研究者業績
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  2. 羽石 秀昭

羽石 秀昭

ハネイシ ヒデアキ  (Hideaki Haneishi)

基本情報

所属
千葉大学 フロンティア医工学センター 教授
学位
工学博士(1990年3月 東京工業大学)
工学修士(1987年3月 東京工業大学)
J-GLOBAL ID
200901005404840878
researchmap会員ID
1000010441
外部リンク

研究キーワード

 32

研究分野

 5

経歴

 5

学歴

 3

委員歴

 9
もっとみる

受賞

 36
もっとみる

論文

 235
  • Yuma Iwao, Naoko Kawata, Yuki Sekiguchi, Hideaki Haneishi
    Heliyon 10(17) e37272 2024年9月15日  
    RATIONALE AND OBJECTIVES: To analyze morphological changes in patients with COVID-19-associated pneumonia over time, a nonrigid registration technique is required that reduces differences in respiratory phase and imaging position and does not excessively deform the lesion region. A nonrigid registration method using deep learning was applied for lung field alignment, and its practicality was verified through quantitative evaluation, such as image similarity of whole lung region and image similarity of lesion region, as well as visual evaluation by a physician. MATERIALS AND METHODS: First, the lung field positions and sizes of the first and second CT images were roughly matched using a classical registration method based on iterative calculations as a preprocessing step. Then, voxel-by-voxel transformation was performed using VoxelMorph, a nonrigid deep learning registration method. As an objective evaluation, the similarity of the images was calculated. To evaluate the invariance of image features in the lesion site, primary statistics and 3D shape features were calculated and statistically analyzed. Furthermore, as a subjective evaluation, the similarity of images and whether nonrigid transformation caused unnatural changes in the shape and size of the lesion region were visually evaluated by a pulmonologist. RESULTS: The proposed method was applied to 509 patient data points with high image similarity. The variances in histogram characteristics before and after image deformation were confirmed. Visual evaluation confirmed the agreement between the shape and internal structure of the lung field and the natural deformation of the lesion region. CONCLUSION: The developed nonrigid registration method was shown to be effective for quantitative time series analysis of the lungs.
  • Xingyu Zhou, Chen Ye, Takayuki Okamoto, Yuma Iwao, Naoko Kawata, Ayako Shimada, Hideaki Haneishi
    Japanese Journal of Radiology 2024年8月3日  
  • Takayuki Okamoto, Hiroki Okamura, Takehito Iwase, Tomohiro Niizawa, Yuto Kawamata, Hirotaka Yokouchi, Takayuki Baba, Hideaki Haneishi
    Optics Continuum 2024年6月24日  
  • Naoki Ikezawa, Takayuki Okamoto, Yoichi Yoshida, Satoru Kurihara, Nozomi Takahashi, Taka-aki Nakada, Hideaki Haneishi
    Scientific Reports 14(1) 2024年2月10日  
    Abstract A stroke is a medical emergency and thus requires immediate treatment. Paramedics should accurately assess suspected stroke patients and promptly transport them to a hospital with stroke care facilities; however, current assessment procedures rely on subjective visual assessment. We aim to develop an automatic evaluation system for central facial palsy (CFP) that uses RGB cameras installed in an ambulance. This paper presents two evaluation indices, namely the symmetry of mouth movement and the difference in mouth shape, respectively, extracted from video frames. These evaluation indices allow us to quantitatively evaluate the degree of facial palsy. A classification model based on these indices can discriminate patients with CFP. The results of experiments using our dataset show that the values of the two evaluation indices are significantly different between healthy subjects and CFP patients. Furthermore, our classification model achieved an area under the curve of 0.847. This study demonstrates that the proposed automatic evaluation system has great potential for quantitatively assessing CFP patients based on two evaluation indices.
  • T. Ishikawa, Y. Iwao, G. Akamatsu, S. Takyu, H. Tashima, T. Okamoto, T. Yamaya, H. Haneishi
    2023 IEEE Nuclear Science Symposium, Medical Imaging Conference and International Symposium on Room-Temperature Semiconductor Detectors (NSS MIC RTSD) 2023年11月4日  
もっとみる

