JPWO2020025779A5 - - Google Patents

Claims (17)

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:
for controlling the X-ray source, the X-ray detector, the adjustment means and the translation and rotation means to operate the device in different operating modes with different distances between the X-ray source and the X-ray detector; a control unit of
connected to the control unit to prevent interference between the x-ray source and/or the x-ray detector and the patient while the x-ray source and/or the x-ray detector are moving; and interference detection means for detecting possibilities. 2. Apparatus according to claim 1, wherein the control unit brings both the X-ray source and the X-ray detector closer together to change the distance between the X-ray source and the X-ray detector. . In order to change the distance between the X-ray source and the X-ray detector, the control unit moves only the X-ray detector toward the X-ray source fixed to the rotating arm. A device according to claim 1 . 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 one of claims 1 to 5, 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. The apparatus is positioned between the X-ray source and the patient, and in an alternative mode of operation in which the distance between the X-ray source and the X-ray detector is reduced, the apparatus is opened wider than in the basic mode of operation. 9. A device according to any one of the preceding claims, characterized in that it comprises a primary collimator with a . Radiant intensity and/or exposure time of said X-ray source are selected according to a selected distance between said X-ray source and said X-ray detector in a selected mode of operation. 10. Apparatus according to any one of claims 1-9. The radiation intensity of the x-ray source is adjusted to a selected distance between the x-ray source and the x-ray detector by adjusting the x-ray generating current and/or voltage of the x-ray source. or
The radiant intensity of the X-ray source is reduced to a previous value between the X-ray source and the X-ray detector in the current operating mode relative to the distance between the X-ray source and the X-ray detector in the previous operating mode. is adjusted from the previous value to the current value by multiplying the square of the ratio of the distances between
11. A device as claimed in any one of claims 1 to 10, adjusted by either or both. 2. The exposure time of the X-ray detector is shortened when the device is operated in an operating mode in which the distance between the X-ray source and the X-ray detector is reduced. 12. Apparatus according to any one of claims 1-11. 13. Apparatus according to any one of the preceding claims, characterized in that the magnification factor is constant in the various operating modes. The device comprises:
A basic mode of operation for large patients and an alternative for small patients in which the distance between the X-ray source and the X-ray detector is reduced compared to the distance used in the basic mode of operation. and optionally, said primary mode of operation is an adult mode of operation and said alternate mode of operation is a children's mode of operation;
comprising at least one X-ray detector for both panoramic and computed tomography of the patient's head region;
14. Apparatus according to any one of the preceding claims, wherein the apparatus is one or both. 15. Any one of claims 1 to 14, 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. The apparatus described in . interference detection means for detecting the possibility that said X-ray source interferes with said X-ray source and/or said patient or patient positioning means while said X-ray source is moving; interference detection means for detecting the possibility of a ray detector interfering with said x-ray detector and said patient or said patient positioning means or both while said x-ray detector is moving; or 16. A device as claimed in any preceding claim, comprising both interference detection means. 17. Apparatus according to claim 16, wherein said interference detection means is selected from the group comprising capacitive distance sensors, ultrasonic distance sensors, optical distance sensors and ToF optical sensors.