Ilkka Nissilä

Research Fellow

Research outputs

  1. 2019
  2. Published

    Hemodynamic responses to emotional speech in two-month-old infants imaged using diffuse optical tomography

    Shekhar, S., Maria, A., Kotilahti, K., Huotilainen, M., Heiskala, J., Tuulari, J. J., Hirvi, P., Karlsson, L., Karlsson, H. & Nissilä, I., 1 Dec 2019, In : Scientific Reports. 9, 1, p. 1-15 4745.

    Research output: Contribution to journalArticleScientificpeer-review

  3. 2018
  4. Published

    Emotional Processing in the First 2 Years of Life: A Review of Near-Infrared Spectroscopy Studies

    Maria, A., Shekhar, S., Nissilä, I., Kotilahti, K., Huotilainen, M., Karlsson, L., Karlsson, H. & Tuulari, J. J., 1 Sep 2018, In : Journal of Neuroimaging. 28, 5, p. 441-454 14 p.

    Research output: Contribution to journalReview ArticleScientificpeer-review

  5. Published

    Affective and non-affective touch evoke differential brain responses in 2-month-old infants

    Jönsson, E. H., Kotilahti, K., Heiskala, J., Backlund Wasling, H., Olausson, H., Croy, I., Mustaniemi, H., Hiltunen, P., Tuulari, J. J., Scheinin, N. M. & 3 othersKarlsson, L., Karlsson, H. & Nissilä, I., 1 Apr 2018, In : NeuroImage. 169, p. 162-171 10 p.

    Research output: Contribution to journalArticleScientificpeer-review

  6. 2015
  7. Published

    Nonlinear approach to difference imaging in diffuse optical tomography

    Mozumder, M., Tarvainen, T., Seppänen, A., Nissilä, I., Arridge, S. R. & Kolehmainen, V., 2015, In : Journal of Biomedical Optics. 20, 10, p. 105001

    Research output: Contribution to journalArticleScientificpeer-review

  8. 2014
  9. Published

    Respiratory and non-respiratory arousals induce changes in intracranial oxygenation in sleep disordered patients measured with near-infrared spectroscopy

    Toppila, J., Kotilahti, K., Näsi, T., Virtanen, J., Nissilä, I., Salmi, T. & Bachour, A., Sep 2014, In : Journal of Sleep Research. 23, p. 282-283 2 p.

    Research output: Contribution to journalMeeting AbstractScientificpeer-review

  10. Published

    High-Density Diffuse Optical Imaging of Total Hemoglobin Changes to Emotionally Valenced Speech in Two-Month Old Infants

    Nissilä, I., Shekhar, S., Kotilahti, K., Heiskala, J., Mustaniemi, H., Heino, J., Huotilainen, M. & Karlsson, H., 2014, Biomedical OpticsMiami, Florida United StatesApril 26-30, 2014. Optical Society of America

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  11. 2013
  12. Published

    Effect of task-related extracerebral circulation on diffuse optical tomography: experimental data and simulations on the forehead

    Näsi, T., Mäki, H., Hiltunen, P., Heiskala, J., Nissilä, I., Kotilahti, K. & Ilmoniemi, R. J., 2013, In : Journal of Biomedical Optics. 4, 3, p. 412-426

    Research output: Contribution to journalArticleScientificpeer-review

  13. 2012
  14. Published

    Method for assessing the contribution of systemic circulation in near-infrared spectroscopy signals

    Näsi, T., Mäki, H., Hiltunen, P., Heiskala, J., Nissilä, I., Kotilahti, K. & Ilmoniemi, R., 2012, Mian Long (ed.): IFMBE Proceedings (WC2012, Beijing, China), Vol 39, pages 10301033, 2012. p. 10301033

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  15. 2011
  16. Published

    Magnetic-Stimulation-Related Physiological Artifacts in Hemodynamic Near-Infrared Spectroscopy Signals

    Näsi, T., Kotilahti, K., Mäki, H., Nissilä, I., Haapalahti, P. & Ilmoniemi, R., 2011, In : PloS one. 6, 8, p. 1-8 e24002.

