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JaLCDOI 10.18926/bgeou/49021
タイトル(別表記) Computation Algorithm Revisited for Normal Probability: Computer-assisted Algorithm for Binomial Approximation (1)
フルテキストURL bgeou_151_093_107.pdf
著者 平井 安久| 中村 忠|
抄録 従来とは逆に2項確率で正規確率を近似する計算法を提案する。この近似計算法は,中心 極限定理,数値微分,低い次数の多項式と巨大な n に対する2項確率の直接計算法を組み 合わせて構成される。これまでの他の正規確率計算法と違い,コンピュータの機能を十分に 利用した方法である。数値実験により,関数項級数展開を用いた近似方法,有理関数近似を 用いた近似方法,連分数展開を用いた近似方法に比べ,提案した方法は広範囲において絶対 相対誤差の基準ではるかに良いことも示された。
キーワード 2項近似 近似法 アルゴリズム 正規確率
出版物タイトル 岡山大学大学院教育学研究科研究集録
発行日 2012-11-27
151巻
開始ページ 93
終了ページ 107
ISSN 1883-2423
言語 日本語
論文のバージョン publisher
NAID 120005053296
著者 三宅 進| 宮村 能子|
発行日 2012-12-03
出版物タイトル 岡山医学会雑誌
124巻
3号
資料タイプ 学術雑誌論文
著者 Matsuura, Koji| Kuroda, Yuka| Yamashita, Keisuke| Funahashi, Hiroaki|
発行日 2010-10-12
出版物タイトル Journal of Reproduction and Development
57巻
1号
資料タイプ 学術雑誌論文
JaLCDOI 10.18926/AMO/48967
フルテキストURL 66_5_423.pdf
著者 Furukawa, Masashi| Izumi, Sadanobu| Tsukuda, Kazunori| Tokumo, Masaki| Sakurai, Jun| Mano, Shohey|
抄録 An 81-year-old man was found to have a pancreatic head tumor on abdominal computed tomography (CT) performed during a follow-up visit for sigmoid colon cancer. The tumor had a diameter of 35mm on the CT scan and was diagnosed as pancreatic head carcinoma T3N0M0. The patient was treated with pylorus-preserving pancreaticoduodenectomy. Histopathological examination showed that the tumor had grown within a hollow structure, was contiguous with a duodenal diverticulum, and had partially invaded the pancreas. Immunohistochemistry results were as follows:CK7 negative, CK20 positive, CD10 negative, CDX2 positive, MUC1 negative, MUC2 positive, MUC5AC negative, and MUC6 negative. The tumor was diagnosed as duodenal carcinoma from the duodenal diverticulum. Preoperative imaging showed that the tumor was located in the head of the pancreas and was compressing the common bile duct, thus making it appear like pancreatic cancer. To the best of our knowledge, this is the second report of a case of duodenal carcinoma from a duodenal diverticulum mimicking pancreatic carcinoma.
キーワード duodenal carcinoma duodenal diverticulum pancreatic carcinoma
Amo Type Case Report
出版物タイトル Acta Medica Okayama
発行日 2012-10
66巻
5号
出版者 Okayama University Medical School
開始ページ 423
終了ページ 427
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 英語
著作権者 CopyrightⒸ 2012 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 23093061
Web of Science KeyUT 000310253900007
JaLCDOI 10.18926/AMO/48966
フルテキストURL 66_5_417.pdf
著者 Horio, Takuya| Ogata, Sho| Tsujimoto, Hironori| Akase, Takayoshi| Takahata, Risa| Yaguchi, Yoshihisa| Maehara, Tadaaki| Hase, Kazuo|
抄録 Esophageal cancers usually exhibit lymph-node metastases. Although a solitary lymph-node metastasis is occasionally found, the involvement of an intrathoracic paraaortic node is rare. We present here an intrathoracic mid-esophageal cancer case in which an accompanying solitary retroaortic mass was found within the posterior mediastinum by integrated positron emission tomography/computed tomography. For diagnosis, thoracoscopic resection of the mass was performed from a left thoracic approach, and histology revealed it to be a squamous cell carcinoma metastasized from the esophageal cancer. Upon radical esophagectomy after neoadjuvant therapy as a T3N1M0 Stage IIIa (AJCC/UICC) cancer, the esophageal cancer was found to have invaded unexpectedly deeply in the vicinity of the descending aorta. Another lymph node within the paraaortic region was also involved (T4N1M0 Stage IIIc). The present case and other cases we review here inform our understanding of metastasis to intrathoracic paraaortic nodes as follows:1) its existence may indicate extensive lymph-node metastasis or direct tumor invasion nearby, and 2) it may be accompanied by other lymph-node involvements in this region, even if it appears solitary upon preoperative investigation. Thus, for radical esophagectomy, sufficient lymph-node dissection is required, even at locations not reached by the usual right thoracic approach. Definitive chemoradiotherapy may be a better choice for preoperatively recognized T3 esophageal cancer when the cancer is accompanied by paraaortic lymph node metastasis.
