BRIEF DESCRIPTION OF DRAWING
The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself however may be best understood by reference to the following detailed description of the invention, which describes certain exemplary embodiments of the invention, taken in conjunction with the accompanying drawings in which:
FIG. 1 shows a block diagram of a controllable X-ray machine for irradiating a narrowed portion according to the present invention.
FIG. 2 shows an explanatory diagrams illustrating a narrowed irradiation of an X-ray generator.
FIGS. 3A and 3B show a relationship between a digital visible-light image and an X-ray image.
FIG. 4 shows a flowchart of a method for controlling an X-ray generator to irradiate a narrowed portion.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a block diagram of the controllable X-ray machine 100 for irradiating a narrowed portion according to the present invention. The controllable X-ray machine 100 includes a controllable X-ray generator 110, a digital camera 120 and a control unit 130. The X-ray generator 110 and the digital camera 120 are electrically connected to the control unit 130. The X-ray generator 110 is a cold cathode field emission device essentially including a plurality of coupling anodes and cathodes. As shown in FIG. 2, each cathode 111 aligns a corresponding anode 112 and can be controlled individually. Each of the cathodes 111 individually emits e-beams to the corresponding anode 112 when an electric field is applied between a couple of a specific anode 112 and cathode 111. Then the anodes 112 which are collided by the e-beams from the cathodes 111 will emit X-rays 113 outward. A maximum irradiation range 114 of the X-ray generator 110 will exist while all of the anodes 112 are emitting X-rays. Further, the irradiation range can be adjusted to a narrowed object portion 115 within the maximum irradiation range 114 by controlling the anodes 112 and/or cathodes 111.
Referring to FIG. 3, the digital camera 120 has a specific position relationship with the X-ray generator 110 such that the image-shooting area of the digital camera 120 is unvaryingly the same as the maximum irradiation range 114 of the X-ray generator 110. When the controllable X-ray machine 100 is used, the digital camera 120 first takes a digital visible-light image 120a for the object to be irradiated. The digital visible-light image 120a will be substantially the same as what the maximum irradiation range 114 covers. The digital visible-light image 120a is sent to the control unit 130. When the control unit 130 receives the digital visible-light image 120a, the control unit 130 can be configured to select a narrowed image portion 115a within the digital visible-light image 120a automatically or manually. The control unit 130 then generates control signals corresponding to the selected image portion 115a and sends the control signals including position data related to the selected image portion 115a to the X-ray generator 110. Afterward, the cathodes 111 and/or the anodes 112 of the X-ray generator 110 are controlled by the control signals to drive the X-ray generator 110 to irradiate the selected object portion 115 within the maximum irradiation range 114. The selected object portion 115 is corresponding to the selected image portion 115a. As shown in FIG. 2, the actual X-ray emitting range on the X-ray generator 110 will be narrower than the selected object portion 115 within the maximum irradiation range 114 due to fan-shaped radiation of X-rays. The control unit 130 can calculate a required emitting range on the X-ray generator 110 according to the distance between the X-ray generator 110 and the object, and the sectorial angle of X-ray radiation.
As mentionedabove, the operation of selecting a narrowed image portion 115a within the digital visible-light image 120a by the control unit 130 is automatically or manually. In the manual operation mode, a user can preview the digital visible-light image 120a shot by the digital camera 120 and selects a narrowed image portion 115a within the digital visible-light image 120a, then the narrowed object portion 115 corresponding to the selected image portion 115a will be irradiated by X-rays emitted from the X-ray generator 110. The control unit 130 will generate corresponding control signals according to the relative position between the selected image portion 115a and the digital image 120a. The X-ray generator 110 emits X-ray only to irradiate the selected portion 115 after receiving the control signals and under the control thereof. Therefore a narrowed X-ray image as shown in FIG. 3B can be produced. In the automatic operation mode, a user can set the control unit 130 to automatically detect a specific portion of the object in the digital visible-light image 120a such as a face or breast. The X-ray generator 110 will be automatically controlled to irradiate the detected portion.
Moreover, the present invention also provides a method for controlling an X-ray machine to irradiate a narrowed object portion. The method comprises following steps:
A controllable X-ray generator 110 is first provided in step S1. As mentionedabove, the controllable X-ray generator 110 is a cold cathode field emission device comprising a plurality of coupling anodes 112 and cathodes 111, and each of the cathodes 111 and anodes 112 can be controlled individually, and a maximum irradiation range 114 exists when all of the anodes 112 emit X-rays;
A digital visible-light image 120a is then generated in step S2, wherein the shooting area of the digital visible-light image 120a is the same as the maximum irradiation range 114 of the controllable X-ray generator 110.
After the digital visible-light image 120a is generated, a specific narrowed image portion 115a within the digital visible-light image 120a is selected in step S3 and control signals corresponding to the selected image portion 115a is generated in step S4.
Finally, the controllable X-ray generator 110 emits X-rays to a selected object portion 115 within the maximum irradiation range 114. The selected objected portion 115 is corresponding to the selected image portion 115a within the digital visible-light image 120a under the control of the control signals in step S5.
Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.
Patent Application
20080019480
