JP2011072343A - Radiography apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiography apparatus which elevates an X-ray tube and prevents collision between a subject and a collimator when an operator lowers a photography table to allow a subject to get on and off the photography table easily. <P>SOLUTION: When a height detecting means 11 detects that output voltage of a position detecting means 8 (the height position of the photography table 6) reaches or becomes lower than a predetermined height (voltage), when a time detecting means 12 detects that the time period measured while lowering the photography table 6 reaches or becomes longer than a predetermined time period, or when a distance detecting means 13 detects that the move distance of the photography table 6 in the lower direction reaches or becomes longer than a predetermined distance (voltage), an X-ray tube elevating/descending control section 14 directs an X-ray tube elevating/descending drive section 5 to move the X-ray tube 3 upward. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an X-ray imaging apparatus, and more particularly to an X-ray tube for preventing a collision between a subject and a collimator held under the X-ray tube when the subject gets on and off the imaging table before and after imaging. It is related with the control means which saves.

  As shown in FIG. 2, the X-ray imaging apparatus includes an X-ray tube suspension apparatus 1 including an X-ray tube vertical drive unit 5 that suspends an X-ray tube 3 having a focal point 3 a and drives the X-ray tube up and down. The imaging table 6 on which the subject is placed, the film cassette 4 for obtaining an X-ray image transmitted through the subject, and the imaging table vertical drive unit 7 for driving the imaging table 6 up and down. And an X-ray imaging table apparatus 2 provided with position detection means 8 for detecting the height position of the imaging table 6.

  The height position of the X-ray tube 3 can be moved up and down by manual operation, and can also be moved up and down by a motor disposed in the X-ray tube vertical drive unit 5. The imaging table 6 on which the subject is placed can be moved up and down by a motor, and when the up button of a foot switch (not shown) is pressed, the imaging table 6 is raised together with the film cassette 4 and the down button is pressed. The photographing stand 6 moves down together with the film cassette 4. When the interlock switch of the operation unit (not shown) disposed in the X-ray tube suspension 1 is pressed, the distance between the focal point 3a and the detection surface of the film cassette 4 (imaging) is changed when the height position of the imaging table 6 is changed. The height position of the X-ray tube 3 is controlled so as to maintain the imaging distance set in advance.

  At the time of imaging, the surgeon lowers the height position of the imaging table 6 for the subject placed on the imaging table 6. Next, the operator raises the height position of the imaging table 6 to a position convenient for the operator in order to align the imaging region of the subject before imaging. Thus, even if the height position of the imaging table 6 is changed, the height position of the X-ray tube 3 is controlled so as to maintain a preset imaging distance by pressing the interlock switch. In general, the imaging distance of X-ray imaging performed by placing a subject on the imaging table 6 is generally set to about 1 m. For this reason, if the subject gets up immediately after imaging, there is a risk of causing a collision with a collimator held under the X-ray tube 3. Further, since the position of the imaging table 6 is high and there is a risk of dropping when the subject gets off the imaging table 6, the operator lowers the imaging table 6.

  On the other hand, in the case of general photography where the film cassette is placed on the top of the photography platform, this film height is identified by identifying that the film cassette position is different in calculating the photography distance in conjunction with the choice of photography technique. An X-ray imaging apparatus has been proposed in which an appropriate imaging distance is automatically set according to different imaging techniques by calculating the imaging distance in consideration of the difference (for example, Patent Document 1). reference).

JP 2006-68487 A

  In order to make it easier for the subject to get on and off the imaging table 6, the operator lowers the imaging table 6 and avoids collision between the subject and the collimator or makes it easier for the subject to get up. The operator needs to raise the X-ray tube 3. When the operator forgets to raise the X-ray tube 3, there is a risk of collision between the subject and the collimator.

  The present invention relates to an X-ray tube suspension device having an X-ray tube vertical drive unit that suspends an X-ray tube and drives it vertically, and an imaging table that is installed at a lower portion of the X-ray tube and carries a subject. And an X-ray imaging apparatus comprising: an X-ray imaging table apparatus including an imaging table vertical drive unit that drives the imaging table up and down; and a position detection unit that detects a height position of the imaging table. And when the height detection unit detects that the height of the imaging table is equal to or lower than a predetermined height, the X-ray is transmitted via the X-ray tube vertical drive unit. An X-ray tube up / down control unit for moving the tube upward is provided.

