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| 1 | Quest for the best endoscopic imaging modality for computer-assisted colonic polyp staging显示文摘BACKGROUND It was shown in previous studies that high definition endoscopy, high magnification endoscopy and image enhancement technologies, such as chromoendoscopy and digital chromoendoscopy [narrow-band imaging(NBI), iScan] facilitate the detection and classification of colonic polyps during endoscopic sessions. However, there are no comprehensive studies so far that analyze which endoscopic imaging modalities facilitate the automated classification of colonic polyps. In this work, we investigate the impact of endoscopic imaging modalities on the results of computer-assisted diagnosis systems for colonic polyp staging.AIM To assess which endoscopic imaging modalities are best suited for the computerassisted staging of colonic polyps.METHODS In our experiments, we apply twelve state-of-the-art feature extraction methods for the classification of colonic polyps to five endoscopic image databases of colonic lesions. For this purpose, we employ a specifically designed experimental setup to avoid biases in the outcomes caused by differing numbers of images per image database. The image databases were obtained using different imaging modalities. Two databases were obtained by high-definition endoscopy in combination with i-Scan technology(one with chromoendoscopy and one without chromoendoscopy). Three databases were obtained by highmagnification endoscopy(two databases using narrow band imaging and one using chromoendoscopy). The lesions are categorized into non-neoplastic and neoplastic according to the histological diagnosis.RESULTS Generally, it is feature-dependent which imaging modalities achieve high results and which do not. For the high-definition image databases, we achieved overall classification rates of up to 79.2% with chromoendoscopy and 88.9% without chromoendoscopy. In the case of the database obtained by high-magnification chromoendoscopy, the classification rates were up to 81.4%. For the combination of high-magnification endoscopy with NBI, results of up to 97.4% for one database and up to 84% for the other were achieved. Non-neoplastic lesions were classified more accurately in general than non-neoplastic lesions. It was shown that the image recording conditions highly affect the performance of automated diagnosis systems and partly contribute to a stronger effect on the staging results than the used imaging modality.CONCLUSION Chromoendoscopy has a negative impact on the results of the methods. NBI is better suited than chromoendoscopy. High-definition and high-magnification endoscopy are equally suited. | Georg Wimmer Michael Gadermayr Gernot Wolkersdorfer Roland Kwitt Toru Tamaki Jens Tischendorf Michael Hafner Shigeto Yoshida Shinji Tanaka Dorit Merhof Andreas Uhl | 2019 | World Journal of Gastroenterology2019，25，10： | 2 |
| 2 | Uncovering electron scattering mechanisms in NiFeCoCrMn derived concentrated solid solution and high entropy alloys显示文摘Whilst it has long been known that disorder profoundly affects transport properties,recent measurements on a series of solid solution 3d-transition metal alloys reveal two orders of magnitude variations in the residual resistivity.Using ab initio methods,we demonstrate that,while the carrier density of all alloys is as high as in normal metals,the electron mean-free-path can vary from~10Å(strong scattering limit)to~103Å(weak scattering limit).Here,we delineate the underlying electron scattering mechanisms responsible for this disparate behavior.While site-diagonal,spin dependent,potential scattering is always dominant,for alloys containing only Fe,Co,and Ni the majority-spin channel experiences negligible disorder scattering,thereby providing a short circuit,while for Cr/Mn containing alloys both spin channels experience strong disorder scattering due to an electron filling effect.Somewhat surprisingly,other scattering mechanisms-including displacement,or size effect,scattering which has been shown to strongly correlate with such diverse properties as yield strength—are found to be relatively weak in most cases. | Sai Mu German D.Samolyuk Sebastian Wimmer Maria C.Troparevsky Suffian N.Khan Sergiy Mankovsky Hubert Ebert George M.Stocks | 2019 | npj Computational Materials2019，，1： | 1 |
| 3 | Neural Antecedents of the Endowment Effect显示文摘 | Brian Knutson G. Elliott Wimmer Scott Rick Nick G. Hollon Drazen Prelec George Loewenstein | 2008 | Neuron2008，，5： | 1 |
| 4 | Minimum description length principle applied to camouflage assessment显示文摘 | Georg S Wimmer A Horst B | 2001 | Proceedings of SPIE2001，4370，： | 1 |
| 5 | Neural Predictors of Purchases显示文摘 | Brian Knutson Scott Rick G. Elliott Wimmer Drazen Prelec George Loewenstein | 2007 | Neuron2007，，1： | 1 |
| 6 | ADAPTIVITY IN SPACE AND TIME FOR MAGNETOQUASISTATICS显示文摘这份报纸充分探讨时空适应磁场计算。我们描述适应惠特尼为在未组织的 3D 上解决麦克斯韦的方程的 magnetoquasistatic 明确的表达的有限元素方法有四面的格子。空间网孔精炼并且变粗基于特别为联合及时与线性地含蓄的 Rosenbrock 方法在空间遵守边元素的 tetrahadral H (卷屈) 设计的层次错误评估者。一种嵌入的技术被使用通过可变时间步骤及时得到效率。最后,我们磁性的记录的现在的数字结果写存储研究协会在日本建议的头基准问题。[从作者抽象] | Markus Clemens Jens Lang Delia Teleaga Georg Wimmer | 2009 | Journal of Computational Mathematics2009，27，5： | 1 |
| 7 | Local fractal dimension based approaches for colonic polyp classification显示文摘 | Michael H?fner Toru Tamaki Shinji Tanaka Andreas Uhl Georg Wimmer Shigeto Yoshida | 2015 | Medical Image Analysis2015，，1： | 1 |
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