Radioscopic image device
AssigneeN.V. Optische Industrie "De Oude Delft"
InventorSipko L. Boersma
Life of this patent
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Abstract
A radioscopic image former comprises a slit between an X-ray source and a subject to produce an X-ray fan beam to scan the subject. The transmission of the slit is adjusted locally during the scanning depending on local absorptions in the subject. The X-ray fan beam is cyclically modulated. The local modulation frequency depends on the coordinate in the longitudinal direction of the slit. The slit comprises a number of tongues each tongue being excited at or near its resonant frequency. Each tongue has its own frequency or phase and acts as a frequency-selective element.
Claims5
An apparatus for slit radiography, which comprises:
- an X-ray source;
- an X-ray detector for sensing radiation pasing through a body to be radiographed;
- a slit diaphragm positioned between said X-ray source and said body for forming a substantially planar X-ray beam;
- a plurality of attenuating elements positioned along said slit diaphragm forming corresponding number of attenuating sections;
- means to move said elements within said X-ray beam;
- means for scanning said body with said planar X-ray beam;
- detection means co-operating with said X-ray detector and being responsive to radiation sensed by said X-ray detector to prodice an electric signal representative of intensity of the sensed radiation;
- and
- means for controlling said means to move said attenuating elements during scanning of said body in response to said electric signal, such that the movement of each attenuating element modulates for each corresponding section, the intensity of X-ray radiation at a certain temporal frequency, wherein each attenuating element moves in response to a different frequency or phase than all other attenuating elements.
Dependencies are inferred from the claim text.