Showing papers by "Gerhard Sagerer published in 1983"

Model Based Analysis of Scintigraphic Image Sequences of the Human Heart

Abstract: A system for the automatic analysis of scintigraphic image sequences of the human heart is described in this paper. The aim of the system is the automatic detection of motion abnormalities. The system has a modular structure consisting of four components, namely ‘Methods’, ‘Model’, ‘Instances’, and ‘Control’. The Module ‘Methods’ comprises several routines for image preprocessing and segmentation. The knowledge needed for analyzing an image sequence is contained in the module ‘Model’. The model is represented by means of a semantic network. Instances of model concepts are kept separately from the model. Each instance has the same structure as its corresponding concept. The ‘Control’ module has two principal concerns. First, it provides some means for communication between user and system. Secondly, it controls the analysis of an image sequence based on the model creating instances of model concepts.

A System for Diagnostic Evaluation of Scintigraphic Image Sequences

Abstract: Due to its noninvasive nature, nuclear imaging has become very important for the diagnosis of human heart diseases. In our research, we are concerned with scintigrams, i. e. images showing the radiation emitted by the blood pool after equal distribution of a radionuclide which has been injected into a peripheral vein of the patient. The two-dimensional intensity distribution on an image corresponds to the three-dimensional radiation distribution of the blood pool. In this way, the interior space of the heart, i.e. the heart cavities are visualized. For assessing the motility of the heart, a sequence of images triggered by ECG is taken, representing one cycle of the heart. Besides diagnosis, periodical supervision after heart surgeries is a major application of the analysis of scintigraphic image sequences.