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Fluctuating Wind Pressures on High Aspect Ratio Circular Cylinder
Keisuke Miura,Masahiro Matsui Council on Tall Building and Urban Habitat Korea 2022 International journal of high-rise buildings Vol.11 No.4
In this study, The POD technique was applied to the fluctuating wind pressure of high aspect ratio circular cylinder to consider about its organizational structure, and considered about the characteristics of the fluctuating wind force obtained by synthesized the POD modes.
Chihiro Iwashita,Yoshimasa Miura,Hiroyuki Osawa,Takahito Takezawa,Yuji Ino,Masahiro Okada,Alan K. Lefor,Hironori Yamamoto 대한소화기내시경학회 2017 Clinical Endoscopy Vol.50 No.1
Barrett’s adenocarcinoma may occur in multiple sites, and recurrence and metachronous lesions are the major problems with endoscopic resection. Therefore, early detection of such lesions is ideal to achieve complete resection and obtain improved survival rates with minimally invasive treatment. Laser imaging systems allow multiple modalities of endoscopic imaging by using white light laser, flexible spectral imaging color enhancement (FICE), blue laser imaging (BLI), and linked color imaging even at a distant view. However, the usefulness of these modalities has not been sufficiently reported regarding Barrett’s adenocarcinoma. Here, we report on a patient with three synchronous lesions followed by one metachronous lesion in a long segment with changes of Barrett’s esophagus, all diagnosed with this new laser endoscopic imaging system and enhanced by using FICE and/or BLI with high contrast compared with the surrounding mucosa. Laser endoscopic imaging may facilitate the detection of malignancies in patients with early Barrett’s adenocarcinoma.
Blue Laser Imaging with a Small-Caliber Endoscope Facilitates Detection of Early Gastric Cancer
Haruo Takahashi,Yoshimasa Miura,Hiroyuki Osawa,Takahito Takezawa,Yuji Ino,Masahiro Okada,Alan Kawarai Lefor,Hironori Yamamoto 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.3
Conventional endoscopy often misses early gastric cancers with minimal red discoloration because they cannot be distinguished frominflamed mucosa. We treated a patient with a small early gastric cancer that was diffcult to diagnose using conventional endoscopy. Conventional endoscopy using a small-caliber endoscope showed only subtle red discoloration of the gastric mucosa. However, bluelaser imaging showed a clearly discolored area measuring 10 mm in diameter around the red lesion, which was distinct from thesurrounding inflamed mucosa. Irregular vessels on the tumor surface (suspicious for early gastric cancer) were observed even withsmall-caliber endoscopy. Biopsy revealed a well-moderately differentiated tubular adenocarcinoma, and endoscopic submucosaldissection was performed. Histopathological examination of the specimen confirmed well-moderately differentiated adenocarcinomalocalized to the mucosa with slight depression compared to the surrounding mucosa, consistent with the endoscopic findings. Thissmall early gastric cancer became clearly visible with blue laser imaging using small-caliber endoscopy.
Hong, Youngjoo,Makita, Shuich,Yamanari, Masahiro,Miura, Masahiro,Kim, Soohyun,Yatagai, Toyohiko,Yasuno, Yoshiaki Optical Society of America 2007 Optics express Vol.15 No.12
<P>Scattering optical coherence angiography (S-OCA) is a noninvasive imaging method that is based on the high-speed standard 800nm band spectral-domain optical coherence tomography (SD-OCT) and the ultra-high-resolution SD-OCT which has the axial resolution of 6.1 mum and 2.9 mum in tissue, respectively. In this paper, we have demonstrated the use of this method for in vivo human retinal imaging. A three-dimensional view of the choroidal vasculature was obtained by segmenting the choroidal vessels; this was done using intensity threshold based binarization at each depth plane relative to the retinal pigment epithelium. A vascular projection image was obtained by integrating the segmented choroidal vasculature. In order to assess the feasibility of the proposed method, we compared these images with those obtained using existing invasive methods such as fluorescein angiography and indocyanine green angiography. Clinically worthful images are obtained from the application of S-OCA to the agerelated macular degeneration and polypoidal choroidal vasculopathy.</P>
Use of Imaging Agent to Determine Postoperative Indwelling Epidural Catheter Position
Uchino, Tetsuya,Hagiwara, Satoshi,Iwasaka, Hideo,Kudo, Kyosuke,Takatani, Junji,Mizutani, Akio,Miura, Masahiro,Noguchi, Takayuki The Korean Pain Society 2010 The Korean Journal of Pain Vol.23 No.4
Background: Epidural anesthesia is widely used to provide pain relief, whether for surgical anesthesia, postoperative analgesia, treatment of chronic pain, or to facilitate painless childbirth. In many cases, however, the epidural catheter is inserted blindly and the indwelling catheter position is almost always uncertain. Methods: In this study, the loss-of-resistance technique was used and an imaging agent was injected through the indwelling epidural anesthesia catheter to confirm the position of its tip and examine the migration rate. Study subjects were patients scheduled to undergo surgery using general anesthesia combined with epidural anesthesia. Placement of the epidural catheter was confirmed postoperatively by injection of an imaging agent and X-ray imaging. Results: The indwelling epidural catheter was placed between upper thoracic vertebrae (n = 83; incorrect placement, n = 5), lower thoracic vertebrae (n = 123; incorrect placement, n = 5), and lower thoracic vertebra-lumbar vertebra (n = 46; incorrect placement, n = 7). In this study, a relatively high frequency of incorrectly placed epidural catheters using the loss-of-resistance technique was observed, and it was found that incorrect catheter placement resulted in inadequate analgesia during surgery. Conclusions: Although the loss-of-resistance technique is easy and convenient as a method for epidural catheter placement, it frequently results in inadequate placement of epidural catheters. Care should be taken when performing this procedure.
Use of Imaging Agent to Determine Postoperative Indwelling Epidural Catheter Position
( Tetsuya Uchino ),( Satoshi Hagiwara ),( Hideo Iwasaka ),( Kyosuke Kudo ),( Junji Takatani ),( Akio Mizutani ),( Masahiro Miura ),( Takayuki Noguchi ) 대한통증학회 2010 The Korean Journal of Pain Vol.23 No.4
Background: Epidural anesthesia is widely used to provide pain relief, whether for surgical anesthesia, postoperative analgesia, treatment of chronic pain, or to facilitate painless childbirth. In many cases, however, the epidural catheter is inserted blindly and the indwelling catheter position is almost always uncertain. Methods: In this study, the loss-of-resistance technique was used and an imaging agent was injected through the indwelling epidural anesthesia catheter to confirm the position of its tip and examine the migration rate. Study subjects were patients scheduled to undergo surgery using general anesthesia combined with epidural anesthesia. Placement of the epidural catheter was confirmed postoperatively by injection of an imaging agent and X-ray imaging. Results: The indwelling epidural catheter was placed between upper thoracic vertebrae (n = 83; incorrect placement, n = 5), lower thoracic vertebrae (n = 123; incorrect placement, n = 5), and lower thoracic vertebra-lumbar vertebra (n = 46; incorrect placement, n = 7). In this study, a relatively high frequency of incorrectly placed epidural catheters using the loss-of-resistance technique was observed, and it was found that incorrect catheter placement resulted in inadequate analgesia during surgery. Conclusions: Although the loss-of-resistance technique is easy and convenient as a method for epidural catheter placement, it frequently results in inadequate placement of epidural catheters. Care should be taken when performing this procedure. (Korean J Pain 2010; 23: 247-253)