キーワード esophageal cancer intrathoracic paraaortic lymph node solitary metastasis
Amo Type Case Report
出版物タイトル Acta Medica Okayama
発行日 2012-10
66巻
5号
出版者 Okayama University Medical School
開始ページ 417
終了ページ 421
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 英語
著作権者 CopyrightⒸ 2012 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 23093060
Web of Science KeyUT 000310253900006
著者 Itoh, Ryota| Nagataki, Hiroyuki| Ooshita, Fukuhito| Kakugawa, Hirotsugu| Masuzawa, Toshimitsu|
発行日 2007-07-10
出版物タイトル 8th International Conference on Information Technology Based Higher Education and Training
資料タイプ 会議発表論文
JaLCDOI 10.18926/AMO/48692
フルテキストURL 66_4_363.pdf
著者 Tanaka, Masato| Sugimoto, Yoshihiro| Misawa, Haruo| Takigawa, Tomoyuki| Kunisada, Toshiyuki| Ozaki, Toshifumi|
抄録 Spinal deformity is an important clinical manifestation after surgery for spinal cord tumors. One-third of patients who receive laminectomies and irradiation of the spinal column develop scoliosis, kyphosis, or kyphoscoliosis. Recent reports indicate good results after scoliosis surgery using segmental pedicle screws and a navigation system, but these reported studies have not included surgery for post-laminectomy kyphosis. Hooks and wires are ineffective in such patients who undergo laminectomy, and there are also high perioperative risks with insertion of pedicle screws because landmarks have been lost. Here, we report on the 5-year follow-up of a 13-year-old male patient with post-laminectomy and post-irradiation thoracic kyphoscoliosis after surgical treatment of spinal astrocytoma. Posterior segmental pedicle screw fixation was performed safely using a computer-assisted technique. The authors present the first case report for treatment of this condition using a navigation system.
キーワード astrocytoma scoliosis kyphoscoliosis navigation segmental pedicle screw fixation
Amo Type Case Report
出版物タイトル Acta Medica Okayama
発行日 2012-08
66巻
4号
出版者 Okayama University Medical School
開始ページ 363
終了ページ 368
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 英語
著作権者 CopyrightⒸ 2012 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 22918210
Web of Science KeyUT 000307918900010
JaLCDOI 10.18926/AMO/48559
フルテキストURL 66_3_203.pdf
著者 Ohno, Seiichiro| Harimoto, Takashi| Hirosue, Miyuki| Miyai, Masahiro| Hattori, Kengo| Kuroda, Masahiro| Kanazawa, Susumu| Inamura, Keiji| Kato, Hirokazu|
抄録 Magnetic resonance imaging (MRI) visualization of metallic stent lumens is possible if the stent structure counteracts eddy currents in the lumen induced by the radio frequency magnetic field, B1. To examine the effectiveness of various stent designs in counteracting eddy currents, we anchored eight copper stent models and 2 commercially available nickel-titanium alloy (Nitinol) stents in a gel phantom, perpendicular or parallel to the direction of B1. A mesh stent lumen showed hypointensity irrespective of its alignment relative to B1. A solenoid stent lumen showed hypointensity with the stent axis parallel to B1, but it had the same signal intensity as outside the lumen when perpendicular to B1. A Moebius stent lumen showed no signal reduction, irrespective of alignment relative to B1. Lumens of the commercially available stents showed hypointensity regardless of alignment relative to B1. Computer simulation revealed that the signal intensities of the stents corresponded to magnetic flux densities of B1 in the stents, which are modified by the structure of the stent. While in vivo MRI viewing of a Moebius stent lumen is likely possible regardless of axis alignment, inherent structural weakness may be problematic. As a more practical choice, the solenoid stent is easier to manufacture and generates no hypointensive signal when the axis is parallel to B0.