MISC

 140
もっとみる

書籍等出版物

 3

講演・口頭発表等

 420
  • Hiroyuki Suzuki Masahiro Yamaguchi, Masuyoshi Yachida, Nagaaki Ohyama, Hideaki Haneishi, Takashi Obi
    OPTICS EXPRESS 2006年
  • Medical Imaging Technology 2006年
  • YOSHIDA Eiji, YAMAYA Taiga, WATANABE Mitsuo, KITAMURA Keishi, KITAMURA Keishi, KOBAYASHI Ayako, HASEGAWA Tomoyuki, OBI Takashi, HANEISHI Hideaki, FUKUSHI Masahiro, MURAYAMA Hideo
    医学物理 2006年
  • 株式会社ニューメディア 2006年
  • T Yamaya, N Hagiwara, T Obi, M Yamaguchi, N Ohyama, K Kitamura, T Hasegawa, H Haneishi, E Yoshida, N Inadama, H Murayama
    PHYSICS IN MEDICINE AND BIOLOGY 2005年11月 IOP PUBLISHING LTD
    A high-performance brain PET scanner, jPET-D4, which provides four-layer depth-of-interaction (DOI) information, is being developed to achieve not only high spatial resolution, but also high scanner sensitivity. One technical issue to be dealt with is the data dimensions which increase in proportion to the square of the number of DOI layers. It is, therefore, difficult to apply algebraic or statistical image reconstruction methods directly to DOI-PET, though they improve image quality through accurate system modelling. The process that requires the most computational time and storage space is the calculation of the huge number of system matrix elements. The DOI compression (DOIC) method, which we have previously proposed, reduces data dimensions by a factor of 1/5. In this paper, we propose a transaxial imaging system model optimized for jPET-D4 with the DOIC method. The proposed model assumes that detector response functions (DRFs) are uniform along line-of-responses (LORs). Then each element of the system matrix is calculated as the summed intersection lengths between a pixel and sub-LORs weighted by a Value from the DRF look-Up-table. 2D numerical simulation results showed that the proposed model cut the calculation time by a factor of several hundred while keeping image quality, compared with the accurate system model. A 3D image reconstruction with the on-the-fly calculation of the system matrix is within the practical limitations by incorporating the proposed model and the DOIC method with one-pass accelerated iterative methods.
  • Physics in Medicine and Biology 2005年11月
  • T Uchiyama, M Yamaguchi, N Ohyama, H Haneishi
    JOURNAL OF IMAGING SCIENCE AND TECHNOLOGY 2005年7月 I S & T - SOC IMAGING SCIENCE TECHNOLOGY
    When the number of primary colors, N, is greater than three, the solutions that present the same XYZ values have N - 3 dimensional freedom. A multiprimary display expands the color gamut and also produces many sets of display signals that present a given set of XYZ tristimulus values, so it can utilize the degrees of freedom. The spectral approximation method is thus well suited for multiprimary displays. It minimizes the difference between the original spectrum and the reproduced spectrum under the constraint of a tristimulus match for a CIE standard observer, so it should reduce the color mismatch for any color matching function. However, this had not been confirmed using actual images. The spectral approximation method may not work well for actual images because such images usually have many colors and shadings, and interactions among them might reduce its effectiveness. Since multiprimary displays are becoming commonly used for electronic commerce, telemedicine, etc., confirming the effectiveness of this method is important. Therefore we conducted a visual experiment using actual images to determine its performance. Comparison with other decomposition methods that do not use spectral approximation suggests the effectiveness of the spectral approximation method. We also developed an algorithm for the spectral approximation method that algebraically derives an optimal solution and yields more precise results with less computational cost than Murakami's one.
  • Journal of Imaging science and Technology 2005年7月
  • Taiga Yamaya, Eiji Yoshida, Masanobu Satoh, Tomoaki Tsuda, Keishi Kitamura, Takashi Obi, Tomoyuki Hasegawa, Hideaki Haneishi, Naoko Inadama, Shuji Tanada, Hideo Murayama
    IEEE Nuclear Science Symposium Conference Record 2005年
    The jPET-D4 is a high-performance brain PET scanner which achieves not only high spatial resolution but also high scanner sensitivity by discriminating 4-layer depth-of-interaction (DOI) information. The scanner is designed to have 5 rings of 24 detector blocks each, and the detector block consists of 1,024 GSO crystals of 2.9 mm × 2.9 mm × 7.5 mm, which are arranged in 4 layers of 16 × 16 arrays. In this paper, we investigated the imaging performance of the JPET-D4 prototype where one of the 5 block-detector rings was assembled. In order to reduce computational cost while retaining the advantage of DOI information in iterative image reconstruction, we have proposed the DOI compression (DOIC) method which reduces data dimensions with suppressing resolution loss. We have also proposed an approximated system model for the JPET-D4 which enables fast system matrix calculation while preserving image quality. The experimental results show that almost uniform spatial resolution of 2 - 3 mm is obtained over the field-of-view by using the 4-layer DOI information. A Huffman phantom image clearly shows the excellent imaging performance of the JPET-D4. © 2005 IEEE.
