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The 6th International Conference on Biomedical Engineering and Rehabilitation Engineering

作者： Yoshinobu Sato Nobuhiko Sugano Toshihiko Sasama Yoshikazu Nakajima Takahiro Ochi Shinich Tamura Division of Interdisciplinary Image Analysis Department of Orthopaedic Surgery Division of Interdisciplinary Image Analysis Division of Interdisciplinary Image Analysis Division of Computer-Integrated Orthopaedic Surgery Osaka University Graduate School of Medicine Division of Interdisciplinary Image Analysis

This paper presents an outline of our recent efforts on the development and clinicalevaluations of preoperative planning and intraoperative navigation systems for total hip

关键词： simulation Computer-Assisted Orthopaedic Surgery With Intraoperative Simulation and Quantification

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Editorial

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International Journal of image and Graphics 2003年第4期3卷 531-532页

作者： Tamura, Shinichi Chen, Yen-Wei Xu, Gang Division of Interdisciplinary Image Analysis Osaka University Medical School Osaka Japan Department of Electrical and Electronics Engineering University of the Ryukyus Okinawa Japan Department of Computer Science Ritsumeikan University Shiga Japan

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5th International Conference on Medical image Computing and Computer-Assisted Intervention, MICCAI 2002

作者： Masumoto, Jun Sato, Yoshinobu Hori, Masatoshi Murakami, Takamichi Johkoh, Takeshi Nakamura, Hironobu Tamura, Shinichi Division of Interdisciplinary Image Analysis SuitaOsaka565–0871 Japan Department of Radiology Osaka University Graduate School of Medicine SuitaOsaka565–0871 Japan

ISBN: (纸本)3540442251

A new similarity measure for volume registration is proposed, which uses using the assumption that the joint distribution of a target tissue is known. This similarity measure is designed so that it can deal with the tissue slide that occurs at boundaries between the target tissue and other tissues. Pre-segmentation of the target tissue is unnecessary. We intend to apply the proposed measure to registering volumes acquired at different time-phases in dynamic CT scans of the liver using contrast materials. In order to derive the similarity measure, we first formulate the ideal case where the joint distributions of all the tissues are known, after which we derive the measure for a realistic case where only the joint distribution of the target tissue is *** applied the proposed measure experimentally to eight dynamic CT data sets of the liver. After describing a practical method for estimating the joint distribution of the liver from real CT data, we show that the problem of tissue slide is effectively dealt with using the proposed measure. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Tissue

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Three-dimensional ultrasound imaging of breast cancer by a realtime intraoperative navigation system

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Breast Cancer 2005年第2期12卷 122-129页

作者： Inoue, Tomoo Tamaki, Yasuhiro Sato, Yoshinobu Nakamoto, Masahiko Tamura, Shinichi Tanji, Yoshio Taguchi, Tetsuya Noguchi, Shinzaburo Department of Surgical Oncology Osaka University Graduate School of Medicine Suita Osaka 565-0871 2-2-E10 Yamadaoka Japan Division of Interdisciplinary Image Analysis Department of Medical Robotics and Image Sciences Osaka University Japan

Background: In order to achieve a good cosmetic result without increasing the risk of ipsilateral breast cancer recurrence after breast conserving surgery, it is very important to minimize the resection volume of the breast without compromising the negativity of the surgical margin. For this purpose, it is necessary to obtain precise information on tumor extension. We therefore developed a three-dimensional (3-D) ultrasound navigation system for breast cancer surgery, which can be performed in the operating room just before surgery. Methods: We obtained 3-D breast tumor images by the 3-D ultrasound navigation system in 40 patients with primary breast cancer (stage 0-II) who underwent mastectomy or breast conserving surgery. The tumor size was measured in a coronal view of the 3-D tumor image and compared with the tumor size obtained from a pathological map of the tumor extension. Results: We obtained 3-D tumor images in 38 patients (success rate = 95%). The tumor size in the images showed a very strong correlation with the pathological tumor size (r = 0.898). The difference in tumor size between the 3-D images and pathology was less than 1 cm in 29 tumors (76.3%) and less than 2 cm in 36 (94.7%). On the other hand, the difference in tumor size between palpation and pathology was less than 1 cm in 19 out of 38 tumors (50.0%) and less than 2 cm in 29 tumors (76.3%). The absolute difference between the 3-D images and pathology was significantly less than that between palpation and pathology (p = 0.0197). Conclusions: Our 3-D ultrasound navigation system is useful in visualizing breast tumor extension and is more accurate than palpation. The system is expected to be helpful in deciding on the appropriate surgical margin in breast cancer surgery, resulting in a better cosmetic outcome without increasing the risk of surgical margin positivity.

