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| 2. |
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| 3. |
- Knutsson, Hans, et al.
(författare)
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Spatio-temporal filtering of digital angiography image data
- 1998
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Ingår i: Computer Methods and Programs in Biomedicine. - 0169-2607 .- 1872-7565. ; 57:1-2, s. 115-123
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Tidskriftsartikel (refereegranskat)abstract
- As welfare diseases become more common all over the world the demand for angiography examinations is increasing rapidly. The development of advanced medical signal processing methods has with few exceptions been concentrated towards CT and MR while traditional contrast based radiology depend on methods developed for ancient photography techniques despite the fact that angiography sequences are generally recorded in digital form. This article presents a new approach for processing of angiography sequences based on advanced image processing methods. The developed algorithm automatically processes angiography sequences containing motion artifacts that cannot be processed by conventional methods like digital subtraction angiography (DSA) and pixel shift due to non uniform motions. The algorithm can in simple terms be described as an ideal pixelshift filter carrying out shifts of different directions and magnitude according to the local motions in the image. In difference to conventional methods it is fully automatic, no mask image needs to be defined and the manual pixelshift operations, which are extremely time consuming, are eliminated. The algorithm is efficient and robust and is designed to run on standard hardware of a powerful workstation which excludes the need for expensive dedicated angiography platforms. Since there is no need to make additional recordings if the patient moves, the patient is exposed to less amount of radiation and contrast fluid. The most exciting benefits by this method are, however, that it opens up new areas for contrast based angiography that are not possible to process with conventional methods e.g. nonuniform motions and multiple layers of moving tissue. Advanced image processing methods provide significantly better image quality and noise suppression but do also provide the means to compute flow velocity and visualize the flow dynamics in the arterial trees by e.g. using color. Initial tests have proven that it is possible to discriminate capillary blood flow from angiography data which opens up interesting possibilities for estimating the blood flow in the heart muscle without use of nuclear methods.
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| 4. |
- Koch, Sabine, et al.
(författare)
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Controlled Diagnosis-Oriented Enhancement of Automatically Segmented Radiographs in Dentistry
- 1998
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Ingår i: Computer Methods and Programs in Biomedicine. - 0169-2607 .- 1872-7565. ; 57:1-2, s. 125-131
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Tidskriftsartikel (refereegranskat)abstract
- A method for controlled diagnosis-oriented enhancement of selected regions of interest in intraoral radiographs is presented. Image enhancement is accomplished by adaptive non-linear grey scale transformation depending on the result of objective quality measurement. In order to assure reliable image duality measurement as well as controlled image enhancement, automatic image segmentation is applied to avoid the influence of disturbing factors (e.g. metallic restorations) on quality measurement and image enhancement. Based on existing a-priori knowledge about object structure and composition of the selected regions of interest in intraoral radiographs, different image segmentation algorithms and image enhancement procedures were developed for different types of diagnosis. (C) 1998 Elsevier Science Ireland Ltd. All rights reserved.
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| 5. |
- Kohli, Sunil, et al.
(författare)
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Individuals living in areas with high background radon : a GIS method to identify populations at risk
- 1997
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Ingår i: Computer Methods and Programs in Biomedicine. - 0169-2607 .- 1872-7565. ; 53:2, s. 105-112
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Tidskriftsartikel (refereegranskat)abstract
- Objective: to identify and link populations and individuals that live within high risk areas. Design: census registers and disease registers which contain data on individuals can only give aggregate statistics relating to postal code districts, town, county or state boundaries. However environmental risk factors rarely, if ever, respect these man-made boundaries. What is needed is a method to rapidly identify individuals who may live within a described area or region and to further identify the disease(s) occurring among these individuals and/or in these areas. Method: this paper describes a method for linking the standard registers available in Sweden, notably the residence-property addresses they contain and the geographical coordinate setting of these, to map the population as a point coverage. Using standard GIS methods this coverage could be linked, merged or intersected with any other map to create new subsets of population. Representation of populations down to the individual level by automatised spatialisation of available census data is in its simplicity a new informatics method which in the designated GIS medium adds a new power of resolution. Results: we demonstrate this using the radon maps provided by the local communes. The Swedish annual population registration records of 1991 for the county ofÖstergötland and the property register available at the Central Statistical Bureau of Sweden formed the main data sources. By coupling the address in the population register to the property register each individual was mapped to the centroid of a property. By intersecting the population coverage with the radon maps, the population living in high, normal or low risk areas was identified and then analysed and stratified by commune, sex and age. The resulting tables can be linked to other databases, e.g. disease registers, to visualise and analyse geographical and related patterns. The methodology can be adapted for use with any other environmental map or small area. It can also be expanded to the fourth dimension by linking likewise available migration information to generate immediately coordinate-set, accumulated exposition and similar data.
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| 6. |
- Seipel, Stefan, et al.
(författare)
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Oral Implant Treatment Planning in a Virtual Reality Environment
- 1998
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Ingår i: Computer Methods and Programs in Biomedicine. - 0169-2607 .- 1872-7565. ; 57:1-2, s. 95-103
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Tidskriftsartikel (refereegranskat)abstract
- A system for three-dimensional oral implant treatment planning is presented. Virtual reality technologies are used in order to improve the human image interpretation and planning performance. The methods described are based on computer tomography (CT) data of the mandible and of the maxilla. A novel approach to volume rendering and voxel based modelling of implants is introduced which allows interactive three-dimensional manipulation of the anatomic model and real-time manipulation of virtual implants. A spline-based reconstruction method is described to assess the implant site in a clinically oriented view with regard to bone structures and angulation. Two parameters are deduced which represent the bone properties at the surface of implants. While an implant is navigated with six degrees of freedom, these parameters are acoustically rendered which is a novel approach to exploration of spatial bone properties in a CT data set.
