Tomoyuki Hasegawa

Summary

Affiliation: Kitasato University
Country: Japan

Publications

  1. doi request reprint Microfocus X-ray imaging of the internal geometry of brachytherapy seeds
    Tomoyuki Hasegawa
    School of Allied Health Sciences, Kitasato University, Kitasato 1 15 1, Minami Ku, Sagamihara, Kanagawa 252 0373, Japan Graduate School of Medical Sciences, Kitasato University, Kitasato 1 15 1, Minami Ku, Sagamihara, Kanagawa 252 0373, Japan Electronic address
    Appl Radiat Isot 86:13-20. 2014
  2. doi request reprint Validation of novel calibration scheme with traceable point-like (22)Na sources on six types of PET scanners
    Tomoyuki Hasegawa
    Allied Health Sciences, Kitasato University, Kitasato 1 15 1, Minami Ku, Sagamihara, Kanagawa, 252 0373, Japan
    Ann Nucl Med 27:346-54. 2013
  3. doi request reprint Microfocus x-ray imaging of traceable pointlike (22)Na sources for quality control
    T Hasegawa
    Allied Health Sciences, Kitasato University, Kanagawa, Japan
    Med Phys 39:4414-22. 2012
  4. doi request reprint Semi-quantitative and simulation analyses of effects of γ rays on determination of calibration factors of PET scanners with point-like (22)Na sources
    Tomoyuki Hasegawa
    School of Allied Health Sciences, Kitasato University, 1 15 1, Kitasato, Minamiku, Sagamihara, Kanagawa, 252 0373, Japan
    Phys Med Biol 56:6031-45. 2011
  5. doi request reprint Creation and application of three-dimensional computer-graphic animations for introduction to radiological physics and technology
    Tomoyuki Hasegawa
    Graduate School of Medical Science, Kitasato University, Sagamihara, Kanagawa, Japan
    Radiol Phys Technol 3:1-9. 2010
  6. doi request reprint A practical method of determining cross-calibration factors of PET scanners by moving a point-like (22)Na radioactive source
    Tomoyuki Hasegawa
    School of Allied Health Sciences, Kitasato University, 1 15 1 Kitasato, Sagamihara, Kanagawa, Japan
    Ann Nucl Med 24:655-61. 2010
  7. doi request reprint Point-like radioactive source with multiple absorber capsules for evaluating PET scanners
    Tomoyuki Hasegawa
    School of Allied Health Sciences, Kitasato University, 1 15 1 Kitasato, Sagamihara, Kanagawa, 228 8555, Japan
    Ann Nucl Med 24:427-32. 2010
  8. ncbi request reprint Optical observation of energy loss distribution and practical range of positrons from a 18F water solution in a water-equivalent phantom
    Tomoyuki Hasegawa
    Allied Health Sciences, Kitasato University, Kitasato 1 15 1, Sagamihara, Kanagawa 228 8555, Japan
    Med Phys 36:402-10. 2009
  9. ncbi request reprint Evaluation of static physics performance of the jPET-D4 by Monte Carlo simulations
    Tomoyuki Hasegawa
    Allied Health Sciences, Kitasato University, Kitasato 1 15 1, Sagamihara, Kanagawa, 228 8555, Japan
    Phys Med Biol 52:213-30. 2007
  10. ncbi request reprint On-clock non-paralyzable count-loss model
    Tomoyuki Hasegawa
    Allied Health Sciences, Kitasato University, Sagamihara shi, Kanagawa Ken, 228 8555, Japan
    Phys Med Biol 49:547-55. 2004