关键词： 3-D Breast cancer Navigation Ultrasound

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A computer-assisted curved-bladed Tuke Saw for spherical osteotomy

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International Congress Series 2005年 1281卷 702-707页

作者： Koyama, T. Sugano, N. Nishii, T. Miki, H. Sato, Y. Yoshikawa, H. Tamura, S. Division of Robotic Therapy Osaka University Graduate School of Medicine Osaka Japan Department of Orthopaedic Surgery Osaka University Graduate School of Medicine Osaka Japan Division of Interdisciplinary Image Analysis Osaka University Graduate School of Medicine Osaka Japan

In order to perform spherical osteotomy precisely, quickly and safely, we have developed a novel computer-assisted surgical tool utilizing an oscillating bone saw, "Tuke Saw," with a curved-blade in combination with a CT-based optical navigation system. In this study, the accuracy and feasibility of this curved-bladed Tuke Saw in spherical osteotomy were examined in comparison with the conventional curved chisel. Hemispherical osteotomy on rectangular parallelepiped blocks of Sawbones and rotational acetabular osteotomy on cadaveric pelves were performed with these surgical tools. With both the tools, the distance error of the actual osteotomy surface from the sphere of the plan got larger when the position got deeper, however, the extent was smaller with the curved-bladed Tuke Saw. The procedure time with the curved-bladed Tuke Saw was about half of that with the curved chisel. Therefore, it can be said that the curved-bladed Tuke Saw is more accurate and feasible than the conventional curved chisel. © 2005 CARS and Elsevier B.V.

关键词： Computer-assisted orthopaedic surgery CT-based optical navigation Curved-bladed Tuke Saw Rotational acetabular osteotomy Spherical osteotomy

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Accuracy validation of cone-beam CT based registration 4th

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4th International Conference on Medical image Computing and Computer-Assisted Intervention, MICCAI 2001

作者： Nakajima, Yoshikazu Sasama, Toshihiko Sato, Yoshinobu Nishii, Takashi Sugano, Nobuhiko Ishikawa, Takashi Yonenobu, Kazuo Ochi, Takahiro Tamura, Shinichi Division of Interdisciplinary Image Analysis Osaka University Graduate School of Medicine Japan Department of Orthopaedic Surgery Osaka University Graduate School of Medicine Japan Division of Computer Integrated Orthopaedic Surgery Osaka University Graduate School of Medicine Japan Hitachi Medical Corporation Japan

ISBN: (纸本)3540426973

In this paper, the accuracy of intraoperative registration using cone-beam CT for computer-assisted surgery is preliminarily evaluated. Since cone-beam CT enables whole-surface detection of bone without surgical exposure, highly accurate registration is potentially attainable. In in vitro experiments, much higher accuracy could be attained by acquiring the intraoperative bone surface using cone-beam CT (0.56 mm) as compared with that of our routinely used protocol employing a 3-D positional sensor (1.43mm). © Springer-Verlag Berlin Heidelberg 2001.

