Faculty Profiles - ODA, Masahiro

Papers - ODA, Masahiro

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Extraction of membrane structure in eyeball from MR volumes Reviewed

Oda Masahiro, Kin Taichi, Mori Kensaku

SPIE MEDICAL IMAGING 2017: BIOMEDICAL APPLICATIONS IN MOLECULAR, STRUCTURAL, AND FUNCTIONAL IMAGING Vol. 10137 2017

Influence of using 3D images and 3D-printed objects on the formation of spatial mental models of experts and novices

MAEHIGASHI Akihiro, MIWA Kazuhisa, ODA Masahiro, NAKAMURA Yoshihiko, MORI Kensaku, IGAMI Tsuyoshi

JSAI Technical Report, SIG-ALST Vol. 79 ( 0 ) 2017

Influence of using 3D images and 3D-printed objects on spatial reasoning of experts and novices

Maehigashi A., Miwa K., Oda M., Nakamura Y., Mori K., Igami T.

CogSci 2017 - Proceedings of the 39th Annual Meeting of the Cognitive Science Society: Computational Foundations of Cognition page： 2669 - 2674 2017

Language：Japanese Publisher：CogSci 2017 - Proceedings of the 39th Annual Meeting of the Cognitive Science Society: Computational Foundations of Cognition

This study focuses on the infuence of a three-dimensional (3D) graphic image and a 3D-printed object on the spatial reasoning of experts and novices in the medical field. The spatial reasoning task of this study required doctors specializing in digestive surgery to infer cross sections of a liver with a 3D image and a 3D-printed object in a situation where liver resection surgery was simulated. The task performance was compared with that of university students who conducted the same task in Maehigashi et al. (2016). The results of the analysis indicated that the doctors showed the same task performance when using the 3D image and the 3D-printed object. However, the university students learned faster and inferred the inside of a liver structure more accurately with the 3D-printed object than with the 3D image, and they performed equally to the professional doctors. Our results are then discussed in relation to previous studies.

Scopus

Hierarchical 3D fully convolutional networks for multi-organ segmentation.

Holger R. Roth, Hirohisa Oda, Yuichiro Hayashi, Masahiro Oda, Natsuki Shimizu, Michitaka Fujiwara, Kazunari Misawa, Kensaku Mori

CoRR Vol. abs/1704.06382 2017

Impact of an automated system for endocytoscopic diagnosis of small colorectal lesions: an international web-based study Reviewed

Yuichi Mori, Shin-ei Kudo ,Philip Wai Yan Chiu, Rajvinder Singh, Masashi Misawa, Kunihiro Wakamura, Toyoki Kudo, Takemasa Hayashi, Atsushi Katagiri, Hideyuki Miyachi, Fumio Ishida, Yasuharu Maeda, Haruhiro Inoue, Yukitaka Nimura, Masahiro Oda, Kensaku Mori

Endoscopy Vol. 48 ( 12 ) page： 1110 - 1118 2016.8

Impact of an automated system for endocytoscopic diagnosis of small colorectal lesions: an international web-based study Reviewed

Yuichi Mori, Shin-ei Kudo, Philip Wai Yan Chiu, Rajvinder Singh, Masashi Misawa, Kunihiro Wakamura, Toyoki Kudo, Takemasa Hayashi, Atsushi Katagiri, Hideyuki Miyachi, Fumio Ishida, Yasuharu Maeda, Haruhiro Inoue, Yukitaka Nimura, Masahiro Oda, Kensaku Mori

Endoscopy Vol. 48 ( 12 ) page： 1110 - 1118 2016.8

Clinical application of a surgical navigation system based on virtual laparoscopy in laparoscopic gastrectomy for gastric cancer Reviewed International coauthorship

Yuichiro Hayashi, Kazunari Misawa, Masahiro Oda, David J. Hawkes, Kensaku Mori

International Journal of Computer Assisted Radiology and Surgery Vol. 11 ( 5 ) page： 827 - 836 2016.5

Clinical application of a surgical navigation system based on virtual laparoscopy in laparoscopic gastrectomy for gastric cancer Reviewed International coauthorship

Yuichiro Hayashi, Kazunari Misawa, Masahiro Oda, David J. Hawkes, Kensaku Mori

International Journal of Computer Assisted Radiology and Surgery Vol. 11 ( 5 ) page： 827 - 836 2016.5

Pneumoperitoneum simulation based on mass-spring-damper models for laparoscopic surgical planning Reviewed

Yukitaka Nimura, Jia Di Qu, Yuichiro Hayashi, Masahiro Oda, Takayuki Kitasaka, Makoto Hashizume, Kazunari Misawa, and Kensaku Mori

Journal of Medical Imaging Vol. 2 ( 4 ) 2015.12

Pneumoperitoneum simulation based on mass-spring-damper models for laparoscopic surgical planning Reviewed

Yukitaka Nimura, Jia Di Qu, Yuichiro Hayashi, Masahiro Oda, Takayuki Kitasaka, Makoto Hashizume, Kazunari Misawa, and Kensaku Mori

Journal of Medical Imaging Vol. 2 ( 4 ) 2015.12

Automated anatomical labeling of abdominal arteries and hepatic portal system extracted from abdominal CT volumes Reviewed

