JPWO2020025778A5 - - Google Patents

Claims (18)

A device for digital imaging of the head region of a patient, comprising:
an X-ray source for X-ray irradiation;
an x-ray detector for detecting x-rays produced by the x-ray source and passing through the patient;
A rotary arm carrying said X-ray source and said X-ray detector, arranging them to face each other, and comprising adjustment means for changing the distance between said X-ray source and said X-ray detector. When,
a support structure for supporting said rotating arm, wherein motorized translation and rotation means are interposed between said rotating arm and said support structure,
The device comprises:
at least one X-ray detector for both panoramic and computed tomography of the patient's head region;
It controls the X-ray source, the X-ray detector, the adjustment means and the translation and rotation means and provides a basic operating mode for large patients and a distance between the X-ray source and the X-ray detector. and a control unit adapted to operate the device in alternative modes of operation for small patients that are reduced compared to the distance used in the primary mode of operation. Device for digital imaging of partial regions. 2. The apparatus of claim 1, wherein the control unit brings both the x-ray source and the x-ray detector closer together for alternate modes of operation. 2. The apparatus of claim 1, wherein the control unit moves only the X-ray detector towards the X-ray source fixed to the rotating arm for alternate modes of operation. 4. The apparatus of claim 3, wherein the control unit further moves the axis of rotation of the rotating arm toward the x-ray detector. 5. Apparatus according to claim 4, for computer tomography, wherein the axis of rotation is displaced on a trajectory around a virtual axis of rotation located on the object to be imaged. 6. Apparatus according to any preceding claim, wherein the X-ray detector moves within a housing that is fixed with respect to the rotating arm. 7. Apparatus according to any one of the preceding claims, wherein said adjusting means comprises means for positioning said X-ray detector selected from the group comprising:
a mechanism comprising means for lateral movement with respect to the longitudinal axis of said rotating arm;
a mechanism comprising means for pivoting movement with respect to said rotating arm;
a cross-link mechanism for changing the distance between a base attached to the rotating arm and a support structure of the X-ray detector;
a linear movement mechanism for moving said X-ray detector along a guide structure towards an X-ray source, and combinations thereof. 8. Apparatus according to any one of claims 1 to 7, characterized in that said adjustment means are motor driven. 9. The apparatus according to any one of claims 1 to 8, characterized in that the apparatus comprises a primary collimator positioned between the X-ray source and the patient, the primary collimator being more open in the alternative operating mode than in the basic operating mode. A device according to any one of the preceding claims. 1-1, characterized in that the radiant intensity of the X-ray source and/or the exposure time of the X-ray detector is reduced in the alternative operating mode compared to the basic operating mode. 10. Apparatus according to any one of 9. 13. The radiant intensity of the X-ray source is reduced in the alternative mode of operation by reducing the X-ray generating current and/or voltage of the X-ray source. 11. Apparatus according to any one of clause 10. The radiation intensity of the X-ray source is the distance between the X-ray source and the X-ray detector in the alternate mode of operation relative to the distance between the X-ray source and the X-ray detector in the primary mode of operation. 12. Device according to any one of the preceding claims, characterized in that it is reduced by the square of the ratio of the distances between. 13. Apparatus according to any one of the preceding claims, wherein the exposure time of the X-ray detector is shorter in the alternative mode of operation than in the basic mode of operation. 14. Apparatus according to any one of the preceding claims, wherein the magnification factor is the same for the alternative mode of operation and the basic mode of operation. 15. Apparatus according to any one of the preceding claims, wherein the primary operating mode is an adult operating mode and the alternative operating mode is a child operating mode. 16. A method according to any one of the preceding claims, characterized in that the distance between the X-ray source and the X-ray detector is adjusted according to results of detection means for determining physical parameters of the patient. device. said X-ray source comprises interference detection means for detecting possible interference with said X-ray source and said patient or patient positioning means or both while said X-ray source is moving; or interference detection for detecting possible interference of the x-ray detector with the patient and/or positioning means for the patient while the x-ray detector is moving; 17. A device according to any one of the preceding claims, characterized in that it comprises interference detection means, and/or interference detection means. 18. Apparatus according to claim 17, wherein said interference detection means is selected from the group comprising capacitive distance sensors, ultrasonic distance sensors, optical distance sensors and ToF optical sensors.