JPS6344021Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention consists of a patient bed, a tube/image plate cart movable along the patient bed, and an image plate placed in front of the front side of the patient bed facing the patient. An X-ray examination device having an image plate carrier mounted so as to be electrically movable in a direction perpendicular to the image plate, and an X-ray tube arranged rearwardly on the back side of the patient bed and centered on the image plate. It's about.

In an X-ray examination apparatus, it is desirable to have the patient as close as possible to the image plate, whether it is an X-ray film plate or an input phosphor screen of an X-ray image plate radiator, in order to sharpen the image. There is no problem in implementing the above measures when manually displacing the X-ray sight or the image plate carrier, but in a remote-controlled X-ray examination device with an electrically movable image plate carrier, , the above measures will be difficult. This is because during the examination, the thickness of the patient being considered changes when rotating the patient around its longitudinal axis or when moving the image plate carrier in the longitudinal direction of the patient bed.

In the image plate carrier described for this purpose in German Patent Specification No. 967 931, a pressure plate is mounted resiliently in front of the side facing the patient. The contact set is controlled by this pressing plate, and when the pressing plate is pressed, the electric drive device is cut off. However, in this device, the pressure plate placed between the patient and the imaging plate creates an additional radiation leakage, which further increases the distance between the patient and the imaging plate by its thickness and its elastic stroke. It is recognized as a disadvantage that no protection is provided when moving the image plate carrier in the longitudinal direction of the patient bed. Another drawback of the above solution is that
When this pressure plate powers the patient couch, the patient is clamped between the patient couch and the restrained image plate carrier.

In addition, the Federal Republic of Germany Patent Specification No.
According to No. 1942490, the pressure plate of the image plate carrier that is propelled toward the patient in a powered manner is measured, and when a certain pressure plate is reached, the motor for moving the image plate carrier to the patient is cut off. It is also known to do so. Furthermore, according to the above-mentioned patent specification, there is provided as an additional device in the drive a sliding coupling which allows the image plate carrier to be pushed back by the patient's body when the patient couch is rotated about its longitudinal axis. is also publicly known. However, this device, which acts to avoid unduly pressing the image plate carrier against the patient, does not provide sufficient protection for obese patients when the image plate carrier is moved in the longitudinal direction of the patient couch.

The present invention allows remote control of the image plate carrier to move safely in any coordinate direction,
At the same time, the aim is to develop a device that costs as little as possible.

This purpose, according to the invention, is that, in an X-ray examination apparatus of the type mentioned at the outset, the image plate carrier runs immediately before the side facing the patient bed, approximately at right angles to the longitudinal direction of the patient bed. and at least one radiation beam that does not pass through the patient's body is guided from the radiation source to two radiation detectors mounted on the image plate carrier at a distance of only a few millimeters from each other in a direction perpendicular to the image plate. and the radiation detector is connected to a control circuit for a motor for moving the image plate carrier in a direction perpendicular to the image plate, the control circuit operating the motor to move the image plate carrier. The radiation detector is configured such that a radiation detector placed at a close distance from the image plate carrier is always hit by the radiation and a radiation detector placed at a distance from the image plate carrier does not receive any radiation. This is achieved by This ensures that the aiming device is always moved towards the patient only until the radiation is interrupted.

In a further suitable modification of the invention, the radiation rays are focused in a slit-like manner in a plane perpendicular to the plane of the imaging plate, and the radiation rays are arranged several mm apart from each other in the direction perpendicular to the imaging plate. The handling of the X-ray examination apparatus is significantly facilitated if two radiation detectors mounted on the image plate carrier at a distance of . According to this, two different control pulses are emitted, one of which stops the proximity movement of the sight to the patient bed, and the radiation detector closer to the image plate carrier is activated from the patient bed. A signal is released which causes the image plate carrier to move away. The image plate carrier thus follows every movement of the patient, with the result that it always maintains the same distance to the patient.

According to a further advantageous embodiment of the invention, the image plate carrier, directed towards the patient bed and oriented at right angles to the longitudinal direction of the patient bed, is provided with a single ridge along both the upper and lower edges. rays of radiation are guided. In this way, the reliability of operation of the X-ray inspection apparatus is further significantly increased. This results in a timely one control pulse when the image plate carrier moves in the longitudinal direction of the patient bed and approaches a prominence of the patient's body.

Next, one embodiment of the device according to the present invention will be described in more detail with reference to the drawings.