  • Eiji Yoshida, Taiga Yamaya, Mitsuo Watanabe, Naoko Inadama, Tomoaki Tsuda, Keishi Kitamura, Tomoyuki Hasegawa, Takashi Obi, Hideaki Haneishi, Hideo Murayama
    IEEE Nuclear Science Symposium Conference Record 2005年
    We are developing a high-performance brain PET scanner, jPET-D4. This scanner is designed to achieve not only high spatial resolution but also high sensitivity using four-layered depth-of-interaction (DOI) detectors. The scanner has five detector rings with the ring diameter of 390 mm and each detector ring consists of 24 DOI detectors. In order to identify the crystal of interaction and its energy from PMT output, we have previously proposed the DOI detector calibration method. This method creates position and energy Look-Up-Tables (LUTs) from the uniform irradiation. The position LUT converts location of 2D position histograms to crystal addresses. The energy LUT corrects light output of each crystal. Five detector rings have been installed and calibrated. The average energy resolution for 120 DOI detectors is optimized to 17% ± 1.4%. The scatter fraction for this system is 38% with energy window of 400-600 keV. The sensitivity for point source is 112 kcps/MBq with a 250 keV LLD. © 2005 IEEE.
  • Hidenori Ue, Hideaki Haneishi, Hideyuki Iwanaga, Kazuyoshi Suga
    IEEE Nuclear Science Symposium Conference Record 2005年
    A respiratory-gated SPECT allows image reconstruction at various phase of the respiration and therefore the blur in an image can be avoided. However, it requires long time to accumulate sufficient number of counts at each phase. If the acquisition time is not long enough, the detected count becomes inadequately small and hence the reconstructed image becomes noisy. We have been proposed a method for correcting the motion between different phase images obtained with the respiratory-gated SPECT. By summing motion-corrected phase images, a less noisy and less blurred SPECT image can be obtained. In this paper, the other advantage of motion correction information produced in the middle of motion correction and summation process is described in addition to the review of the proposed method. We found that there are clear differences in respiratory motion between normal lung and lung with disorder, especially, emphysema. Detail analysis of the motion of the lung may serve as an aid for diagnosis. In this paper, the clinical usefulness is discussed through investigation including quantitative evaluation of the respiratory motion, comparison with ventilation planar images and physician's observation on them. © 2005 IEEE.
  • Hideaki Haneishi, Yoshimi Onishi, Hideki Hayashi
    IEEE Nuclear Science Symposium Conference Record 2005年
    We have developed a method that combines a small semiconductor gamma camera with an optical camera to synthesize the two kinds of images and help surgeons to easily identify sentinel lymph nodes on the gastric surface in the cancer resection surgery. The proposed method includes some key techniques such as distortion correction of the optical camera image, distance estimation between the camera head and the object surface using a laser and the optical camera, and perspective transformation of the gamma camera image to fuse with the optical camera image. The method and preliminary experimental results with a prototype setup are presented. © 2005 IEEE.
  • M. Tsuchida, H. Fukuda, J. Kishimoto, H. Kanazawa, M. Yamaguchi, H. Haneishi, N. Ohyama
    IDW/AD '05: PROCEEDINGS OF THE 12TH INTERNATIONAL DISPLAY WORKSHOPS IN CONJUNCTION WITH ASIA DISPLAY 2005, VOLS 1 AND 2 2005年 INST IMAGE INFORMATION & TELEVISION ENGINEERS
    We developed a compact six-primary-color DLP projection display consisting of two single-chip DLP projectors and auto calibration processor (ACP) hardware. Two different types of filler are inserted into each projector so that six primary colors are obtained. The ACP calibrates images from each projector to remove geometrical distortion in real-time from the six primary-color images when they are overlapped on the screen. The image size on the screen is 20 inches, and the resolution is SXGA+. We also developed application software for handling six primary colors.
  • Hidenori Ue, Hideaki Haneishi, Hideyuki Iwanaga, Kazuyoshi Suga
    Progress in Biomedical Optics and Imaging - Proceedings of SPIE 2005年
