Device for determining the radiation absorption distribution...

Details Device for determining the radiation absorption distribution... Device for determining the radiation absorption distribution...

H - Electricity

05

G

358/11.1

H05G 1/00 (2006.01) A61B 6/03 (2006.01) G06T 11/00 (2006.01)

Patent

CA 1126416

26.3.79 1 PHD.78-033 "ABSTRACT": "Device for determining the radiation absorption distribution in a plane of examination". In computer tomography apparatus the radiation intensity of the radiation source remains constant during a measuring operation. This means that in those positions in which the absorption of the radiation through the patient is particularly weak, the patient gets an un- necessarily large dose without any useful effect, as only a distinct number of X-ray quanta is required for a given measuring accuracy. It is an object of the invention to measure the radiation absorption distribution at a reduced dose but without the measuring accuracy being affected. The radiation intensity of the radiation source in a measuring position is made dependent on the mean measuring error of the adjacent measuring position; the mean measuring error does then indeed not remain constant but it fluctuates less than when a constant intensity of the radiation source is used.

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