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Hiroshi Mizumoto,Masao Imai,Yoshito Yabuta,Shiroh Arii 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
A new type of touch probe for measuring small optical parts is proposed. The probe is excited by a piezoelectric actuator in sinusoidal waveform. When the vibrating probe touches an object, harmonic components of the vibration appear in the power spectrum of the probe vibration. When the power of the second harmonic exceeds a threshold level, it is judged that the probe touches the object. Measuring force is small enough for measuring the surface of optical parts. The touch probe is mounted on a small CMM controlled by a PC and evaluated its performance by measuring a standard steel ball.
Natural History of Early Gastric Cancer: a Case Report and Literature Review
Tomohiro Iwai,Masao Yoshida,Hiroyuki Ono,Naomi Kakushima,Kohei Takizawa,Masaki Tanaka,Noboru Kawata,Sayo Ito,Kenichiro Imai,Kinichi Hotta,Hirotoshi Ishiwatari,Hiroyuki Matsubayashi 대한위암학회 2017 Journal of gastric cancer Vol.17 No.1
Early detection and treatment decrease the mortality rate associated with gastric cancer (GC). However, the natural history of GC remains unclear. An 85-year-old woman was referred to our hospital for evaluation of a gastric tumor. Esophagogastroduodenoscopy identified a 6 mm, flat-elevated lesion at the lesser curvature of the antrum. A biopsy specimen showed a well-differentiated tubular adenocarcinoma.
Present Status of Endoscopic Submucosal Dissection for Non-Ampullary Duodenal Epithelial Tumors
Naomi Kakushima,Masao Yoshida,Yohei Yabuuchi,Noboru Kawata,Kohei Takizawa,Yoshihiro Kishida,Sayo Ito,Kenichiro Imai,Kinichi Hotta,Hirotoshi Ishiwatari,Hiroyuki Matsubayashi,Hiroyuki Ono 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.6
Prediction of histology by endoscopic examination is important in the clinical management of non-ampullary duodenal epithelial tumors (NADETs), including adenoma and adenocarcinoma. The use of a simple scoring system based on the findings of white-light endoscopy or magnified endoscopy with narrow-band imaging is useful to differentiate between Vienna category 3 (C3) and C4/5 lesions. Less invasive endoscopic resection procedures, such as cold snare polypectomy, are quick to perform and convenient for small (<10 mm) C3 lesions. Neoplasms with higher grade histology, such as C4/5 lesions, should be treated by endoscopic mucosal resection (EMR), endoscopic submucosal dissection (ESD), or surgery. Although EMR often requires piecemeal resection, the complication rate is acceptable. Excellent complete resection rates could be achieved by ESD; however, it remains a challenging method considering the high risk of complications. Shielding or closure of the ulcer after ESD is effective at decreasing the risk of delayed bleeding and perforation. Laparoscopic endoscopic cooperative surgery is an ideal treatment with a high rate of en bloc resection and a low rate of complications, although it is limited to high-volume centers. Patients with NADETs could benefit from a multidisciplinary approach to stratify the optimal treatment based on endoscopic diagnoses.
Natural History of Early Gastric Cancer: a Case Report and Literature Review
Iwai, Tomohiro,Yoshida, Masao,Ono, Hiroyuki,Kakushima, Naomi,Takizawa, Kohei,Tanaka, Masaki,Kawata, Noboru,Ito, Sayo,Imai, Kenichiro,Hotta, Kinichi,Ishiwatari, Hirotoshi,Matsubayashi, Hiroyuki The Korean Gastric Cancer Association 2017 Journal of gastric cancer Vol.17 No.1
Early detection and treatment decrease the mortality rate associated with gastric cancer (GC). However, the natural history of GC remains unclear. An 85-year-old woman was referred to our hospital for evaluation of a gastric tumor. Esophagogastroduodenoscopy identified a 6 mm, flat-elevated lesion at the lesser curvature of the antrum. A biopsy specimen showed a well-differentiated tubular adenocarcinoma. The depth of the lesion was estimated to be intramucosal. Although the lesion met the indications for endoscopic resection, periodic endoscopic follow-up was performed due to the patient's advanced age and comorbidities. The mucosal GC invaded into the submucosa 3 years later, and finally progressed to advanced cancer 5 years after the initial examination. The patient died of tumor hemorrhage 6.4 years after the initial examination. In this case, mucosal GC progressed to advanced GC, eventually leading to the patient's death from GC. Early and appropriate treatment is required to prevent GC-related death.
