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M Preisack

Publications and source records attributed to M Preisack.

4 recordsLinked to original sources
PubMed2005

[Simplified production of multimedia based radiological learning objects using the flash format].

PURPOSE: Evaluation of the applicability of the Flash Format for the production of radiological learning objects used in an e-learning environment. MATERIAL AND METHODS: Five exemplary learning objects with different didactic purposes referring to radiological diagnostics are presented. They have been intended for the use within the multimedia, internet-based e-learning environment LaMedica. Interactive learning objects were composed using the Flash 5.0 software (Macromedia, San Francisco, USA) on the basis of digital CT and MR images, digitized conventional radiographs and different graphical elements prepared as TIFF files or in a vector graphics format. RESULTS: After a short phase of initial skill adaptation training, a radiologist author was soon able to create independently all learning objects. The import of different types of images and graphical elements was carried out without complications. Despite manifold design options, handling of the program is easy due to clear arrangement and structure, thus enabling the creation of simple as well as complex learning objects that provided a high degree of attractiveness and interaction. Data volume and bandwidth demand for online use was significantly reduced by the Flash Format compression without a substantial loss of visual quality. CONCLUSION: The universally compatible Flash Format offers an opportunity for the simple production of radiological learning objects that fulfill all relevant needs of modern internet based e-learning environments, such as interactivity, employment of multimedia and convertibility.

Computer Graphics↗
PubMed2000

CardioOp: an integrated approach to teleteaching in cardiac surgery.

INTRODUCTION/PURPOSE: The complexity of cardiac surgery requires continuous training, education and information addressing different individuals: physicians (cardiac surgeons, residents, anaesthesiologists, cardiologists), medical students, perfusionists and patients. Efficacy and efficiency of education and training will likely be improved by the use of multimedia information systems. Nevertheless, computer-based education is facing some serious disadvantages: 1) multimedia productions require tremendous financial and time resources; 2) the obtained multimedia data are only usable for one specific target user group in one specific instructional context; 3) computer based learning programs often show deficiencies in the support of individual learning styles and in providing individual information adjusted to the learner's individual needs. In this paper we describe a computer-system, providing multiple re-use of multimedia-data in different instructional sceneries and providing flexible composition of content to different target user groups. TOOLS AND METHODS: The ZYX document model has been developed, allowing the modelling and flexible on-the-fly composition of multimedia fragments. It has been implemented as a DataBlade module into the object-relational database system Informix Dynamic Server and allows for presentation-neutral storage of multimedia content from the application domain, delivery and presentation of multimedia material, content based retrieval, re-use and composition of multimedia material for different instructional settings. Multimedia data stored in the repository, that can be processed and authored in terms of our identified needs is created by using a next generation authoring environment called CardioOP-Wizard. High-quality intra-operative video is recorded using a video-robot. Difficult surgical procedures are visualized with generic and CT-based 3D-animations. RESULTS: An on-line architecture for multiple re-use and flexible composition of media data has been established. The system contains the following instructional applications (prototypically implemented): a multimedia textbook on operative techniques, an interactive module for problem based-training, a module for creation and presentation of lectures and a module for patient information. Principles of cognitive psychology and knowledge management have been employed in the program. These instructional applications provide information ranging from basic knowledge at the beginner's level, procedural knowledge for the advanced level to implicit knowledge for the professional level. For media-annotation with meta-data a metainformation system, the CardioOP-Clas has been developed. The prototype focuses on aortocoronary bypass grafting and heart transplantation. CONCLUSION: The demonstrated system reflects an integrated approach in terms of information technology and teaching by means of multiple re-use and composition of stored media-items to the individual user and the chosen educational setting on different instructional levels.

Computer Simulation↗
PubMed1993

First clinical experience with low molecular weight heparin LU 47311 (reviparin) for prevention of restenosis after percutaneous transluminal coronary angioplasty.

Restenosis after successful percutaneous transluminal coronary angioplasty (PTCA) remains a major problem limiting the clinical efficacy of the procedure. It has been shown that SMC proliferation plays a predominant role in this accelerated atherosclerotic process. In vitro and in vivo experiments with the LMWH reviparin (LU 47311) suggest a pronounced inhibitory effect of this compound on SMC proliferation. To evaluate the safety of reviparin and the incidence of angiographic restenosis in humans a study with increasing dosages was conducted in 41 patients. Repeat coronary angiography was performed 3 months after angioplasty. Restenosis occurred in 5 of 37 evaluable patients (14%) with initially successful PTCA. No major bleeding complication was documented for any of the patients included in this trial. Thus, in this limited series, administration of LU 47311 (reviparin) resulted in a low incidence of restenosis following PTCA without causing major bleeding complications. A randomized trial in a larger population is warranted to define the real impact of this compound for reduction of restenosis in patients who underwent successful balloon angioplasty.

Adult↗