    Research output: Contribution to journalArticleScientificpeer-review

  17. Published

    State space regularization in the nonstationary inverse problem for diffuse optical tomography

    Hiltunen, P., Särkkä, S., Nissilä, I., Lajunen, A. & Lampinen, J., 2011, In : Inverse Problems. 27, 2, 15 p., 025009.

    Research output: Contribution to journalArticleScientificpeer-review

  18. 2010
  19. Published

    3D level set reconstruction of model and experimental data in Diffuse Optical Tomography

    Schweiger, M., Dorn, O., Zacharopoulos, A., Nissilä, I. & Arridge, S. R., 2010, In : Optics Express. 18, 1, p. 150-164

    Research output: Contribution to journalArticleScientificpeer-review

  20. Published

    Amplitudes of rTMS-evoked NIRS responses correlate with changes in heart rate

    Näsi, T., Mäki, H., Kotilahti, K., Nissilä, I. & Ilmoniemi, R. J., 2010, 29th International Congress of Clinical Neurophysiology, Kobe Japan, October 28 - November 1, 2010. p. S148

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  21. Published

    Characterizing Cerebral and Extracerebral Components in TMS-Evoked Near-Infrared Spectroscopy Signals

    Mäki, H., Näsi, T., Kotilahti, K., Nissilä, I., Meriläinen, P. & Ilmoniemi, R. J., 2010, 17th International Conference on Biomagnetism (Biomag 2010), Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Supek, S. & Susac, A. (eds.). p. 88-91

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  22. Published

    Correlation of visual-evoked hemodynamic responses and potentials in human brain

    Näsi, T., Kotilahti, K., Noponen, T., Nissilä, I., Lipiäinen, L. & Meriläinen, P., 2010, In : Experimental Brain Research. 202, 3, p. 561-570

    Research output: Contribution to journalArticleScientificpeer-review

  23. Published

    Effects of improper source coupling in frequency-domain near-infrared spectroscopy

    Noponen, T., Kotilahti, K., Nissila, I., Kajava, T. & Merilainen, P., 2010, In : Physics in Medicine and Biology. 55, 10, p. 2941-2960

    Research output: Contribution to journalArticleScientificpeer-review

  24. Published

    Hemodynamic responses to speech and music in newborn infants

    Kotilahti, K., Nissilä, I., Näsi, T., Lipiäinen, L., Noponen, T., Meriläinen, P., Huotilainen, M. & Fellman, V., 2010, In : Human Brain Mapping. 31, 4, p. 595-603

    Research output: Contribution to journalArticleScientificpeer-review

  25. 2009
  26. Published

    Approximation errors and model reduction in three-dimensional diffuse optical tomography

    Kolehmainen, V., Schweiger, M., Nissilä, I., Tarvainen, T., Arridge, S. R. & Kaipio, J. P., 2009, In : JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A: OPTICS IMAGE SCIENCE AND VISION. 26, 10, p. 2257-2268

    Research output: Contribution to journalArticleScientificpeer-review

  27. Published

    Combining near-infrared spectroscopy with electroencephalography and repetitive transcranial magnetic stimulation

    Näsi, T., Kotilahti, K., Mäki, H., Nissilä, I. & Meriläinen, P., 2009, European Conference on Biomedical Optics (ECBO), Munich, Germany, June 14, 2009. Cubeddu, R. & Hielscher, A. (eds.). Optical Society of America

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  28. Published

    High-density optical probe for functional studies of neonates

    Nissilä, I., Kotilahti, K., Mustaniemi, H., Lajunen, A., Heiskala, J. & Hiltunen, P., 2009, 446. WE-Heraeus-Seminar Optical Imaging of Brain Function, Bad Honnef, Germany, 7.-10. Dec. 2009.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  29. Published

    Probablistic atlas can improve reconstruction from optical imaging of the neonatal brain