Tetsuro Matsuzaki, Masahiro Oda, Takayuki Kitasaka, Yuichiro Hayashi, Kazunari Misawa, Kensaku Mori

Medical Image Analysis Vol. 20 ( 1 ) page： 152 - 161 2015.2

Automated anatomical labeling of abdominal arteries and hepatic portal system extracted from abdominal CT volumes Reviewed

Tetsuro Matsuzaki, Masahiro Oda, Takayuki Kitasaka, Yuichiro Hayashi, Kazunari Misawa, Kensaku Mori

Medical Image Analysis Vol. 20 ( 1 ) page： 152 - 161 2015.2

Automated Ulcer Detection Method From CT Images for Computer Aided Diagnosis of Crohn's Disease Reviewed

Masahiro Oda, Takayuki Kitasaka, Kazuhiro Furukawa, Osamu Watanabe, Takafumi Ando, Hidemi Goto, and Kensaku Mori

IEICE Transactions on Information and Systems Vol. E96-D ( 4 ) page： 808 - 818 2013.4

Digital Bowel Cleansing Free Colonic Polyp Detection Method for Fecal Tagging CT Colonography Reviewed

Masahiro ODA, Takayuki KITASAKA, Kensaku MORI, Yasuhito SUENAGA, Tetsuji TAKAYAMA, Hirotsugu TAKABATAKE, Masaki MORI, Hiroshi NATORI, and Shigeru NAWANO

Academic Radiology Vol. 16 ( 4 ) page： 486 - 494 2009.4

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

Rationale and Objectives:
Fecal tagging CT colonography (ftCTC) reduces the discomfort and the inconvenience of patients associated with bowel cleansing procedures prior to CT scanning. In conventional colonic polyp detection techniques for ftCTC, a digital bowel cleansing (DBC) technique is applied to detect polyps in tagged fecal materials (TFM). However, DBC removes the surface of soft tissues and hampers polyp detection. We developed a colonic polyp detection method for CT colonographic examination that enables the detection of polyps surrounded by air and polyps surrounded by TFM without DBC.

Materials and Methods:
CT values inside the polyps surrounded by air and polyps surrounded by TFM tend to gradually increase (blob structure) and decrease (inverse-blob structure) from outward to inward, respectively. We developed blob and inverse-blob structure enhancement filters based on the eigenvalues of a Hessian matrix to detect polyps using their intensity characteristic. False positive elimination is performed using three feature values: volume, maximum value of filter outputs, and standard deviation of CT values inside the polyp candidates.

Results:
The proposed method is applied to 104 cases of ftCTC images that include 57 polyps larger than 6 mm in diameter. The sensitivity of the method was 91.2% (52/57) with 11.4 false positives per case.

Conclusion:
The proposed method detects polyps with high sensitivity and 11.4 false positives per case without adverse effects on the DBC.

DOI： 10.1016/j.acra.2008.10.011

Digital bowel cleansing free colonic polyp detection method from fecal tagging CT images Reviewed

Masahiro ODA, Takayuki KITASAKA, Kensaku MORI, Yasuhito SUENAGA, Tetsuji TAKAYAMA, Hirotsugu TAKABATAKE, Masaki MORI, Hiroshi NATORI, and Shigeru NAWANO

Vol. J91-D ( 7 ) page： 1904 - 1913 2008.7

Authorship：Lead author,　Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)

This paper proposes a method for the detection of colonic polyps from fecal tagging CT images without digital bowel cleansing (DBC). Previous polyp detection methods needed DBC to detect polyps which are surrounded by tagged fecal materials (TFM). However, DBC may changes shapes of polyps
while removing TFM. Our method can detect polyps which are surrounded by air or TFM without any DBC processes. We employ blob and inverse-blob structure enhancement filters based on the eigenvalues of the Hessian matrix. As the results of experiments using 104 cases of abdominal CT images, sensitivity for polyps >= 6mm was 91.2% with 11.4 FPs/case.

A Study on Method of Distortion Reduction of Virtual Unfolded Views of the Colon Reviewed

Masahiro ODA, Yuichiro HAYASHI, Takayuki KITASAKA, Kensaku MORI, and Yasuhito SUENAGA

Medical Imaging Technology Vol. 24 ( 5 ) page： 419 - 428 2006.11

Authorship：Lead author,　Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)

This paper proposes a method for reducing distortions of virtual unfolded (VU) views of the colon. VU views enable physicians to observe a large area of the colonic wall efficiently. A VU view is generated by flattening the colon to a plane on computer. In a previous method, VU views are generated by casting rays of volume rendering perpendicular to the centerline of the colon. However, rays intersected at curved areas of the colon and it caused spurious holes in the VU views. Our previous system generated VU views of a constant height regardless of the perimeter of the colon. Therefore, thin areas of the colon were stretched in the VU views, which caused distortions. In this paper, we propose two methods to improve the quality of VU views. We reduce ray intersections by employing a spring model. This method allocates springs between planes perpendicular to the centerline. Then plane directions are modified by spring forces, which lead to reduce the intersections of the planes. We also reduce distortions by changing the height of VU views according to the perimeter of the colon. We applied the method to eighteen cases of abdominal CT images. Experimental results showed that the method could generate VU views satisfactorily.

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Papers - ODA, Masahiro