JP2005195653A - X-ray radiographic base capable of easily loading cassette - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray radiographic base by which a cassette is necessarily loaded at an exact position even though the cassette is inserted in a state where it is inclined in an inserting direction to some extent in the case of loading the cassette in a bucky. <P>SOLUTION: The X-ray radiographic base by which the cassette is easily loaded is equipped with a cassette carrying means for carrying the cassette 6 in a belt traveling direction by two belts 11 and 12 and rotating the cassette coming into contact with the belts by traveling in a reverse direction to each other, Y-axis correction means 15 and 16 arranging the edge part of the cassette parallel in the belt traveling direction, X-axis correction means 17 and 18 arranging the edge part of the cassette parallel in a perpendicular direction to the belt traveling direction, a plurality of mark sensor means 19, 20 and 21 detecting the position of a mark put on the prescribed position of the cassette whose posture is corrected by the correction means, a decision means for deciding the attitude of the cassette by the combination of the mark position signals of the cassette obtained from a plurality of mark sensors, and an attitude changing means for changing the attitude of the cassette decided by the decision means by the traveling of two belts in the reverse direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an X-ray photography table, and more particularly to an X-ray photography table in which a cassette can be easily mounted on the photographing table.

The X-ray imaging table is used when imaging the inside of a human body. For example, when photographing the chest of a human body using an X-ray photography table, a medical radiation film cassette (abbreviated as “cassette”) on which an X-ray film is mounted before the human body to be photographed stands upright. Then, X-rays are irradiated from behind the human body, and X-rays transmitted through the human body are exposed to the film to obtain an image inside the human body.
In addition, there is an X-ray imaging table that performs X-ray imaging of each part of the human body while the human body is lying on the top board among the imaging tables that image the human body using X-rays.
In the above supine type X-ray photography stand, the human body as a subject is placed on the top board and the imaging part of the human body is positioned on the bucky provided on the lower surface of the top board, and then opened to the side of the bucky. Insert a cassette with a raw film through the slit, take a picture of the human body on the film, pull out the cassette, and finish the shooting for one person. Thereafter, when photographing a new human body, a series of photographing operations as described above are repeated.

In the conventional X-ray imaging table as described above, a cassette must be inserted into the Bucky slit every time the subject changes, and if the cassette is tilted with respect to the insertion direction, the image will be Therefore, care should be taken when inserting the cassette. When the shape of the film attached to the cassette is not square but rectangular, care is particularly taken in the insertion direction, but no clear conventional example for solving such a problem is found.
JP 08-262598 A JP 2001-149358 A

  As described above, the problem to be solved is that, as described above, when the cassette is mounted on the bucky, X-ray imaging is always performed even if the cassette is inserted with a certain degree of inclination relative to the insertion direction. To provide a stand.

In the invention according to claim 1 of the present application, two belts are run side by side, a cassette that is in contact with the belt when traveling in the same direction is conveyed in the belt traveling direction, and the cassette that is in contact with the belt is rotated when traveling in the opposite direction. Cassette conveying means, Y-axis correcting means for pressing and pressing the edge of the cassette in contact with the belt so that the edge of the cassette is aligned parallel to the belt running direction, and pushing the edge of the cassette in contact with the belt X-axis correcting means for pressing and aligning the edge of the cassette in a direction perpendicular to the belt running direction, and a plurality of mark sensor means for detecting a mark position attached to a predetermined position of the cassette whose posture has been corrected by the correcting means; Determining means for determining the appearance of the cassette by a combination of cassette mark position signals obtained from a plurality of mark sensors; and determining by the determining means when the two belts are running in the reverse direction. The mounting of the cassette, characterized to provide a simple X-ray photography base that includes a figure changing means for changing the figure of the cassette which, a.
In addition to the invention described in claim 1, the invention described in claim 2 is easy to mount the cassette, wherein the cassette for setting the cassette can be freely inserted from both ends of the cassette transport means. Provide an X-ray photography stand.
The invention according to claim 3 of the present application provides an X-ray photography table that is easy to mount, wherein the cassette is rectangular in addition to the invention according to claim 1.
According to a fourth aspect of the present invention, in addition to the first aspect of the present invention, there is provided an X-ray photography table in which the cassette is easy to mount, wherein the cassette is square.
The invention according to claim 5 of the present application, in addition to the invention according to claim 1, is provided with a cassette insertion direction detecting means for detecting the passage of the cassette in the vicinity of the slit, and is easy to mount the cassette. Provide an X-ray photography stand.
The invention according to claim 6 of the present application, in addition to the invention according to claim 1, is characterized in that the X-ray photography table is a supine X-ray photography table and is easy to mount a cassette. Provide X-ray photography stand.
The invention described in claim 7 of the present application, in addition to the invention described in claim 1, is that the mark attached to the cassette is attached at a position overlapping the center line attached to the cassette when viewed from the surface. An X-ray photography stand that can be easily mounted with a cassette is provided.