Collaborators

Detail Information

Publications13

  1. doi request reprint Microfocus X-ray imaging of the internal geometry of brachytherapy seeds
    Tomoyuki Hasegawa
    School of Allied Health Sciences, Kitasato University, Kitasato 1 15 1, Minami Ku, Sagamihara, Kanagawa 252 0373, Japan Graduate School of Medical Sciences, Kitasato University, Kitasato 1 15 1, Minami Ku, Sagamihara, Kanagawa 252 0373, Japan Electronic address
    Appl Radiat Isot 86:13-20. 2014
    ..Obtained high precision images enabled us to observe the internal structure of seeds qualitatively. Geometrical size parameters were evaluated quantitatively with uncertainty of 0.01-0.04mm (k=2). ..
  2. doi request reprint Validation of novel calibration scheme with traceable point-like (22)Na sources on six types of PET scanners
    Tomoyuki Hasegawa
    Allied Health Sciences, Kitasato University, Kitasato 1 15 1, Minami Ku, Sagamihara, Kanagawa, 252 0373, Japan
    Ann Nucl Med 27:346-54. 2013
    ..275-MeV γ rays accompanying β (+) decays. The purpose of this study is to validate this new calibration scheme with traceable point-like (22)Na sources on various types of PET scanners...
  3. doi request reprint Microfocus x-ray imaging of traceable pointlike (22)Na sources for quality control
    T Hasegawa
    Allied Health Sciences, Kitasato University, Kanagawa, Japan
    Med Phys 39:4414-22. 2012
    ....
  4. doi request reprint Semi-quantitative and simulation analyses of effects of γ rays on determination of calibration factors of PET scanners with point-like (22)Na sources
    Tomoyuki Hasegawa
    School of Allied Health Sciences, Kitasato University, 1 15 1, Kitasato, Minamiku, Sagamihara, Kanagawa, 252 0373, Japan
    Phys Med Biol 56:6031-45. 2011
    ..This study thus offers an important theoretical basis for the validity of the calibration method using point-like (22)Na radioactive sources...
  5. doi request reprint Creation and application of three-dimensional computer-graphic animations for introduction to radiological physics and technology
    Tomoyuki Hasegawa
    Graduate School of Medical Science, Kitasato University, Sagamihara, Kanagawa, Japan
    Radiol Phys Technol 3:1-9. 2010
    ..Opinion surveys conducted in undergraduate courses at Kitasato University support the effectiveness of our educational tools in helping students gain a better understanding of the subjects offered and in raising their interest...
  6. doi request reprint A practical method of determining cross-calibration factors of PET scanners by moving a point-like (22)Na radioactive source
    Tomoyuki Hasegawa
    School of Allied Health Sciences, Kitasato University, 1 15 1 Kitasato, Sagamihara, Kanagawa, Japan
    Ann Nucl Med 24:655-61. 2010
    ..This paper describes a new practical method that uses a point-like (22)Na radioactive source for determining CCFs...
  7. doi request reprint Point-like radioactive source with multiple absorber capsules for evaluating PET scanners
    Tomoyuki Hasegawa
    School of Allied Health Sciences, Kitasato University, 1 15 1 Kitasato, Sagamihara, Kanagawa, 228 8555, Japan
    Ann Nucl Med 24:427-32. 2010
    ..The aim of this study is to propose a point-like radioactive source with multiple absorber capsules, for which evaluation can be independent of scatter and attenuation owing to the source absorbers...
  8. ncbi request reprint Optical observation of energy loss distribution and practical range of positrons from a 18F water solution in a water-equivalent phantom
    Tomoyuki Hasegawa
    Allied Health Sciences, Kitasato University, Kitasato 1 15 1, Sagamihara, Kanagawa 228 8555, Japan
    Med Phys 36:402-10. 2009
    ....
  9. ncbi request reprint Evaluation of static physics performance of the jPET-D4 by Monte Carlo simulations
    Tomoyuki Hasegawa
    Allied Health Sciences, Kitasato University, Kitasato 1 15 1, Sagamihara, Kanagawa, 228 8555, Japan
    Phys Med Biol 52:213-30. 2007
    ..The results we describe here are essential to take full advantage of the next generation PET systems that have DOI recognition capability...
  10. ncbi request reprint On-clock non-paralyzable count-loss model
    Tomoyuki Hasegawa
    Allied Health Sciences, Kitasato University, Sagamihara shi, Kanagawa Ken, 228 8555, Japan
    Phys Med Biol 49:547-55. 2004
    ..This model was found to be a better fit to a data-acquisition system for a positron emission tomography scanner...
  11. ncbi request reprint Shielding effects of body - shields for 3D PET
    Tomoyuki Hasegawa
    Kitasato University, Allied Health Sciences
    Igaku Butsuri 22:318-26. 2002
    ..The body-shield should be carefully designed to minimize the gap between the body-shield and radioactive distribution as much as possible to maximize the shielding effects, and to be applicable to clinical diagnoses...
  12. ncbi request reprint [Correction of respiratory movement using ultrasound for cardiac nuclear medicine examinations: fundamental study using an X-ray TV machine]
    Kazushige Yoda
    Radiological Technology Course, Department of Medical Engineering and Technology, School of Allied Health Sciences, Kitasato University
    Nihon Hoshasen Gijutsu Gakkai Zasshi 59:1399-406. 2003
    ..As a result, respiratory movements of about 20.1 mm were successfully reduced to less than 2.6 mm. We conclude that this correction technique is potentially useful in nuclear medicine cardiology...
  13. ncbi request reprint Transaxial system models for jPET-D4 image reconstruction
    Taiga Yamaya
    National Institute of Radiological Sciences, 4 9 1 Anagawa, Inage Ku, Chiba 263 8555, Japan
    Phys Med Biol 50:5339-55. 2005
    ..A 3D image reconstruction with the on-the-fly calculation of the system matrix is within the practical limitations by incorporating the proposed model and the DOIC method with one-pass accelerated iterative methods...