Method and arrangement for detecting X-rays
First Claim
1. In a method for detecting X-rays where individual energy ranges are simultaneously radiated onto an object to be X-rayed and are thereby weakened and the weakened X-ray beams are separated into a low-energy range and a high-energy range by passing the weakened X-rays through sequentially arranged first low-energy range and high-energy range detectors to provide respective low-energy and high-energy signals, the improvement comprising:
- providing a further low-energy signal (FX2) that also represents the low-energy range of the weakened X-ray beam (FX′
) from a second low energy detector; and
using the further low-energy signal to compute the high-energy shares absorbed in the low energy range out of the low-energy signal (FX1) provided by the first low-energy range detector to provide an improved low-energy range signal.
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Abstract
A method for detecting X-rays which are separated into individual energy ranges after penetrating an object, as well as to an arrangement for implementing this method. It is known to detect X-rays (FX) by using detection devices (3), consisting of several identically configured detector pairs. The detector pairs in that case consist of a low-energy detector (4) and a high-energy detector (7). As a result, the weakened X-ray beam (FX′) is separated into individual energy ranges following the X-raying of an object (2). This separation is necessary to determine the types of material in the X-rayed object (2). The disadvantage of known detection devices (3) is that an overlapping of the individual energy ranges occurs in the low-energy detector (4), thereby making it impossible to detect the material type with certainty. This problem is avoided by providing for computing out the high-energy shares absorbed in the low-energy detector (4) with the aid of an additional signal. For this purpose, a second low-energy detector (5) is arranged between the first low-energy detector (4) and the high-energy detector (7). An energy spectrum (FX2) that is absorbed in the second low-energy detector (5) is used to obtain the signal to be subtracted.
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10 Claims
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1. In a method for detecting X-rays where individual energy ranges are simultaneously radiated onto an object to be X-rayed and are thereby weakened and the weakened X-ray beams are separated into a low-energy range and a high-energy range by passing the weakened X-rays through sequentially arranged first low-energy range and high-energy range detectors to provide respective low-energy and high-energy signals, the improvement comprising:
- providing a further low-energy signal (FX2) that also represents the low-energy range of the weakened X-ray beam (FX′
) from a second low energy detector; and
using the further low-energy signal to compute the high-energy shares absorbed in the low energy range out of the low-energy signal (FX1) provided by the first low-energy range detector to provide an improved low-energy range signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- providing a further low-energy signal (FX2) that also represents the low-energy range of the weakened X-ray beam (FX′
Specification