  In the present invention, when the cassette is mounted on the bucky, even if the cassette is inserted with a certain degree of inclination relative to the insertion direction, the cassette is always mounted at an accurate position, so that the image of the affected area can be copied to the desired position on the film. I can do it.

  Since the cassette position correcting mechanism is installed in the bucky where the cassette is mounted, X-ray imaging can be performed after the cassette is always mounted at an accurate position.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a perspective view of a supine X-ray photography table 1 for photographing a person to be photographed on a top board (photographing table) 2, wherein 3 is a base, Reference numeral 4 denotes a driving device that moves the top plate 2 up and down. Inside the drive device 4, there are provided a drive motor, a pantograph mechanism for transmitting this drive force to the top plate 2, a control device, etc., which are surrounded by bellows, but the mechanism is out of the scope, Since it is a well-known thing, the detailed description of the structure is abbreviate | omitted. A gap is formed between the lower surface of the top plate 2 and the upper portion of the driving device 4, and a bucky 5 for mounting a cassette is provided in the gap. The bucky 5 is fixed to the upper part of the driving device 4. Two slits into which the cassette 6 can be inserted are provided in the left-right direction of the bucky 5.

  FIG. 2 is a plan view showing an arrangement of main internal parts of the bucky 5. In FIG. 2, slits 7 and 8 for inserting and removing the cassette 6 are formed on the left and right sides of the bucky 5. Optical sensors 9 and 10 for detecting the passage of the cassette 6 are provided in the vicinity of the slits 7 and 8. Inside these optical sensors 9, 10 are provided two belt conveyors 11, 12 for carrying the cassette 6 in the bucky 5 in the center direction and discharging the photographed cassette 6 from the slits 7, 8. The belt conveyors 11 and 12 are separately driven and controlled by two pulse motors 13 and 14, respectively.

  On the outside of the two belt conveyors 11 and 12, an upper Y-axis correction plate 15 and a lower Y-axis correction plate 16 are arranged to correct the cassette carried by the belt conveyor to a predetermined position in the center by moving in the center direction. Is provided. Further, between the two belt conveyors 11 and 12, the left X-axis correction plate 17 and the right X-axis correction plate 18 which move in the center direction to correct the cassette on the belt conveyor to a predetermined position in the center. Is provided. Note that if the left X-axis correction plate 17 and the right X-axis correction plate 18 protrude above the belt conveyor when they are at the initial positions at both ends, it will interfere with the movement of the cassette to be loaded. In the initial position (outermost position), such as by using rails having different heights, these are lowered below the upper surfaces of the belt conveyors 11 and 12. The dotted line frame 6 on the belt conveyor indicates the appearance of the cassette 6 that has been carried in. Reference numeral 19 denotes a center mark sensor for detecting a center mark attached to the cassette 6, which will be described later. This is detected at the position where the center mark of the cassette 6 comes when the cassette 6 is set at the normal position. Reference numeral 20 denotes a left mark sensor, 21 denotes a right mark sensor, which is provided on a virtual horizontal line crossing the center of the cassette. The left mark sensor 20 detects a center mark coming to the left of the center position. The sensor 21 detects a center mark on the right side of the center position. These mark sensors 19, 20, and 21 are optical detectors if the center mark is optical, and magnetic sensors if the center mark is magnetic, but any sensor that can detect a cassette sensor mark. For example, regardless of the structure, it is only necessary to detect the center mark of the cassette.

Here, the structure of the cassette will be described. Since the JIS standard for X-ray film has been established for the cassette, the dimensions of the cassette that accommodates the cassette that accommodates it are also established by the JIS standard. is there. Any structure may be used as long as the film is stored in the cassette outer frame so as not to be warped and the film can be easily inserted and removed with a single-sided back cover and the center line is clearly shown on the surface. FIG. 4A is a schematic diagram of the cassette as viewed from the front, and CL indicates a center line drawn on the surface. In order to clearly indicate the position and state of the cassette, a sign is attached to each corner. The upper left corner position of the cassette 6 is set to s, and then set to p, q, and r in the clockwise direction. A center mark CM is attached to the case back on the center line CL and slightly below the point where it intersects the upper edge sp. The center mark CM is composed of, for example, a permanent magnet.
The operations of the belt conveyor, the correction plate, and the like are performed by a computer-configured programmable sequence controller (hereinafter referred to as PSC).