    A conventional SPECT image of lung is obtained by accumulating the detected count of gamma rays over long acquisition time that contains many respiratory cycles. The lung motion due to respiration during the acquisition makes reconstructed image blurred and may lead to a misdiagnosis. If a respiratory-gated SPECT is used, reconstructed images at various phase of respiration are obtained and the blur in a image can be avoided. However, the respiratory-gated SPECT requires long time to accumulate sufficient number of counts at each phase. If the acquisition time is not long enough, the detected count becomes inadequately small and hence the reconstructed image becomes noisy. We propose a method for correcting the motion between different phase images obtained with the respiratory-gated SPECT. In this method, an objective function consisting of both the degree of similarity between a reference and a deformed image and the smoothness of deformation is defined and optimized. The expansion ratio defined as a ratio of the change of the local volume due to the deformation is introduced to preserve the total activity during the motion correction process. By summing each phase images corrected by this method, a less noisy and less blurred SPECT image can be obtained. Furthermore, this method allows us to analyze the local movement of lung. This method was applied to the computer phantom, the real phantom and some clinical data and the motion correction and visualization of local movements between inspiration and expiration phase images were successfully achieved.
  • Hideaki Haneishi, Satoshi Fujita, Takahiro Kohno, Masahiko Suzuki, Jin Miyagi, Hideshige Moriya
    Progress in Biomedical Optics and Imaging - Proceedings of SPIE 2005年
    Acquisition of exact information of three-dimensional knee joint movement is desired in plastic surgery. Conventional X-ray fluoroscopy provides dynamic but just two-dimensional projected image. On the other hand, three-dimensional CT provides three-dimensional but just static image. In this paper, a method for acquiring three-dimensional knee joint movement using both bi-plane, dynamic X-ray fluoroscopy and static three-dimensional CT is proposed. Basic idea is use of 2D/3D registration using digitally reconstructed radiograph (DRR) or virtual projection of CT data. Original ideal is not new but the application of bi-plane fluoroscopy to natural bones of knee is reported for the first time. The technique was applied to two volunteers and successful results were obtained. Accuracy evaluation through computer mulation and phantom experiment with a knee joint of a pig were also conducted.
  • H Fukuda, T Uchiyama, H Haneishi, M Yamaguchi, N Ohyama
    Color Imaging X: Processing, Hardcopy, and Applications 2005年 SPIE-INT SOC OPTICAL ENGINEERING
    To preserve museum collections of works of art, these collections are often photographed for display in digital museums. However, conventional photography cannot capture spectral characteristics of objects. In this paper, we describe a 16-band camera system designed to produce spectral images of ancient paintings. Results of color reproduction of captured images and results of spectral analysis of images of ancient paintings are also presented. The camera consists of a 200x2000-pixel CCD, a rotational filter turret with 16 interference filters, and a PC-based image capturing and displaying unit. The camera's lens is interchangeable, and it enables two or more different view sizes. Each band image of the camera can be focused independently, and it reduces longitudinal chromatic aberration. A stroboscope is used for lighting, and the rotational filter turret and electrical shutter of the CCD have been synchronized with it. An electric motor-driven photographic platform is used to enable photographing large objects in several shots. We evaluated the results of color estimation for an image taken by this camera using the GretagMacbeth ColorChecker 24-color chart. The average DEab (was 2.09 (maximum DE)(ab) was 4.03). Spectral reflectance were used to analyze a degraded area on an ancient painting.
  • 2005年
  • Medical Imaging 2005 2005年
  • Medical Imaging 2005 2005年
  • Medical Imaging Technology 2005年
  • （社）電子情報通信学会 2005年
  • 日本医用画像工学会 2005年
  • Naoki Hagiwara, Takashi Obi, Taiga Yamaya, Masahiro Yamaguchi, Nagaaki Ohyama, Keishi Kitamura, Hideaki Haneishi, Eiji Yoshida, Naoko Inadama, Hideo Murayama
    IEEE Nuclear Science Symposium Conference Record 2004年12月1日
    The Next Generation PET scanner named JPET-D4 has been developed at the National Institute of Radiological Sciences (NIRS) in Japan. The JPET-D4 has 4 layers DOI detectors [1] and its data size becomes huge to handling. Then at first stage, we plan to apply the reconstruction techniques after the histogramming of list-mode data because it is easy to implement and effective to decrease computational cost. The conventional histogramming technique is inapplicable to 4 layers DOI detectors, so we proposed the new histogramming method which is suitable for the multi-layer DOI detector. In this method, DOI-PET list-mode data is transformed into sinogram with an accurate system model of the crystal Mock. In this paper, we implemented mis method with a full three dimensional system model. And we also applied the method to experimental data with prototype system for the JPET-D4 scanner. Experimental results show that the proposed method keeping the advantage of DOI information, and the image quality of the JPET-D4 is superior to a conventional NonDOI PET scanner. © 2004 IEEE.
