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Search Results: 1 - 10 of 2520 matches for " Satoshi Kawanami "
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Contrast-Enhanced CT Colonography Features of Rectal Carcinoid Tumors  [PDF]
Daisuke Tsurumaru, Satoshi Kawanami, Yusuke Nishimuta, Mitsutoshi Miyasaka, Yoshiki Asayama, Hiroshi Honda
Advances in Computed Tomography (ACT) , 2014, DOI: 10.4236/act.2014.32005
Abstract:

Purpose: The purpose of this study was to retrospectively assess the detectability and enhancement pattern of rectal carcinoid tumors on contrast-enhanced computed tomography colonography (CE-CTC). Methods: The study sample consisted of 12 lesions in nine patients of rectal carcinoid tumors. To evaluate the detectability, two radiologists reviewed axial and 3D images including air enema (AE), virtual endoscopy (VE), and virtual colon dissection (VCD). To determine the contrast enhancement pattern of the tumors, the CT attenuation value of each lesion was measured in three phases. Results: Four of the 12 lesions (33%) were detected on axial images in patients in both the prone and supine positions, the sizes of which were 6 mm or larger. Seven lesions (58%), including the four lesions mentioned above, were detected on 3D images including AE and VE in patients in the prone position, the sizes of which were 5 mm or larger. The ranges of CT attenuation values of the lesions at 40 s, 70 s and 240 s were 112 - 147, 116 - 140 and 82 - 97 HU, respectively. Conclusion: Rectal carcinoid tumors are challenging to detect on CE-CTC. They demonstrated enhancement at the early phase and washout at the delayed phase on CE-CTC.

Gastric Mucosal Changes Caused by Lugol's Iodine Solution Spray: Endoscopic Features of 64 Cases on Screening Esophagogastroduodenoscopy
Daisuke Tsurumaru,Takashi Utsunomiya,Shuji Matsuura,Masahiro Komori,Satoshi Kawanami,Tatsuyuki Ishibashi,Hiroshi Honda
Gastroenterology Research and Practice , 2010, DOI: 10.1155/2010/494195
Abstract: Aim. To clarify the endoscopic mucosal change of the stomach caused by Lugol's iodine solution spray on screening esophagogastroduodenoscopy (EGD). Methods. Sixty-four consecutive patients who underwent EGD for esophageal squamous cell carcinoma screening were included in this study. The records for these patients included gastric mucosa findings before and after Lugol's iodine solution was sprayed. The endoscopic findings of the greater curvature of the gastric body were retrospectively analyzed based on the following findings: fold thickening, exudates, ulcers, and hemorrhage. Results. Mucosal changes occurred after Lugol's solution spray totally in 51 patients (80%). Fold thickening was observed in all 51 patients (80%), and a reticular pattern of white lines was found on the surface of the thickened gastric folds found in 28 of the patients (44%). Exudates were observed in 6 patients (9%). Conclusion. The gastric mucosa could be affected by Lugol's iodine; the most frequent endoscopic finding of this effect is gastric fold thickening, which should not be misdiagnosed as a severe gastric disease. 1. Introduction It is widely accepted that chromoendoscopy using Lugol’s iodine solution is effective for the detection of esophageal squamous cell carcinomas. Mature squamous epithelia, which contain glycogen, are stained deeply by iodine, while mucosal lesions such as dysplasias or carcinomas, which contain little or no glycogen, remain unstained in contrast to the surrounding mucosa [1–4]. Lugol’s iodine, however, can induce mucosal irritation, leading to retrosternal pain and discomfort, and can even induce erosion or ulceration in the esophagus and stomach [1, 5, 6]. There have been several case reports of esophageal and gastric injury caused by Lugol’s iodine [5–7]. In spite of these facts, actual mucosal changes or damage caused by Lugol’s iodine solution have not been sufficiently documented and remain unclear. The aim of our study was to clarify the endoscopic mucosal change of the stomach caused by Lugol’s iodine solution spray on screening esophagogastroduodenoscopy (EGD). 2. Materials and Methods 2.1. Patients Sixty-four consecutive patients (54 men and 10 women; age range, 36–80 years; mean age 64 years) who underwent EGD for esophageal squamous cell carcinoma screening during the period from March 2007 to March 2008 at the Department of Clinical Radiology, Kyushu University Hospital, Fukuoka, Japan, were included in this study. The records for these patients included gastric mucosa findings before and after Lugol’s iodine solution was sprayed.
