1. Articles from masamitsu haruna

    1-13 of 13
    1. Dynamic imaging of a small artery underneath skin surface of a human finger by optical coherence tomography

      Dynamic imaging of a small artery underneath skin surface of a human finger by optical coherence tomography

      OCT is a powerful tool for detection of physiological functions of micro organs underneath the human skin surface, besides the clinical application to ophthalmology, as recently demonstrated by the authors’ group. In particular, dynamics of peripheral vessels can be observed clearly in the time-sequential OCT images. Among the vascular system, only the small artery has two physiological functions both for the elastic artery and for muscle-controlled one. It, therefore, is important for dynamic analysis of blood flow and circulation. In the time-sequential OCT images obtained with 25 frames/sec, it is found that the small artery makes a sharp ...

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      Mentions: Osaka University
    2. Dynamic analysis for mental sweating of a group of eccrin sweat glands on a human fingertip by optical coherence tomography

      Dynamic analysis for mental sweating of a group of eccrin sweat glands on a human fingertip by optical coherence tomography
      OCT is highly potential for in vivo observation of human sweating dynamics which affects activity of the sympathetic nerve. In this paper, we demonstrate dynamic OCT analysis of mental sweating of a group of eccrin sweat glands. The sweating dynamics is tracked simultaneously for nineteen sweat glands by time-sequential piled-up en-face OCT images with the frame spacing of 3.3 sec. Strong non-uniformity is observed in mental sweating where the amount of excess sweat is different for each sweat gland although the sweat glands are adjacent to each other. The non-uniformity should be necessary to adjust as precisely the total ...
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      Mentions: Osaka University
    3. Dynamic analysis of a small artery of a human finger by optical coherence tomography

      Dynamic analysis of a small artery of a human finger by optical coherence tomography

      OCT is highly potential for development of a new field of dynamic skin physiology, as recently reported by the authors. In this paper, we demonstrate dynamic analysis of a small artery of a human finger by the SS-OCT. Among the vascular system, only the small artery has two physiological functions both for the elastic artery (like main and middle arteries) and for muscle-controlled one (like arterioles). It, therefore, is important for dynamic analysis of blood flow and circulation. In the time-sequential OCT images obtained with 25 frames/s, it is found that the small artery makes a sharp response to ...

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      Mentions: Osaka University
    4. Real-time OCT imaging of laser ablation of biological tissue

      Real-time OCT imaging of laser ablation of biological tissue
      During laser ablation of a diseased area, the surrounding tissues and organs suffer serious damage. In order to optimize laser ablation of biological tissues, it is necessary to observe the laser ablation in situ. The real-time imaging of tissue laser ablation is realized in the fusion system of the YAG ablation laser and optical coherence tomography (OCT). A swept-source OCT (SS-OCT) is combined with a YAG-laser ablation system. In this paper, we demonstrate real-time OCT imaging of tissue laser ablation. The fiber-optic swept source OCT (SS-OCT) with 25 frames / s is used for the in situ observation where tissue laser ...
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      Mentions: Osaka University
    5. Dynamic analysis of mental sweating by optical coherence tomography

      Dynamic analysis of mental sweating by optical coherence tomography
      In the dynamic OCT of mental sweating, we have found internal mental sweating without ejection of excess sweat from the spiral lumen to the skin surface. Internal sweating occurs more often in the case where mental stress is applied to a volunteer, and it is more useful for evaluation of activity of the sympathetic nerve. Furthermore, the MIP imaging has been proposed for quick 3-D imaging of the spiral lumen of sweat glands. Using time-sequential MIP images with the frame spacing as short as 1.4 sec, several sweat glands can be tracked simultaneously to quantify sweating stimulated by a ...
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      Mentions: Osaka University
    6. Progress of OCT and its applications

      Optical coherence tomography (OCT) is the cross-sectional imaging of biological tissue based on the low-coherence interferometry, where the image resolution is around 10 m with the imaging depth of 1 to 2 mm. Since its first demonstration, OCT has been developed intensively for clinical diagnoses of ophthalmology and arteriosclerosis. Beside the clinical applications, OCT is used for analysis of physiological functions underneath the human skin surface. Recently, we proposed and demonstrated the dynamic OCT for in vivo observation of physiological functions of small organs underneath the skin surface. In the dynamic OCT, tomographic images are obtained time-sequentially for tracking of ...
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      Mentions: Osaka University
    7. Maximum intensity projection imaging for dynamic analysis of mental sweating by optical coherence tomography

