Siemens Aktiengesellschaft

Karl-Hans Reiss

Gerhard Kuhn

Klaus Killig

Karl Ubler

In the illustrated embodiments radiant energy at a plurality of distinct energy levels (each above 150 keV) is directed along one or more primary beam paths, and a series of detectors are arranged to receive scatter radiation from the same or successive points irradiated by the primary beam energy, with the detectors either collecting scatter energy over identical solid angles and at identical mean scattering angles or having their respective outputs equalized to a common scattering sample for each respective scatter energy spectrum. By relatively shifting a group of detectors a linear or layer region can be scanned, and the respective outputs from each detector can be individually recorded for subsequent processing to eliminate the effects of multiple scattering and unequal mean scattering angles. With detectors stationary, a time series of respective output signals from each detector can be recorded to facilitate the study of local ventilation of defined zones in the lungs, for example. By suitable processing, the output signals can be converted to numerical density readings and/or an accurate graphical display of density variations in a region of medical interest.

Method for determining the density of bodies by means of penetrating

An ionography chamber with spherically curved electrodes, in which an electrically insulating sheet is located between the spherically curved electrodes and covers one of these electrodes. The covered electrode has an uneven shape near its edge, and a gas is admitted into a space between the sheet and the other electrode. The uneveness of one of the electrodes is in the form of a groove running along the edge of the electrode, or a rib attached along the edge of the electrode. A pressure difference is generated for the purpose of pressing the sheet against the electrode with the uneven shape. The pressure difference causes the sheet to be tightly bonded to the respective electrode.

Ionographic chamber

In a radiographic system a converter is used for changing image forming intensity distribution in a bundle of penetrating rays into a flow of electrically charged particles by electrodes located in a gas space and partly latticed (grids) which lie at potentials stepped from cathode to anode. The invention is particularly characterized by the provision of at least two grids extending between and parallel to the cathode and the anode. The electrical field which lies between two electrodes lies at least between the grids located closest to the cathode being to the extent of between 1 and 10%, in the average preferably 3% below the electrical break down field in the gas in a homogenous electrical field.

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Erlangen, Germany

Karl-Hans Reiss