( Shinya Fujie ),( Hirotoshi Ishiwatari ),( Keiko Sasaki Junya Sato ),( Hiroyuki Matsubayashi ),( Masao Yoshida ),( Sayo Ito ),( Noboru Kawata ),( Kenichiro Imai ),( Naomi Kakushima ),( Kohei Takizawa 대한간학회 2019 Gut and Liver Vol.13 No.3
Background/Aims: To compare the diagnostic yield of 20-gauge forward-bevel core biopsy needle (CBN) and 22-gauge needle for endoscopic ultrasound (EUS)-guided fine needle aspiration (FNA) of solid pancreatic masses. Methods: The use of 20-gauge CBN was prospectively evaluated for 50 patients who underwent EUS-FNA from June 2016 to December 2016. Data were compared with those obtained by a retrospective study of 50 consecutive patients who underwent EUS-FNA using standard 22-gauge needles between December 2016 and April 2017. At least two punctures were performed for each patient; the sample from the first pass was used for cytology with or without histology and that from the second pass was used for histology. Sample quantity was evaluated using the sample obtained from the second pass. Results: There was no significant difference in the diagnostic accuracy rate between the first and second passes (20-gauge CBN: 96% [48/50]; standard 22-gauge needle: 88% [44/50]). Samples >10× power fields in length were obtained from 90% (43/48) and 60% (30/50) of patients using the 20-gauge CBN and standard 22-gauge needle, respectively (p=0.01). Technical failure occurred for two patients with the 20-gauge CBN. Conclusions: Diagnostic accuracy of the 20-gauge CBN was comparable to that of the 22-gauge needle. However, two passes with the 20-gauge CBN yielded a correct diagnosis for 100% of patients when technically feasible. Moreover, the 20-gauge CBN yielded core tissue for 90% patients, which was a performance superior to that of the 22-gauge needle. (Gut Liver 2019;13:349-355)
Eiji Toyota,Teruki Sone,Kunihiko Yoshikawa,Hiroaki Mimura,Akihiro Hayashida,Nozomi Wada,Kikuko Obase,Koichiro Imai,Ken Saito,Tomoko Maehama,Masao Fukunaga,Kiyoshi Yoshida 연세대학교의과대학 2010 Yonsei medical journal Vol.51 No.2
Purpose: In cardiac 2-[F-18]fluoro-2-deoxy-D-glucose (FDG)-positron emission tomography (PET) examination,interpretation of myocardial viability in the low uptake region (LUR) has been difficult without additional perfusion imaging. We evaluated distribution patterns of FDG at the border zone of the LUR in the cardiac FDG-PET and established a novel parameter for diagnosing myocardial viability and for discriminating the LUR of normal variants. Materials and Methods: Cardiac FDG-PET was performed in patients with a myocardial ischemic event (n = 22) and in healthy volunteers (n = 22). Whether the myocardium was not a viable myocardium (not-VM) or an ischemic but viable myocardium (isch-VM) was defined by an echocardiogram under a low dose of dobutamine infusion as the gold standard. FDG images were displayed as gray scaled-bull’s eye mappings. FDG-plot profiles for LUR (= true ischemic region in the patients or normal variant region in healthy subjects) were calculated. Maximal values of FDG change at the LUR border zone (a steepness index; Smax scale/pixel) were compared among not-VM, isch-VM, and normal myocardium. Results: Smax was significantly higher for n-VM compared to those with isch-VM or normal myocardium (ANOVA). A cut-off value of 0.30 in Smax demonstrated 100% sensitivity and 83% specificity for diagnosing n-VM and isch-VM. Smax less than 0.23 discriminated LUR in normal myocardium from the LUR in patients with both n-VM and isch-VM with a 94% sensitivity and a 93% specificity. Conclusion: Smax of the LUR in cardiac FDG-PET is a simple and useful parameter to diagnose n-VM and isch-VM, as well as to discriminate thr LUR of normal variants.
PROMOTING START UP OF UASB REACTORS BY ADDING OF WATER ABSORBING POLYMER
今井岡,FUKAGAWA, Masayuki,LIU, Jun,UKITA, Masao,SEKINE, Masahiko,NAKANISHI, Hiroshi 嶺南大學校 環境問題硏究所 1997 環境硏究 Vol.17 No.1
ABSTRACTWe have developed a new approach to enhance granulation by adding water absorbing polymer (WAP) particles into the inoculated digested sludge. In this study, the effect of adding WAP on formation of anaerobic granular sludge was evaluated in lab-scale UASB reactors using two typical synthetic wastewater, i.e. glucose of volatile fatty acid (VFA) mixture solution. In addition, side by side with the lab-scale experiment, a pilot-scale experiment using the VFA mixture was carried out to evaluate the availability of accelerated start-up by adding WAP. The development of granular sludge was significantly enhanced by adding WAP. Granules developed on glucose and VFAs had high methanogenic activities and good settleability. From results of lab-scale experiment, the recommended dosage of WAP was about 750 mg/l of reactor volume. The results, pilot-scale experiment, indicated the availability of accelerated start-up adding WAP.