Takashi Obi

1994 Research Associate, School of Engineering, Tokyo Inst. of Tech.
1997 Assistant Professor, Graduate School of Engineering, Tokyo Inst. of Tech.
2003 Associate Professor, Interdisciplinary Graduate School of Science and Engineering, Tokyo Inst. of Tech.
2012 Associate Professor, Imaging Science and Engineering Lab., Tokyo Inst. of Tech.
2016- Associate Professor, Institute of Innovative Research, Tokyo Inst. of Tech.

Field of Specialization
Social information systems, Medical information systems, Medical imaging, Information security

Laboratory for Future Interdisciplinary Research in Science and Technology / Advanced Research Center for Social Information Science and Engineering(IIR, Tokyo Tech)


Research Hub Group:Information and Artificial Intelligence Research International Hub Group

Research Highlights

  • Developed a smartcard authentication technology (Patent No. 5300026) and put it into practical use for the Public Certification Service for Individuals with my number card. 


  • June 2016
    “Introductory Interview: Expansion of utilization of the Public Certification Service for Individuals considering introduction cost is key to institutionalization” was published in My Number Magazine Monthly Local Government Solution, June, 2016 (in Japanese).
  • October 2015
    Our research implemented in My number Card was introduced in ” ‘Authentication only by holding up’, Know the technical specification of the My Number Card”, Nikkei Computer. Oct. 20, 2015,.

Selected Awards

  • 1999
    Japan Medical Imaging Technology Incentive Award
  • 2005
    Medical Imaging Technology Paper Award

Selected Publications

  • Isnaini Ismet, Takashi Obi, et.al., Monte Carlo simulation of efficient data acquisition for an entire-body PET scanner, Nuclear Instruments and Methods in Physics Research, Elsevier, Vol. 751, pp. 36–40, Jul. 2014.
  • Tatsuya Kon, Takashi Obi, et.al., Validation of a Fast Block-Iterative Spatio-temporal Reconstruction Algorithm for Small Animal Dynamic PET Data, Advanced Biomedical Engineering, Vol. 3, pp. 7-13, Apr. 2014.
  • Yunsang Oh, Hyoungshick Kim, Takashi Obi. Privacy-Enhancing Queries in Personalized Search with Untrusted Service Providers, IEICE Transactions on Information and Systems, Vol. E95-D, No. 1, pp. 143-151, Jan. 2012