Toru Yamamoto

Summary

Affiliation: Hokkaido University
Country: Japan

Publications

  1. ncbi request reprint Paradoxical correlation between signal in functional magnetic resonance imaging and deoxygenated haemoglobin content in capillaries: a new theoretical explanation
    Toru Yamamoto
    College of Medical Technology, Hokkaido University, Sapporo, Japan
    Phys Med Biol 47:1121-41. 2002
  2. ncbi request reprint A blood-oxygenation-dependent increase in blood viscosity due to a static magnetic field
    Toru Yamamoto
    Department of Health Sciences, Hokkaido University School of Medicine, N12 W5, Sapporo 060 0812, Japan
    Phys Med Biol 49:3267-77. 2004
  3. ncbi request reprint Elucidation of accuracy in calibration of MR signal intensity based on transmission amplitude method
    T Yamamoto
    Department of Radiological Technology, College of Medical Technology, Hokkaido University, Sapporo, Japan
    MAGMA 11:89-95. 2000
  4. ncbi request reprint The initial attachment of cemental fibrils to the root dentin surface in acellular and cellular cementogenesis in rat molars
    T Yamamoto
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
    Ann Anat 183:123-8. 2001
  5. ncbi request reprint The nature and function of mononuclear cells on the resorbed surfaces of bone in the reversal phase during remodeling
    T Domon
    Department of Oral Health Sciences, Hokkaido University Graduate School of Dentistry, Sapporo, Japan
    Ann Anat 183:103-10. 2001
  6. doi request reprint Stimulus frequency dependence of blood oxygenation level-dependent functional magnetic resonance imaging signals in the somatosensory cortex of rats
    Ikuhiro Kida
    Division of Oral Functional Science, Graduate School of Dental Medicine, Hokkaido University, Hokkaido, Japan
    Neurosci Res 62:25-31. 2008
  7. ncbi request reprint Early detection of subacute sclerosing panencephalitis by high b-value diffusion-weighted imaging: a case report
    Khin Khin Tha
    Department of Radiology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
    J Comput Assist Tomogr 30:126-30. 2006
  8. ncbi request reprint Immunolocation of proteoglycans and bone-related noncollagenous glycoproteins in developing acellular cementum of rat molars
    T Yamamoto
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita13 Nishi7 Kita Ku, Sapporo, 060 8586, Japan
    Cell Tissue Res 317:299-312. 2004
  9. ncbi request reprint Mitotic proliferation of myoepithelial cells during regeneration of atrophied rat submandibular glands after duct ligation
    S Takahashi
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
    J Oral Pathol Med 33:430-4. 2004
  10. doi request reprint Effect of pH on anisotropic gelation of DNA induced by aluminum cations
    K Furusawa
    Faculty of Advanced Life Science, Hokkaido University, Kita Ku Kita 10 Nishi 8, Sapporo 060 0810, Japan
    J Phys Chem B 114:13923-32. 2010

