28 Result(s)
within
Health Informatics
Image Processing and Computer Vision
Pattern Recognition
**ya Sato
Chapter
Conference Paper
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Chapter and Conference Paper
Three-Dimensional Reconstruction and Quantification of Hip Joint Cartilages from Magnetic Resonance Images
A method for automated determination of the distribution of hip joint cartilage thickness from in vivo magnetic resonance (MR) images is described. Three-dimensional (3-D) filtering techniques are combined with t...
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Chapter and Conference Paper
Measurement of Pelvic Tilting Angle During Total Hip Arthroplasty Using a Computer Navigation System
The purpose of this study was to measure pelvic orientation during total hip arthroplasty (THA) in a lateral decubitus position using a computer navigation system with an optical localizer (OPTOTRAK). THA was ...
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Chapter and Conference Paper
Magneto-Optic Hybrid 3-D Sensor for Surgical Navigation
The objective of the work described in this paper was to develop an accurate three dimensional (3-D) sensory system without a line-of-sight requirement for surgical navigation inside the body. Although magneti...
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Chapter and Conference Paper
Detection and Quantification of Line and Sheet Structures in 3-D Images
This paper describes a method for the accurate segmentation of line and sheet structures in 3-D images with the aim of quantitatively evaluating anatomical structures in medical images with line-like shapes su...
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Chapter and Conference Paper
Intraoperative Simulation and Planning Using a Combined Acetabular and Femoral (CAF) Navigation System for Total Hip Replacement
This paper describes intraoperative simulations for the limb length and the range of motion (ROM) adjustment in total hip relacement (THR) surgery, and their utility in intraoperative planning. After implantat...
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Chapter and Conference Paper
Limits to the Accuracy of 3D Thickness Measurement in Magnetic Resonance Images
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 ...
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Chapter and Conference Paper
3D Ultrasound Image Acquisition Using a Magneto-optic Hybrid Sensor for Laparoscopic Surgery
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 w...
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Chapter and Conference Paper
Accuracy Validation of Cone-Beam CT Based Registration
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 surgic...
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Chapter and Conference Paper
A Novel Laser Guidance System for Alignment of Linear Surgical Tools: Its Principles and Performance Evaluation as a Man—Machine System
A novel laser guidance system that uses dual laser beam shooters for the alignment of linear surgical tools is presented. In the proposed system, the intersection of two laser planes generated by dual laser sh...
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Chapter and Conference Paper
Preoperative Analysis of Optimal Imaging Orientation in Fluoroscopy for Voxel-Based 2-D/3-D Registration
We have developed a system for the 3-D localization of anatomical structures without the need for surgical exposure by using multiple-view fluoroscopy images. In this paper, we describe the system and evaluate...
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Chapter and Conference Paper
3D Ultrasound System Using a Magneto-optic Hybrid Tracker for Augmented Reality Visualization in Laparoscopic Liver Surgery
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 m...
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Chapter and Conference Paper
A New Similarity Measure for Nonrigid Volume Registration Using Known Joint Distribution of Target Tissue: Application to Dynamic CT Data of the Liver
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 wi...
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Chapter and Conference Paper
Technical Developments for MR-Guided Microwave Thermocoagulation Therapy of Liver Tumors
We have started clinical studies of MR-guided thermocoagulation therapy of liver tumors. Through this therapy for two years, we have developed new instruments, such as a filter to reduce noise in MRI from the ...
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Chapter and Conference Paper
Accurate Quantification of Small-Diameter Tubular Structures in Isotropic CT Volume Data Based on Multiscale Line Filter Responses
A method fully utilizing multiscale line filter responses is presented to estimate the point spread function (PSF) of a CT scanner and diameters of small tubular structures based on the PSF. The estimation pro...
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Chapter and Conference Paper
Recovery of Liver Motion and Deformation Due to Respiration Using Laparoscopic Freehand 3D Ultrasound System
This paper describes a rapid method for intraoperative recovery of liver motion and deformation due to respiration by using a laparoscopic freehand 3D ultrasound (US) system. Using the proposed method, 3D US i...
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Chapter and Conference Paper
Automated Segmentation of the Liver from 3D CT Images Using Probabilistic Atlas and Multi-level Statistical Shape Model
An atlas-based automated liver segmentation method from 3D CT images is described. The method utilizes two types of atlases, that is, the probabilistic atlas (PA) and statistical shape model (SSM). Voxel-based...
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Chapter and Conference Paper
Thoracoscopic Surgical Navigation System for Cancer Localization in Collapsed Lung Based on Estimation of Lung Deformation
We have developed a thoracoscopic surgical navigation system for lung cancer localization. In our system, the thoracic cage and mediastinum are localized using rigid registration between the intraoperatively d...
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Chapter and Conference Paper
Automated CT Segmentation of Diseased Hip Using Hierarchical and Conditional Statistical Shape Models
Segmentation of the femur and pelvis is a prerequisite for patient-specific planning and simulation for hip surgery. Accurate boundary determination of the femoral head and acetabulum is the primary challenge ...
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Chapter and Conference Paper
Abdominal Multi-organ CT Segmentation Using Organ Correlation Graph and Prediction-Based Shape and Location Priors
The paper addresses the automated segmentation of multiple organs in upper abdominal CT data. We propose a framework of multi-organ segmentation which is adaptable to any imaging conditions without using inten...
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Chapter and Conference Paper
Utilizing Disease-Specific Organ Shape Components for Disease Discrimination: Application to Discrimination of Chronic Liver Disease from CT Data
We describe a method to capture disease-specific components in organ shapes. A statistical shape model, constructed by the principal component analysis (PCA) of organ shapes, is used to define the subspace rep...