  • Taiga Yamaya, Naoki Hagiwara, Takashi Obi, Tomoaki Tsuda, Keishi Kitamura, Tomoyuki Hasegawa, Hideaki Haneishi, Naoko Inadama, Eiji Yoshida, Hideo Murayama
    IEEE Nuclear Science Symposium Conference Record 2004年12月1日
    A high-performance brain PET scanner, jPET-D4, which provides depth-of-interaction (DOI) information, is under development. The scanner is designed to achieve not only high spatial resolution but also high scanner sensitivity with the DOI information obtained from multi-layered thin crystals. The scanner has 5 rings of 24 detector blocks each, and the detector block consists of 1,024 GSO crystals of 2.9mm × 2.9mm × 7.5mm, which are arranged in 4 layers of 16 × 16 arrays. At this stage, a pair of detector blocks and a coincidence circuit has been assembled into an experimental prototype gantry. In this paper, as a preliminary experiment, we have investigated the performance of the jPET-D4's inherent spatial resolution and noise characteristics using the prototype system. Spatial resolution and background noise were measured by using a line source and a uniform cylinder phantom respectively. To avoid systematic error and reduce computational cost in image reconstruction, the DOI compression (DOIC) method followed by the ML-EM with accurate system modeling, that we have previously proposed, was applied. Experimental results showed that the jPET-D4 achieves less than 3mm spatial resolution over the field-of-view. Trade-off results between spatial resolution and background noise also promise an excellent performance of the scanner. © 2004 IEEE.
  • Nagaaki Ohyama, Nagaaki Ohyama, Masahiro Yamaguchi, Masahiro Yamaguchi, Hideaki Haneishi, Hideaki Haneishi
    Final Program and Proceedings - IS and T/SID Color Imaging Conference 2004年12月1日
    The development of Natural Vision (NV) system as an advanced color imaging system was discussed. It was found that NV can reproduce images with exactly the same color and also simulate objects under different illumination. NV is also found to be an advanced color imaging system consisting of image capture, processing, transmission, display, recognition and deals with primary colors depending upon application requirements. It was found that the three primary colors of a conventional display form a color triangle and colors within the triangle could be reproduced accurately by using NV technology.
  • J Conde, H Haneishi, M Yamaguchi, N Ohyama, J Baez
    REVISTA MEXICANA DE FISICA 2004年10月 SOCIEDAD MEXICANA DE FISICA
    Mexican codices are an ancient reading and writing system developed by the pre-Hispanic cultures of Mesoamerica. These pictorial documents are a cultural legacy, part of which dates from the 16(th) century. The collection known as "Collection of Original Mexican Codices" is one of the most important codices collection around the world and it is under the custody of the National Library of Anthropology and History (BNAH, Biblioteca Nacional de Antropologia e Historia) in Mexico City. For preservation of the documents, the collection is kept under limited access and controlled illumination conditions, only tungsten lamps are allowed for illumination of codices and light intensity should no exceed 1000 Lux. In order to achieve accurate color reproduction of codices we have proposed to the BNAH a multispectral aproach. Our color reproduction method is based on the estimation of the spectral reflectance for every pixel in the image from a set of 16 bands multispectral images. Multispectral approach enables us to remove the original tungsten capture illumination and to carry out a color simulation under any arbitrary illumination, for instance CIE-D65, hence this approach enables us to reproduce the true colors of original codices. In this paper we present the results of several approaches for spectra estimation considering the illumination conditions established by the BNAH, and we show a color simulation of a codice replica under CIE-D65.
  • Revista Mexicana de Fisica 2004年10月
  • K Ohsawa, T Ajito, Y Komiya, H Fukuda, H Haneishi, M Yamaguchi, N Ohyama
    JOURNAL OF IMAGING SCIENCE AND TECHNOLOGY 2004年3月 I S & T - SOC IMAGING SCIENCE TECHNOLOGY
    We present the architecture of a six band high-definition television (HDTV) camera system newly developed for accurate color reproduction of motion pictures based on spectral information. The camera has an optical component connecting the objective lens to two conventional HDTV camera heads whose spectral sensitivities are individually adjusted by placing different interference filters between the objective lens and each camera. Evaluation of the accuracy of the color estimation obtained using the six band camera and a conventional RGB, i.e., three band, HDTV camera using simulated and experimentally obtained camera signals showed that the six band camera achieves accurate color estimation. In the experimental evaluation, the average color differences for the 24 color patches of the GretagMacbeth Color Checker for the six band and RGB camera signals were 1.43 and 4.12 delta-E-ab. This system should thus be suitable for a wide variety of applications.
