Computer Quantitation Of Angiocardiographic Images

P. H. Heintzen; R. Brennecke; J. H. Buersch

doi:10.1117/12.956974

19 June 1979 Computer Quantitation Of Angiocardiographic Images

P. H. Heintzen, R. Brennecke, J. H. Buersch

Author Affiliations +

Proceedings Volume 0167, Noninvasive Cardiovascular Measurements; (1979) https://doi.org/10.1117/12.956974
Event: Noninvasive Cardiovascular Measurements, 1978, Palo Alto, United States

Abstract

Conventional angiocardiography is classified as an "invasive" method, since the contrast material is injected selectively via catheters into the central circulation. This provides maximum contrast with minimum superposition. The resulting angiocardiograms represent the single-, bi- or multiplane x-ray projection of the instantaneous spatial dye distribution, frame by frame. The new technique of computerized video-angiocardiography to be described minimizes the disadvantages of contrast material and provides the maximum structural and/or functional information from angiocardiograms for a given amount of contrast independent of the site and mode of injection. Even with 1/5 to 1/10 of the normally used amount of contrast material and peripheral injection, the con-tracting heart and the vessels can be clearly visualized. This improvement is reached by summing up instantaneous contrast angiocardiographic pictures in a continuous or heart phase related mode, and subtracting the corresponding non-specific background obtained from x-ray pictures taken in real time prior to or following contrast injection. Maximum flexibility of the "gated" integration and subtraction angiocardiography is facilitated by digitizing complete videoangiocardiograms, each field in real time, and by storing it into the mass memory of a digital computer for further image processing. Digital filtering and histogram modification techniques are used to enhance the contrast, and to reduce the "noise." Our technique as presently used and some typical results will be demonstrated. If this computerized angiocardiography is performed in its "invasive" version, higher contrast and improved border recognition can be achieved with even less dye and circulatory disturbances. Quantitative videoangiocardiographic techniques for volume, flow, and contraction pattern analysis can be facilitated by the described modes of digital image preprocessing.

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P. H. Heintzen, R. Brennecke, and J. H. Buersch "Computer Quantitation Of Angiocardiographic Images", Proc. SPIE 0167, Noninvasive Cardiovascular Measurements, (19 June 1979); https://doi.org/10.1117/12.956974

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