キーワード MRI visualization of stent lumen solenoid pattern Moebius pattern direction of B1
Amo Type Original Article
出版物タイトル Acta Medica Okayama
発行日 2012-06
66巻
3号
出版者 Okayama University Medical School
開始ページ 203
終了ページ 211
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 英語
著作権者 CopyrightⒸ 2012 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 22729100
Web of Science KeyUT 000305669700003
関連URL http://ousar.lib.okayama-u.ac.jp/metadata/48542
JaLCDOI 10.18926/AMO/48265
フルテキストURL 66_2_155.pdf.pdf
著者 Moriyama, Masahiro| Kawaguchi, Atsuya| Yokokawa, Masaki| Ikeda, Shin| Kitagaki, Hajime| Uchida, Nobue|
抄録 A new hemispherical electrode to heat oral cavity cancer is proposed. The electrode does not produce a hot spot around its edge, a feature that usually arises when using radio frequency (RF) capacitive-type heating. The hemispherical electrode was designed by computer simulation using a 3-D finite element method. To assess its practicality and effectiveness, we built a prototype hemispherical electrode and evaluated its heating characteristics by phantom experiments. The heating effects on the phantom were measured by thermography. The concave phantom surface in contact with the hemispherical electrode showed a uniform increase in temperature, with no obvious edge effect. The proposed electrode allows non-invasive RF capacitive-type heating for intracavity tumors that was not previously considered possible, and should contribute to the multidisciplinary treatment of intracavity tumors.
キーワード radiofrequency heating capacitive-type heating electrode edge effect hemispherical electrode
Amo Type Original Article
出版物タイトル Acta Medica Okayama
発行日 2012-04
66巻
2号
出版者 Okayama University Medical School
開始ページ 155
終了ページ 162
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 英語
著作権者 CopyrightⒸ 2012 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 22525473
Web of Science KeyUT 000303175300008
JaLCDOI 10.18926/AMO/48263
フルテキストURL 66_2_131.pdf.pdf
著者 Jia, Lizhong| Kiryu, Shigeru| Watadani, Takeyuki| Akai, Hiroyuki| Yamashita, Hideomi| Akahane, Masaaki| Ohtomo, Kuni|
抄録 Patients with hepatocellular carcinoma (HCC) complicated by portal vein tumor thrombus (PVTT) have an extremely poor prognosis. It is important to select adequate therapeutic options based on reliable prognostic factors using imaging studies and clinical data. Prognostic factors were analyzed in patients with HCC with PVTT in the first branch or main trunk of the portal vein. From 2000 to 2007, 107 consecutive patients with HCC with PVTT in the major portal vein were reviewed, and diagnostic images and clinical characteristics were retrospectively observed. Thirty-eight possible prognostic factors for survival were analyzed by the log-rank test and multivariate analysis using Coxʼs proportional hazards model. Median overall survival was 14 months following PVTT diagnosis. Survival rates at 6 months, 1, 2, and 3 years were 72.1%, 52.6%, 32.6%, and 29.6%, respectively. Independent prognostic factors for longer survival included:patient age <65 years, Child-Pugh classification A/B, PVTT treatment, accumulation of Lipiodol in the PVTT after TACE, initial radical treatment for HCC, HCC located in a single lobe of the liver, and no invasion of HCC to the hepatic vein or bile duct. Survival was associated with liver function, tumor extension, and treatment for HCC and PVTT.