Collaborators

Detail Information

Publications35

  1. ncbi request reprint Paradoxical correlation between signal in functional magnetic resonance imaging and deoxygenated haemoglobin content in capillaries: a new theoretical explanation
    Toru Yamamoto
    College of Medical Technology, Hokkaido University, Sapporo, Japan
    Phys Med Biol 47:1121-41. 2002
    ..Our theory explains the paradoxical phenomena of the oxyHb and deoxyHb contributions to the MR signal and gives a new insight into the precise haemodynamics of activation by analysing fMRI and NIRS data...
  2. ncbi request reprint A blood-oxygenation-dependent increase in blood viscosity due to a static magnetic field
    Toru Yamamoto
    Department of Health Sciences, Hokkaido University School of Medicine, N12 W5, Sapporo 060 0812, Japan
    Phys Med Biol 49:3267-77. 2004
    ..Notably, the blood viscosity increased depending on blood oxygenation and the shear rate of the blood flow. Thus, our findings suggest that even a 1.5 T magnetic field may modulate blood flow...
  3. ncbi request reprint Elucidation of accuracy in calibration of MR signal intensity based on transmission amplitude method
    T Yamamoto
    Department of Radiological Technology, College of Medical Technology, Hokkaido University, Sapporo, Japan
    MAGMA 11:89-95. 2000
    ..The standard deviations of the calibrated values in the thalamus and frontal white matter were 2.9 and 3.8%, respectively. We suggest that the modified TRA method is a practical and reliable technique to obtain clinical numeric evidence...
  4. ncbi request reprint The initial attachment of cemental fibrils to the root dentin surface in acellular and cellular cementogenesis in rat molars
    T Yamamoto
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
    Ann Anat 183:123-8. 2001
    ..The present study suggests that an intervening adhesive is necessary for the cemento-dentinal attachment at any stage of cementogenesis in rat molars...
  5. ncbi request reprint The nature and function of mononuclear cells on the resorbed surfaces of bone in the reversal phase during remodeling
    T Domon
    Department of Oral Health Sciences, Hokkaido University Graduate School of Dentistry, Sapporo, Japan
    Ann Anat 183:103-10. 2001
    ....
  6. doi request reprint Stimulus frequency dependence of blood oxygenation level-dependent functional magnetic resonance imaging signals in the somatosensory cortex of rats
    Ikuhiro Kida
    Division of Oral Functional Science, Graduate School of Dental Medicine, Hokkaido University, Hokkaido, Japan
    Neurosci Res 62:25-31. 2008
    ..The discrepant results of most previous fMRI studies using gradient-echo sequence may be ascribed to the difference of imaging to enhance activation focus or draining vein...
  7. ncbi request reprint Early detection of subacute sclerosing panencephalitis by high b-value diffusion-weighted imaging: a case report
    Khin Khin Tha
    Department of Radiology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
    J Comput Assist Tomogr 30:126-30. 2006
    ..The signal abnormalities were difficult to identify on other magnetic resonance imaging sequences, including routine DWI. High b-value DWI could be valuable for earlier detection of subacute sclerosing panencephalitis...
  8. ncbi request reprint Immunolocation of proteoglycans and bone-related noncollagenous glycoproteins in developing acellular cementum of rat molars
    T Yamamoto
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita13 Nishi7 Kita Ku, Sapporo, 060 8586, Japan
    Cell Tissue Res 317:299-312. 2004
    ..Thus, initial acellular cementogenesis requires a dense accumulation of PGs, BSP, and OPN, which may be associated with the mineralization process independently of collagen fibrils and initial principal fiber attachment...
  9. ncbi request reprint Mitotic proliferation of myoepithelial cells during regeneration of atrophied rat submandibular glands after duct ligation
    S Takahashi
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
    J Oral Pathol Med 33:430-4. 2004
    ..The purpose of the present study was to elucidate whether myoepithelial cells proliferate mitotically during regeneration of rat submandibular glands after atrophy...
  10. doi request reprint Effect of pH on anisotropic gelation of DNA induced by aluminum cations
    K Furusawa
    Faculty of Advanced Life Science, Hokkaido University, Kita Ku Kita 10 Nishi 8, Sapporo 060 0810, Japan
    J Phys Chem B 114:13923-32. 2010
    ..Both two-stage dynamics observed under high initial pH and one-stage dynamics under low initial pH were explained consistently with the theories...
  11. ncbi request reprint Immunohistochemical characterization of noncollagenous matrix molecules on the alveolar bone surface at the initial principal fiber attachment in rat molars
    A K S Arambawatta
    Department of Oral Health Science, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita ku, Sapporo 060 8586, Japan