Next, the operation of the present invention will be described with a focus on the flowchart shown in FIG.
When performing X-ray imaging, it is assumed that the cassette 6 is inserted at one of the slits 7 and 8, for example, the left slit 7 with a slight inclination with respect to the running of the belt conveyor (see FIG. 4B). ). In this insertion, the cassette 6 inserted into the slit 7 blocks the light beam of the optical sensor 9 provided in the vicinity of the slit 7 (step T1). In response to this signal, the PSC knows that the cassette has been inserted into the bucky, and stores the inserted slit 7 in the storage device (left side insertion storage) (step T2).

  At the same time that the optical sensor 9 detects the insertion of the cassette 6, the pulse motors 13 and 14 are driven so that the belt conveyors 11 and 12 run in the same direction, and the cassette 6 placed thereon is tilted. Transport in the center direction. In FIG. 2, the position of the cassette 6 is indicated by a dotted frame (step T3). When the cassette 6 reaches near the center, the pulse motors 13 and 14 are stopped, and the belt conveyors 11 and 12 are also stopped. Note that the stop position of the cassette 6 that stops on the belt conveyor does not have to be an exact position, and may be in the vicinity of the approximate position to be fixed.

  Soon after the belt conveyors 11 and 12 stop, the upper and lower Y-axis correction plates 15 and 16 start moving in the center direction (step T5). When the upper and lower Y-axis correction plates 15 or 16 come into contact with the cassette 6 on the belt conveyors 11 and 12, the upper Y-axis correction plate 15 and the lower Y-axis correction plate 16 push the upper and lower short sides of the cassette 6 against each other. Then, this is moved (positioned up and down) and stopped in the state shown in FIG. With this operation, the cassette 6 is aligned in the vertical direction. When this stop is confirmed by the stop of the upper and lower Y-axis correction plates 15 and 16 (step T6), the interval between the upper Y-axis correction plate 15 and the lower Y-axis correction plate 16 is measured, and the initially set cassette is set. (Step T7). When the measured interval is equal to the set interval, the cassette 6 is in a vertically long normal posture, so the flow moves to the next step T8.

  With the above operation, the cassette 6 is only aligned in the vertical direction, and the horizontal alignment is not yet performed. In order to perform this easily, the upper Y-axis correction plate 15 and the lower Y-axis correction plate 16 which are once in contact with the upper and lower short sides of the cassette 6 are slightly separated from the upper and lower short sides of the cassette 6 (step T8). If this state is taken, the cassette 6 can move freely. And as shown to step T9, the left X-axis correction board 17 and the right X-axis correction board 18 approach the cassette 6 from the left-right direction. When the left X-axis correction plate 17 and the right X-axis correction plate 18 are at the extreme end positions, that is, the initial position, the lower X-axis correction plate 17 and the right X-axis correction plate 18 are located below the belt conveyor so as not to disturb the movement of the cassette 6 on the belt conveyor. Although retracted, when the operation shown in step T8 is performed, these appear above the running surfaces of the belt conveyors 11 and 12.

Then, the left X-axis correction plate 17 and the right X-axis correction plate 18 are pressed against the left and right long sides of the cassette 6, moved (aligned left and right), and stopped (step T9). With this operation, the cassette 6 is aligned in the left-right direction. Next, as in step T <b> 10, the upper Y-axis correction plate 15 and the lower Y-axis correction plate 16 press the upper and lower short sides of the cassette 6 again. At this time, the cassette 6 of the left X-axis correction plate 17 and the right X-axis correction plate 18 may be slightly tightened to make the movement of the cassette 6 smooth. Even if the cassette 6 is inserted into the slit 7 from the beginning in an accurate state as shown in FIG. 4A, the position correcting operation as described above is performed. Thereafter, in order to confirm that the cassette 6 has been set at a normal position, the center mark CM on the cassette 6 is read by the center mark sensor 19 disposed on the line per (step T11).
Note that the range in which this operation can be performed is an angle θ formed by a line per perpendicular to a horizontal line g parallel to the running direction of the belt conveyor, as shown in FIGS. 4B and 4C. Is an acute angle, and the cassette center line CL is overlapped with the vertical line per.

