2001 34th World Congress of the international Union of Physiological Sciences 26-31 August, Christchurch, New Zealand (http://***/) Annual Congress of the European Society of Cardiology 1-5 September, Stockholm, Swede...
2001 34th World Congress of the international Union of Physiological Sciences 26-31 August, Christchurch, New Zealand (http://***/) Annual Congress of the European Society of Cardiology 1-5 September, Stockholm, Sweden Contact: ECOR, European Heart House, 2035 Route des Colles, Les Templiers BP 179, 06903 Sophia Antipolis Cedex, France (http://***) Novel Optical Developments for Monitoring in Tissue Engineering 3 September, Keele, UK (***) European Congress of medical Physics and Clinical Engineering Congress 12-14 September, Belfast, Northern Ireland Contact: http://*** Annual Scientific Meeting of the American Association of Electrodiagnostic Medicine 3-6 October, Albuquerque, NM, USA (***) Annual Fall Meeting of the Biomedical Engineering Society 4-7 October, Durham, NC, USA (***) MICCA 2001 - medicalimagecomputing and computerassistedintervention 14--17 October, Utrecht, The Netherlands (***) 23rd Annual internationalconference of the IEEE Engineering in Medicine and Biology Society 25-28 October, Istanbul, Turkey Contact: Ms Laura J Wolf, IEEE EMB Society, 445 Hoes Lane, Piscataway, NJ 08855-1331, USA (E-mail: emb-exec@***) 8th World Congress of Intensive Care and Critical Care Medicine 28 October - 3 November, Sydney, Australia Contact: http://*** medical Engineering - 7th Australian and New Zealand Intelligent Information Systems conference 18-21 November, Perth, Australia Contact: http://***/~anziis Observer Perception of Radiological image Formation 29 November, York, UK (***) 33rd Annual Scientific Meeting of British medical Ultrasound Society combined with 13th Euroson Congress 11-14 December, Edinburgh, UK Contact: http://*** 2002 VI World Congress of Echocardiography and Vascular Ultrasound 8-10 February, New Delhi, India (***) American Institute of Ultrasound in Medicine Annual Meeting 10-13 Mar
We describe a system involving a computer-instrumented fluoroscope for the purpose of 3D navigation and guidance using pre-operative diagnostic scans as a reference, The goal of the project is to devise a computer-ass...
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ISBN:
(纸本)3540411895
We describe a system involving a computer-instrumented fluoroscope for the purpose of 3D navigation and guidance using pre-operative diagnostic scans as a reference, The goal of the project is to devise a computer-assisted tool that will improve the accuracy, reduce risk, minimize the invasiveness, and shorten die time it takes to perform a variety of neurosurgical and orthopedic procedures of the spine. For this purpose we propose an apparatus that will track surgical tools and localize them with respect to the patient's anatomy and pre-operative 3D diagnostic scans using intraoperative fluoroscopy for in Situ registration. The resulting system leverages equipment already commonly available in the Operating Room (OR), allowing us to provide important new functionality that is free of many current limitations, while keeping costs contained.
Automatic processing of 3D ultrasound (US) is of great interest for the development of innovative and low-cost computer-assisted surgery tools. In this paper, we present a new image-based technique to rigidly register...
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ISBN:
(纸本)3540411895
Automatic processing of 3D ultrasound (US) is of great interest for the development of innovative and low-cost computer-assisted surgery tools. In this paper, we present a new image-based technique to rigidly register intra-operative 3D US with pre-operative Magnetic Resonance (MR) data. Automatic registration is achieved by maximization of a similarity measure that generalizes the correlation ratio (CR). This novel similarity measure has been designed to better take into account the nature of US images. A preliminary cross-validation study has been carried out using a number of phantom and clinical data. This indicates that the worst registration errors are of the order of the MR resolution.
The aim of this work is to automatically extract quantitative parameters from time sequences of 3D images (4D images) suited to heart pathology diagnosis. In this paper, we propose a framework for the reconstruction o...
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ISBN:
(纸本)3540411895
The aim of this work is to automatically extract quantitative parameters from time sequences of 3D images (4D images) suited to heart pathology diagnosis. In this paper, we propose a framework for the reconstruction of the left ventricle motion from 4D images based on 4D deformable surface models. These 4D models are represented as a time sequence of 3D meshes whose deformation are correlated during the cardiac cycle. Both temporal and spatial constraints based on prior knowledge of heart shape and motion are combined to improve the segmentation accuracy. In contrast to many earlier approaches, our framework includes the notion of trajectory constraint. We have demonstrated the ability of this segmentation tool to deal with noisy or low contrast images on 4D MR, SPECT, and US images.
