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Biomedical subjects

P Jensch

Publications and source records attributed to P Jensch.

At least 19 recordsLinked to original sources
PubMed1988

[Three-dimensional imaging in ultrasonic diagnosis. Initial results].

A new method of three-dimensional (3-D) reconstruction of 2-D ultrasound images of the kidney is described. It is based on a coordinated spatial reconstruction of sequential cross-sectional images. The ultrasound head is moved longitudinally between two rails (parallel sections) and rotated. With a suitable computer program and contouring of each cross-section (so that the organ limits are defined for the computer) these cross-sectional pictures can be reconstructed into 3-D organ images. The kidney can then be presented spatially either as a binary picture or with closed surface. Ultrasound investigators are still unaccustomed to colour reproduction of 3-D reconstructed organs. It remains to be seen whether the method is valuable in routine clinical use.

Color↗
PubMed1978

[Computer system for the automatic analysis of cath-lab data. Reliability of pattern-recognition and measurements (author's transl)].

The computer-system for the on-line-analysis of hemodynamic data developed in Aachen enables the clinical user to perform the immediate on-line analysis of ECG, pressure-curves and thermo- or dye-dilution-curves in a dialog mode. The procedure of pressure analysis as well as the calculations by the computer for the individual haemodynamic parameters are described. The comparison of the medical-manual evaluation of the pressure curves on paper-registration and the computer results of the same measurement shows a very good correlation for wave-recognitions and wave-measurements for this system, integrated in the daily routine since 24 months. As well in the application of various fluid-filled catheters used in praxis as in tip-manometers it could be proved for the pressure-analysis in the different positions of the heart, that the computer-system produced reliable evaluations for all catheter materials used. The flexible conception of the computer program with its fast adaption to new problems allows its use not only in the clinical routine, but also and especially in the handling of scientific questions in the frame-work of haemodynamic analysis.

Cardiac Catheterization↗
PubMed1977

[Detailed analysis of systolic and diastolic parameters in aortic valve disease (author's transl)].

The on-line computer-system for the analysis of cathlab data developed by us allows the immediate evaluation of the conventional pressure- and valve-opening as well as a new hemodynamic parameters. In addition the volume-analysis is performed by the videometry-program. In simultaneous pressure-volume-registrations the complementary calculation of important energetic items is possible. This expanded analysis by the aid of the computer-system enables a detailed pre- and postoperative study of great clinical-practical and scientific importance.

Aortic Valve↗
PubMed1976

[Data processing system for laboratory and hemodynamic heart catheterization measurements].

In cooperation with the Department of Electronic Data Processing Systems we have developed a data processing unit for the analysis of hemodynamic data at the Department of Internal Medicine I. The aim was to design a computer-system for the daily routine in heart-catheterizations as well as for the solution of scientific problems during hemodynamic studies. In the on-line-mode besides the ECG up to four pressures can be analysed simultaneously. Analog and digital tapes can also be processed off-line on demand. The concept of the whole system and the individual steps of computer-handling are adjusted to the problems of data-analysis in praxis from the viewpoint of the examining cardiologist. Since the system is interactive after each measurement and each given command the computer-results are displayed on the video-scope. Because of the modular structure of the program new medical criteria can easily be implemented at any time. Since the computer-system is not effectively used with only one cath-lab other units possibly of different hard-ware configuration can be connected simultaneously to the computer. Each cath-lab shares 16 K out of the total 32 K core-memory. The results are displayed graphically and alpha-numerically on video-scope, x-y-plotter and line printer. The sampling-rate for fluid-filled catheters is 200 Hz and for catheter-tip-manometers 400 Hz. Smothing and differentiation-procedures are adapted to the respective catheter-material. The computer-program calibrates the different pressure amplifiers automatically. After defining the catheter-position the pressure-signals are sampled for 10 s and immediately afterwards analyzed by the computer. The ECG and the corresponding pressure-curves are displayed on the video-scope. The automatically selected representative beat as well as each of the identified and numerated other beats of the sampling-phase can be displayed selectively together with its numerical results. The computer marks the positions within the pressure-curves, where the individual measurements were taken. Besides the systolic and diastolic pressures in valvular stenosis the maximal and mean systolic or diastolic gradients, ejection- or filling-period, valve-flow and valve-area are calculated autonomously. The calculation of cardiac-output, different volume-indices and stroke-work-index are based on Fick-method, thermo- or indicator-dilution technique. The contractility-parameters max dp/dt, t-max dp/dt, max dp/dt/DP, max dp/dt/P, VPM, V40, min dp/dt and the stiffness are computed for the left and on demand also for the right ventricle. Data of the patient and the operating-team, catheter-technique, complications and free comments are transmitted to the computer via terminal together with the actual time. The computer-system was drafted for permanent use. Therefore possible technical defects have been anticipated in the design of hard- and soft-ware. In cases of failure suitable steps allow the immediate restart of the system without loosing information...

Angiocardiography↗