  • T Uchiyama, M Yamaguchi, H Haneishi, N Ohyama
    JOURNAL OF IMAGING SCIENCE AND TECHNOLOGY 2004年3月 I S & T - SOC IMAGING SCIENCE TECHNOLOGY
    We propose a simple but useful method to represent multispectral images captured by multispectral cameras (MSC) with different numbers of bands. When considering accurate color reproduction under an arbitrary illuminant, it is necessary to represent them in a common space with sufficient accuracy of spectral information, estimated from each multispectral image. The principal component analysis (PCA) is useful to reduce the high dimension of the spectral information. However, PCA-based methods may cause both large differences in dynamic range between coefficients of the basis functions derived from the PCA and negative pixel values, therefore, it is not easy to handle or edit coefficient images. To solve the problem, we propose the idea of a virtual multispectral. camera (VMSC) that transforms real multispectral images into virtual multispectral images. We design the sensitivities of the VMSC properly, and our unified representation can avoid some disadvantages of conventional PCA-based methods. We experimentally demonstrate the color reproduction accuracy of our method by comparing it with the PCA-based methods, and we show an example of a virtual multispectral image transformed by our method.
  • Journal of Imaging Science and Technology 2004年3月
  • Journal of Imaging Science and Technology 2004年3月
  • Junko Kishimoto, Masahiro Yamaguchi, Hideaki Haneishi, Nagaaki Ohyama
    ACM SIGGRAPH 2004: Emerging Technologies, SIGGRAPH'04 2004年
  • H Kanazawa, M Mitsui, M Yamaguchi, H Haneishi, N Ohyama
    12TH COLOR IMAGING CONFERENCE: COLOR SCIENCE AND ENGINEERING SYSTEMS, TECHNOLOGIES, APPLICATIONS 2004年 SOC IMAGING SCIENCE & TECHNOLOGY
    Multi-primary color display devices, which have more than four primaries, require more than two sets of control signals to reproduce specific tristimulus values. However, rapid changes in the control signals, even when the reproduced tristimulus values change smoothly, is considered to cause degradation of image quality. Smooth multi-primary color decomposition, which means that the control signals change smoothly when the tristimulus changes smoothly, is required. To meet this requirement, we propose a new method for smooth multi-primary color decomposition based on the spherical average of signal values.
  • T Uchiyama, M Yamaguchi, H Haneishi, N Ohyamaa
    CGIV 2004: SECOND EUROPEAN CONFERENCE ON COLOR IN GRAPHICS, IMAGING, AND VISION - CONFERENCE PROCEEDINGS 2004年 SOC IMAGING SCIENCE & TECHNOLOGY
    This paper reveals one of the advantages of using multiprimary display, which can utilize the degrees of freedom. A spectral-approximation method, which was already proposed, is one of the methods concerning this advantage. This method is based on minimizing the difference between the spectrum of the original object and the reproduced spectrum under the constraint of tristimulus match for the CIE standard observer. We can expect some reduction of the color mismatch for any CMF. However, visual evaluation for actual images has not been reported until now. Therefore, we made a visual experiment to evaluate the spectral-approximation method using, actual images, which contain many colors and shadings. We also present a novel algorithm for the spectral-approximation method.
  • 長谷川智之, 村西浩, 竹内昭博, 柴喜崇, 村山秀雄, 稲玉直子, 山谷泰賀, 吉田英治, 羽石秀昭, 小尾高史
    核医学 2004年
  • 大西良真, 佐藤允信, 羽石秀昭, 萩原直樹, 小尾高史, 北村圭司, 吉田英治, 山谷泰賀, 村山秀雄
    核医学 2004年
  • 萩原直樹, 小尾高史, 山口雅浩, 大山永昭, 北村圭司, 羽石秀昭, 津田倫明, 山谷泰賀, 稲玉直子, 吉田英治, 村山秀雄
    核医学 2004年
  • 山谷泰賀, 萩原直樹, 小尾高史, 北村圭司, 長谷川智之, 津田倫明, 羽石秀昭, 稲玉直子, 吉田英治, 村山秀雄
    核医学 2004年
  • Masahiro Yamaguchi, Masanori, Mitsui Ryo Ishikawa, Hideaki Haneishi, Nagaaki Ohyama
    IS&T/SID's CIC12 LAKE BREAKING NEWS-SPECIAL PAPERS SESSION 2004年
  • Medical Imaging Technology 2004年
  • 朝倉書店 2004年
  • Kenro Ohsawa, Kenro Ohsawa, Hiroyuki Fukuda, Takeyuki Ajito, Yasuhiro Komiya, Hideaki Haneishi, Masahiro Yamaguchi, Nagaaki Ohyama
    Society for Imaging Science and Technology: Image Processing, Image Quality, Image Capture, Systems Conference 2003年12月1日
    The architecture of 6-band HDTV camera system, which is newly developed for accurate color reproduction of motion picture based on spectral information is presented. The 6-band HDTV camera is constructed by an optical system connecting the objective lens and two sets of conventional HDTV cameras whose spectral sensitivities are modified differently by interference filters inserted between the optical system and each camera. We evaluated the accuracy of the color estimations achieved by the 6-band and a conventional RGB (i.e. 3-band) HDTV camera. The evaluations are conducted using simulated camera signals and those obtained by experimental measurements. It is confirmed that the 6-band camera achieves the accurate color estimation for the use in extensive applications. In the experimental evaluation the average color difference of dEab obtained from the 6-band camera signals and the RGB camera signals became 1.43 and 4.12 respectively.