关键词： Bone

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3D ultrasound system using a magneto-optic hybrid tracker for augmented reality visualization in laparoscopic liver surgery 5th

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5th International Conference on Medical image Computing and Computer-Assisted Intervention, MICCAI 2002

作者： Nakamoto, Masahiko Sato, Yoshinobu Miyamoto, Masaki Nakamjima, Yoshikazu Konishi, Kozo Shimada, Mitsuo Hashizume, Makoto Tamura, Shinichi Division of Interdisciplinary Image Analysis Osaka University Graduate School of Medicine Japan Department of Disaster and Emergency Medicine Graduate School of Medical Science Kyushu University Japan Department of Surgery II Graduate School of Medical Science Kyushu University Japan

ISBN: (纸本)3540442251

A three-dimensional ultrasound (3D-US) system suitable for laparoscopic surgery that uses a novel magneto-optic hybrid tracker configuration. Our aim is to integrate 3D-US into a laparoscopic AR system. A 5D miniature magnetic tracker is combined with a 6D optical tracker outside the body to perform 6D tracking of a flexible US probe tip in the abdominal cavity. 6D tracking parameters at the tip are obtained by combining the 5D parameters at the tip inside the body, the 6D parameters at the US probe handle outside the body, and the restriction of the tip motion relative to the handle. The system was evaluated in comparison with a conventional 3D ultrasound system. Although the accuracy of the proposed system was somewhat inferior to that of the conventional one, both the accuracy and sweet spot area were found to be acceptable for clinical use. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Augmented reality

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3D ultrasound image acquisition using a magneto-optic hybrid sensor for laparoscopic surgery 4th

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4th International Conference on Medical image Computing and Computer-Assisted Intervention, MICCAI 2001

作者： Sato, Yoshinobu Miyamoto, Masaki Nakamoto, Masahiko Nakajima, Yoshikazu Shimada, Mitsuo Hashizume, Makoto Tamura, Shinichi Division of Interdisciplinary Image Analysis Osaka University Graduate School of Medicine Japan Department of Surgery II Graduate School of Medical Science Kyushu University Japan Department of Disaster and Emergency Medicine Graduate School of Medical Science Kyushu University Japan

ISBN: (纸本)3540426973

A 3D ultrasound system suitable for laparoscopic surgery using a novel configuration of a magneto-optic hybrid 3D sensor is reported. A miniature magnetic sensor with five degrees of freedom (5D) is combined with an optical sensor outside the body to perform 6D sensing of the flexible probe in the abdominal cavity. The accuracy of the system is evaluated in comparison with a conventional 3D ultrasound system. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Degrees of freedom (mechanics)

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Relationship Between Radiation Dose And Resolution In Angiography

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AIP Conference Proceedings 2004年第1期705卷 1031-1034页

作者： Masatsugu Hirano Katsuhito Yamasaki Masami Torikoshi Sinichi Tamura Division of Interdisciplinary Image Analysis Osaka University Graduate School of Medicine Japan Synchrotron Radiation Research Institute National Institute of Radiological Sciences

The relationship between resolution of human vessels and radiation dose in micro‐angiography was evaluated. The radiation dose required to visualize vessels increased as a function of the −4th power of the resolution of vessel images. Since vessels are overlapped in angiograms, resolution of the target vessel is poor. We discuss resolution of 1 mm vessels in selective angiography.

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Limits to the accuracy of 3D thickness measurement in magnetic resonance images 4th

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4th International Conference on Medical image Computing and Computer-Assisted Intervention, MICCAI 2001

作者： Sato, Yoshinobu Nakanishi, Katsuyuki Tanaka, Hisashi Nishii, Takashi Sugano, Nobuhiko Nakamura, Hironobu Ochi, Takahiro Tamura, Shinichi Division of Interdisciplinary Image Analysis Osaka University Graduate School of Medicine Japan Department of Radiology Osaka University Graduate School of Medicine Japan Department of Orthopaedic Surgery Osaka University Graduate School of Medicine Japan Division of Computer Integrated Orthopaedic Surgery Osaka University Graduate School of Medicine Japan

ISBN: (纸本)3540426973

Measuring the thickness of sheet-like (or plate-like) anatomical structures, such as articular cartilages and brain cortex, in 3D magnetic resonance (MR) images is often an important diagnostic procedure. The purpose of this paper is to investigate the fundamental limits to the accuracy of thickness determination in MR images. Given imaging and postprocessing parameters, the characteristics of thickness determination accuracy are derived by means of a theoretical simulation method, focusing especially on the effect of sheet structure orientation on accuracy in the case of noncubic (anisotropic) voxels. The theoretical simulation was validated by in vitro experiments. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Magnetic resonance

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