  Furthermore, the present invention relates to an X-ray tube suspension device having an X-ray tube vertical drive unit for suspending and driving the X-ray tube, and imaging for mounting a subject placed below the X-ray tube. In an X-ray imaging apparatus comprising an X-ray imaging table apparatus having a table and an imaging table vertical drive unit for driving the imaging table up and down, time detection means for counting the time during which the imaging table is descending, and the time X-ray tube up / down control for moving the X-ray tube upward via the X-ray tube up / down drive unit when the detection means detects that the height of the imaging table has moved downward for a predetermined time or more. It has a part.

  Furthermore, the present invention relates to an X-ray tube suspension device having an X-ray tube vertical drive unit for suspending and driving the X-ray tube, and imaging for mounting a subject placed below the X-ray tube. In the X-ray imaging apparatus comprising: an X-ray imaging table apparatus having a table, an imaging table vertical drive unit that drives the imaging table up and down, and a position detection unit that detects a height position of the imaging table; A distance detecting means connected to the means, and when the distance detecting means detects that the height of the imaging table has moved downward by a predetermined distance or more, the X-ray tube vertical drive unit is used to An X-ray tube up / down control unit that moves the tube upward is provided.

  Further, in the present invention, the height detecting means detects that the height of the photographing stand is not more than a predetermined height, and the time detecting means is such that the height of the photographing stand is on the lower side for a predetermined time or more. When detecting the movement, the X-ray tube up / down control unit moves the X-ray tube upward through the X-ray tube up / down driving unit.

  Further, in the present invention, the time detection means detects that the height of the imaging table has moved downward for a predetermined time or more, and the distance detection means detects that the height of the imaging table is lower than the predetermined distance. When detecting the movement, the X-ray tube up / down control unit moves the X-ray tube upward through the X-ray tube up / down driving unit.

  Further, in the present invention, the height detecting means detects that the height of the photographing stand is equal to or less than a predetermined height, and the distance detecting means is configured such that the height of the photographing stand is lower than a predetermined distance. When detecting the movement, the X-ray tube up / down control unit moves the X-ray tube upward through the X-ray tube up / down driving unit.

  Further, in the present invention, the height detecting means detects that the height of the photographing stand is not more than a predetermined height, and the time detecting means is such that the height of the photographing stand is on the lower side for a predetermined time or more. When the X-ray tube up / down control unit detects that the X-ray tube has moved, and the distance detection unit detects that the height of the imaging table has moved downward by a predetermined distance or more, the X-ray tube up / down control unit The X-ray tube is moved upward.

  Therefore, (1) When the height of the photographing stand is made lower than a predetermined height, (2) When the height of the photographing stand is moved downward for a predetermined time, (3) The height of the photographing stand is lowered. The X-ray tube moves upward in each case when moving to the side more than a predetermined distance. Alternatively, the X-ray tube moves upward when two or three of the three cases occur simultaneously.

  When the operator lowers the imaging table to make it easier for the patient to get on and off the imaging table, the X-ray tube automatically rises and can avoid collisions between the patient and the collimator. There is a space where you can get up easily. The surgeon can concentrate on the diagnosis without having to perform the conventional X-ray tube ascending operation for the safety of the subject.

It is a figure which shows schematic structure of the X-ray imaging apparatus by the Example of this invention. It is a figure which shows schematic structure of the conventional X-ray imaging apparatus.

  The present invention relates to an X-ray imaging apparatus including control means for retracting an X-ray tube in order to avoid a collision with a collimator when a subject gets on and off the imaging table.

  An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a schematic configuration of an X-ray imaging apparatus according to an embodiment of the present invention. As shown in FIG. 1, an X-ray imaging apparatus according to an embodiment of the present invention suspends an X-ray tube 3 having a focal point 3a and includes an X-ray tube vertical drive unit 5 that drives the X-ray tube up and down. And an imaging table 6 mounted on the lower part of the X-ray tube 3 to mount the subject, a film cassette 4 for obtaining an X-ray image transmitted through the subject, and the imaging table 6 are driven up and down. Input signals from the imaging table vertical drive unit 7, the X-ray imaging device 2 having the position detection means 8 for detecting the height position of the imaging table 6, and input signals from the position detection means 8 or the foot switch 9 are respectively processed. It is comprised by the control part 10 etc. which control the X-ray tube vertical drive part 5 by the result detected by comparing with a predetermined value.

