Browsing by Author "Frankewitsch, Thomas"
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- ItemThe Clinical Document Architecture (CDA) enables electronic medical records to wireless mobile computing.(2004-09-13) Müller, Marcel; Frankewitsch, Thomas; Ganslandt, Thomas; Bürkle, Thomas; Prokosch, Hans-UlrichThe Clinical Document Architecture CDA has proved to be a valuable and powerful standard for a structured exchange of clinical documents between heterogeneous software systems like a Hospital Information System and a Physician Office System In this paper we want to show how the CDA can additionally be used in order to enhance the Hospital Information System s functionality each patient related document contained in or generated from the HIS can be converted to a CDA XML document With the XML XSLT based transformation methods those documents can be device specifically transformed We use this method to display HIS content on mobile devices like Personal Digital Assistants PDAs by extracting the respective data fields from the HIS database converting them to a CDA XML document which is transformed and sent to the mobile devices using a wireless intranet connection Preliminary results and users comments are promising but further evaluation will be necessary Our approach shows a generic model how clinical data can be dis played on different devices independently from the underlying HIS using CDA
- ItemComputed Quality Assessment of MPEG4-compressed DICOM Video Data.(2005-09-14) Frankewitsch, Thomas; Söhnlein, Sven; Müller, Marcel; Prokosch, Hans-UlrichDigital Imaging and Communication in Medicine DICOM has become one of the most popular standards in medicine This standard specifies the exact procedures in which digital images are exchanged between devices either using a network or storage medium Sources for images vary therefore there exist definitions for the exchange for CR CT NMR angiography sonography and so on With its spreading with the increasing amount of sources included data volume is increasing too This affects storage and traffic While for long time storage data compression is generally not accepted at the moment there are many situations where data compression is possible Telemedicine for educational purposes e g students at home using low speed internet connections presentations with standard resolution video projectors or even the supply on wards combined receiving written findings DICOM comprises compression for still image there is JPEG for video MPEG 2 is adopted Within the last years MPEG 2 has been evolved to MPEG 4 which squeezes data even better but the risk of significant errors increases too Within the last years effects of compression have been analyzed for entertainment movies but these are not comparable to videos of physical examinations e g echocardiography In medical videos an individual image plays a more important role Erroneous single images affect total quality even more Additionally the effect of compression can not be generalized from one test series to all videos The result depends strongly on the source Some investigations have been presented where different MPEG 4 algorithms compressed videos have been compared and rated manually But they describe only the results in an elected testbed In this paper some methods derived from video rating are presented and discussed for an automatically created quality control for the compression of medical videos primary stored in DICOM containers