Fumio Okuyama

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A theoretical framework for the electron field emission from carbon nanotubes (CNTs) is discussed. Using the tunneling theory, the influence of the detailed electron energy dispersion is proven to be of little importance for the electron field emission. By means of numerical computations in a simplified model, the influence of the environment on the local(More)
Purpose: To determine whether the temporal frequency characteristics of the visual system as determined by visually evoked potentials (VEP) can be used for a preoperative estimation of the visual function in eyes with cataracts. Methods: Light stimuli driven by a pseudorandom binary sequence (PRBS) of 40950 ms duration were presented and EEG recordings were(More)
Thermionic emission (TE)-type X-ray generators have been exclusively used in medicine, but there are many difficulties in making these X-ray sources compact. A field emission (FE)-type X-ray generator using carbon nanotubes is a newly-developed compact system that can be as small as several cm in length. Considering the compactness of the equipment, the(More)
An electron gun constructed using carbon-nanofiber (CNF) emitters and an electrostatic Einzel lens system has been characterized for the development of a high-resolution x-ray source. The CNFs used were grown on tungsten and palladium tips by plasma-enhanced chemical-vapor deposition. Electron beams with the energies of 10<E<20 keV were focused by the(More)
Informed consent for patients becomes important clinics where the doctor explains diseases and treatments. But patients have difficulty understanding medical images, i.e. X-rays, CT or MRI because the patient is not expert in reading these medical images. In this paper, we tried to reconstruct the stereoscopic image of CT and MRI and display these using a(More)
d m L E T c t m c T R t i m m e s t a t e c a 1 t C u i b i r w u [ m f b g Auto A G 1577 K y In the field of retina and i diagnosis of measurement Limiting Me Epithelium (R Tomography (conventional techniques and most cases of n cannot be app This paper pro RPE using two-dimension images to imp method, retina morphologica extract RPE structure of th the(More)
In patients with chest disease or after thoracic surgery, the body hair on diseased or operated side was often richer, but rarely poorer, in relation with the other side. Such a asymmetrical hair growth was termed hemitrichosis. The hemitrichosis could be experimentally produced on dogs by unilateral excision of skin strip of the back followed by the suture(More)
Optical Coherence Tomography (OCT) image is very useful to the diagnosis and the follow up evaluation of the response to treatment using either medication or surgery, and it is an emerging medical imaging technology for performing high resolution cross-sectional images. In ophthalmology, this technology can provide 3D images of retinal architecture, and it(More)