Faculty Profiles - KOBAYASHI Koichi

MISC - KOBAYASHI Koichi

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マイクロCTを用いたヒト大腿骨頭の骨梁構造解析

比護祐介, 笹川圭右, 小林公一, 坂本信

日本放射線技術学会総会学術大会予稿集 64th 224 2008

開発した皮下脂肪・内臓脂肪計測ソフトウェアの検討

笹川圭右, 吉田秀義, 小林公一, 田邊裕治, 清徳則雄, 坂本信

日本放射線技術学会総会学術大会予稿集 64th 231 2008

Three-dimensional knee motion analysis using single-plane fluoroscopy

佐藤卓, 小林公一, 谷藤理, 有海明央, 古賀良生, 大森豪

関節外科 27 ( 9 ) 2008

透視X線画像を用いた健常膝の三次元運動解析

谷藤理, 佐藤卓, 小林公一, 有海明央, 古賀良生, 山際浩史, 目良恒, 大森豪

日本整形外科学会雑誌 82 ( 8 ) 2008

New development of automatic measuring software system of subcutaneous visceral fat areas

( 8 ) 41 - 43 2008

IN VIVO ESTIMATION OF PATELLOFEMORAL JOINT CONTACT AREA USING MRI(3B3 Orthopaedic & Rehabilitation Biomechanics VII)

Sakamoto Makoto, Kobayashi Koichi, Tanabe Yuji

Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics 2007 ( 3 ) S198 2007.11

P-33 AUTOMATED IMAGE MATCHING FOR 3-D POSE ESTIMATION OF KNEE USING SINGLE-PLANE FLUOROSCOPY

Kobayashi Koichi, Tanaka Nobuaki, Sakamoto Makoto, Tanabe Yuji

Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics 2007 ( 3 ) S121 2007.11

3次元骨形状モデルの精度に関するMRIの検討

笹川圭右, 渡辺聡, 小林公一, 坂本信, 田邊裕治, 佐藤卓, 古賀良生

日本非破壊検査協会大会講演概要集 2007 171 - 174 2007.10

2方向X線像を用いた骨モデルの自動イメージマッチング

小林公一, 坂本信, 田中伸明, 田邊裕治

日本非破壊検査協会大会講演概要集 2007 167 - 170 2007.10

円柱状剛体圧子による横等方性弾性層のインデンテーション試験に関する応力解析

坂本信, 小林公一

日本非破壊検査協会大会講演概要集 2007 207 - 210 2007.10

MRIを用いた距腿関節接触領域の生体内評価

桐生芳彦, 吉田秀義, 田邊裕治, 小林公一, 坂本信

日本機械学会バイオフロンティア講演会講演論文集 18th ( 18 ) 51 - 52 2007.10

骨の3次元形状モデルのMRIによる検討

笹川圭右, 渡辺聡, 小林公一, 坂本信, 田邊裕治, 佐藤卓, 古賀良生

日本機械学会バイオフロンティア講演会講演論文集 18th ( 18 ) 137 - 138 2007.10

象牙質石灰化度のMicro‐CTによる定量評価

坂本信, 北村拓也, 笹川圭右, 小林公一, 原利昭, 遠藤英昭, 伊藤秀美

日本機械学会バイオフロンティア講演会講演論文集 18th ( 18 ) 143 - 144 2007.10

ヒト大腿海綿骨の3次元形態解析

比護祐介, 笹川圭右, 小林公一, 原利昭, 坂本信

日本機械学会バイオフロンティア講演会講演論文集 18th ( 18 ) 139 - 140 2007.10

膝蓋大腿関節の生体内接触面積の評価

坂本信, 吉田秀義, 小林公一, 田邊裕治

日本機械学会バイオフロンティア講演会講演論文集 18th ( 18 ) 49 - 50 2007.10

OS7-2-1 Estimation of Viscoelastic Properties of Rat Cortical Bone Using Dynamic Nanoindentation

Sakamoto Makoto, Kobayashi Koichi, Tanabe Yuji

Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2007 ( 6 ) "OS7 - 2-1-1"-"OS7-2-1-4" 2007.9

Language：English Publisher：The Japan Society of Mechanical Engineers

The objective of this study was to use the dynamic nanoindentation method to determine viscoelastic properties such as storage modulus and loss tangent of single osteons and interstitial lamellae of rat femoral cortical bone tissue at the microstructural level in a longitudinal direction. The effects of mineral, organic and water contents of bone specimens on viscoelastic properties at the macroscopic level were also investigated. The storage moduli of osteons were significantly lower than those of interstitial lamellae, however, the loss tangents of osteons were higher than those of interstitial lamellae of bone tissues. A correlation was found between the storage modulus and mineral content of rat cortical specimens. Likewise, a linear correlation was also demonstrated between the loss tangent and the organic and water contents of specimens.

