Device for measuring radiation absorption or radiation emission distributions in a plane through a body
AssigneeU.S. Philips Corporation
InventorWolfgang Wagner
Life of this patent
Estimating the term…
Abstract
For measuring the absorption from measuring values whereby the radiation attenuation in a plane of a body is measured, a large number of calculations must be performed. When use is made of a digital computer, a large quantity of storage locations and a long calculating time are required. According to the invention, use is made of a charge storage tube wherein the correction values calculated in a preprocessing unit on the basis of the measuring values are superimposed, so that a substantial reduction of the calculation time and a reduction of the number of storage locations are realized.
Claims8
A device for measuring the spatial distribution of the absorption or emission of radiation in a plane of a body, comprising:
- means for measuring the absorption or emission of the body in a large number of directions all situated in the plane, the measurements forming a multiplicity of measuring series, each measuring series comprising a multiplicity of measuring values measured along approximately parallel straight lines, the lines of different series being oriented in different directions;
- a preprocessing unit for calculating a correction value corresponding to each measuring value from the measuring values of the same series in accordance with a predetermined function,
- a cathode-ray tube device having a charge storage target area for superposing correction values, the target area being scanned in parallel strips corresponding in position and direction with the straight lines of the measuring values, the amount of charge added or taken away from each strip being determined by the correction value of the corresponding measuring value;
- and
- a control section for controlling the preprocessing unit and the cathode-ray tube device such that while the cathode-ray tube scans a strip corresponding to a measuring value, the preprocessing unit calculates the correction value corresponding to the next measuring value.
Dependencies are inferred from the claim text.