JPS6330015B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is directed to
The present invention relates to a line imaging device. In conventional devices of this type, the patient is placed on a bed top or an X-ray imaging system consisting of an X-ray tube and an X-ray image detector is moved by sliding to capture the object on the screen of an X-ray television monitor. When moving the fluoroscopic image of the examiner in the vertical direction, that is, moving the fluoroscopic image display area, there is a problem in that the fluoroscopic image of the examiner can only be moved at a constant speed. This point will be explained in detail with reference to FIGS. 1 and 2. In FIGS. 1a and 1b, 1 is a bed on which the subject P is placed, and 2 is a pedestal that supports this bed. Further, the bed 1 is provided with a top plate 1a on which the subject P is directly placed, which is movable vertically and horizontally.
3 is an X-ray tube attached to the bed 1 via a support arm 4, and 5 is an X-ray image detector consisting of an image intensifier etc. attached to the support arm 4 so as to face the X-ray tube 3. It is. With such a device, when observing a fluoroscopic image of, for example, the digestive tract of the subject P on a television monitor (not shown), the support arm 4 is moved, for example, in the longitudinal direction of the bed 1 (usually on the monitor display screen). For convenience of explanation, this is often referred to as the "vertical direction"), that is, the X-ray imaging system is slid in the vertical direction, or the top plate 1a is slid in the vertical direction, The part of the subject P to be observed is moved to the center of the X-ray imaging field of view. In the conventional apparatus, when moving the perspective image on the monitor screen up and down, the movement is specifically controlled using a movement control circuit as shown in FIG. 2, for example. In FIG. 2, 11 is an imaging system upward movement switch for moving the X-ray imaging system upward (direction A shown in FIG. 1), and 12 is an imaging system upward movement switch for moving the X-ray imaging system downward (second
13 is a top plate upward movement switch for moving the top plate 1a upward; 14 is a top plate upward movement switch for moving the top plate 1a in the B direction shown in the figure;
The top plate downward movement switches 15 to 18 are for moving the top plate downward, respectively.
Relay operated by 14, 19 is relay 15
and an imaging system drive device using, for example, a motor, for driving the X-ray imaging system upward and downward in response to the contact outputs of 16; 20 is a relay 17;
This is a top plate drive device using, for example, a motor to drive the top plate upward and downward in response to contact outputs of 1 and 18, respectively. For example, when moving the fluoroscopic image observation region to an upper region, the imaging system upward movement switch 11 is turned on and the motor of the imaging system drive device 19 is rotated normally via the relay 15, or the top plate downward movement switch 14 is turned on. is turned on and the motor of the top drive device 20 is reversed via the relay 18. In such a conventional device, the imaging system drive device 19
The slide movement speed v ₁ of the X-ray imaging system is equal to the slide movement speed v ₂ of the top plate by the top drive device 20, and even if you try to perform the slide operation of the imaging system and the slide operation of the top plate at the same time, the switch will not work. 2
The operability is poor because each device must be operated at the same time, and the moving speed of the transparent image on the monitor is generally used as a constant. However, in order to improve operability, it is desirable to move quickly when the amount of movement is large, such as when attempting to observe the stomach after observing the esophagus, and slowly when the amount of movement is small, for example. Although it is possible to achieve this by controlling the speed of the motor of the imaging system drive device 19, the cost for the motor and control system increases;
Furthermore, when the imaging system is moved at high speed, the X-ray tube vibrates when it is stopped, resulting in a disadvantage that the fluoroscopic image becomes unclear. It is also conceivable to move the top plate 1a at high speed, but this is not a preferable method because the shock given to the subject at the time of startup becomes large. The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide an X-ray imaging apparatus that has a simple and inexpensive configuration and has a variable moving speed of an imaging region. That is, the present invention is characterized by: an X-ray imaging system having an X-ray source and an X-ray image detector;
A bed top plate on which a subject is placed corresponding to the X-ray imaging system, a pedestal that supports the X-ray imaging system and the bed top plate so as to be movable along a planned direction; a first driving device for reciprocating the X-ray imaging system at a first scheduled speed in the scheduled direction; and a second driving device for reciprocating the X-ray imaging system at a first scheduled speed in the scheduled direction; A second drive device for reciprocating at a scheduled speed of and a selection operation circuit. Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a schematic configuration diagram showing the configuration of a movement control circuit to which an embodiment of the present invention is applied. Here, the same parts as in FIG. 2 described above are shown with the same reference numerals, and detailed explanation thereof will be omitted. In this case, the output of the imaging system upward movement switch 11 is connected to the relay 15, and the AND gate 21,
22, and the output of the imaging system downward movement switch 12 is connected to the relay 16 and also to AND gates 23 and 24. The output of the top plate upward movement switch 13 is connected to an AND gate 25, and the output of the top plate downward movement switch 14 is connected to an AND gate 26. Further, 27 is a high speed selection switch used when moving the perspective image at high speed, and 28 is a low speed selection switch used when moving the perspective image at low speed. (If these switches 27 and 28 are pushbutton operated switches, for example, they are mechanical lock switches that remain on once pressed until they are pressed again.) At 29, the output of the low speed selection switch 28 is connected to AND gates 23, 22 and an OR gate 29, respectively. and gate 2
The outputs of AND gates 24 and 22 are connected to an OR gate 31. The output of the OR gate 29 is connected to AND gates 25 and 26 via an inverter 32. The outputs of the OR gate 31 and the AND gate 25 are sent to the OR gate 33;
and the output of the AND gate 26 is the OR gate 34
are connected to each. The output of the OR gate 33 is connected to the relay 17, and the output of the OR gate 34 is connected to the relay 18. Next, the operation in the above-described configuration will be explained. Here, the slide driving speed of the imaging system is v ₁ and the slide driving speed of the top plate is v ₂ . For example, when moving a perspective image on a monitor at high speed, the high speed selection switch 27 is turned on. To move the perspective image upward, turn on the imaging system upward movement switch 11 to open the AND gate 21, operate the relay 18 via the OR gates 30 and 34, and turn on the top drive device 20. The motor rotates in reverse and the top plate 1a moves downward. At the same time, the imaging system upward movement switch 11 is turned on, the relay 5 is operated, and the motor of the imaging system drive device 19 rotates in the normal direction. That is, the observed part of the fluoroscopic image on the monitor screen moves upward at a speed of v ₁ +v ₂ . Furthermore, when the imaging system upward movement switch 11 is turned on while the low speed selection switch 28 is turned on, the gate of the AND gate 22 is opened and the relay 17 is operated via the OR gates 31 and 33 to drive the top plate. The motor of device 20 rotates in the normal direction. At the same time, the relay 15 is operated by the output of the imaging system upward movement switch 11, and the motor of the imaging system drive device 19 rotates in the normal direction. In other words, the fluoroscopic image observation site moves upward at a speed of v ₁ −v ₂ . by the way,
High speed selection switch 27 or low speed selection switch 2
8 is on, the AND gates 25 and 2 are connected via the OR gate 29 and the inverter 32.
In order to close the gate No. 6, the top plate 1a does not slide even if the top plate upward movement switch 13 and the top plate downward movement switch 14 are operated. Furthermore, when both the high-speed selection switch 27 and the low-speed selection switch 28 are off, the movement of the X-ray imaging system is also limited to the top plate 1a.
Movement is also carried out as before. By selectively and simultaneously driving the imaging system and the top plate 1a in this way, it becomes possible to move the perspective image observation site on the monitor up and down at four different speeds as shown in the following table.