User guided systems for X-ray/portal image matching are commonly employed in radiation therapy for position verification and correction. To enable extended clinical support a fully acceptable solution must be generic,...
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ISBN:
(纸本)3540411895
User guided systems for X-ray/portal image matching are commonly employed in radiation therapy for position verification and correction. To enable extended clinical support a fully acceptable solution must be generic, accurate, fast and automatic, In this paper a new registration system using the structure tensor is compared with the performance of experienced radiographers. It is shown that local extremum lines (emanating front bone ridges) are invariant with respect to the photon energy and that they can be detected without a priori knowledge. Registration based on such creases is validated with a large database of images from anterior irradiation fields for prostate treatments. It appears that the precision of the structure tensor approach is significantly better than human observers. The execution time is less than 10 seconds while human supervision can be restricted to detect outliers only.
A method is presented to extract and track the position of a guide wire during endovascular interventions under X-ray fluoroscopy. The method can be used to improve guide wire visualization in the low quality fluorosc...
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ISBN:
(纸本)3540411895
A method is presented to extract and track the position of a guide wire during endovascular interventions under X-ray fluoroscopy. The method can be used to improve guide wire visualization in the low quality fluoroscopy images. A two-step procedure is utilized to track the guide wire in subsequent frames. First a rough estimate of the displacement is obtained using a template matching procedure. Subsequently, the position of the guide wire is determined by fitting the guide wire to a feature image in which line-like structures are enhanced. In this optimization step the influence of the scale at which the feature is calculated and the additional value of using directional information is investigated. The method is applied both on the original and subtraction images. Using the proper parameter settings, the guide wire could successfully be tracked based on the original images, in 141 out of 146 frames from 5 image sequences.
Three-dimensional facial information is very important for assessing the influence of clef lip repair and measuring the facial growth between cleft and non-cleft children. In this paper, 3D techniques for measuring fa...
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ISBN:
(纸本)3540411895
Three-dimensional facial information is very important for assessing the influence of clef lip repair and measuring the facial growth between cleft and non-cleft children. In this paper, 3D techniques for measuring facial soft tissue change and extracting useful 3D shape information axe presented. Firstly, a robust 3D registration algorithm which combines landmark-based and surface-based registration techniques is described. It uses a new surface-based registration algorithm - MCP algorithm to refine landmark-based alignment. We then describe a graphical user interface for manually extracting 3D facial landmarks. Experimental tests on both simulated surface data and real facial scans have been carried out to validate the HICP algorithm.
This paper proposes a new methodology for image segmentation based on the integration of deformable and Markov Random Field models. Our method makes use of Markov Random Field theory to build a Gibbs Prior model of me...
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ISBN:
(纸本)3540411895
This paper proposes a new methodology for image segmentation based on the integration of deformable and Markov Random Field models. Our method makes use of Markov Random Field theory to build a Gibbs Prior model of medicalimages with arbitrary initial parameters to estimate the boundary of organs with low signal to noise ratio (SNR). Then we use a deformable model to fit the estimated boundary, The result of the deformable model fit is used to update the Gibbs prior model parameters, such as the gradient threshold of a boundary. Based on the updated parameters we restart the Gibbs prior models. By iteratively integrating these processes we achieve an automated segmentation of the initial images. By careful choice of the method used for the Gibbs prior models, and based on the above method of integration with deformable model our segmentation solution runs in close to real time. Results of the method are presented for several examples, including some MRI images with significant amount of noise.
XIMIT is a newly developed method for precisely measuring the 2D migration of a hip socket implant using standard radiographs. 2D migration is the change of the 2D distance between implant and bone observable in the x...
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ISBN:
(纸本)3540411895
XIMIT is a newly developed method for precisely measuring the 2D migration of a hip socket implant using standard radiographs. 2D migration is the change of the 2D distance between implant and bone observable in the x-ray image. It is measured in order to judge the fixation of the implant in the bone. The proposed method is based on a carefully designed measurement of the 2D distance minimizing the influence of different sources of errors. The magnitude of the entering errors is minimized by estimating the implant's 3D orientation and position using the CAD model of the implant and by involving a state of the art template matching algorithm. According to the first error estimate, the new method makes a migration measurement with a standard deviation of about 0.2 mm possible.
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