  By the operation so far, the cassette 6 is moved to an accurate position, and the upper Y-axis correction plate 15, the lower Y-axis correction plate 16, the left X-axis correction plate 17, and the right X-axis correction plate 18 are accurately moved on the belt conveyor. The center mark CM fixed to the correct position and marked on the cassette 6 is detected by the center mark sensor 19 to confirm the correct setting of the cassette 6, the series of setting operations of the cassette 6 is finished, and X-ray imaging Is done. After photographing the cassette 6, the insertion direction of the cassette 6 is read from the storage device, and the upper Y-axis correction plate 15, the lower Y-axis correction plate 16, the left X-axis correction plate 17, and the right X-axis correction plate 18 are respectively While returning to the initial position, the belt conveyors 11 and 10 operate in the direction opposite to that at the time of insertion, and are discharged to the outside through the slit 7 in which the cassette 6 is inserted.

Returning to step T7 of the above flow, when the distance between the upper Y-axis correction plate 15 and the lower Y-axis correction plate 16 is measured, when the measured interval is not equal to the set interval, that is, the measured interval is When the interval is larger than the set interval, the cassette 6 is tilted considerably and inserted into the slit 7, and the upper Y-axis correction plate 15 and the lower Y-axis correction plate 16 cannot move by pressing the cassette dead center. Indicates.
For example, in the state of FIG. 4D, the angle θ formed between the diagonal line d connecting the corner points s and q and the line (horizontal line) g indicating the traveling direction is a right angle, and the upper Y-axis correcting plate 15 and the lower Y The shaft correcting plate 16 presses the dead points s and q of the cassette 6, and the cassette 6 is in a state where it cannot move.

  Further, as shown in FIG. 4E, when the cassette 6 is tilted and inserted, a diagonal line d connecting the corner points p and r far from the line g indicating the traveling direction of the cassette 6 in the vertical direction and the traveling direction. When the angle θ formed between the line g and the line g is obtuse, the height (h ′) of the point P is smaller than the height (h) when the corner point P is on the perpendicular per, or FIG. As shown in FIG. 4 (f), when the cassette 6 is tilted and inserted, a diagonal line d 'connecting the corner points s and q far from the line g indicating the traveling direction of the cassette 6 in the vertical direction indicates the traveling direction. Even when the angle θ formed between the line g and the line g is an acute angle, the step (S) is smaller in height (h ″) than the height (h) when the corner point S is on the perpendicular per. When the upper and lower Y-axis correction plates 15 or 16 come into contact with the cassettes 6 on the belt conveyors 11 and 12 at T5, the upper Y-axis correction plate 15 and the lower Y-axis Since the axis correction plate 16 presses the left and right long sides of the cassette 6, the cassette 6 is laid sideways, and the interval between the upper and lower Y axis correction plates 15 and 16 is the same as the short side. Since these intervals are both abnormal, the flow moves to step T12.

  In step T12, the upper and lower Y-axis correction plates 15 and 16 are temporarily returned to their original positions. Next, in step T13, when the distance between the upper Y-axis correction plate 15 and the lower Y-axis correction plate 16 is larger than the set value, the corner point sq or pr that becomes the dead point of the cassette 6 is pushed and the cassette 6 cannot move. State. At this time, the center mark CM is not detected by any of the mark sensors 19, 20, and 21. When this state is detected by the PSC, the pulse motors 13 and 14 are slightly rotated in opposite directions (step T14). By this operation, the belt conveyors 11 and 12 move slightly in opposite directions, so the cassette 6 rotates slightly and its dead center is removed. Since the cassette 6 takes one of the positions shown in FIGS. 4A and 4C, the operation returns to step T5 and the cassette position correcting operation is repeated.

  In step T13, when the interval between the upper Y-axis correction plate 15 and the lower Y-axis correction plate 16 is smaller than the set value and the interval is the same as the short side of the cassette 6, is the cassette 6 lying sideways in the right direction? Or it is a case where it is lying down in the left direction. In this state, the center mark CM of the cassette 6 is detected by one of the mark sensors 20 and 21. When detected by the left mark sensor 20, the cassette 6 is laid down from the state of FIG. 4 (e), and when detected by the right mark sensor 21, the cassette 6 is laid down from the state of FIG. 4 (f). This is the case.

