Short term tomosynthesis

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The short-term tomosynthesis is a tomographic process for the representation of body slices that has not made it to the market.

With tomosynthesis, all information required for tomography of an object is obtained in one process without moving the X-ray tube, the film and the object. A number of X-ray tubes are flashed at the same time. This results in shadow images that are superimposed and recorded on the same film. This is the first step in creating a “coded” image. In a second step, the coded image is decoded in an image reconstruction and the desired layer is created using a simple optical process. It was developed in the Würzburg University Hospital.

The short-term tomosynthesis consists of two steps, a recording step and a reconstruction step. In the former, the three-dimensional object O (a part of the patient's body) is imaged through an area of ​​X-ray tubes in the form of a coded image O '. The X-ray tubes are arranged non-redundantly, so that as little "noise" as possible occurs. In the second step, this coded image O 'is post-processed so that any desired layers of the object can be reconstructed. The reconstruction is carried out using a matrix of lenses. The lenses are arranged in the same way as the X-ray tubes when recording. The coded image O 'is multiplied (x-fold) as often as X-ray tubes are used and the individual images are shifted relative to one another according to the coordinates of the X-ray focal spots and the whole is added up. The result is an x-fold overlay of the image O 'in a reconstruction space. This multiple projection creates a real image O ″ of the object. If you now enter the reconstruction volume with a screen, exactly the corresponding tomogram is cut out of the object. This gives the possibility of continuously walking through the object. In this way, any desired layers of the object can be decoded in a continuous manner by continuously changing the scale.

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  • J. Haendle, H. Sklebitz: The electronic layer image, Röntgenpraxis 34, 1981;
  • H. Weiss, E. Klotz, R. Linde: Kurzzeittomosynthese, from "Our research in Germany", Volume III, Philips GmbH Research Laboratory Aachen, 1980;
  • E. Klotz, R. Linde, U. Tiemens et all: Kurzzeittomosynthese, Philips technical Rundschau, issue 11/12, year 38, 1979;
  • M. Nadjmi, H. Weiss, E. Klotz, R. Linde: J. Haendle, H. Sklebitz: Kurzzeit-Tomosynthese - clinical experiences, Röntgenpraxis 34, 1981