Search PubMed⌕ Search

Biomedical subjects

V Miszalok

Publications and source records attributed to V Miszalok.

9 recordsLinked to original sources
PubMed1987

[Video-angiography: methods and nomenclature].

This paper is a report from the First Symposium on Video Fluorescein Angiography, held on November 29, 1985, at the Charlottenburg Eye Clinic of the Free University of Berlin. Following a discussion among the working groups from Aachen, Tübingen, and Berlin, N. Körber (Cologne), V. Miszalok (Berlin), F. Jung (Homburg), and S. Wolf (Aachen) propose a new, uniform set of definitions relating to time and velocity measurable with video techniques.

Fluorescein Angiography↗
PubMed1986

Myocardial perfusion defects in contrast echocardiography: spatial and temporal localisation.

The position and size of experimental myocardial perfusion defects can be detected by using the echocardiographic contrast-medium Echoson together with digital image processing techniques. Video tapes showing the important sequences before, during and after cardial inflow of echo-enhancing agents are fed in total length into a digital image processing unit. The myocardial circumferences are then chosen interactively. All the frames are analysed and a synthetic picture is compiled, and shows the myocardial echo densities in a single, highly condensed form. Digital subtraction of blank values (condensed sequences before injection of contrast medium) greatly improves readability. Further concentration of the remaining information yields the following diagrams: flow/circumferential position (time summation); flow/time (position summation), which contain the desired information on homogeneity or defects of echo density against time and myocardial position.

Animals↗
PubMed1986

[NMR-tomography of the human eye].

The NMR relaxation data of tissue are the basis of an appropriate adjustment of NMR imaging parameters. The relaxation data of ocular tissues are presented, and the relaxation behaviour of the eye is discussed. NMR imaging of eyes with intraocular silicone and pseudophakia are shown. Up to the present time, neuritis of the optic nerve is not detectable by NMR tomography whereas intraocular melanoma are clearly distinguishable.

Eye↗
PubMed1986

Contrast echography of the eye and orbit.

SH U 454 is a new echocontrast agent which was developed primarily for echocardiography. It seems that there is a further potential in ophthalmic ultrasound diagnostics. SH U 454 produces contrast enhancement in the orbit, choroid and ciliary body, and permits determination of intraocular blood flow parameters in dogs' eyes. The effects are measured with digital picture processing techniques.

Animals↗
PubMed1986

Quantification of myocardial perfusion by contrast echocardiography.

Two-dimensional echocardiography allows identification of myocardial perfusion defects due to coronary artery occlusion by detection of regional wall motion abnormalities and absence of myocardial echocontrast enhancement after injection of echocontrast agents into the aortic root. In the current study twelve anesthetized closed chest dogs were examined before and after balloon occlusion of a coronary vessel. Size of perfusion defects was determined morphologically by Evans blue staining, while the circumferential extent of regional wall motion abnormality was calculated using radial wall motion analysis of the two-dimensional echocardiogram. Four mL of SH U 454 were injected into the aortic root for echocontrast studies. Perfusion defects in the echocardiogram were determined planimetrically in the analog two-dimensional echocardiographic image. In addition, perfusion defects in the contrast echocardiogram were estimated by a digital image processing technique along a circumferential mid-wall line. Along this line the time-intensity curves of the myocardial echocontrast were also calculated. There was a linear correlation between morphological determination of perfusion defects and their planimetric estimate in the contrast echocardiogram. The linear regression equation was y = 0.98x + 4.63, r = 0.92, and the standard error of estimate for the echocardiographic examination was SEE = 4.4%. Digital image processing did not increase accuracy in determining the size of perfusion defects (r = 0.88; y = 1.01x + 3.33; SEE = 5.7%). By comparing the extent of regional wall motion abnormalities with the size of anatomic perfusion defects there was a correlation of r = 0.85; SEE = 6.2%; y = 0.71x + 10.50.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1985

Quantitative monitoring of fundus changes.

The proposed method allows to discover and quantify small changes in series of fundus photographs which are normally not directly comparable. The principle of geometric conformality of small parts between the fundus and its photographs is developed into a practical method of stereoscopic measurement, numerical adjustment and quantitative evaluation. Very high accuracy is possible without special conditions on repeated fundus photography. The aim is to create a theoretical and methodical basis for ophthalmoscopic change detection with image-processing computers.

Fundus Oculi↗