn, C. L., Segers, T., Lajoinie, G., Berg, S., Snipstad, S., Davies, C. d. L. & Versluis, M.https://doi.org/10.1016/j.ultrasmedbio.2024.03.011Dissolution and vaporization of superheated droplets and capsules. University of Twente. Saleem, M. S.https://doi.org/10.3990/1.9789036561655Validation of ultrasound velocimetry and computational fluid dynamics for flow assessment in femoral artery stenotic disease, Article 2450001. van de Velde, L., van Helvert, M., Engelhard, S., Ghanbarzadeh-Dagheyan, A., Mirgolbabaee, H., Voorneveld, J., Lajoinie, G., Versluis, M., Reijnen, M. M. P. J. & Jebbink, E. G.https://doi.org/10.1117/1.JMI.11.3.037001Active Learning Strategies onĀ aĀ Real-World Thyroid Ultrasound DatasetIn Data Augmentation, Labelling, and Imperfections - 3rd MICCAI Workshop, DALI 2023 Held in Conjunction with MICCAI 2023, Proceedings (pp. 127-136). Springer. Sreedhar, H., Lajoinie, G. P. R., Raffaelli, C. & Delingette, H.https://doi.org/10.1007/978-3-031-58171-7_13A unifying Rayleigh-Plesset-type equation for bubbles in viscoelastic media, 1593-1605. Oratis, A. T., Dijs, K., Lajoinie, G., Versluis, M. & Snoeijer, J. H.https://doi.org/10.1121/10.0024984Control of monodisperse microbubble properties for high-precision medical applications. University of Twente. van Elburg, B.https://doi.org/10.3990/1.9789036559683
2023
Wall Shear Stress and Pressure Fluctuations under Oscillating Stimulation in Helical Square Ducts with Cochlea-like Geometrical Curvature and TorsionIn 2023 45th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC) (pp. 1-7). IEEE. Harte, N. C., Obrist, D., Caversaccio, M. D., Lajoinie, G. P. R. & Wimmer, W.https://doi.org/10.1109/EMBC40787.2023.10340844Dependence of sonoporation efficiency on microbubble size: An in vitro monodisperse microbubble study, 747-755. van Elburg, B., Deprez, J., van den Broek, M., De Smedt, S. C., Versluis, M., Lajoinie, G., Lentacker, I. & Segers, T.https://doi.org/10.1016/j.jconrel.2023.09.047A unifying Rayleigh-Plesset-type equation for bubbles in viscoelastic media. ArXiv.org. Oratis, A. T., Dijs, K., Lajoinie, G., Versluis, M. & Snoeijer, J. H.https://doi.org/10.48550/arXiv.2311.00484Microbubble formation by flow focusing: Role of gas and liquid properties, and channel geometry, Article A27. Cleve, S., Lassus, A., Diddens, C., Van Elburg, B., Gaud, E., Cherkaoui, S., Versluis, M., Segers, T. & Lajoinie, G.https://doi.org/10.1017/jfm.2023.704Dependence of sonoporation efficiency on microbubble size: An in vitro monodisperse microbubble study , A277-A277. van Elburg, B., Deprez, J., Van den broek, M., De smedt, S., Versluis, M., Lajoinie, G., Lentacker, I. & Segers, T.https://doi.org/10.1121/10.0023517Towards in vivo immunotherapy using high intensity focused ultraosund, A278-A278. Lajoinie, G., Engelen, Y., Breckpot, K., Krysko, D., De smedt, S. & Lentacker, I.https://doi.org/10.1121/10.0023519
2022
