0000000000033489
AUTHOR
W. Clas
TALISMAN: Eine Softwareumgebung für die interaktive Verarbeitung medizinischer Bildserien
Fur die kardiologische Diagnostik eroffnen sich durch die interaktive Auswertung digitalisierter Bildserien zahlreiche neue Moglichkeiten. Die entstehenden Hardware- und Softwaresystem sind interaktiv zu erproben und unterliegen einer schnellen Entwicklung und Veranderung der Algorithmen und der Benutzeroberflachen. Die TALISMAN- Softwareumgebung erleichtert diese Vorgange durch folgende Eigenschaften: 1. Unterstutzung eines modularen Aufbaus der Anwendungsprogramme durch Bereitstellung eines Botschaftensystems (vgl. objektorientierte Umgebungen wie z. B. Smalltalk). 2. Standardisierung der Struktur der bildverarbeitenden Programm-Module (z.B. Daten-struktur und visuelle Darstellung der Bot…
Color superposition: a new modality for contrast echocardiography.
To improve the estimation of endocardial borders in echocardiography, a technique has been developed to combine images from contrasted and noncontrasted echocardiograms of the same heart-phase using a color superposition mode. This method allows both experienced as well as less experienced examiners to define the endocardial borders more reproducibly and objectively. This is achieved by displaying tissue structures as gray level images while the ventricular cavity is marked selectively by the color display of the contrast material zone. Results of volume estimations of the left ventricle by different examiners using several imaging modes including color superposition display are presented.
Reliability and Accuracy of Echocardiography for Follow-up Studies after Intervention
By two-dimensional echocardiography limitations of M-mode echocardiography have been eliminated. As a direct and noninvasive method two-dimensional echocardiography seems to be an ideal method for analysis of left ventricular function in follow-up studies. In relation to other methods there are no limitations concerning x-ray exposure, physicians and patients safety. Before different studies can be discussed, reliability and accuracy of two-dimensional echocardiography have to be evaluated. Beat-to-beat, day-to-day, intra- and interobserver variability will be discussed, followed by description of follow-up studies after intervention.
New balloon catheter for prolonged percutaneous transluminal coronary angioplasty and bypass flow in occluded vessels.
A new balloon catheter was developed for continuous perfusion of coronary arteries during angioplasty (CPC catheter). Steerable Gruntzig balloon catheters (3.7 mm) with two lumina were formed. The first lumen was used for balloon inflation. Side holes to the second lumen proximally and distally to the balloon were created for coronary perfusion even during inflation phase. At a perfusion pressure of 120 mmHg, a flow rate of 63 +/- 3 ml/min with 0.9% saline and 43 +/- 1 ml/min with plasma expander were measured. In experiments on five dogs, dilation time until appearance of signs of ischemia could be prolonged in three of five dogs from 30 to 40 s, 120 to 203 s, and 180 to 420 s comparing co…