JP3624106B2 - Digital photography stand - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital imaging table that can be used in connection with an X-ray imaging apparatus.
[0002]
[Prior art]
Conventionally, X-ray imaging has been performed by an X-ray imaging apparatus as shown in FIGS. FIG. 5 shows a side view of a conventional imaging stand 1. A patient is placed on a top plate 3 fixed to the floor by legs 2, and a cassette 5 is placed on a rail 4 provided below the top plate 3. X-ray imaging is performed by performing X-ray exposure from above after the imaging position is roughly set.
[0003]
FIG. 6 shows a side view of the imaging table 11 that does not use the cassette 5. The X-ray image intensifier 13 and the X-ray tube fixed on the top and bottom of the top plate 3 on which the patient is placed are respectively fixed by the support frame 12. 14 is arranged, and the photographing position is set by moving the support frame 12 using the moving means 15.
[0004]
Since the cassette 5 in FIG. 5 uses a film, a moving image or quick imaging cannot be performed, but a high-definition image having a large screen of 17 inches × 14 inches or more can be obtained. On the other hand, the X-ray image intensifier 13 in FIG. 6 can be manufactured with a large screen having a diameter of 16 inches, but has not been developed that can capture a rectangular image of 17 inches × 14 inches or more. . However, although the resolution is inferior to that of film, the X-ray image intensifier 13 is excellent in moving images and rapid imaging.
[0005]
[Problems to be solved by the invention]
However, it is very difficult for the imaging table 1 shown in FIG. 5 to be installed in the affected area for which the cassette 5 is intended when the patient is placed on the top 3, and the examiner sets the imaging position based on the scale. There is a problem. Further, in the imaging table 1 shown in FIG. 6, it is easy for the examiner to set the image position by using the moving means 15, but the imaging purpose is different, and the cassette 5 is used as in the imaging table 1. You cannot shoot images.
[0006]
As a modification of the photographic stand 1, a mobile photographic stand provided with casters on the legs 2 has been proposed, but in this case as well, the setting of the position of the cassette 5 is not easy. Further, it is conceivable to employ the X-ray image intensifier 13 at the imaging region in FIG. 5, but in this case as well, space becomes a problem, and it becomes very difficult to use the imaging system as shown in FIG.
[0007]
An object of the present invention is to solve the above-described problems and provide a digital photographing stand that uses a semiconductor flat sensor and is easy to operate.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a digital imaging stand according to the present invention includes a top plate on which a subject is placed and easily transmits X-rays, and a flat sensor that is disposed below the top plate and captures an X-ray image of the subject. A rail that moves the flat sensor in parallel with the top plate, a visible light camera that images the moving range of the flat sensor from above the top plate, and an electromagnetic wave transmitter that generates an electromagnetic wave attached to the visible light camera. A position detection means for detecting the position of the flat sensor by receiving the electromagnetic wave located on the flat sensor , and an image captured by the visible camera based on the position of the flat sensor detected by the position detection means And display means for overlaying and displaying the outer shape of the flat sensor on the data .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiment shown in FIGS.
FIG. 1 is a plan view of a digital photographing stand 21 in the embodiment, and FIG. 2 is a side view. A top plate made of a material that is easy to transmit X-rays and is rigid is provided on an upper portion of a leg 23 having casters 22. 24 is installed, and a rail 26 for translating the semiconductor flat sensor 25 is attached to a leg 23 below the top plate 24. The flat sensor 25 has an area of 17 inches × 17 inches to support all conventional X-ray imaging. Position detecting means 27 for detecting the position of the flat sensor 25 is provided on the rail 26, and moving means 28 for the flat sensor 25 is further provided and controlled by a movement controller 29. The flat sensor 25 is provided with a communication unit 30, and a cable 31 connected to an X-ray imaging apparatus (not shown) is connected to the communication unit 30. Further, the cable 31 includes a power line, and power to the imaging stand 21 is supplied by the power line by the cable 31.
[0010]
The position detecting means 27 controlled by the movement controller 29 moves the flat sensor 25 to a desired position on the rail 26 by the moving means 28 according to the position of the patient on the top plate 24. The position detecting means 27 is composed of three points, and can measure the distance from the camera based on the delay time from the electromagnetic wave transmitter attached to the visible light camera provided in the X-ray apparatus. If the inclination of the surface of the flat sensor 25 is not taken into consideration, the position detecting means 27 can be composed of two points. The electromagnetic wave transmission interval is around 0.1 seconds, and the position of the imaging unit of the flat sensor 25 can be displayed on the display device with a delay time corresponding to this.
[0011]