Super-Resolved Microbubble Localization in Single-Channel Ultrasound RF Signals Using Deep Learning, 2532-2542. Blanken, N., Wolterink, J. M., Delingette, H., Brune, C., Versluis, M. & Lajoinie, G.https://doi.org/10.1109/TMI.2022.3166443A theoretical framework for acoustically produced luminescence: From thermometry to ultrasound pressure field mapping, Article 118940. Michels, S. E., Lajoinie, G., Hedayatrasa, S., Versluis, M., Kersemans, M. & Smet, P. F.https://doi.org/10.1016/j.jlumin.2022.118940Blood Flow Quantification with High-Frame-Rate, Contrast-Enhanced Ultrasound Velocimetry in Stented Aortoiliac Arteries: In Vivo Feasibility, 1518-1527. Engelhard, S., van Helvert, M., Voorneveld, J., Bosch, J. G., Lajoinie, G., Jebbink, E. G., Reijnen, M. M. P. J. & Versluis, M.https://doi.org/10.1016/j.ultrasmedbio.2022.03.016Time-resolved absolute radius estimation of vibrating contrast microbubbles using an acoustical camera, Article 3993, 3993-4003. Spiekhout, S., Voorneveld, J., Elburg, B. v., Renaud, G., Segers, T., Lajoinie, G. P. R., Versluis, M., Verweij, M. D., de Jong, N. & Bosch, J. G.https://doi.org/10.1121/10.0011619Evaluation of Liposome-Loaded Microbubbles as a Theranostic Tool in a Murine Collagen-Induced Arthritis Model, Article 17, 17-23. Deprez, J., Roovers, S., Lajoinie, G., Dewitte, H., Decruy, T., Coudenys, J., Descamps, B., Vanhove, C., Versluis, M., Elewaut, D., Jacques, P., Smedt, S. C. D. & Lentacker, I.https://doi.org/10.3390/scipharm90010017
2021
Time-resolved velocity and pressure field quantification in a flow-focusing device for ultrafast microbubble production, Article 114202. Cleve, S., Diddens, C., Segers, T., Lajoinie, G. & Versluis, M.https://doi.org/10.1103/PhysRevFluids.6.114202US Velocimetry in Participants with Aortoiliac Occlusive Disease, 332-338. Engelhard, S., Helvert, M. v., Voorneveld, J., Bosch, J. G., Lajoinie, G. P. R., Versluis, M., Jebbink, E. G. & Reijnen, M. M. P. J.https://doi.org/10.1148/radiol.2021210454Ultrasound-Mediated Drug Delivery With a Clinical Ultrasound System: In Vitro Evaluation, Article 768436. de Maar, J. S., Rousou, C., van Elburg, B., Vos, H. J., Lajoinie, G. P. R., Bos, C., Moonen, C. T. W. & Deckers, R.https://doi.org/10.3389/fphar.2021.768436Ultrasound-enhanced mass transfer during the growth and dissolution of surface gas bubbles, Article 121069. Peñas, P., Moreno Soto, Á., Lohse, D., Lajoinie, G. & van der Meer, D.https://doi.org/10.1016/j.ijheatmasstransfer.2021.121069Fast and High-Resolution Ultrasound Pressure Field Mapping Using Luminescent Membranes, Article 2100085. Michels, S. E., Kersemans, M., Versluis, M., Lajoinie, G. & Smet, P. F.https://doi.org/10.1002/adom.202100085Multi-timescale Microscopy Methods for the Characterization of Fluorescently-labeled Microbubbles for Ultrasound-Triggered Drug Release, Article e62251. Nawijn, C., Segers, T., Lajoinie, G., Mørch, Ý., Berg, S., Snipstad, S., de Lange Davies, C. & Versluis, M.https://doi.org/10.3791/62251

