Y Lehareinger

Publications (5)3.88 Total impact

• Article: High-definition true-colour television for use in minimally invasive medical procedures.

  A von Orelli, Y Lehareinger, P Rol, P Niederer, D Doswald, N Felber
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  ABSTRACT: Endoscopes are key elements in the application of minimally invasive medical procedures. Thereby, image quality, ease of application and safety are of decisive importance for the user. This communication is primarily concerned with aspects relating to image quality. Standard television technology is presently used in endoscopes for image presentation purposes. It is however shown, that the inherent optical quality of most endoscopes exceeds the performance of standard TV. Accordingly, a special purpose advanced digital television system exhibiting true colour performance has been developed. Since endoscopic images usually are circular, its aspect ratio is quadratic with a spatial resolution of 1000 x 1000 pixels. It has furthermore a temporal resolution of 1 to 30 Hz noninterlaced and a contrast resolution of 56.6 dB. The design and performance of the system is documented.
  Technology and health care: official journal of the European Society for Engineering and Medicine 02/1999; 7(1):75-84.
• Conference Proceeding: Alarm Optimizing by Fuzzy Logic in Preterm Infants Monitoring.

  D. Schenk, M. Wolf, H.-U. Bucher, Y. Lehareinger, P. Niederer
  Computational Intelligence, Theory and Applications, International Conference, 5th Fuzzy Days, Dortmund, Germany, April 28-30, 1997, Proceedings; 01/1997
• Article: Improved monitoring of preterm infants by Fuzzy Logic.

  M Wolf, M Keel, K von Siebenthal, H U Bucher, K Geering, Y Lehareinger, P Niederer
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  ABSTRACT: Keeping the oxygenation status of newborn infants within physiologic limits is a crucial task in intensive care. For this purpose several vital parameters are supervised routinely by monitors, such as electrocardiograph, transcutaneous partial oxygen pressure monitor and pulse oximeter. Each monitor issues an alarm signal whenever an upper or lower limit of the parameter(s) measured is exceeded. However, in practice it turns out, that a considerable amount of false alarms is generated by artefacts, which are attributed mostly to movements of the infants. Eliminating these false alarms would be of benefit to the staff as well as the patients of the intensive care unit. Accordingly, an automated system based on Fuzzy Logic was developed, which is capable of distinguishing between critical situations and artefacts. The system is based on a Transputer IMS T425 in a PC, which collects the data from the monitors, plots it on a colour screen, saves it to hard disk and analyses it by Fuzzy Logic. Fuzzy algorithms were developed to generate more reliable alarms. All vital parameters of eight infants, who either moved often and/or frequently produced real alarm situations, were recorded. Synchronously the infants' movements and care procedures were video taped. The data and video were analysed off line with the help of an experienced neonatologist. His judgement was compared to the analysis of the Fuzzy Logic system. The results show that it is possible to improve the reliability of the monitored data with the aid of an evaluation strategy based on Fuzzy Logic and hence distinguish between real alarm situations and movement artefacts to the extent that an application in an intensive care unit under routine conditions becomes conceivable.
  Technology and health care: official journal of the European Society for Engineering and Medicine 09/1996; 4(2):193-201.
• Article: Data recording and playback on video tape--a multi-channel analog interface for a digital audio processor system.

  M Blaettler, A Bruegger, I C Forster, Y Lehareinger
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  ABSTRACT: The design of an analog interface to a digital audio signal processor (DASP)-video cassette recorder (VCR) system is described. The complete system represents a low-cost alternative to both FM instrumentation tape recorders and multi-channel chart recorders. The interface or DASP input-output unit described in this paper enables the recording and playback of up to 12 analog channels with a maximum of 12 bit resolution and a bandwidth of 2 kHz per channel. Internal control and timing in the recording component of the interface is performed using ROMs which can be reprogrammed to suit different analog-to-digital converter hardware. Improvement in the bandwidth specifications is possible by connecting channels in parallel. A parallel 16 bit data output port is provided for direct transfer of the digitized data to a computer.
  Journal of Neuroscience Methods 04/1988; 23(2):139-48. · 1.98 Impact Factor
• Article: Semi-automatic reconstruction of the spatial trajectory of an impacted pedestrian surrogate using high-speed cinephotogrammetry and digital image analysis.

  F Mesqui, P Niederer, M Schlumpf, Y Lehareinger, J Walton
  Journal of Biomechanical Engineering 12/1984; 106(4):357-9. · 1.90 Impact Factor