    Ann Anat 187:77-87. 2005
    ..The BSP and OPN act to maintain the interface integrity between Sharpey's fiber-containing and Sharpey's fiber-lacking alveolar bone after the PF attachment is established...
  12. ncbi request reprint Active participation of apoptosis and mitosis in sublingual gland regeneration of the rat following release from duct ligation
    S Takahashi
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo 060 8586, Japan
    J Mol Histol 36:199-205. 2005
    ..These observations suggest that apoptosis as well as mitosis of duct and acinar cells actively participate in and play important roles in sublingual gland regeneration...
  13. ncbi request reprint Determination of two different types of cellular cementogenesis in rat molars: a histological and immunohistochemical study
    T Yamamoto
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita13 Nishi7 Kita Ku, Sapporo 060 8586, Japan
    Matrix Biol 24:295-305. 2005
    ..3) The formation of the initial cementum depends on the speed of the cementogenesis in the apical direction...
  14. ncbi request reprint Biological behavior of myoepithelial cells in the regeneration of rat atrophied sublingual glands following release from duct ligation
    S Takahashi
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, 060 8586, Japan
    J Mol Histol 36:373-9. 2005
    ....
  15. ncbi request reprint An immunohistochemical study of the attachment mechanisms in different kinds of adhesive interfaces in teeth and alveolar bone of the rat
    A K S Arambawatta
    Department of Oral Health Science, Hokkaido University, Graduate School of Dental Medicine, Sapporo, Japan
    J Periodontal Res 41:259-65. 2006
    ....
  16. ncbi request reprint Cell death and cell proliferation in the regeneration of atrophied rat submandibular glands after duct ligation
    S Takahashi
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo
    J Oral Pathol Med 33:23-9. 2004
    ..The present study aimed to clarify the proliferation and apoptosis of parenchymal cells during regeneration of rat submandibular glands following atrophy...
  17. ncbi request reprint A light microscopic study of the attachment mechanism in different kinds of adhesive lines in rat molars
    M D Islam
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
    Ann Anat 183:319-23. 2001
    ..In conclusion, this study suggests that there is one attachment mechanism for the different kinds of collagen based hard tissue in the rat molar region...
  18. ncbi request reprint Early structural changes in myosin rod upon heating of carp myofibrils
    K Konno
    Laboratory of Food Biochemistry, Faculty of Fisheries, Hokkaido University, Hakodate, Hokkaido 041 8611 Japan
    J Agric Food Chem 48:4905-9. 2000
    ..It was, therefore, concluded that the fastest event occurring in the myosin molecule upon heating of myofibrils is the irreversible exposure of the HMM/LMM junction...
  19. ncbi request reprint The fibrillar structure of the cemento-dentinal junction in different kinds of human teeth
    T Yamamoto
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
    J Periodontal Res 36:317-21. 2001
    ..The present study suggests that this applies to other kinds of human teeth...
  20. ncbi request reprint Apoptosis and proliferation of myoepithelial cells in atrophic rat submandibular glands
    S Takahashi
    Department of Oral Health Sciences, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
    J Histochem Cytochem 49:1557-64. 2001
    ..Apoptotic myoepithelial cells were also identified by TEM. These observations suggest that both apoptosis and proliferation of myoepithelial cells occur, especially in the early phase of atrophy, in the rat submandibular gland...
  21. ncbi request reprint The roles of apoptosis and mitosis in atrophy of the rat sublingual gland
    S Takahashi
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
    Tissue Cell 34:297-304. 2002
    ..In addition, it appears that the transition from acinar to duct cell and the necrosis of acinar cells play important roles in the atrophy of the sublingual gland...
  22. ncbi request reprint Three-dimensional distribution of the clear zone of migrating osteoclasts on dentin slices in vitro
    T Domon
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita ku, Sapporo 060 8586, Japan
    Tissue Cell 34:326-36. 2002
    ....
  23. ncbi request reprint Twisted plywood structure of an alternating lamellar pattern in cellular cementum of human teeth
    T Yamamoto
    Department of Oral Anatomy II, Hokkaido University School of Dentistry, Sapporo, Japan
    Anat Embryol (Berl) 202:25-30. 2000
    ..Our results suggest that polishing and etching procedures cause damage to fibrils and fibril arrangement...
  24. ncbi request reprint Proliferation and distribution of myoepithelial cells during atrophy of the rat sublingual gland
    S Takahashi
    Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo
