X-ray computed tomography apparatus having marks for geometrical image correlation
AssigneeSiemens Aktiengesellschaft
InventorsKarl Wiesent, Guenter Schwierz
Life of this patent
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Abstract
In an x-ray computed tomography apparatus with low radiation exposure to the patient, marks are additionally imaged during scanning of the patient, by which the geometry of the image can be determined. The marks are arranged above and/or below a region of interest in the measurement field on rings and are imaged by the x-ray beam.
Claims15
In an x-ray computed tomography apparatus having an x-ray source which emits an x-ray beam that penetrates an examination subject in a measurement field and which produces an x-ray image on a radiation detector while the x-ray source and the radiation detector are rotated around said examination subject, said measurement field including a region of interest, the x-ray detector converting the x-ray image into electrical signals, and means for generating an image of said examination subject from said electrical signals, the improvement comprising:
- a plurality of marks, separate from said examination subject, respectively producing mark images which are present in said x-ray image;
- and
- means for annularly arranging said marks relative to said examination subject above said region of interest in said measurement field.
In an x-ray computed tomography apparatus having an x-ray source which emits an x-ray beam that penetrates an examination subject in a measurement field and which produces an x-ray image on a radiation detector while the x-ray source and the radiation detector are rotated around said examination subject, said measurement field including a region of interest, the x-ray detector converting the x-ray image into electrical signals, and means for generating an image of said examination subject from said electrical signals, the improvement comprising:
- a plurality of marks, separate from said examination subject, respectively producing mark images which are present in said x-ray image;
- and
- means for annularly arranging said marks relative to said examination subject below said region of interest in said measurement field.
In an x-ray computed tomography apparatus having an x-ray source which emits an x-ray beam that penetrates an examination subject in a measurement field and which produces an x-ray image on a radiation detector while the x-ray source and the radiation detector are rotated around said examination subject, said measurement field including a region of interest, the x-ray detector converting the x-ray image into electrical signals and means for generating an image of said examination subject from said electrical signals, the improvement comprising:
- a plurality of marks, separate from said examination subject, respectively producing mark images which are present in said x-ray image;
- and
- means for annularly arranging said marks related to said examination subject above and below said region of interest in said measurement field.
Dependencies are inferred from the claim text.