Efficient Cooling System Using Electrocaloric Effect  [PDF]
Shigeki Hirasawa, Tsuyoshi Kawanami, Katsuaki Shirai
Journal of Electronics Cooling and Thermal Control (JECTC) , 2016, DOI: 10.4236/jectc.2016.62007
Abstract: The electrocaloric effect in thin films of an electrocaloric material has the potential to be used for efficient cooling systems for high power electronic devices. We numerically calculated the effect of parameters in electrocaloric refrigeration with a thermal switch of fluid motion on the thermal performance. The system of changing air and water flow with the pulse generation of cold energy increased the heat transfer efficiency to 67% at a frequency of 5 Hz. The optimum time delay of water flow to increase the heat transfer efficiency was zero at low frequency and became half of the time period to change heat for a high frequency of 100 Hz. When the heat transfer efficiency was high, the final temperature change in water flow was not the maximum temperature change.
Forced Convection Heat Transfer Coefficient and Pressure Drop of Diamond-Shaped Fin-Array  [PDF]
Shigeki Hirasawa, Atsushi Fujiwara, Tsuyoshi Kawanami, Katsuaki Shirai
Journal of Electronics Cooling and Thermal Control (JECTC) , 2014, DOI: 10.4236/jectc.2014.43009
Abstract: Forced convection cooling of fins on a high-temperature wall has been used to cool high-power electronic devices. We numerically calculated and experimentally measured the forced convection heat transfer coefficient and pressure drop of a diamond-shaped fin-array with water flow in this study, which had been reported to have a self-induced flip-flop flow phenomenon. Although the flip-flop flow phenomenon occurred in calculations, it was not observed in experiments. The heat transfer and pressure drop of the diamond-shaped fin-array could be estimated with equations for turbulent flow in tubes.
Temperature and Humidity Control in Greenhouses in Desert Areas  [PDF]
Shigeki Hirasawa, Mai Nakatsuka, Kunio Masui, Tsuyoshi Kawanami, Katsuaki Shirai
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.513134
Abstract:

Water consumption can be reduced by using a greenhouse for agriculture in desert areas. We analyzed the effect of control of ventilation, sprinkler water, and solar radiation shielding on changes of temperature and humidity in a greenhouse under various desert area conditions. We calculated the changes in temperature and humidity in a greenhouse for a whole day in four seasons, and the calculation results of water consumption with and without a greenhouse were compared. When ventilation, shielding, and sprinkler water were controlled under suitable conditions to grow orchids in a desert area, water consumption in July was only 7% of that without a greenhouse.

Hepatic Sinusoidal Obstruction Syndrome without Preceding Medical Events  [PDF]
Yukino Kawanami, Riko Kitazawa, Ryuma Haraguchi, Yasuo Ueda, Yukiko Nishi, Kanazu Ariyasu, Yosuke Mizuno, Sohei Kitazawa
Case Reports in Clinical Medicine (CRCM) , 2016, DOI: 10.4236/crcm.2016.53019
Abstract: Sinusoidal obstruction syndrome (SOS) is one of the severe complications of radiation, anticancer chemotherapy and immunosuppressive agents for transplantation. Autopsy of a case of rapidly progressive, uncontrollable severe ascites, without apparent signs of preceding drug toxicity, revealed a tensely enlarged liver and spleen, and 3000 ml of ascites attributed to secondary portal hypertension. Histopathological analysis disclosed sinusoidal endothelial damage and fibrous expansion from central veins. All the foregoing indicated hepatic SOS that needs to be included in the differential diagnosis of progressive ascites in patients without an apparent history of malignancy or transplantation.