    J Oral Pathol Med 32:90-4. 2003
    ..The present study was aimed to determine the proliferation and distribution of myoepithelial cells during atrophy of rat sublingual glands...
  25. ncbi request reprint Apoptosis and mitosis of parenchymal cells in the duct-ligated rat submandibular gland
    S Takahashi
    Department of Oral Health Sciences, Hokkaido University Graduate School of Dentistry, Kita 13, Nishi 7, Kita ku, Sapporo, 060 0813, Japan
    Tissue Cell 32:457-63. 2000
    ..Submandibular gland duct ligation thus induced marked depletion of acinar cell by apoptosis and a concurrent short-lived cycle of duct cell proliferation...
  26. ncbi request reprint Early detection of global cerebral anoxia: improved accuracy by high-b-value diffusion-weighted imaging with long echo time
    Khin K Tha
    Department of Radiology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
    AJNR Am J Neuroradiol 26:1487-97. 2005
    ..We evaluated whether accuracy in early detection of global cerebral anoxia was improved by high-b-value diffusion-weighted imaging (DWI) with long echo time (TE)...
  27. ncbi request reprint [MRS for diagnosis of brain tumors]
    Toru Yamamoto
    Division of Medical Engineering and Science, Department of Health Sciences, Hokkaido University School of Medicine
    Nihon Rinsho 63:222-7. 2005
  28. ncbi request reprint Observation of changes in neural activity due to the static magnetic field of an MRI scanner
    Atsuhito Toyomaki
    Department of Psychiatry, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
    J Magn Reson Imaging 26:1216-21. 2007
    ..To clarify whether a strong static magnetic field affects brain activity such as arousal level...
  29. ncbi request reprint New tissue substitutes representing cortical bone and adipose tissue in quantitative radiology
    S Sanada
    Department of Radiological Technology, School of Health Sciences, Kanazawa University, Japan
    Phys Med Biol 44:N107-12. 1999
    ..Also, the use of methyl alcohol for adipose tissue was more suitable than ethyl alcohol as a phantom material because of its physical and chemical properties...
  30. doi request reprint Prebiotic properties of epilactose
    J Watanabe
    Creative Research Initiative Sousei, Hokkaido University, Sapporo 001 0021, Japan
    J Dairy Sci 91:4518-26. 2008
    ..Cellobiose 2-epimerase may increase the value of dairy products by changing lactose to epilactose possessing prebiotic properties...
  31. ncbi request reprint Comparison between 3-D and z-axis automatic tube current modulation technique in multidetector-row CT
    K Matsubara
    Department of Radiological Technology, Kanazawa University Hospital, 13 1 Takaramachi, Kanazawa, Ishikawa, Japan
    Radiat Prot Dosimetry 128:106-11. 2008
    ..Therefore, the 3-D ATCM technique effectively optimises the radiation dose, while maintaining an appropriate image quality compared with z-axis ATCM technique...
  32. ncbi request reprint Biochemical studies of two rat acyl-CoA synthetases, ACS1 and ACS2
    H Iijima
    Tohoku University Gene Research Center, Japan, Sendai, Japan
    Eur J Biochem 242:186-90. 1996
    ..Introduction of these mutants into E. coli revealed that all five regions in ACS1 are required for functional expression of the enzyme in E. coli; deletion of any one of the five regions almost completely abolished the enzyme activity...
  33. doi request reprint Direct comparison of histology of microbleeds with postmortem MR images: a case report
    Shinsui Tatsumi
    Department of Neurology, Osaka Saiseikai Nakatsu Hospital, Osaka, Japan
    Cerebrovasc Dis 26:142-6. 2008
    ..Although the clinical significance of so-called microbleeds (MBs) in gradient-echo MR images (GRE-MRI) has been extensively researched, the histopathological evaluation is notably insufficient...
  34. ncbi request reprint [Vacuolar myelopathy with symmetrical involvement of the fasciculus cuneatus, in a case of amyotrophic lateral sclerosis with multisystemic degeneration]
    Mariko Yamashita
    Department of Neurology, Osaka Saiseikai Nakatsu Hospital, 2 10 39 Shibata, Kita ku, Osaka 530 0012, Japan
    No To Shinkei 54:685-91. 2002
    ..Although the etiology of vacuolar myelopathy is unknown, the selective distribution of vacuolar change as seen in our patient has never been described in the past literature of vacuolar myelopathy associated with various diseases...
  35. ncbi request reprint [An autopsy case of encephalopathy associated with small cell carcinoma of the stomach with nonconvulsive status epilepticus resembling Creutzfeldt-Jakob disease]
    Yuko Wada
    Department of Neurology, Osaka Saiseikai Nakatsu Hosipital, Japan
    No To Shinkei 55:423-8. 2003
    ..This case was unique in the prolonged CJD-like manifestations, which turned out to be due to NCSE. Despite anti-neuronal antibodies were not detected, we suspect yet another paraneoplastic brain syndrome in this patient...