キーワード hepatocellular carcinoma portal vein tumor thrombus prognostic factors
Amo Type Original Article
出版物タイトル Acta Medica Okayama
発行日 2012-04
66巻
2号
出版者 Okayama University Medical School
開始ページ 131
終了ページ 141
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 英語
著作権者 CopyrightⒸ 2012 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 22525471
Web of Science KeyUT 000303175300006
著者 濱野 亮輔| 稲垣 優| 木村 祐司| 磯田 健太| 北田 浩二| 西江 学| 野村 長久| 徳永 尚之| 高橋 健司| 宮宗 秀明| 常光 洋輔| 大塚 眞哉| 三好 和也| 岩川 和秀| 高橋 正彦| 岩垣 博巳|
発行日 2012-04-01
出版物タイトル 岡山医学会雑誌
124巻
1号
資料タイプ 学術雑誌論文
著者 別宮 洋子| 二宮 善文| 大橋 俊孝|
発行日 2012-04-01
出版物タイトル 岡山医学会雑誌
124巻
1号
資料タイプ 学術雑誌論文
JaLCDOI 10.18926/48127
フルテキストURL mfe_046_021_033.pdf
著者 Kanatani, Kenichi| Niitsuma, Hirotaka|
抄録 Because 3-D data are acquired using 3-D sensing such as stereo vision and laser range finders, they have inhomogeneous and anisotropic noise. This paper studies optimal computation of the similarity (rotation, translation, and scale change) of such 3-D data. We first point out that the Gauss-Newton and the Gauss-Helmert methods, regarded as different techniques, have similar structures. We then combine them to define what we call the modified Gauss-Helmert method and do stereo vision simulation to show that it is superior to either of the two in convergence performance. Finally, we show an application to real GPS geodetic data and point out that the widely used homogeneous and isotropic noise model is insufficient and that GPS geodetic data are prone to numerical problems.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2012-01
46巻
開始ページ 21
終了ページ 33
ISSN 1349-6115
言語 英語
著作権者 Copyright © by the authors
論文のバージョン publisher
NAID 80022451622
JaLCDOI 10.18926/48126
フルテキストURL mfe_046_010_020.pdf
著者 Kanatani, Kenichi|
抄録 We present a new technique for calibrating ultra-wide fisheye lens cameras by imposing the constraint that collinear points be rectified to be collinear, parallel lines to be parallel, and orthogonal lines to be orthogonal. Exploiting the fact that line fitting reduces to an eigenvalue problem, we do a rigorous perturbation analysis to obtain a Levenberg-Marquardt procedure for the optimization. Doing experiments, we point out that spurious solutions exist if collinearity and parallelism alone are imposed. Our technique has many desirable properties. For example, no metric information is required about the reference pattern or the camera position, and separate stripe patterns can be displayed on a video screen to generate a virtual grid, eliminating the grid point extraction processing.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2012-01
46巻
開始ページ 10
終了ページ 20
ISSN 1349-6115
言語 英語
著作権者 Copyright © by the authors
論文のバージョン publisher
NAID 80022451621
JaLCDOI 10.18926/48125
フルテキストURL mfe_046_001_009.pdf
著者 Kanatani, Kenichi| Niitsuma, Hirotaka|
抄録 We optimally estimate the similarity (rotation, translation, and scale change) between two sets of 3-D data in the presence of inhomogeneous and anisotropic noise. Adopting the Lie algebra representation of the 3-D rotational change, we derive the Levenberg-Marquardt procedure for simultaneously optimizing the rotation, the translation, and the scale change. We test the performance of our method using simulated stereo data and real GPS geodetic sensing data. We conclude that the conventional method assuming homogeneous and isotropic noise is insufficient and that our simultaneous optimization scheme can produce an accurate solution.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2012-01
46巻
開始ページ 1
終了ページ 9
ISSN 1349-6115
言語 英語
著作権者 Copyright © by the authors
論文のバージョン publisher
NAID 80022451620
JaLCDOI 10.18926/AMO/48081
フルテキストURL 66_1_53.pdf
著者 Nakamura, Keiichiro| Hongo, Atsushi| Kodama, Junichi| Hiramatsu, Yuji|
抄録 The purpose of this study was to evaluate prognostic factors for epithelial ovarian cancer. We found that the pretreatment values of maximum standardized uptake (SUVmax) of the primary tumor by positron emission tomography/computed tomography (PET/CT), tumor marker CA125 and C-reactive protein (CRP) were correlated with clinical characteristics and prognosis for such patients. The clinical parameters and prognoses and their correlations with SUVmax of primary tumor, CA125 and CRP were examined for 51 patients with primary ovarian cancer. The SUVmax of the primary tumor had a statistically significant association with stage (p=0.010) and histology (p=0.001). CA125 was significant associated with stage (p=0.011), histology (p=0.005) and lymph node metastasis (p=0.025). CRP was also significantly associated with stage (p=0.049). Disease-free survival rates of patients exhibiting a high SUVmax, CA125 and CRP were significantly lower than those exhibiting a low SUVmax, CA125 and CRP levels (p=0.008, 0.034, and 0.037, respectively). Furthermore, overall survival rates of patients exhibiting a high SUVmax were significantly lower than those exhibiting a low SUVmax (p=0.049).The high SUVmax of primary tumor is an important factor for identifying ovarian cancer patients with a predictor for poor prognosis.