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OS7-2-6 Application of near infrared spectroscopy to determination of water content in articular cartilage

Tanabe Yuji, Hamada Kazunari, Kikuchi Tatsuya, Sakamoto Makoto, Kobayashi Koichi, Koga Yoshio

Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2007 ( 6 ) "OS7 - 2-6-1"-"OS7-2-6-5" 2007.9

Language：English Publisher：The Japan Society of Mechanical Engineers

This paper deals with an application of the near infrared (NIR) spectroscopy to quantitative measurement of the water content in human articular cartilage under compressive loading and unloading. Indentation test on human articular cartilage, and the subsequent measurement of the NIR absorbance at the wave length of 1.46 μm have been performed. Difference in time dependent recovery of the NIR absorbance between the normal and degenerated articular cartilage were investigated. The degenerated articular cartilage showed relatively high Mankin (MK) score, an index of cartilage degeneration, and the rapid recovery of the NIR absorbance, while low MK score and slow recovery of the NIR absorbance were observed in the normal articular cartilage. The relations between the NIR absorbance and water content, the NIR absorbance and thickness, and the NIR absorbance and water content per unit thickness were established. The cartilage showed no correlation between the NIR absorbance and water content, but showed the NIR absorbance was in proportion to water content per unit cartilage thickness. Linear relation between thickness and the NIR absorbance was found as well. From these results, water content in human articular cartilage was able to be formulated as a function of the NIR absorbance. It is concluded that non-destructive, low-invasive and quantitative estimation of water content in human articular cartilage can be performed using the NIR spectroscopy.

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OS7-2-3 Estimation of 3D-pose of knee using single plane fluoroscopy and 3D bone model

Kobayashi Koichi, Tanaka Nobuaki, Sakamoto Makoto, Tanabe Yuji

Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2007 ( 6 ) "OS7 - 2-3-1"-"OS7-2-3-3" 2007.9

Language：English Publisher：The Japan Society of Mechanical Engineers

This study aims at developing an accurate method for analyzing in vivo knee kinematics using single plane fluoroscopy and 3D bone models. The study was carried out on 3 porcine knees. Three sphere markers were fixed to both femur and tibia. A CT scan was acquired for each bone to create a 3D bone model. After being CT scanned, the femur and tibia were fixed using an external fixation device, resembling anatomical positions of knee. Ten single plane fluoroscopic images of 3 sets of fixed bones were obtained with different flexion angles and different directions of image acquisition. Digitally reconstructed radiographs (DRRs) were generated from 3D bone volume models by a voxel projection technique. The relative 3D-pose (full 6 degrees-of-freedom parameters) between femur and tibia were determined by matching the DRR of each bone model with the fluoroscopic image by maximizing the similarity measure between the 2 images. The true value of the relative pose was measured by a 3D coordinate measuring machine. The mean errors of the 3 rotation parameters were within 0.5 degrees. For the translation parameters the mean error took its maximal value of 1.5 mm in the out-of-plane direction. The result obtained shows a potential of the proposed method for the accurate analysis of in vivo knee kinematics.

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OS7-2-5 Accuracy of Three-Dimensional Bone Surface Model Reconstructed Using MRI

Sasagawa Keisuke, Watanabe Satoshi, Kobayashi Koichi, Sakamoto Makoto, Sato Takashi, Koga Yoshio

Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2007 ( 6 ) "OS7 - 2-5-1"-"OS7-2-5-4" 2007.9

Language：English Publisher：The Japan Society of Mechanical Engineers

Three-dimensional (3D) bone surface models reconstructed from computed tomography (CT) scan data have been used for surgical planning and intra-operative registration. Although CT scanning is an excellent technique for describing bone structure and geometry, it has disadvantages of radiation exposure and poor ability of visualizing soft tissues such as articular cartilage. Magnetic resonance (MR) is a powerful method for imaging soft tissues without radiation. Recently quantification of cortical bone structure and geometry has been investigated using MR imaging (MRI). The aim of the present study is to examine the precision of 3D MRI-based bone surface models. Porcine femora and tibiae were used for the study. Three polymeric spherical markers containing gadolinium contrast media were fixed to the femur and the tibia, respectively. MRI and CT scanning were performed with routine protocols. 3D bone surface models were reconstructed with a commercial software package. Actual bone dimensions were measured with a caliper at the cross sections where the markers were fixed. These dimensions were compared with those on MRI-based and CT-based models. The distances between two of the three markers were also compared. The maximum differences in dimension between actual bone and model were 2.6 mm for sagittal MRI, 1.4 mm for axial MRI and 0.8 mm for CT, respectively. Errors in the marker distance were within 1.0 mm for both MRI and CT models, showing no significant differences between both models. Automatic tracing of bone outlines may improve the accuracy of MRI models.

桐生芳彦, 吉田秀義, 小林公一, 坂本信, 田辺裕治

日本実験力学会講演論文集 ( 7 ) 318 - 320 2007.8

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