Filter method for an x-ray system, and device for carrying out such a filter method
First Claim
1. A filter method for an X-ray system, comprising an X-ray source for emitting X-ray quanta and a detector device which supplies at least one measurement signal in order to detect the X-ray quanta having interacted with an object in an examination zone, which method comprises the following steps:
- a) a measurement during which a filter is arranged in the beam path between the X-ray source and the examination zone,b) a measurement during which a filter consisting of the same material as the filter used during the other measurement is arranged in the beam path between the examination zone and the detector device,c) subtractive combination of the measurement signals obtained from the two measurements.
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Abstract
A filter method and device for carrying out the method in conjunction with an X-ray system having a beam path for primary radiation between an X-ray source and an examination zone and a beam path for scattered radiation between the examination zone and a detector device, involve subtractive combination of first and second measurement signals produced by the detector device in response to scattered radiation received in first and second filter arrangements. For production of the first measurement signal a filter is arranged in the beam path for primary radiation and not in the beam path for scattered radiation, while for production of the second measurement signal a filter is arranged in the beam path for scattered radiation and not in the beam path for primary radiation. The latter filter consists of the same material as the filter used for the first measurement, and may be the same filter.
92 Citations
10 Claims
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1. A filter method for an X-ray system, comprising an X-ray source for emitting X-ray quanta and a detector device which supplies at least one measurement signal in order to detect the X-ray quanta having interacted with an object in an examination zone, which method comprises the following steps:
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a) a measurement during which a filter is arranged in the beam path between the X-ray source and the examination zone, b) a measurement during which a filter consisting of the same material as the filter used during the other measurement is arranged in the beam path between the examination zone and the detector device, c) subtractive combination of the measurement signals obtained from the two measurements. - View Dependent Claims (2, 3, 4, 5)
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6. An X-ray system comprising:
- an examination zone;
an X-ray source for irradiating the examination zone via a beam path for primary radiation;
a detector device for detecting radiation exiting the examination zone via a beam path for scattered radiation;
filter means selectively arrangeable for filtering radiation either in the beam path for primary radiation or in the beam path for scattered radiation; and
means for subtractive combination of first and second measurement signals formed by the detector device at different times. - View Dependent Claims (7, 8, 9, 10)
- an examination zone;
Specification