A shielding sheet structure for an arc-shaped beam limiter
A technology of beam limiter and shielding sheet, which is applied in the direction of diaphragm for radiation diagnosis, computerized tomography scanner, echo tomography, etc. It can solve the problem of being unable to judge the limit position of the opening of the beam limiter, and achieve precise control of X-ray exposure , the effect of reducing damage
Active Publication Date: 2015-12-30
SAINUO WEISHENG SCI & TECH BEIJING
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[0005] The purpose of the present invention is to provide a shielding sheet structure for an arc-shaped beam limiter, which solves the problem that the arc-shaped beam limiter cannot judge the limit position of the opening of the beam limiter, and has a great effect on further accurately controlling the X-ray exposure. help
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[0021] see Figure 5 to Figure 9 Shown: an arc-shaped beam limiter block structure, which includes two arc-shaped tungsten plates 4, in the reference channels 7 at both ends of the detector in the two ends of the two arc-shaped tungsten plates 4, respectively A small tungsten sheet 6 is provided, and four small tungsten sheets 6 are connected to the two ends of the two arc-shaped tungsten plates 4. The lower end of the small tungsten sheet 6 is an arc centered on the focus of the X light source. The arc-shaped outer diameter A of the sheet 6 is larger than the arc-shaped outer diameter B of the arc-shaped tungsten plate 4; thus, the area irradiated by X-rays on the reference channel will be smaller than that of other channels. In turn, it can be used to judge whether the opening of the beam limiter has reached the limit.
[0022] The arc-shaped outer diameter of the small tungsten sheet 6 is 10-16 mm larger than the arc-shaped outer diameter of the arc-shaped tungsten plate 4...
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The invention relates to a structure of a shielding piece for an arc-shaped beam-limiting device. The structure of the shielding piece for the arc-shaped beam-limiting device comprises two arc-shaped tungsten plates, wherein a small tungsten piece is respectively arranged in reference channels at the two ends of each detector in the two ends of each of the two arc-shaped tungsten plates, the lower end of each small tungsten piece is a circular arc with the focal point of an X light source as the center, and the circular external diameter of each small tungsten piece is larger than the circular external diameter of each arc-shaped tungsten plate; the circular external diameter of each small tungsten piece is 10-16mm larger than the circular external diameter of each arc-shaped tungsten plate; a small tungsten piece support is respectively arranged in the reference channels at the two ends of each detector of each arc-shaped tungsten plate, the upper end of each small tungsten piece support is connected with the lower end of corresponding arc-shaped tungsten plate, and the outer end of each small tungsten piece support is connected with corresponding small tungsten piece. The structure of the shielding piece for the arc-shaped beam-limiting device has the beneficial effects that benefits of the arc-shaped beam-limiting device in a CT system are fully utilized, and the problem that a limiting position of an opening of the arc-shaped beam-limiting device can not be judged is solved, so that great help is provided for further accurately controlling exposure of X ray, and harm of unnecessary X ray to a human body is reduced.
Description
technical field [0001] The invention relates to the technical field of CT machines, and belongs to a shielding plate structure of an arc-shaped beam limiter. Background technique [0002] At present, there are beam limiters on medical CT machines. Its main function is to limit the rays emitted from the X-ray source so that they only pass through the parts and organs that need to be scanned, so as to reduce the dose received by the patient as much as possible. Its implementation method is as figure 1 As shown, two independently moving tungsten plates are placed in parallel, the gap between the two parallel sides is the place where X-rays pass through, while other places will be blocked by the tungsten plates. For different scanning requirements, the size of the gap can be adjusted by the relative movement of the two tungsten plates. [0003] There are two shapes of tungsten plate: one is flat tungsten plate 1 (see figure 1 ); the other is an arc-shaped tungsten plate 4 cen...
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IPC IPC(8): A61B6/03A61B6/06
Inventor 任敬轶周宇付诗农
Owner SAINUO WEISHENG SCI & TECH BEIJING