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European Heart Journal 1985 6(11):913-920;
Copyright © 1985 by the European Society of Cardiology.
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© 1985 The European Society of Cardiology

First clinical results with digital flashing tomosynthesis in coronary angiography

P. HAAKER*, E. KLOTZ*, R. KOPPE*, R. LINDE* and D. G. MATHEY

*Philips GbmH Forschungslaboratorium Hamburg Vogt-Keolln-Str. 30 D-2000 Hamburg 54, F.R.G
{dagger}Department of Cardiology, University Hospital Eppendorf Martinistrasse 53, D-2000 Hamburg 20, F.R.G

revised 17 July 1985; .

Address for correspondence: E. Klotz, c/o Philips GmbH Forschungs-Uboratorium Hamburg, Vogt-fCoelln-Str. 30, D-2000 Hamburg 54, f.R.G.

Abstract

Digital flashing tomosynthesis (D-FTS) investigations have been performed using a new nonlinear reconstruction algorithm. It is called extreme-value decoding and produces significantly less artefact than back projection used commonly in tomosynthesis. The reduction of artefact allows the use of tomosynthesis based on only four projections in the case of dilute objects, i.e. objects with only a small number of high absorbing voxels. This condition can be realized in angiography by cancelling soft-tissue and bones by subtraction (e.g. DSA technique).

The new technique has been carried out in 10 patients with coronary artery disease after investigation with standard 35 mm cineangiography. For the recording step of the D-FTS images we have used a multiple X-ray source. For the digital nonlinear reconstruction step we have used a VAX 11/780 computer. The estimated degree of stenosis found by D-FTS tomograms shows good accordance with the cineangiographic studies. The amount of contrast medium, the X-ray dose, and the investigation time are significantly reduced, because D-FTS requires only a single pre- and post-injection multiple perspective-image for each coronary artery.

Key Words: Tomosynthesis • 35mm cineangiography • digital subtraction angiography • image processing


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