    Heiskala, J., Pollari, M., Metsäranta, M., Grant, E. & Nissilä, I., 2009, In : Optics Express . 17, 17, p. 14977-14992

    Research output: Contribution to journalArticleScientificpeer-review

  30. Published

    Significance of background optical properties, time-resolved information and optode arrangement in diffuse optical imaging of term neonates

    Heiskala, J., Hiltunen, P. & Nissilä, I., 2009, In : Physics in Medicine and Biology. 54, 3, p. 535-554

    Research output: Contribution to journalArticleScientificpeer-review

  31. Published

    Study of neurovascular coupling in humans via simultaneous magnetoencephalography and diffuse optical imaging acquisition

    Ou, WM., Nissilä, I., Radhakrishnan, H., Boas, DA., Hämäläinen, M. S. & Franceschini, MA., 2009, In : NeuroImage. 46, 3, p. 624-632

    Research output: Contribution to journalArticleScientificpeer-review

  32. 2007
  33. Published

    Image reconstruction in optical tomography in the presence of coupling errors

    Schweiger, M., Nissilä, I., Boas, D. & Arridge, S., 2007, In : Applied Optics. 46, 14, p. 2743-2756

    Research output: Contribution to journalArticleScientificpeer-review

  34. Published

    Lateralisation in hemodynamic responses to speech and music stimuli measured with near-infrared spectroscopic imaging

    Kotilahti, K., Lipiäinen, L., Näsi, T., Nissilä, I., Noponen, T., Huotilainen, M., Meriläinen, P. & Fellman, V., 2007, 48th Annual Meeting of the European Society for paediatric research, Prague, Czech Republic, 6. - 8.10.2007.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  35. Published

    Significance of tissue anisotropy in optical tomography of the infant brain

    Heiskala, J., Neuvonen, T., Grant, P. E. & Nissilä, I., 2007, In : Applied Optics. 46, 10, p. 1633-1640

    Research output: Contribution to journalArticleScientificpeer-review

  36. 2006
  37. Published

    Comparison between a time-domain and a frequency-domain system for optical tomography

    Nissilä, I., Hebden, J. C., Jennions, D., Heino, J., Schweiger, M., Kotilahti, K., Noponen, T., Gibson, A., Järvenpää, S., Lipiäinen, L. & 1 othersKatila, T., 2006, In : Journal of Biomedical Optics. 11

    Research output: Contribution to journalArticleScientificpeer-review

  38. Published

    Evaluation of phase signals in quantitative near-infrared spectroscopy

    Noponen, T., Kajava, T., Nissilä, I., Kotilahti, K. & Meriläinen, P., 2006, Washington, DC, p. ME23, (OSA Biomedical Topical Meetings and Tabletop Exhibit, Optics in Neuroscience, Fort Lauderdale, Florida, USA, March 19-23, 2006.).

    Research output: Working paperProfessional

  39. Published

    Hemodynamic responses to continuous speech and music in the newborn brain

    Kotilahti, K., Huotilainen, M., Nissilä, I., Noponen, T. & Fellman, V., 2006, XVth Biennial International Conference on Infant Studies, Kyoto, Japan, 20.-22.6.2006.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  40. Published

    Near-infrared spectroscopic imaging

    Kotilahti, K., Kajava, T., Noponen, T., Heino, J., Nissilä, I. & Katila, T., 2006, Wiley Encyclopedia of Biomedical Engineering. Akay, M. (ed.). Hoboken, NJ, USA: John Wiley & Sons Inc.

    Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

  41. Published

    Newborn brain responds strongly to prosody in continuous speech

    Huotilainen, M., Sambeth, A., Kotilahti, K., Nissilä, I., Seppä, K., Alku, P. & Fellman, V., 2006, (XVth Biennial International Conference on Infant Studies, Kyoto, Japan, 20.-22.6.2006).