      A novel 3-D image construction method with maximum intensity projection (MIP) of B-mode OCT images is proposed for in vivo dynamic analysis of mental sweating on human fingertips. Time-sequential MIP-OCT images with the frame spacing as short as 1.4 sec provide us quantitative analysis of the sweati ... [Proc. SPIE 7168, 71682D (2009)] published Fri Feb 20, 2009.
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      Mentions: Osaka University
    8. Dynamic analysis of laser ablation of biological tissue using a real-time OCT

      In laser ablation of biological tissues, tomography of the tissue surface is necessary for measurement of the crater depth and observation of the thermal damage of the tissue. Optical coherence tomography (OCT) is a very promising candidate for an in-situ observation of the tissue. We demonstrate here dynamic analysis of tissue laser ablation using a real-time OCT.
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      Mentions: Osaka University
    9. Dynamic analysis of internal and external mental sweating by optical coherence tomography

      Mental sweating is human sweating that is accelerated via the sympathetic nerve by application of mental or physical stress. In the neurosciences, there is keen interest in this type of sweating, because the amount of sweat in response to a stress applied to a volunteer directly reflects activity of the sympathetic nerve. It is therefore of particular value that optical coherence tomography (OCT) can provide clear in vivo imaging of the spiral lumen of an eccrin sweat gland in the epidermis with a spatial resolution around 10 µm. We demonstrate dynamic OCT of mental sweating of an eccrin sweat gland ...
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      Mentions: Osaka University
    10. Maximum-Intensity-Projection Imaging for Dynamic Analysis of Mental Sweating by Optical Coherence Tomography

      Authors: Hiroyuki Saigusa, Yoshihiro Ueda, Akihiro Yamada, Masato Ohmi, Makoto Ohnishi, Mitsuo Kuwabara, and Masamitsu HarunaOptical coherence tomography (OCT) shows great potential for microscopic observation of human sweating dynamics. It should be a key technology in the development of new techniques for the study of dynamic physiology. In this study, the dynamic motion of eccrin sweat glands is visualized by three-dimensional (3-D) OCT imaging, and a novel 3-D image construction method, using maximum intensity projection (MIP) of B-mode OCT images, is proposed for in vivo dynamic analysis of mental sweating on human fingertips. Time-sequential MIP-OCT images with a frame spacing ...
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      Mentions: Osaka University
    11. Maximum-intensity-projection images for dynamic analysis of mental sweating by optical coherence tomography

      Hiroyuki Saigusa, Yoshihiro Ueda, Akihiro Yamada et al. We demonstrate a novel 3-D image construction method with maximum intensity projection (MIP) of B-mode images obtained by the swept-source OCT. The time-sequential MIP images with a frame spacing of only 0.7 sec are obtained to make dynamic analysis of mental sweating on human fingertips. ... [Proc. SPIE 7004, 70040V (2008)] published Fri May 16, 2008.
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      Mentions: Osaka University
    12. Method and apparatus for simultaneously interferometrically measuring optical characteristics in a noncontact manner

      Light from a light source is converged by a converging lens and is irradiated to an object to be measured through a converging lens, the object to be measured or the converging lens and the reference light mirror are displaced so as to maximize intensities of interference light at the reference light mirror and the front and rear surfaces of the object to be measured, and displaced distances of the object to be measured or the converging lens and the reference light mirror at a position where an intensity of interference light becomes maximum at the rear surface and a ...
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    1-13 of 13
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    Dynamic analysis of mental sweating by optical coherence tomography Real-time OCT imaging of laser ablation of biological tissue Dynamic analysis for mental sweating of a group of eccrin sweat glands on a human fingertip by optical coherence tomography Intravitreal Ranibizumab Monotherapy or Combined with Laser for Diabetic Macular Edema (OCT guided study) Prospective evaluation of drug eluting self‐apposing stent for the treatment of unprotected left main coronary artery disease: 1‐year results of the TRUNC study Clinical validation of the RTVue optical coherence tomography angiography image quality indicators Intraoperative OCT-Assisted Retinal Detachment Repair in the DISCOVER Study: Impact and Outcomes Analysis of Retinal Vascular Density using Optical Coherence Tomography Angiography, to Differentiate Healthy, Glaucoma Suspect and Glaucomatous Eyes (Thesis) Correlation between in vivo near-infrared spectroscopy and optical coherence tomography detected lipid-rich plaques with post-mortem histology Simultaneous morphological and flow imaging enabled by megahertz intravascular Doppler optical coherence tomography Ultrastructural analysis of a corneal dellen using optical coherence tomography Optical coherence tomography through a rigid borescope applied to quantification of articular cartilage thickness in a porcine knee model