  • Hideto Motomura, Kenro Ohsawa, Hideaki Haneishi, Hideaki Haneishi, Masahiro Yamaguchi, Masahiro Yamaguchi, Nagaaki Ohyama, Nagaaki Ohyama
    Society for Imaging Science and Technology: Image Processing, Image Quality, Image Capture, Systems Conference 2003年12月1日
    Natural Vision Image Data File Format has been developed in order to realize spectral-based color reproduction. This paper introduces the profile format of Natural Vision Image Data File Format. It is based on ICC Profile Format. New Profiles, Tags and Tag Types, therefore, have been developed to cover the lacks of ICC Profile Format for spectral-based color reproduction. The design concepts of Natural Vision System are introduced with respect to the requirements. Input Profiles and Display Profiles are expanded in order to provide spectral characteristics to color reproduction system. ColorSpace Conversion Profiles is expanded in order to provide rendering illuminant and CMFs to Color Reproduction Intent Management System. Relationships between the expanded Profiles and image processing are also descried.
  • H. Haneishi, N. Takita, D. Tsuchida, Y. Mori, H. Toyama, T. Miyamoto
    IEEE Nuclear Science Symposium Conference Record 2003年12月1日
    Radiation therapy for lung cancer using heavy ion particles is going on at the National Institute of Radiological Sciences of Japan. In such a field, image registration between different modalities or different images is very effective for overall and more precious diagnosis and treatment and its realization is strongly desired. In the radiation therapy, three kinds of medical images, namely, CT, SPECT and dose map are used. There are two kinds of CT image, one is CT for treatment planning and the other is CT for diagnosis. For image registration, we use CT images to relate all images. At first, two kinds of CT images are registered by a non-linear transformation method newly developed. Next, CT image for diagnosis and SPECT images are registered by a linear transformation or a rigid body transformation. The dose map has already a good agreement with the CT for treatment planning. Then, the dose map is nonlinearly transformed using the transformation parameters obtained through the CT-CT matching and a SPECT image is linearly transformed using parameters obtained through the CT-SPECT matching. Finally those images are superposed on the CT for diagnosis and evaluation of lung function is performed. The framework of image registration is presented with detail description on non-linear transformation of CT images and the application to the evaluation of lung function is shown.
  • Masanobu Sato, Hideaki Haneishi, Naoko Inadama, Hideo Murayama
    IEEE Nuclear Science Symposium Conference Record 2003年12月1日
    A project for developing a next generation PET scanner named 'jPET-D4' is going on at the National Institute of Radiological Sciences of Japan. In this project, a new four-layer depth of interaction (DOI) detector is proposed to achieve high resolution and high sensitivity. The DOI detector consists of Gd2SiO5: Ce (GSO) crystal array with proper optical reflectors and position sensitive photomultiplier tubes (PSPMT). Previously we have developed a Monte Carlo simulation for the DOI detector of 2×2×4 crystal elements. In this study, in order to simulate the latest version of DOI detector with more crystal elements, we developed a much faster, simplified simulator. The content of simplified simulator and some simulation results for multiple scattering in detector are presented.
  • Naoki Hagiwara, Takashi Obi, Taiga Yamaya, Masahiro Yamaguchi, Nagaaki Ohyama, Keishi Kitamura, Hideaki Haneishi, Hideo Murayama
    IEEE Nuclear Science Symposium Conference Record 2003年12月1日
    The Next Generation PET scanner named JPET-D4 is being carried out at the National Institute of Radiological Sciences (NIRS) in Japan. At this stage, we plan to apply the reconstruction techniques after the histogramming of list-mode data because it is easy to implement and has low computational cost The JPET-D4 has 4 layers DOI detectors and it can obtain true list-mode data However, the conventional histogramming technique is inapplicable to 4 layers DOI detectors, so in this paper we propose a new histogramming method which is suitable for the multi-layer DOI detector. In this method, DOI-PET list-mode data is transformed into sinogram with an accurate system model of the crystal block. We also applied the method to simulated data for the JPET-D4 scanner. Numerical simulation results show that the proposed method reduces sampling error effectively while keeping the advantage of DOI information, and the image quality of JPET-D4 is superior to a conventional NonDOI PET scanner.
  • Satoshi Nambu, Toshio Uchiyama, Masahiro Yamaguchi, Masahiro Yamaguchi, Hideaki Haneishi, Hideaki Haneishi, Nagaaki Ohyama, Nagaaki Ohyama
    Society for Imaging Science and Technology: Image Processing, Image Quality, Image Capture, Systems Conference 2003年12月1日
