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15

A dedicated physicist passionate for neurosciences


I have focused the last 15 years of my career on learning how best to implement computational methods in neurology and psychiatry. Having a background in Physics, a master's in Biomedical Sciences and a PhD in Medical Pathophysiology, my research was a pioneer in Brazil on employing functional connectivity MRI in epilepsy. However, to pursue my ambitions of enhancing the understanding of the mind's complexity, I have been mining neuroimaging-informed phenotypes in many other diseases and syndromes. This topic guided my research basicaly in five instituions: 1. Unicamp (under the supervision of Professor Fernando Cendes); 2. MIT (under the supervision of Professor Suzanne Corkin); 3. UC-Berkeley (under the supervision of Professor Mark D'Esoposito); 4. USP (under the supervision of Professor Geraldo Bussato); and 5. CHU-Nimes (under the supervision of Professor Jean-Paul BeregiNowadays, I’m eager to comprehend why people kill themselves? I’m convinced that suicide is a distinct socio-neuropsychiatry disorder (i.e. not part of other pathological condition) triggered by the psychological dimension of pain. Using cutting-edge neuroimaing approaches, I aim to collaborete ifor model such complex system.


Journal articles15 documents

  • J. Greffier, J. Frandon, A. Larbi, J. Beregi, F. Pereira. CT iterative reconstruction algorithms: a task-based image quality assessment. European Radiology, Springer Verlag, 2020, 30 (1), pp.487-500. ⟨10.1007/s00330-019-06359-6⟩. ⟨hal-03353682⟩
  • J. Greffier, J. Frandon, F. Pereira, A. Hamard, J. Beregi, et al.. Optimization of radiation dose for CT detection of lytic and sclerotic bone lesions: a phantom study. European Radiology, Springer Verlag, 2020, 30 (2), pp.1075-1078. ⟨10.1007/s00330-019-06425-z⟩. ⟨hal-03353023⟩
  • J. Greffier, F. Pereira, A. Hamard, T. Addala, J.P. Beregi, et al.. Effect of tin filter-based spectral shaping CT on image quality and radiation dose for routine use on ultralow-dose CT protocols: A phantom study. Diagnostic and Interventional Imaging, Elsevier, 2020, 101 (6), pp.373-381. ⟨10.1016/j.diii.2020.01.002⟩. ⟨hal-03350697⟩
  • J. Frandon, G. Moliner, J.P. Beregi, F. Pereira, J. Greffier, et al.. Comparison of noise-magnitude and noise-texture across two generations of iterative reconstruction algorithms from three manufacturers. Diagnostic and Interventional Imaging, Elsevier, 2019, 100 (7-8), pp.401--410. ⟨10.1016/j.diii.2019.04.006⟩. ⟨hal-02931820⟩
  • J. Greffier, A. Larbi, J. Frandon, P.A. Daviau, J.P. Beregi, et al.. Influence of iterative reconstruction and dose levels on metallic artifact reduction: A phantom study within four CT systems. Diagnostic and Interventional Imaging, Elsevier, 2019, 100 (5), pp.269--277. ⟨10.1016/j.diii.2018.12.007⟩. ⟨hal-02935392⟩
  • J. Greffier, C. Etard, O. Mares, F. Pereira, D. Defez, et al.. Patient dose reference levels in surgery a multicenter study. European Radiology, Springer Verlag, 2019, 29 (2), pp.674-681. ⟨10.1007/s00330-018-5600-2⟩. ⟨hal-02521609⟩
  • J. Greffier, J. Frandon, A. Larbi, D. Om, J.P. Beregi, et al.. Noise assessment across two generations of iterative reconstruction algorithms of three manufacturers using bone reconstruction kernel. Diagnostic and Interventional Imaging, Elsevier, 2019, 100 (12), pp.763-770. ⟨10.1016/j.diii.2019.08.003⟩. ⟨hal-02859900⟩
  • A. Larbi, X. Stefanovic, F. Pereira, G. Moliner, S. Ovtchinnikoff, et al.. Assessment of patient's peak skin dose during abdominopelvic embolization using radiochromic (Gafchromic) films. Diagnostic and Interventional Imaging, Elsevier, 2018, 99 (5), pp.321--329. ⟨10.1016/j.diii.2017.12.008⟩. ⟨hal-02365076⟩
  • A. Larbi, C. Orliac, J. Frandon, F. Pereira, A. Ruyer, et al.. Detection and characterization of focal liver lesions with ultra-low dose computed tomography in neoplastic patients. Diagnostic and Interventional Imaging, Elsevier, 2018, 99 (5), pp.311--320. ⟨10.1016/j.diii.2017.11.003⟩. ⟨hal-02337852⟩
  • J. Greffier, C. van Ngoc Ty, G. Bonniaud, G. Moliner, B. Ledermann, et al.. Assessment of peak skin dose in interventional cardiology: A comparison between Gafchromic film and dosimetric software em.dose. Physica Medica, Elsevier, 2017, 38, pp.16 - 22. ⟨10.1016/j.ejmp.2017.05.044⟩. ⟨hal-01893718⟩
  • J. Greffier, G. Moliner, F. Pereira, L. Cornillet, B. Ledermann, et al.. Assessment of Patient's Peak Skin Dose Using Gafchromic Films During Interventional Cardiology Procedures: Routine Experience Feedback. Radiation Protection Dosimetry, Oxford University Press (OUP), 2017, 174 (3), pp.395-405. ⟨10.1093/rpd/ncw191⟩. ⟨hal-01900855⟩
  • J. Greffier, C. van Ngoc Ty, Mathieu Agelou, J. Coulot, B. Ledermann, et al.. Impact of the calibration conditions of XR-RV3 films on peak skin dose measurements in interventional radiology. Radiation Protection Dosimetry, Oxford University Press (OUP), 2017, 174 (2), pp.207-215. ⟨10.1093/rpd/ncw116⟩. ⟨hal-01878993⟩
  • J. Greffier, F. Macri, A. Larbi, A. Fernandez, F. Pereira, et al.. Dose reduction with iterative reconstruction in multi-detector CT: What is the impact on deformation of circular structures in phantom study?. Diagnostic and Interventional Imaging, Elsevier, 2016, 97 (2), pp.187 - 196. ⟨10.1016/j.diii.2015.06.019⟩. ⟨hal-01913366⟩
  • J. Greffier, F. Macri, A. Larbi, A. Fernandez, E. Khasanova, et al.. Dose reduction with iterative reconstruction: Optimization of CT protocols in clinical practice. Diagnostic and Interventional Imaging, Elsevier, 2015, 96 (5), pp.477 - 486. ⟨10.1016/j.diii.2015.02.007⟩. ⟨hal-01934900⟩
  • Helka Ozelo, AndrĂ©a Alessio, MaurĂ­cio Sercheli, Elizabeth Bilevicius, Tatiane Pedro, et al.. Pattern changes of EEG oscillations and BOLD signals associated with temporal lobe epilepsy as revealed by a working memory task. BMC Neuroscience, BioMed Central, 2014, -, 15, pp.52. ⟨10.1186/1471-2202-15-52⟩. ⟨hal-01952404⟩