When detected by the left mark sensor 20, the cassette 6 is laid down from the position shown in FIG. 4 (e). Therefore, the flow moves to step T16, the pulse motor 13 is rotated forward, and the pulse motor 14 is turned on. Reverse. Due to the movement of the belt conveyors 11 and 12, the cassette 6 is rotated approximately 90 degrees clockwise, and the appearance of the cassette 6 is restored to the position shown in FIG. 4A. Then, returning to step T5, the cassette position correcting operation is repeated.
When the right mark sensor 21 detects the cassette 6, the cassette 6 is laid down from the position shown in FIG. 4 (f). Therefore, the flow moves to step T17, the pulse motor 13 is reversed, and the pulse motor 14 is moved forward. Turn. Due to the movement of the belt conveyors 11 and 12, the cassette 6 is rotated approximately 90 degrees counterclockwise, and the appearance of the cassette 6 is restored to the position shown in FIG. 4A. Then, returning to step T5, the cassette position correcting operation is repeated.

  In addition, the case where the cassette 6 is inserted in the slit with the top and bottom reversed is conceivable. In such a case, the center mark CM is read in step T11 of FIG. 3, but when the cassette is inserted upside down, none of the mark sensors 19, 20, and 21 detects the center mark. Therefore, when no detection signal is found in the mark sensors 19, 20, and 21 in step T11, for example, the flow may be returned to the beginning of step T4 to repeat the cassette position correcting operation.

  Depending on the type of cassette, this may be square. In this case, the position of the cassette may be determined by detecting the position of the center mark CM of the cassette.

  As mentioned above, although this invention was demonstrated by the above-mentioned embodiment, various deformation | transformation and application are possible within the range of the main point of this invention, and these deformation | transformation and application are not excluded from the scope of the present invention.

  Even if the cassette is turned on without worrying about the vertical direction, the operator will not make any operation mistakes. Further, it can be applied to a bucky of an X-ray imaging apparatus that moves up and down on a column.

FIG. 1 is a perspective view of a supine X-ray photography table of the present invention. FIG. 2 is a plan view showing an arrangement of main internal parts of the bucky 5. FIG. 3 is a flowchart for explaining the operation of the present invention. FIG. 4 is an explanatory view for explaining the insertion body of the cassette.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Supine X-ray photography stand 2 ... Top plate 3 ... Base 4 ... Drive device 5 ... Bucky 6 ... Cassette 7 ... Slit 8 ... Slit DESCRIPTION OF SYMBOLS 9 ... Optical sensor 10 ... Optical sensor 11 ... Belt conveyor 12 ... Belt conveyor 13 ... Pulse motor 14 ... Pulse motor 15 ... Upper Y-axis correction board 16 ... Lower Y axis correcting plate 17 ... Left X axis correcting plate 18 ... Right X axis correcting plate 19 ... Center mark sensor CL ... Center line CM ... Center mark g ... Horizontal line per ...・ Vertical line

Claims (7)

Cassette conveying means for causing two belts to run in parallel, conveying a cassette in contact with the belt in traveling in the same direction in the belt traveling direction, and rotating the cassette in contact with this in traveling in opposite directions;
Y-axis correcting means for pressing and pressing the edge of the cassette in contact with the belt so that the edge of the cassette is aligned parallel to the belt running direction;
X-axis correcting means for pressing the edge of the cassette in contact with the belt and aligning the edge of the cassette in a direction perpendicular to the belt running direction;
A plurality of mark sensor means for detecting a mark position attached to a predetermined position of the cassette whose posture has been corrected by the correcting means;
Determining means for determining the appearance of the cassette by a combination of cassette mark position signals obtained from a plurality of mark sensors;
A posture changing means for changing the posture of the cassette determined by the determining means in the reverse running of the two belts;
An X-ray photography stand that is easy to mount a cassette.   2. The X-ray photography table of claim 1, wherein the cassette for setting the cassette is freely insertable from both ends of the cassette conveying means.   The X-ray photography table of claim 1, wherein the cassette is rectangular.   2. The X-ray photography table of claim 1, wherein the cassette is square.   2. The X-ray photography table of claim 1, wherein a cassette insertion direction detecting means for detecting passage of the cassette is provided in the vicinity of the slit.   The X-ray photography table according to claim 1, wherein the X-ray photography table is a supine X-ray photography table.   2. The X-ray photography table of claim 1, wherein the mark attached to the cassette is attached at a position overlapping with a center line attached to the cassette when viewed from the surface.

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