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| 7. |
- Thurfjell, Lennart, et al.
(författare)
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CBA—an atlas-based software tool used to facilitate the interpretation of neuroimaging data
- 1995
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Ingår i: Computer Methods and Programs in Biomedicine. - : ELSEVIER SCI PUBL IRELAND LTD. - 0169-2607 .- 1872-7565. ; 47:1, s. 51-71
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Tidskriftsartikel (refereegranskat)abstract
- CBA, a software tool used to improve quantification and evaluation of neuroimaging data has been developed. It uses a detailed 3-dimensional brain atlas that can be adapted to fit the brain of an individual patient represented by a series of displayed ima
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| 8. |
- af, Klercker T, et al.
(författare)
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Decision support system for primary health care in an inter/intranet environment
- 1998
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Ingår i: COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE. - : ELSEVIER SCI IRELAND LTD. - 0169-2607. ; 55:1, s. 31-37
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The need for easily accessible computerised decision-and documentation-support in primary health care has been previously published. The implementation of such a tool in an intranet environment is described. The use of free-ware which can be downloaded fr
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| 9. |
- Engelmann, U, et al.
(författare)
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Experiences with the German teleradiology system MEDICUS
- 1997
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Ingår i: COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE. - 0169-2607. ; 54:1-2, s. 131-139
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This paper introduces the teleradiology system, MEDICUS, which has been developed at the Deutsches Krebsforschungszentrum (German Cancer Research Center) in Heidelberg, Germany. The system is designed to work on ISDN lines as well as in a local area netwo
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| 10. |
- Hakman, M, et al.
(författare)
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Object-oriented biomedical system modeling - The Rationale
- 1999
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Ingår i: COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE. - : ELSEVIER SCI IRELAND LTD. - 0169-2607. ; 59:1, s. 1-17
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A short tutorial and a rationale for Object-Oriented Biomedical (Continuous) System Modelling (OOBSM) are given. The paper investigates and defines what is needed in order to make the work with complex bio-medical and pathophysiological models easier, les
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| 11. |
- Hakman, M, et al.
(författare)
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Object-oriented biomedical system modelling - the language
- 1999
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Ingår i: COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE. - : ELSEVIER SCI IRELAND LTD. - 0169-2607. ; 60:3, s. 153-181
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The paper describes a new object-oriented biomedical continuous system modelling language (OOBSML). It is fully object-oriented and supports model inheritance, encapsulation, and model component instantiation and behaviour polymorphism. Besides the tradit
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| 12. |
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| 13. |
- Karlsson, A, et al.
(författare)
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The ankle strategy for postural control - A comparison between a model-based and a marker-based method
- 1997
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Ingår i: COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE. - : ELSEVIER SCI IRELAND LTD. - 0169-2607. ; 52:3, s. 165-173
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- When analysing postural control statistical characteristics of the centre of pressure or the ground reaction force are often used. A complement would be to analyse movement strategies as well. The purpose of this Study was to determine to what extent the
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| 14. |
- Koch, S, et al.
(författare)
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Controlled diagnosis-oriented enhancement of automatically segmented radiographs in dentistry
- 1998
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Ingår i: COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE. - : ELSEVIER SCI IRELAND LTD. - 0169-2607. ; 57:1-2, s. 125-131
-
Tidskriftsartikel (refereegranskat)abstract
- A method for controlled diagnosis-oriented enhancement of selected regions of interest in intraoral radiographs is presented. Image enhancement is accomplished by adaptive non-linear grey scale transformation depending on the result of objective quality m
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| 15. |
- Koch, S, et al.
(författare)
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IT-based evaluation and automatic improvement of the quality of intraoral radiographs
- 1995
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Ingår i: COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE. - : ELSEVIER SCI PUBL IRELAND LTD. - 0169-2607. ; 46:1, s. 41-50
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Tidskriftsartikel (refereegranskat)abstract
- The quality of intraoral radiographs made in dental practices is too often not adequate for diagnostic purposes. This necessitates standardized measures for the quality of intraoral radiographs and controlled techniques for automatic image improvement. Fo
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| 16. |
- Persson, T, et al.
(författare)
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A marker-free method to estimate joint centre of rotation by video image processing
- 1995
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Ingår i: Computer Methods and Programs in Biomedicine. - 0169-2607. ; 46:3, s. 217-224
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Tidskriftsartikel (refereegranskat)abstract
- A marker-free video measurement and image processing method that provides numerical estimation of the 2-D centre of rotation of one rigid segment is tested. The algorithm is based on binary region moment features. A comparison is made between this method
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| 17. |
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| 18. |
- Seipel, S, et al.
(författare)
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Oral implant treatment planning in a virtual reality environment
- 1998
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Ingår i: COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE. - : ELSEVIER SCI IRELAND LTD. - 0169-2607. ; 57:1-2, s. 95-103
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Tidskriftsartikel (refereegranskat)abstract
- A system for three-dimensional oral implant treatment planning is presented. Virtual reality technologies are used in order to improve the human image interpretation and planning performance. The methods described are based on computer tomography (CT) dat
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| 19. |
- Wade, V, et al.
(författare)
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Managing the operation of open distributed laboratory information systems
- 1996
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Ingår i: COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE. - : ELSEVIER SCI IRELAND LTD. - 0169-2607. ; 50:2, s. 123-133
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This paper examines how the concepts and designs of workflow management systems and distributed systems management can be integrated and customised to manage open laboratory computing services, The paper outlines the objectives of managing laboratory comp
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| 20. |
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