Validity and Reliability of the Japanese Version of the Fertility Quality of Life (FertiQoL) Tool for Couples Undergoing Fertility Treatment  [PDF]
Kyoko Asazawa, Mina Jitsuzaki, Akiko Mori, Tomohiko Ichikawa, Katsuko Shinozaki, Atsumi Yoshida, Masami Kawanami, Hiroshi Kamiyama
Open Journal of Nursing (OJN) , 2018, DOI: 10.4236/ojn.2018.89046
Abstract: Background: FertiQoL, which measures the Quality of Life (QOL) of reproductive partners, has been translated and used in 45 languages in the world. The reliability and validity of the original English version of FertiQoL have been confirmed. However, there is still no report on the reliability and validity of the Japanese version by a large-scale survey. This study aimed to examine the reliability and validity of the Japanese version of the FertiQoL scale for measuring the QOL of patients with reproductive problems. Methods: An unsigned self-filled questionnaire survey was conducted in patients undergoing infertility treatment at seven facilities in the Kanto area in Japan using the 34 items of the Japanese version of the FertiQoL scale. The study design was quantitative cross-sectional descriptive research. The investigation period was from April 2013 to April 2018. The contents of the investigation were attributes, FertiQoL scale, and distress scale. To determine the construct validity, principal component analysis, confirmatory factor analysis, and correlation analysis for each subscale were performed using SPSS Statistics Ver. 23.0 and AMOS Ver. 23.0. The study was performed after obtaining approval from the Research Ethics Review Committee of the responsible institutions to which the researchers belong as an ethical consideration. Results: The participants included 1201 patients undergoing infertility treatment and who provided valid responses. The Cronbach’s α was 0.92, and confirmatory factor analysis identified six domains with 34 items that showed the following values: goodness of fit index = 0.877, adjusted goodness of fit index = 0.855, comparative fit index = 0.893, and root mean square error of approximation = 0.059. The correlation coefficient was 0.669 (p < 0.001) with the distress scale. Conclusions: The Japanese version of FertiQoL showed adequate reliability and validity for assessing the QOL of patients with reproductive problems in Japan.
Progressive metastatic pulmonary calcification after successful renal transplantation
Kazuhiro Yatera,Toshinori Kawanami,Hiroshi Ishimoto,Hiroshi Mukae
European Respiratory Review , 2013,
Abstract:
Dose distribution near thin titanium plate for skull fixation irradiated by a 4-MV photon beam
Shimozato Tomohiro,Yasui Keisuke,Kawanami Ryota,Habara Kousaku
Journal of Medical Physics , 2010,
Abstract: To investigate the effects of scattered radiation when a thin titanium plate (thickness, 0.05 cm) used for skull fixation in cerebral nerve surgery is irradiated by a 4-MV photon beam. We investigated the dose distribution of radiation inside a phantom that simulates a human head fitted with a thin titanium plate used for post-surgery skull fixation and compared the distribution data measured using detectors, obtained by Monte Carlo (MC) simulations, and calculated using a radiation treatment planning system (TPS). Simulations were shown to accurately represent measured values. The effects of scattered radiation produced by high-Z materials such as titanium are not sufficiently considered currently in TPS dose calculations. Our comparisons show that the dose distribution is affected by scattered radiation around a thin high-Z material. The depth dose is measured and calculated along the central beam axis inside a water phantom with thin titanium plates at various depths. The maximum relative differences between simulation and TPS results on the entrance and exit sides of the plate were 23.1% and 12.7%, respectively. However, the depth doses do not change in regions deeper than the plate in water. Although titanium is a high-Z material, if the titanium plate used for skull fixation in cerebral nerve surgery is thin, there is a slight change in the dose distribution in regions away from the plate. In addition, we investigated the effects of variation of photon energies, sizes of radiation field and thickness of the plate. When the target to be irradiated is far from the thin titanium plate, the dose differs little from what it would be in the absence of a plate, though the dose escalation existed in front of the metal plate.
Neonatal appendicitis mimicking intestinal duplication: a case report
Saeki Isamu,Yamanouchi Takeshi,Tanaka Sakura,Kawanami Takashi
Journal of Medical Case Reports , 2012, DOI: 10.1186/1752-1947-6-286
Abstract: Introduction Acute appendicitis is a common disease in older children but rare in neonates. Case presentation We report the case of a 2-day-old Asian baby who suffered from neonatal appendicitis mimicking intestinal duplication. Laparoscopic appendectomy was successfully performed after the trans-umbilical division of adhesions, and the postoperative course was uneventful. Conclusion There are few reports describing abdominal masses caused by appendicitis mimicking intestinal duplication. The laparoscopic approach for neonatal appendicitis is considered to be a safe and useful therapeutic modality with good cosmetic results.
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