Research profiles

For the past 6 years, I am involved in teaching medical acoustics to master students with Prof. Michel Versluis. I have also supervised several bachelor thesis students and 9 master thesis students.

Affiliated study programs

Courses academic year 2023/2024

Courses in the current academic year are added at the moment they are finalised in the Osiris system. Therefore it is possible that the list is not yet complete for the whole academic year.

Courses academic year 2022/2023

The research projects in which I am involved revolve around the idea of using microscale physics in order to generate contrast or induce therapy down to the single cell level. These mechanisms involve in particular phase change, microbubbles resonance and controlled production of complex particles.

Recently, I have focused on the use of these physical mechanisms combined with deep-learning for super-resolution ultrasound imaging.

Current projects

Ultrafast plane-wave ultrasound imaging

Plane-wave ultrasound allows us to image at several thousands of frames per second and thereby image biological processes that are otherwise too fast. In particular, we aim at flow parameters quantification using plane ultrasound and microbubble contrast agents, at a sub-millisecond timescale and resolve the details of the blood flow in relation to stents or vascular diseases.

Ultrasound super-resolution from raw ultrasound data using deep learning

Recently, ultrasound localization microscopy (ULM) has received much attention as a method to overcome the diffraction limit in ultrasound imaging. However, ULM relies on low concentrations of microbubbles, ultimately resulting in long acquisition times. In this project, we investigate an alternative super-resolution approach, based on deconvolution of the raw ultrasound data with neural networks. We focus on low-frequency ultrasound in order to image deep in the body, which is needed for cardiovascular diseases or cancer. To that end, we train the neural network to recognize the specific nonlinear feature of echoes generated by monodisperse bubbles (uniform in size).

Lab-on-a-Chip Microfluidics.

The formation of microscopic droplets, bubbles and particles with an accurately controlled and narrow size distribution is crucial in a wide variety of applications and products. For example, in medical applications such as diagnostic ultrasound imaging, targeted drug delivery, and drug inhalation therapy, but also in inkjet printing, cosmetics and in modern food industry.

Ultrasound Therapy with microbubbles.

The use of ultrasound contrast agents as local drug delivery systems continues to grow. Microbubbles are an interesting vehicle that can carry a variety of payloads from functional nanoparticles to RNA loaded liposomes. We study here the physical aspects that lead to the controlled release of the payload upon ultrasound exposure. The effects on cells and mechanisms such as sonoporation or sonoprinting, that can temporarily open cell membranes, are also of prime interest. The project includes the study of single bubbles and of their interaction with 3D cell structures, in parallel, and makes use of ultra-high-speed imaging, fluorescence imaging, ultrasound, optical microscopy and confocal imaging.

Ultrasound Imaging.

Contrast agents for ultrasound imaging are used daily in the clinics in order to, for example, assess blood perfusion or give information on tumor malignancy. In this project, we study the formation and the behavior of microbubbles in response to ultrasound in order to find innovative contrast mode for ultrasound imaging, and provide new information for diagnosis.

High-speed imaging.

High-speed imaging is a core technique for the study of ultrasound contrast agents. This project aims at designing and implementing new techniques in order to push further the exploration of small length scales and short time scales.

Finished projects

Multimodal agents: ultrasound and photoacoustics

Ultrasound and photoacoustic imaging are complementary by many aspects. Here, we design agents consisting of microbubbles or microcapsules, that are made sensitive to light by the addition of a dye in the bubble oil coating or in the polymer shell of the capsules. The fast heat and mass transfer on the microscale combined with the dynamics of microbubbles allow these agents to mechanically respond to both laser irradiation and ultrasound excitation. These agents could thus be use in a multimodal imaging setting including ultrasound and photoacoustics.

Phase-change agents for ultrasound.

Microbubbles have undeniably proven their value as ultrasound contrast agents, both for imaging and therapy. However, their micron size confines them to the blood vessels, making them exclusively blood pool agents. In this project, we study the vaporization mechanisms of superheated perfluorocarbon droplets that can be made small enough to extravasate and subsequently turned into microbubbles, using ultrasound as trigger. These microbubbles can then be used beyond the endothelial barrier for both diagnosis and therapy.

Address

University of Twente

Horst Complex (building no. 20), room ME214A
De Horst 2
7522 LW Enschede
Netherlands

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