DUAL SPECTRUM X-RAY TUBE WITH SWITCHED FOCAL SPOTS AND FILTER
First Claim
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1. Examination apparatus (100) for dual spectrum examination of an object of interest (107), the examination apparatus (100) comprising:
- a filter unit (204) adapted for filtering a radiation beam from the object of interest (107), the radiation beam having a focal spot;
a fast focal spot switching unit adapted for switching the focal spot from a first focal spot location to a second focal spot location;
a detector unit (108) adapted for acquiring measurement data on the basis of the radiation beam from the object of interest (107);
wherein the filter unit (204), the first and the second focal spot location are arranged in such a way, thatthe radiation beam passes through the filter unit (204) when the focal spot is in the first location, resulting in filtered first spectral measurement data,and that the radiation beam does not pass through the filter unit (204) when the focal spot is in the second location, resulting in second spectral measurement data.
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Abstract
In three-dimensional computed tomography or three-dimensional rotational X-ray imaging, the acquisition of different spectral measurement data requires subsequent acquisition runs. According to an exemplary embodiment of the present invention, an examination apparatus is provided in which different spectral measurement data are acquired immediately one after another during the same acquisition run by performing a focal spot switching during data acquisition. This may reduce motion artefacts.
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Citations
17 Claims
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1. Examination apparatus (100) for dual spectrum examination of an object of interest (107), the examination apparatus (100) comprising:
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a filter unit (204) adapted for filtering a radiation beam from the object of interest (107), the radiation beam having a focal spot; a fast focal spot switching unit adapted for switching the focal spot from a first focal spot location to a second focal spot location; a detector unit (108) adapted for acquiring measurement data on the basis of the radiation beam from the object of interest (107); wherein the filter unit (204), the first and the second focal spot location are arranged in such a way, that the radiation beam passes through the filter unit (204) when the focal spot is in the first location, resulting in filtered first spectral measurement data, and that the radiation beam does not pass through the filter unit (204) when the focal spot is in the second location, resulting in second spectral measurement data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An image processing device for examination of an object of interest (107), the image processing device comprising:
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a memory for storing a data set of the object of interest (107), the data set comprising filtered first spectral measurement data corresponding to a first focal spot location and non-filtered second spectral measurement data corresponding to a second focal spot location, both data acquired immediately one after another during the same acquisition run; a reconstruction unit (118) adapted for; determining a difference between the first spectral measurement data and the second spectral measurement data; and reconstructing an image of the object of interest (107) on the basis of the difference. - View Dependent Claims (13)
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14. A method of examination of an object of interest (107) with an examination apparatus, method comprising the steps of:
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detecting filtered first radiation having a focal spot at a first focal spot location, resulting in filtered first spectral measurement data; switching the focal spot from the first focal spot location the a second focal spot location; detecting second radiation having a focal spot at the second focal spot location immediately after detection of the filtered first radiation during the same acquisition run, resulting in second spectral measurement data. - View Dependent Claims (15)
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16. A computer-readable medium (402), in which a computer program of examination of an object of interest is stored which, when being executed by a processor (401), is adapted to carry out the steps of:
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detecting filtered first radiation having a focal spot at a first focal spot location, resulting in filtered first spectral measurement data; switching the focal spot from the first focal spot location the a second focal spot location; detecting second radiation having a focal spot at the second focal spot location immediately after detection of the filtered first radiation during the same acquisition run, resulting in second spectral measurement data.
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17. A program element of examination of an object of interest, which, when being executed by a processor (401), is adapted to carry out the steps of:
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detecting filtered first radiation having a focal spot at a first focal spot location, resulting in filtered first spectral measurement data; switching the focal spot from the first focal spot location the a second focal spot location; detecting second radiation having a focal spot at the second focal spot location immediately after detection of the filtered first radiation during the same acquisition run, resulting in second spectral measurement data.
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Specification