Biomedical subjects

T Grunert

Publications and source records attributed to T Grunert.

6 recordsLinked to original sources

PubMed1997

Three-dimensional endosonography of the pelvic floor: an additional diagnostic tool in surgery for continence problems in children.

Three-dimensional endorectal sonography with a specially developed system is able to produce an image of the entire pelvic floor including the sphincter muscles and the rectal wall even in small children. This special system is based on conventional endorectal ultrasound and allows recording of a controlled withdrawal of the axially rotating transducer, creating an image sequence resembling that of a spiral CT-scan; this sequence is digitized off-line and evaluated in a three-dimensional form by a workstation computer. This evaluation has several advantages compared with conventional examination, for example, the complete recording of organs with the possibility of volumetry, construction of arbitrary sections, volume-rendering procedures and the interactive segmentation of organ borders and their three-dimensional visualization. Based on images from this 3D endorectal sonography, the normal anatomy of the pelvic floor that is visible using ultrasound is described, followed by some pathological findings concerning continence surgery. Finally we discuss the advantages and restrictions compared to other examination procedures and the possibilities of technical development.

Child↗

PubMed1997

[Endosonographic determination of the volume of anal sphincter muscles as a parameter for continence outcome in childhood].

The volumes of the external and internal anal-sphincter muscles, determined by three-dimensional (3d) endosonography, are linear to each other and to the body-height and body-surface ratios in normal children. In patients with an operation of the sphincter muscles, the reduced volume of the external sphincter system permits a differentiation of incontinent children; the volume of the internal sphincter muscles, however, doesn't give a significant difference nor does the muscle-thickness. An acceptable estimation of the sphincter muscles volume can be made with conventional endosonography by planimetry of the muscle tissue in four representative axial cut-planes and by measuring of the sphincter-length.

Adolescent↗

PubMed1996

A model for storage and retrieval of theoretical medical knowledge.

A database model for structure and access of theoretical medical knowledge is presented. The basic principle is the organization of knowledge in three dimensions: Each topic--first dimension--is explained with media--second dimension--in different versions of varying details--third dimension--suitable for different users. Every topic is one database entry. Topics are interconnected with heading and sub-topics (tree structure) and to logically related topics (cross references). Access follows the 3D-concept with initial access by topic, by media, or user specific, and with intra-unit access to related topics, media, and user specific versions. The model is discussed and possible implementations are described.

Computer-Assisted Instruction↗

PubMed1991

[Real time eye tracking--principles and quantification].

Tracking and quantification of eye movements in real time is a prerequisite for future computer assisted laser positioning for diagnostic or therapeutic purposes. Principles of TV-image processing are described: tracking of contrasts and pattern recognition tracking by object correlation; their relevance for tracking retinal targets is illustrated using authentic video material. For practical use, the pattern recognition technique qualifies better. The influence of the systems variable parameters on retinal target pursuence is described. Automatic target pursuence of authentic eye movements reached tracking success rates well above 90% thus outperforming manual tracking by one order of magnitude.

Computer Graphics↗

PubMedDate not supplied

Imaging and graphics in medicine: concept of an object-oriented platform for clinical research.

We present a workstation-based research platform with two major components. A turnkey application system provides a functionality kernel for a broad community of clinical users with an interest in digital imaging. A development toolbox allows efficient implementation of research ideas and consistent integration of new applications with the common framework of the turnkey system. The platform is based on an elaborate object class structure describing objects for image processing, computer graphics, study handling and user interface control. Thus expertise of computer scientists familiar with this application domain is brought into the hospital and can be readily used by clinical researchers.

Computer Graphics↗

PubMedDate not supplied

Medical workstations for applied imaging and graphics research.

We present a medical workstation for the efficient implementation of research ideas related to image processing and computer graphics. Based on standard hardware platforms the software system encompasses two major components: A turnkey application system provides a functionally kernel for a broad community of clinical users working with digital imaging devices, including methods of noise suppression, interactive and automatic segmentation, 3D surface reconstruction and multi-modal registration. A development toolbox allows new algorithms and applications to be efficiently implemented and consistently integrated with the common framework of the turnkey system. The platform is based on an elaborate object class structure describing objects for image processing, computer graphics, study handling and user interface control. Thus expertise of computer scientists familiar with this application domain is brought into the hospital and can be readily used by clinical researchers.

Algorithms↗