    Research output: Working paperProfessional

  42. 2005
  43. Published

    A compact near-infrared sperctroscopic imaging system for non-invasive brain studies

    Lipiäinen, L., Nissilä, I., Noponen, T., Kotilahti, K., Kajava, T., Meriläinen, P. & Katila, T., 2005, p. 252, (XXXIX Annual Conference of the Finnish Physical Society, Espoo, 17.-19.3.2005).

    Research output: Working paperProfessional

  44. Published

    Advances in Electromagnetic Fields in Living Systems, volume 4

    Nissilä, I., Noponen, T., Heino, J., Kajava, T. & Katila, T., 2005, USA.

    Research output: Book/ReportBookScientificpeer-review

  45. Published

    An application of perturbation Monte Carlo in optical tomography

    Heiskala, J., Kotilahti, K. & Nissilä, I., 2005, 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBS), Shanghai, 1.-4.9.2005. Zhang, Y. T., Xu, L. X., Roux, C., Zhuang, T. G., Tamura, T. & Galiana, H. L. (eds.). Piscataway, New Jersey, USA: IEEE Engineering in Medicine and Biology Society, p. elektroninen

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  46. Published

    Bilateral hemodynamic responses to auditory stimulation in newborn infants

    Kotilahti, K., Nissilä, I., Huotilainen, M., Mäkelä, R., Gavrielides, N., Noponen, T., Bjorkman, P., Fellman, V. & Katila, T., 2005, In : Neuroreport. 16, 12, p. 1373-1377

    Research output: Contribution to journalArticleScientificpeer-review

  47. Published

    Estimating arterial oxygen saturation of human brain with near-infrared spectroscopic imaging

    Näsi, T., Noponen, T., Lipiäinen, L., Kajava, T., Nissilä, I., Meriläinen, P. & Katila, T., 2005, Espoo, p. 253, (XXXIX Fysiikan päivät, 17.-19.3.2005 Espoo).

    Research output: Working paperProfessional

  48. Published

    Gauss-Newton method for image reconstruction in diffuse optical tomography

    Schweiger, M., Arridge, S. R. & Nissilä, I., 2005, In : Physics in Medicine and Biology. 50, p. 2365-2386

    Research output: Contribution to journalArticleScientificpeer-review

  49. Published

    Instrumentation and calibration methods for the multichannel measurement of phase and amplitude in optical tomography

    Nissilä, I., Noponen, T., Kotilahti, K., Katila, T., Lipiäinen, L., Tarvainen, T., Schweiger, M. & Arridge, S., 2005, In : Review of Scientific Instruments. 76, p. artikkeli no 044302

    Research output: Contribution to journalArticleScientificpeer-review

  50. Published

    Methods for bilateral haemodynamic activation studies of newborn infants

    Mäkelä, R., Nissilä, I., Huotilainen, M., Kotilahti, K., Gavrielides, N., Noponen, T., Kajava, T. & Katila, T., 2005, p. 24, (Symposium: Human Brain Development, 25.-26.5.2005, Helsinki).

    Research output: Working paperProfessional

  51. Published

    Modeling anisotropic light propagation in a realistic model of the human head

    Heiskala, J., Nissilä, I., Neuvonen, T., Järvenpää, S. & Somersalo, E., 2005, In : Applied Optics. 44, 11, p. 2049-2057

    Research output: Contribution to journalArticleScientificpeer-review

  52. Published

    Near-infrared spectroscopic imaging of stimulus-related hemodynamic responses on the neonatal auditory cortices

    Kotilahti, K., Nissilä, I., Mäkelä, R., Noponen, T., Lipiäinen, L., Gavrielides, N., Kajava, T., Huotilainen, M., Fellman, V., Meriläinen, P. & 1 othersKatila, T., 2005, SPIE Photonics West 2005, San Jose, USA 2005. Chance, B., Alfano, R. R., Tromberg, B. J., Tamura, M. & Sevick-Muraca, E. M. (eds.). p. 388-395

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  53. Published

    Perturbation Monte Carlo method in optical imaging

    Heiskala, J., Kotilahti, K. & Nissilä, I., 2005, p. 14, (Programme and abstract book / Symposium: Human Brain Development, May 25-26, 2005, Helsinki).

