X-ray examination apparatus and method
First Claim
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1. An X-ray examination apparatus, comprising:
- an X-ray source for generating X-rays;
X-ray detecting means for detecting X-rays after penetration through an object of interest providing a detector dose signal accurately indicating the X-ray dose;
X-ray dose sensing means for measuring the current X-ray dose of the X-rays penetrating the object of interest providing a sensor dose signal indicating the current X-ray dose; and
control means for controlling said X-ray source by a control signal being adapted for generating said control signal by correcting said sensor dose signal, said control means comprising storage means for storing a number of values of the last measured sensor dose signal and correcting means for generating a correction signal for correcting the sensor dose signal, said correction signal being generated from the current value of said detector dose signal and the stored value of the sensor dose signal measured at essentially the same time as said value of said detector dose signal.
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Abstract
The invention relates to an X-ray examination apparatus and a corresponding method. To provide a fast and accurate control of the X-ray dose combining a fast and inaccurate sensor dose signal from an X-ray sensor and a slow and accurate detector dose signal (I) from an X-ray detector taking into account the delay between said two signals, an X-ray examination apparatus is proposed comprising:
- an X-ray source (1) for generating X-rays,
- an X-ray detecting means (2, 6) for detecting X-rays after penetration through an object of interest (3) providing a detector dose signal (I) accurately indicating the X-ray dose,
- an X-ray dose sensing means (5) for measuring the current X-ray dose of the X-rays penetrating the object of interest (3) providing a sensor dose signal (S) indicating the current X-ray dose,
- control means (7-13) for controlling said X-ray source (1) by a control signal (C) being adapted for generating said control signal (C) by correcting said sensor dose signal (S), said control means comprising: a storage means for storing a number of values of the last measured sensor dose signal, and a correcting means for generating a correction signal for correcting the sensor dose signal, said correction signal being generated from the current value of said detector dose signal and the stored value of the sensor dose signal measured at essentially the same time as said value of said detector dose signal.
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Citations
9 Claims
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1. An X-ray examination apparatus, comprising:
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an X-ray source for generating X-rays;
X-ray detecting means for detecting X-rays after penetration through an object of interest providing a detector dose signal accurately indicating the X-ray dose;
X-ray dose sensing means for measuring the current X-ray dose of the X-rays penetrating the object of interest providing a sensor dose signal indicating the current X-ray dose; and
control means for controlling said X-ray source by a control signal being adapted for generating said control signal by correcting said sensor dose signal, said control means comprising storage means for storing a number of values of the last measured sensor dose signal and correcting means for generating a correction signal for correcting the sensor dose signal, said correction signal being generated from the current value of said detector dose signal and the stored value of the sensor dose signal measured at essentially the same time as said value of said detector dose signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An X-ray examination method,
wherein X-rays generated by an X-ray source are detected by an X-ray detecting means after penetrating through an object of interest, said X-ray detecting means providing a detector dose signal accurately indicating the X-ray dose, wherein the current X-ray dose of the X-rays penetrating the object of interest are measured by an X-ray dose sensing means providing a sensor dose signal indicating the current X-ray dose, and wherein a control signal for controlling said X-ray source is generated by control means by correcting said sensor dose signal, wherein a number of values of the last measured sensor dose signal are stored in storage means, and a correction signal for correcting the sensor dose signal is generated by correcting means from the current value of said detector dose signal and the stored value of the sensor dose signal measured at essentially the same time as said value of said detector dose signal.
Specification