    We propose a simple but useful method to represent multispectral images with different number of bands that are captured by different kind of multispectral cameras (MSC). It is necessary to represent them in a common space with sufficient accuracy of spectral information when consider-ing editing, such as blending and accurate color reproduce-tion under an arbitrary illuminant. To solve the problem, we utilize the idea of a virtual multispectral camera (VMSC) that transforms real multispectral images into virtual multispectral images. We design the sensitivities of the VMSC properly, and our unified representation can avoid some disadvantages of conventional PCA based methods. We experimentally demonstrate the color reproduction accuracy of our method by comparing with PCA based methods under modified versions of objects to be captured, and the numbers of both MSC and VMSC bands.
  • T Yamaya, N Hagiwara, T Obi, M Yamaguchi, K Kita, N Ohyama, K Kitamura, T Hasegawa, H Haneishi, H Murayama
    IEEE TRANSACTIONS ON NUCLEAR SCIENCE 2003年10月 IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
    A high-performance positron emission tomography (PET) scanner, which measures depth-of-interaction (DOI) information, is under development at the National Institute of Radiological Sciences in Japan. Image reconstruction methods with accurate modeling of the system response functions have been successfully used to improve PET image quality. It is, however, difficult to apply these methods to the DOI-PET scanner because the dimension of DOI-PET data increases in proportion to the square of the number of DOI layers. In this paper, we propose a compressed imaging system model for DOI-PET image reconstruction, in order to reduce computational cost while keeping image quality. The basic idea of the proposed method is that the DOI-PET imaging system is highly redundant. First, DOI-PET data is transformed into compact data so that data bins with highly correlating sensitivity functions are combined. Then image reconstruction methods based on accurate system modeling, such as the maximum likelihood expectation maximization (ML-EM), are applied. The proposed method was applied to simulated data for the DOI-PET scanner operated in 2-D mode. Then the tradeoff between the background noise and the spatial resolution was investigated. Numerical simulation results show that the proposed method followed by ML-EM reduces computational cost effectively while keeping the advantages of the accurate system modeling and DOI information.
  • C Jorge, U Toshio, M Yamaguchi, H Haneishi, N Ohyama
    OPTICS FOR THE QUALITY OF LIFE, PTS 1 AND 2 2003年 SPIE-INT SOC OPTICAL ENGINEERING
    Mexican Codices are an ancient reading and writing system, part of this cultural legacy date from the 16(th) and 17(th) century. For preservation reasons, the collection know as "Collection of Original Mexican Codices" under the custody of the National Library of Anthropology and History in Mexico City is kept under limited access and controlled illumination conditions. It is presented an accurate color reproduction of Codices under simulated average daylight based on spectral reflectance estimation from statistical spectral data using the Wiener estimator, removing the original capture environment illumination. We compare the achieved results between both, a 16 bands multispectral camera and a RGB Nikon D1 camera.
  • T Yamaya, N Hagiwara, T Obi, M Yamaguchi, K Kita, N Ohyama, K Kitamura, T Hasegawa, H Haneishi, H Murayama
    2002 IEEE NUCLEAR SCIENCE SYMPOSIUM, CONFERENCE RECORD, VOLS 1-3 2003年 IEEE
    A high-performance PET scanner, which measures depth-of-interaction (DOI) information, is in progress at the National Institute of Radiological Sciences in Japan. Image reconstruction methods with accurate modeling of the system response functions have been successfully used to improve PET image quality. It is, however, difficult to apply these methods to the DOI-PET system because the dimension of DOI-PET data increases in proportion to the square of the number of DOI layers. In this paper, we propose a compressed imaging system model for DOI-PET image reconstruction, in order to reduce computational cost with keeping image quality. The basic idea of the proposed method is that the DOI-PET system is highly redundant. First, DOI-PET data are transformed into compact data so that data bins of which sensitivity functions highly correlate are combined. Then image reconstruction methods based on accurate system modeling, such as the maximum likelihood expectation maximization (ML-EM), are applied. The proposed method was applied to simulated data for the DOI-PET operated in 2D mode. Then the trade-off between the background noise and the spatial resolution was investigated. Numerical simulation results show that the proposed method followed by ML-EM reduces computational cost effectively with keeping the advantages of the accurate system modeling and DOI information.

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