    Research output: Working paperProfessional

  54. Published

    Simultaneous diffuse near-infrared imaging of hemodynamic and oxygenation changes and electroencephalographic measurements of neuronal activity in the human brain

    Noponen, T., Kicic, D., Kotilahti, K., Kajava, T., Kähkönen, S., Nissilä, I., Meriläinen, P. & Katila, T., 2005, SPIE Photonics West 2005, San Jose, USA 2005. Chance Britton, A. R. R. & Tamura Mamoru, S-M. E. M. (eds.). p. 179-190

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  55. Published

    Studying brain activity noninvasively with a low-cost continuous-wave optical imaging instrument

    Lipiäinen, L., Nissilä, I., Noponen, T., Kotilahti, K., Kajava, T., Meriläinen, P. & Katila, T., 2005, p. 23, (Symposium Human Brain Development, 25.-26.5.2005, Helsinki).

    Research output: Working paperProfessional

  56. 2004
  57. Published

    A comparison between difference data measured with a time-domain and a frequency-domain system for optical tomography

    Nissilä, I., Hebden, J. C., Jennions, D., Heino, J., Schweiger, M., Kotilahti, K., Noponen, T., Gibson, A., Järvenpää, S., Lipiäinen, L. & 1 othersKatila, T., 2004, Espoo, p. 22, (Helsinki University of Technology Publications on; no. TKK-F-A834).

    Research output: Working paperProfessional

  58. Published

    Auditory hemodynamic studies of newborn infants using near-infrared spectroscopic imaging

    Nissilä, I., Kotilahti, K., Huotilainen, M., Mäkelä, R., Lipiäinen, L., Noponen, T., Gavrielides, N., Näätänen, R., Fellman, V. & Katila, T., 2004, p. 1244-1247, (The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Francisco, California, USA, 1.-5.9.2004).

    Research output: Working paperProfessional

  59. Published

    Instrumentation and calibration methods for the multichannel measurement of phase and amplitude in optical tomography

    Nissilä, I., Noponen, T., Kotilahti, K., Tarvainen, T., Schweiger, M., Lipiäinen, L., Arridge, S. & Katila, T., 2004, Espoo, p. 19, (Helsinki University of Technology Publications on Engineering Physics; no. TKK-F-A833).

    Research output: Working paperProfessional

  60. Published

    Monte Carlo simulation of light propagation in the human visual cortex

    Heiskala, J., Nissilä, I. & Somersalo, E., 2004, Miami Beach, Florida, USA, p. 3, (Optical Society of America Biomedical Topical Meeting 2004, Miami Beach, Florida, USA).

    Research output: Working paperProfessional

  61. Published

    Multi-channel near-infrared spectroscopy on the human forehead during hypo- and hypercapnia

    Noponen, T., Paloheimo, M., Meriläinen, P., Kajava, T., Kotilahti, K., Nissilä, I. & Katila, T., 2004, p. WF8, (OSA Biomedical Topical Meetings and Tabletop Exhibit, Biomedical Optical Spectroscopy and Diagnostics, Miami Beach, Florida, USA, 14.-17.4.2004).

    Research output: Working paperProfessional

  62. 2003
  63. Published

    A Monte Carlo method in optical tomography

    Heiskala, J., Nissilä, I. & Ilmoniemi, R., 2003, XXXVIII Annual Conference of the Finnish Physical Society, Helsinki, 20.-22.3.2003. Sundius, T., Edelmann, E. & Hyvönen-Dabek, M. (eds.). Helsinki

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  64. Published

    Diffuse optical brain imaging of full-term newborn infants

    Kotilahti, K., Nissilä, I., Huotilainen, M., Noponen, T., Katila, T. & Fellman, V., 2003, 44th Annual Meeting of the European Society for Paediatric Research, Bilbao, Spain, 27.-30.9.2003. p. 104

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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