  The height position of the X-ray tube 3 can be moved up and down by manual operation, and can also be moved up and down by a motor disposed in the X-ray tube vertical drive unit 5. The imaging table 6 on which the subject is mounted can be moved up and down by a motor. When the up button of the foot switch 9 is pressed, the imaging table 6 is raised together with the film cassette 4 and when the down button is pressed. The photographing stand 6 is lowered together with the film cassette 4. When the interlock switch of the operation unit (not shown) disposed in the X-ray tube suspension 1 is pressed, the distance between the focal point 3a and the detection surface of the film cassette 4 (imaging) is changed when the height position of the imaging table 6 is changed. The height position of the X-ray tube 3 is controlled so as to maintain the imaging distance set in advance. In many cases, the shooting distance is set in the vicinity of 1 m.

  The position detection means 8 is configured so that, for example, the resistance value of a potentiometer pivotally attached to the vertical drive mechanism of the imaging table 6 corresponds to the height position of the imaging table 6 one by one, and the resistance value is converted into a voltage. Is output. The control unit 10 includes a height detection unit 11, a time detection unit 12, a distance detection unit 13, an X-ray tube vertical control unit 14, and the like.

  The height detection unit 11 includes a comparison circuit that compares a predetermined height (voltage) stored in the control unit 10 with the output voltage of the position detection unit 8. When the height detection unit 11 detects that the output voltage of the position detection unit 8 is equal to or lower than a predetermined height (voltage), the X-ray tube vertical control unit 14 causes the X-ray tube vertical drive unit 5 to perform X-rays. Command the tube 3 to move upward. The predetermined height (voltage) is determined in advance based on a value in the vicinity of the height at which the subject can easily get on and off the imaging table 6 and is stored in the control unit 10.

  The time detection means 12 compares the time counting time with a predetermined time stored in the control unit 10 in advance and the time counting time while the lowering button of the foot switch 9 is pressed. Consists of a comparator. When the time detecting means 12 detects that the counting time of the timepiece has reached a predetermined time or more, the X-ray tube vertical control unit 14 moves the X-ray tube 3 upward with respect to the X-ray tube vertical drive unit 5. To do. The predetermined time is determined in advance and stored in the control unit 10.

  The distance detection means 13 stores the output voltage of the position detection means 8 when the down button of the foot switch 9 is pressed, and subtracts the output voltage of the position detection means 8 from the stored voltage. And a comparison circuit that compares a predetermined distance (voltage) stored in the control unit 10 with the output voltage of the subtraction circuit. When the distance detecting means 13 detects that the output voltage of the subtracting circuit has become equal to or greater than a predetermined distance (voltage), the X-ray tube vertical controller 14 controls the X-ray tube 3 with respect to the X-ray tube vertical driver 5. To move upward. The predetermined distance (voltage) is determined in advance and stored in the control unit 10.

  Since the present invention has the above configuration, the operator presses the lowering button of the foot switch 9 so that the subject placed on the imaging table 6 can easily get off the imaging table 6 after the X-ray imaging is completed. When the height position of the photographic stand 6 is lowered, the height position of the photographic stand 6 becomes (1) below a predetermined height, (2) when moved downward for a predetermined time, (3) When moving downward by a predetermined distance or more, the control unit 10 detects a deviation, and moves the X-ray tube 3 upward to avoid a collision between the subject and the collimator. After confirming that the distance between the X-ray tube 3 and the imaging table 6 is sufficiently wide, the surgeon instructs the subject on the imaging table 6 to get up.

  As described above, since the operator does not need to move the X-ray tube 3 upward in order to avoid a collision between the subject and the collimator, the time required for this operation is not required. The time to get up can be shortened, and the efficiency of the examination can be expected. On the other hand, when the surgeon performs an ascending / descending operation to adjust the height position of the imaging table 6 to a convenient high position in order to align the imaging region of the subject, the control unit 10 performs the above-described operation. None of the cases (1), (2), and (3) is detected, and the X-ray tube 3 does not move upward.

  In the embodiment shown in the figure, the X-ray tube vertical controller 14 individually receives the detection signal from the height detector 11, the time detector 12, or the distance detector 13. The X-ray tube 3 is moved upward via the detection signal, but when the detection signal is simultaneously transmitted from the height detection means 11 and the time detection means 12 or simultaneously from the time detection means 12 and the distance detection means 13. The X-ray tube up / down control unit 14 moves the X-ray tube 3 upward via the X-ray tube up / down driving unit 5 when the height detection unit 11 and the distance detection unit 13 transmit simultaneously. However, the present invention is applicable. Alternatively, when the detection signal is simultaneously transmitted from the height detection unit 11, the time detection unit 12, and the distance detection unit 13, the X-ray tube vertical control unit 14 moves the X-ray tube 3 through the X-ray tube vertical drive unit 5. The present invention is applicable even if it is moved upward.

