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Biomedical subjects

G Witte

Publications and source records attributed to G Witte.

47 records · Page 3Linked to original sources
PubMed1983

[Digital subtraction angiography (DSA) in acute pulmonary embolism].

The results of 49 DSAs (in 29 patients) are presented; these were performed for the diagnosis or follow-up of pulmonary emboli. The direct or indirect signs of pulmonary emboli, known to occur during conventional pulmonary angiography, were used as diagnostic criteria. In 47 examinations it was possible to make or to exclude the diagnosis unequivocally. The advantages of DSA make it desirable to use this method as the first form of examination in the diagnosis of acute, but not immediately life-threatening, pulmonary emboli.

Adult↗
PubMed1983

Digital venous subtraction angiography of pulmonary embolism in dogs.

Digital venous subtraction angiography makes it possible to obtain satisfactory images of the pulmonary vessels and thus to evaluate changes in the segmental and subsegmental arteries caused by pulmonary embolism. Morphologic as well as functional images can be produced in the course of a single examination. Semi-quantitative information about the vessels under examination as compared with the corresponding contralateral vessels is thus achieved. This procedure is valuable both in primary diagnosis and in subsequent repeat examinations after treatment.

Angiography↗
PubMed1983

[Left-side changes in thoracic follow-up studies after heart surgery].

In routine thoracic x-ray follow-ups after cardiosurgical procedures, 93.2% of our patients (n = 88) showed radiologically perceivable pathological changes, reduced ventilation being the most common phenomenon. 77.1% the the patients showed signs of reduced ventilation, mostly the left side. Limited motility of the diaphragm on the left side was visible in 69% of the cases studied. The defective motility of the left diaphragm is attributable to direct damage to the left nervus phrenicus caused by extracardial heart cooling during surgery.

Cardiac Surgical Procedures↗
PubMed1980

Streptococcus zooepidemicus (group C) pneumonia in a human.

Lancefield group C streptococcal pneumonia appeared in a previously healthy young adult. The patient apparently acquired the infection while caring for her sick horse, and experienced a gradual onset of the illness. There was rapid accumulation of pleural fluid and empyema requiring open drainage. Group C pneumonia cannot be distinguished from classic group A pneumonia on clinical grounds. Beta-hemolytic streptococci isolated from sputum, transtracheal aspirates, pleural fluid, or blood of patients with pneumonia should be grouped by the precipitin method of Lancefield or one of its more rapid modifications.

Adult↗
PubMed1980

[Functional imaging of characteristic kinetic parameters of kidney and thyroid (author's transl)].

A procedure has been developed by which the reaction of an organ to a very short delta-function activity pulse of an organ-specific tracer introduced into the blood can be determined for the kidney and the thyroid. The data for the procedure are available from sequence scintigrams and the change with time of the activity of the tracer in the blood. The nature and duration of this reponse function makes it possible to calculate organ-specific parameters such as uptake rates, clearance rates or transit times. They may be calculated for the total field of the gamma camera and delineated as grey or colour gradations to yield the respective parametric functional images. The apparatus necessary for the procedure is described and its possible clinical application in comparison to conventional scintigraphic procedure is discussed.

Humans↗
PubMedDate not supplied

Data compression in digital angiography using the Fourier transform.

While digital techniques in radiology develop rapidly, problems arise with archival storage and communication of image data. This paper reports on experiments concerning data reduction of digital image sequences of the heart and the brain. The time-intensity curves corresponding to every picture element are subjected to the Fourier transform and reconstructed from a number of coefficients smaller than the original number of images. The reconstruction error is assessed by visual inspection and by determining the mean-square deviation of the original and the reconstructed curve. It is shown that compression factors between 5 and 10 may be achieved without loss of diagnostic information. It is furthermore demonstrated that storage of the images in the form of Fourier coefficients leads to advantages in fast retrieval, enhancement of morphology, and possibility of further quantitative analysis.

Cerebral Angiography↗