キーワード ovarian cancer SUVmax of primary tumor CA125 C-reactive protein predictor for poor prognosis
Amo Type Original Article
出版物タイトル Acta Medica Okayama
発行日 2012-02
66巻
1号
出版者 Okayama University Medical School
開始ページ 53
終了ページ 60
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 英語
著作権者 CopyrightⒸ 2012 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 22358139
Web of Science KeyUT 000300800700007
JaLCDOI 10.18926/AMO/47267
フルテキストURL 65_6_407.pdf
著者 Shiota, Yutaro| Imai, Shigeo| Sasaki, Naomi| Tahara, Koo| Noma, Bunjiro| Horita, Naokatsu| Taniguchi, Akihiko| Ono, Tetsuya|
抄録 Mediastinal lymph node carcinoma of unknown primary site is rare and may have a better prognosis if extensive treatment is performed. Case, A 69-year-old-male presented with a persistent cough. Chest computed tomography (CT) demonstrated a large tumor 9.5×8.2cm, in the mediastinum, compressing the right main bronchus, the right pulmonary artery, and the superior vena cava. Because fiberoptic bronchoscopy was insufficient for diagnosis, mediastinoscopic tumor biopsy under general anesthesia was undertaken. Histological examination revealed adenocarcinoma. Extensive examinations revealed no other neoplastic lesion except in the mediastinum. Mediastinal lymph node carcinoma of unknown primary site was diagnosed. The patient was treated with docetaxel and cisplatin with concurrent thoracic radiation therapy. A month after the start of chemoradiotherapy, the mediastinal tumor regressed markedly. The patient remained free of symptoms without regrowth of the primary site. Exploration of the body showed no further abnormalities 20 months after disease onset.
キーワード mediastinal lymph node unknown primary site chemoradiation
Amo Type Case Report
出版物タイトル Acta Medica Okayama
発行日 2011-12
65巻
6号
出版者 Okayama University Medical School
開始ページ 407
終了ページ 411
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 英語
著作権者 CopyrightⒸ 2011 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 22189482
Web of Science KeyUT 000298516900008
JaLCDOI 10.18926/AMO/47265
フルテキストURL 65_6_395.pdf
著者 Harada, Sosuke| Sato, Shuhei| Suzuki, Etsuji| Okumura, Yoshihiro| Hiraki, Takao| Gobara, Hideo| Mimura, Hidefumi| Kanazawa, Susumu| Kaji, Mitsumasa| Fujiwara, Toshiyoshi|
抄録 The aim of the present study was to assess the diagnostic usefulness of Fluorine-18 fluorodeoxyglucose (18F-FDG) positron emission tomography/computed tomography (PET/CT) in the prediction of local recurrence of malignant lung tumors by analyzing the pre-radiofrequency ablation (RFA) maximal standardized uptake value (SUVmax). We performed a historical cohort study of consecutive malignant lung tumors treated by RFA from January 2007 to May 2008 at Okayama University Hospital. We selected only lung tumors examined by PET/CT within 90 days before RFA and divided them (10 primary and 29 metastatic) into 3 groups according to their tertiles of SUVmax. We calculated recurrence odds ratios in the medium group and the high group compared to the low group using multivariate logistic analysis. After we examined the relationship between SUVmax and recurrence in a crude model, we adjusted for some factors. Tumors with higher SUVmax showed higher recurrence odds ratios (medium group;1.84, high group;4.14, respectively). The tumor size also increased the recurrence odds ratio (2.67);we thought this was mainly due to selection bias because we excluded tumors less than 10mm in diameter. This study demonstrated the pre-RFA SUVmax in PET/CT may be a prognostic factor for local recurrence of malignant lung tumors.
キーワード fluorodeoxyglucose (FDG) positron emission tomography (PET) standardized uptake value (SUV) radiofrequency ablation (RFA) lung
Amo Type Original Article
出版物タイトル Acta Medica Okayama
発行日 2011-12
65巻
6号
出版者 Okayama University Medical School
開始ページ 395
終了ページ 402
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 英語
著作権者 CopyrightⒸ 2011 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 22189480
Web of Science KeyUT 000298516900006
著者 佐藤 太祐| 八木 孝仁| 貞森 裕| 松田 浩明| 篠浦 先| 楳田 祐三| 吉田 龍一| 内海 方嗣| 藤原 俊義|
発行日 2011-12-01
出版物タイトル 岡山医学会雑誌
123巻
3号
資料タイプ 学術雑誌論文
著者 Nagataki, Hiroyuki| Noguchi, Koji| Katsuma, Ryo| Yamauchi, Yukiko| Shibata, Naoki| Yasumoto, Keiichi| Ito, Minoru|
発行日 2011-05
出版物タイトル Proceedings of CSEDU 2011 - 3rd International Conference on Computer Supported Education
1巻
資料タイプ 会議発表論文