[Table] For example, if v ₁ is 6 cm/sec and v ₂ is 4 cm/sec, then
The fluoroscopic image observation site can be moved at arbitrary speeds of 10 cm/sec, 6 cm/sec, 4 cm/sec, and 2 cm/sec. Therefore, by simply adding a simple logic circuit and a switch to the conventional configuration, the moving speed of the fluoroscopic image observation site on the X-ray television monitor can be made variable. Moreover, even when moving relative to each other at high speeds, both the slide speed of the X-ray imaging system and the slide speed of the top plate can be approximately the same as the slide speed of conventional equipment, so there is no risk of large impact occurring when the slide stops, and the slide speed is small. It has the advantage of being able to be driven by a large capacity motor. It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof. For example, the circuit configuration for simultaneously operating the imaging system drive device 19 and the top plate drive device 20 in opposite directions by the high-speed selection switch 27 and operating both in the same direction simultaneously by the low-speed selection switch 28 may be other than the above embodiment. Various circuit configurations can also be considered. Further, in the same embodiment, the high speed selection switch 27
The low speed selection switch 28 is configured to function by operating the vertical movement switches 11 and 12 of the imaging system, and is unrelated to the operation of the top plate vertical movement switches 13 and 14; however, in contrast to this, the top plate The vertical movement switches 13 and 14 may be used to function, or it may be configured to be linked to movement switches on both the imaging system and the top plate. Furthermore, when the moving speed v ₁ of the X-ray imaging system and the moving speed v ₂ of the top plate are v ₁ = 2v ₂ or 2v ₁ = v ₂ , the relative moving speed is divided into three types: v ₁ , v ₂ , and v ₁ + v ₂ However, these
If you set v ₁ = 2v ₂ and 2v ₁ = a value other than v ₂ (however, v ₁ ≠ v ₂ ), the above-mentioned 4 of v ₁ , v ₂ , v ₁ + v ₂ , v ₁ − v ₂
Different speeds can be selected. As described in detail above, according to the present invention, it is possible to provide an X-ray imaging apparatus in which the movement speed of the imaging region is variable with a simple and inexpensive configuration.

[Brief explanation of the drawing]

Figures 1a and b are front and side views showing the configuration of a conventional slide-type X-ray fluoroscopic imaging table, respectively, and Figure 2 shows the configuration of an example of a conventional movement control circuit for an imaging region. Block Diagram FIG. 3 is a block diagram showing the configuration of essential parts of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Bed, 1a... Top board, 2... Frame, 3... X-ray tube, 4... Support arm, 5... X-ray image detector, 11... Imaging system upward movement switch, 12... Imaging system downward movement switch, 13... Top plate upward movement switch, 14...Top plate downward movement switch, 15-18...Relay, 19
...Imaging system drive device, 20...Top plate drive device, 21-
26...And gate, 27...High speed selection switch,
28...Low speed selection switch, 29-31, 33, 3
4...OR gate, 32...Inverter.

Claims (1)

[Scope of Claims] 1. An X-ray imaging system having an X-ray source and an X-ray image detector, a bed top on which a subject is placed in correspondence with this X-ray imaging system, and these X-ray imaging systems. and a pedestal for movably supporting the bed top in a predetermined direction; a first drive device for reciprocating the X-ray imaging system with respect to the pedestal in the predetermined direction at a first predetermined speed; a second driving device for reciprocating the bed top in the scheduled direction at a second scheduled speed different from the first scheduled speed; and independent driving states of the first and second driving devices. , a selection operation circuit for switching and selecting a simultaneous drive state in opposite directions and a simultaneous drive state in the same direction. 2. X according to claim 1, characterized in that the second scheduled speed in the second drive device is a speed other than 1/2 and twice the first scheduled speed.
line imaging device.