  In the embodiment, after the X-ray imaging is completed, the X-ray tube 3 is moved upward when the subject placed on the imaging table 6 is lowered to make it easier for the subject to descend from the imaging table 6. Although it is moved, the present invention can also be applied to the case where the X-ray tube 3 is moved upward when the imaging table 6 is lowered so that the subject can easily get on the imaging table 6 before X-ray imaging. is there. As described above, the present invention is not limited to the illustrated examples and includes various modifications.

  The present invention relates to an X-ray imaging apparatus, and more particularly to an X-ray tube for preventing a collision between a subject and a collimator held under the X-ray tube when the subject gets on and off the imaging table before and after imaging. It may be used as a control means for saving

DESCRIPTION OF SYMBOLS 1 X-ray tube suspension apparatus 2 X-ray imaging stand apparatus 3 X-ray tube 3a Focus 4 Film cassette 5 X-ray tube vertical drive part 6 Imaging stand 7 Imaging stand vertical drive part 8 Position detection means 9 Foot switch 10 Control part 11 High Length detecting means 12 Time detecting means 13 Distance detecting means 14 X-ray tube vertical control unit

Claims (7)

  An X-ray tube suspension device having an X-ray tube vertical drive unit for suspending and driving the X-ray tube, an imaging table installed under the X-ray tube and carrying a subject, and this imaging An X-ray imaging apparatus comprising an X-ray imaging table device having an imaging table vertical drive unit that drives the table up and down, and a position detection unit that detects a height position of the imaging table, is connected to the position detection unit. When the height detection unit and the height detection unit detect that the height of the imaging table is equal to or lower than a predetermined height, the X-ray tube is moved upward via the X-ray tube vertical drive unit. An X-ray imaging apparatus comprising an X-ray tube up / down control unit for movement.   An X-ray tube suspension device having an X-ray tube vertical drive unit for suspending and driving the X-ray tube, an imaging table installed under the X-ray tube and carrying a subject, and this imaging An X-ray imaging apparatus comprising an X-ray imaging table device having an imaging table vertical drive unit for vertically driving a table, a time detection unit for counting a time during which the imaging table is descending, and the time detection unit configured to perform the imaging An X-ray tube up / down control unit is provided for moving the X-ray tube upward via the X-ray tube up / down drive unit when it is detected that the height of the table has moved downward for a predetermined time or more. X-ray imaging apparatus characterized by this.   An X-ray tube suspension device having an X-ray tube vertical drive unit for suspending and driving the X-ray tube, an imaging table installed under the X-ray tube and carrying a subject, and this imaging An X-ray imaging apparatus comprising an X-ray imaging table device having an imaging table vertical drive unit that drives the table up and down, and a position detection unit that detects a height position of the imaging table, is connected to the position detection unit. When the distance detection unit and the distance detection unit detect that the height of the imaging table has moved downward by a predetermined distance or more, the X-ray tube is moved upward via the X-ray tube vertical drive unit. An X-ray imaging apparatus comprising an X-ray tube up / down control unit for movement.   The height detecting means detects that the height of the photographing stand is below a predetermined height, and the time detecting means detects that the height of the photographing stand has moved downward for a predetermined time or more. 3. The X-ray imaging apparatus according to claim 1, wherein the X-ray tube up / down control unit moves the X-ray tube upward via the X-ray tube up / down driving unit.   The time detection means detects that the height of the imaging table has moved downward for a predetermined time or more, and the distance detection means has detected that the height of the imaging table has moved downward for a predetermined distance or more. 4. The X-ray imaging apparatus according to claim 2, wherein when detected, the X-ray tube up / down control unit moves the X-ray tube upward through the X-ray tube up / down driving unit.   The height detecting means detects that the height of the photographing stand is equal to or less than a predetermined height, and the distance detecting means detects that the height of the photographing stand is moved downward by a predetermined distance or more. 4. The X-ray imaging apparatus according to claim 1, wherein the X-ray tube up / down control unit moves the X-ray tube upward through the X-ray tube up / down driving unit.   The height detecting means detects that the height of the photographing stand is below a predetermined height, and the time detecting means detects that the height of the photographing stand has moved downward for a predetermined time or more. And when the distance detecting means detects that the height of the imaging table has moved downward by a predetermined distance or more, the X-ray tube up-and-down control unit passes the X-ray tube through the X-ray tube up-and-down driving unit. 4. The X-ray imaging apparatus according to claim 1, wherein the tube is moved upward.

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