More specifically, the electromagnetic wave emitted from the transmitter reaches the three position detecting means 27 described above, but the arrival timing is different if the flat sensor 25 is not located directly below the visible light camera. That is, it is possible to calculate in which direction the planar sensor 25 is present as viewed from the visible light camera by the difference in arrival time of the signals. When this direction information is calculated, the outline of the flat sensor 25 can be displayed on the camera image as described later by calculating the difference from the direction of the currently viewed camera image. After the flat sensor 25 moves to a desired position, X-ray imaging is performed by performing X-ray exposure from above. Information such as position information of the flat sensor 25, collected image data, sensor ID, exposure synchronization signal, and the like is transmitted to the X-ray imaging apparatus via the cable 31 by the communication unit 30.
[0012]
FIG. 3 is a schematic view of connecting the digital imaging table 21 in this embodiment to the X-ray imaging apparatus 41 via the cable 31. The plurality of imaging tables 21 and the plurality of imaging apparatuses 41 are connected in any combination. And can be used. The main body 42 of the X-ray imaging apparatus 41 is supported by a caster 43, moves to a position near an arbitrary imaging table 21, and uses the visible light camera 45 to which the above-described electromagnetic wave transmitter 44 is attached. The generating device 46 can be arranged above the part of the patient to be imaged. On the other hand, an image processing device 47 and a display device 48 are provided on the main body 42, and a controller 49 is connected to the main body 42 via a cable.
[0013]
As for the X-ray exposure timing, the flat sensor 25 is activated by a signal from the controller 49, the operation completion signal becomes an exposure release signal, and the X-ray is emitted from the X-ray generator 46 after being input to the main body 42. . The X-ray image photographed by the flat sensor 25 is A / D converted in the digital photographing table 21, transferred as a digital signal to the image processing device 47 of the X-ray photographing device 41, pre-processing, frequency enhancement, gradation conversion, etc. Are displayed on the display device 48 and stored in the image processing device 47. Since the offset correction and the pseudo correction in the preprocessing are corrections dependent on the flat sensor 25, the correction data retrieved from the sensor ID number is used. The offset data collected before and after exposure may be used. The correction data need not be collected individually when the X-ray imaging apparatuses 41 have the same characteristics, and may be copied and used by connecting the X-ray imaging apparatuses 41 via a network (not shown). Is possible.
[0014]
FIG. 4 shows the position information of the patient photographed by the visible light camera 45, and the position outline of the flat sensor 25 is displayed on the display device 48 as described above so as to overlay the image from above the patient. . In the display device 48, the X-ray image and sensor position display can be switched by the controller 49.
[0015]
In addition, as described above, there are a plurality of digital imaging tables 21 in a hospital, and when each is connected to a plurality of X-ray imaging apparatuses 41 and used, depending on the imaging apparatus 41, X-ray exposure may occur. In order to cancel the difference in print characteristics when characteristics such as timing and wavelength are different or when a moving grid (not shown) is added, correction data may be collected for each photographing apparatus 41.
[0016]
【The invention's effect】
As described above, the digital photographing stand according to the present invention detects the position of the planar sensor that is hidden by the top plate and cannot be seen, and overlays and displays the outer shape of the planar sensor on the visible image photographed from above, and performs the photographing operation. Make it easy.
[Brief description of the drawings]
FIG. 1 is a plan view of a digital photographing stand.
FIG. 2 is a side view of a digital photographing stand.
FIG. 3 is a schematic diagram in which a digital imaging table is connected to an X-ray imaging apparatus.
FIG. 4 is a plan view of the display device.
FIG. 5 is a side view of a conventional photographing stand.
FIG. 6 is a side view of a conventional photographing stand.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 21 Digital imaging stand 25 Plane sensor 26 Rail 27 Position detection means 28 Moving means 29 Top plate 30 Communication means 31 Cable 41 X-ray imaging apparatus 44 Electromagnetic wave transmitter 45 Visible light camera 46 X-ray generation apparatus 47 Image processing apparatus 48 Display apparatus

Claims (3)

A top plate on which a subject is placed and easily transmits X-rays, a flat sensor that is arranged below the top plate and picks up an X-ray image of the subject, a rail that moves the flat sensor parallel to the top plate, The visible light camera that images the moving range of the flat sensor from above the top plate, an electromagnetic wave transmitter that generates an electromagnetic wave attached to the visible light camera, and the electromagnetic wave that is located on the flat sensor and receives the electromagnetic wave. position detecting means for detecting the position of the plane sensor, display means for displaying overlaid an outer shape of the planar sensor to image data picked up by the visible light camera on the basis of the position of the plane sensor detected by said position detecting means digital imaging table, characterized in that it comprises a. Use connecting from above the top plate and the X-ray generating means for irradiating X-rays on the plane sensor through an object, an imaging apparatus and an image capturing means for capturing the image data captured by the plane sensor and, digital imaging table according to claim 1, further comprising a synchronizing means for adjusting the timing of the image data acquisition of X-ray exposure and the planar sensor between the imaging device. The digital imaging table according to claim 1, wherein an X-ray imaging image plane of the flat sensor has a short shape and has a size of 14 inches × 17 inches or more.

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