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US 5,210,782 AGranted
Method and apparatus for split radiography
AssigneeN.V. Optische Industrie "De Oude Delft"
InventorsRonald J. Geluk, Hugo Vlasbloem
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AssigneeN.V. Optische Industrie "De Oude Delft"
InventorsRonald J. Geluk, Hugo Vlasbloem
Estimating the term…
In an equalization radiography device an X-ray fan beam (3,4) is used to scan a body (7) under examination. The X-ray fan beam comprises a number of adjacent sectors. A modulator device (5) comprising a number of controllable beam sector modulators is present for controlling per sector the quantity of X-ray radiation transmitted. A detector (11) placed behind the body generates per sector a measurement signal representing a desired position of the beam sector modulator for that sector. During operation the instantaneous position of each beam sector modulator is continuously detected (20,21). Signals representing those positions are generated and compared with the respective measurement signals. Control signals are derived from the comparisons to control the positions of the respective beam sector modulators.
Method for slit radiography in which, with the aid of an X-ray source and a slit-type diaphragm placed in front of the X-ray source, a fan-type X-ray beam is formed, with which beam a body under examination is scanned at least partially in a direction transverse to the longitudinal direction of the slit of the slit-type diaphragm in order to form an X-ray shadow image on an X-ray detector placed behind the body, which fan-type X-ray beam is formed by a multiplicity of sectors situated adjacently to one another, the transmitted X-ray radiation being influenced instantaneously during the scanning movement per sector of the fan-type beam, while in operation, by means of controllable beam sector modulators interacting with the slit diaphragm, the quantity of radiation transmitted through the body being measured with the aid of detection means instantaneously per sector of the X-ray beam during the scanning movement and the measurement result being used to control the beam sector modulators, characterized in that, during operation, the instantaneous position of each beam sector modulator is continuously detected, in that an electrical signal representing the instantaneous position is generated for each beam sector modulator, in that the electrical signal representing the instantaneous position is compared with the measurement result provided by the detection means and associated with the respective beam sector, and in that a control signal for the respective beam sector modulator is formed from the measurement result and the signal representing the instantaneous position.
Slit radiography apparatus comprising an X-ray source which is able to scan, at least partially, via a slit of a slit diaphragm a body under examination with a fan-type beam in a direction transverse to the longitudinal direction of the slit in order to form an X-ray shadow image on an X-ray detector, beam sector modulators interacting with the slit diaphragm which, during operation, are able to influence the fan-type beam instantaneously per sector during the scanning movement in order to be able to regulate the X-ray radiation incident in each sector on the body under examination, and detection means which are designed to detect, during a scanning movement of the X-ray beam, the quantity of X-ray radiation transmitted through the body instantaneously per sector and to convert it into corresponding signals, which apparatus is characterized by means which, during operation, are able to detect the instantaneous position of each beam sector modulator and are able to provide electrical signals corresponding to the detected positions, and by means which are able to form control signals for the beam sector modulators from the said electrical signals and the signals provided by the detection means for the quantity of radiation transmitted through a body.
Dependencies are inferred from the claim text.