In the drawing, a patient 2 supported on a tray-shaped patient bed 1 is shown in cross section. In this example,
The patient bed is rotatably supported around an axis 3 running parallel to the longitudinal axis of the patient's 2 body. in front of the other side of the patient bed facing the patient;
Immediately in front of the patient is an image plate carrier 4 to which an X-ray image amplifier 5 is connected. An X-ray tube 6 having an X-ray diaphragm 7 attached to a flange is fixed to the rear of the back side of the patient bed. The X-ray tube and image plate carrier 4 is carried in front of a tube and image plate carriage 8. The image plate carrier is driven by a motor 9 with a pinion 10 engaging a rack 11 fixed to the carriage 8.
It is possible to move toward or away from the patient bed 1 via the patient bed 1. The tube and image plate carriage 8 itself is movable in a manner not shown here parallel to the longitudinal axis of the patient bed. An input fluorescent screen 13 of the X-ray image amplifier 5 and an X-ray film cassette 14 inserted in front of the input fluorescent screen 13 are visible through the cutout 12 in the upper edge of the image plate carrier 4. The X-ray tube 6 is equipped with an X-ray imager on which the image plate is located, whether the image plate is the input phosphor screen 13 of the X-ray image amplifier 5 or a film plate or an X-ray film cassette 14 which can be inserted into the radiation path immediately in front of this. The tube 6 is fixed to the tube and imaging plate carrier 8 so that it is held in alignment. On the side of the image plate carrier 4 facing the patient 2, a radiation source 15 can be seen, the radiation 16 of which is parallel to the side of the image plate carrier 4 facing the patient bed. 2 inserted into the radiation protection flaps 17 on opposite sides of the image plate carrier at right angles to the longitudinal axis of the patient bed.
It is arranged with two radiation detectors 18 and 19.
The radiation detector is arranged in a direction perpendicular to a line perpendicular to the rear wall 20 of the image plate carrier 4 on the patient side.
They are spaced apart from each other by up to 30mm. In that case, one of the two detectors is arranged in such a way that it corresponds to a radiation beam which is guided almost closely along the rear wall 20 of the image plate carrier 4 on the patient side at a distance of approximately 2 mm. Both radiation detectors 18, 19
is connected via electrical cables 21, 22 to a control device (not shown) for a motor 9 for displacing the image plate carrier 4 relative to the tube and image plate carriage 8. Additionally, a similar second radiation detector (not shown) is associated with a second radiation detector (not shown).
A radiation source is also mounted on the image plate carrier 4, as is the illustrated radiation source and the illustrated radiation detector. The radiation of both radiation sources 15 is guided along the upper and lower edges of the rear wall 20 of the image plate carrier 4.

When the patient 2 is examined, the image plate carrier 4
is directed toward the upper side of the patient 2 by the drive motor 9, and a radiation detector 19 placed at a greater distance from one of the image plate carriers detects that the radiation is shielded by the patient's body. Therefore, it is forced to move until it no longer accepts radiation. Another signal from the radiation detector 19 then shuts off the electric drive. If then, for example, the patient 2 is brought closer to the image plate carrier 4 due to a rotation of said couch 1 about the longitudinal axis 3 of the patient couch, a part of the patient's body will be brought closer to the image plate carrier 4. The attached radiation detector 18 is also shielded. This signal serves to re-energize the drive motor 9 in the opposite direction of rotation and to further remove the image plate carrier 4 from the patient 2. The motor is then kept switched on until the latter detector 18 is no longer shielded by the patient's body. In this way, you can always be sure that
The image plate carrier 4 is located at a distance from the patient 2 that remains approximately constant. The solution to the above-mentioned problem avoids any measurement errors that occur between the patient and the image carrier, which can lead to additional and therefore radiation leakage. In order to be able to electrically move the tube and image plate cart 8 in the longitudinal direction of the patient even in obese patients, the following steps are required:
Two equivalent radiation lines 16 (only one of which is shown) are guided along both the upper cranial and lower crural edges of the image plate carrier 4, and the corresponding radiation lines of both systems are Radiation detectors 18, 19 are connected in parallel to each other. As a result, even if, for example, the image plate carrier 4 is lowered to the area of a raised body section, the image plate carrier 4 can be removed from the patient 2 in a timely manner.
This will ensure that they are given the opportunity to evacuate.

[Brief explanation of drawings]

The drawing is a partially cutaway plan view of the X-ray inspection apparatus according to the present invention. DESCRIPTION OF SYMBOLS 1... Patient bed, 2... Patient, 3... Longitudinal axis of patient, 4... Image plate carrier, 5... X-ray image amplifier, 6... X-ray tube, 7... X-ray aperture, 8 . . . tube and image plate carriage, 9 . . . motor, 10 . . . pinion, 11 . . . rack, 12 . . . ...radiation source, 16...radiation,
17... Radiation protection flap, 18, 19... Radiation detector, 20... Rear wall of image plate carrier, 21, 2
2...Electrical cable.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A bed for a patient, a tube/image plate cart movable along the bed, and an image plate carrier mounted so as to be electrically movable in a direction perpendicular to the image plate. an image plate carrier disposed in front of the front side of the patient bed facing the patient; and an X-ray tube centered on the image plate, located at the rear of the back side of the patient bed. In an X-ray examination apparatus having an X-ray tube, an image plate carrier 4 runs directly in front of the side facing the patient bed 4 at almost right angles to the longitudinal direction of the patient bed 1, and does not pass through the patient's body. At least one radiation 16 is guided from the radiation source 15 to two radiation detectors 18, 19 mounted on the image plate carrier 4 at a distance of only a few millimeters from each other in the direction perpendicular to the image plate. and the radiation detector is connected to a control circuit of a motor 9 for moving the image plate carrier 4 in a direction perpendicular to the image plates 13, 14, the control circuit controlling the motor 9. In operation, a radiation detector 18 placed at a short distance from the image plate carrier 4 is always hit by the radiation 16 and a radiation detector placed at a far distance from the image plate carrier 4. 19
An X-ray inspection device characterized in that the X-ray examination device is formed so that the terminal does not receive radiation. 2. The X-ray inspection apparatus according to claim 1, wherein the radiation 16 is narrowed into a slit in a plane perpendicular to the planes of the image plates 13 and 14. 3. A single radiation beam 16 is directed toward the patient bed 2 and guided along both upper and lower edges of the image plate carrier 4, which is oriented at right angles to the longitudinal direction of the patient bed. An X-ray examination device according to claim 1 or 2 of the utility model registration claim. 4. The X-ray machine according to claim 1 of the utility model registration claim, characterized in that the radiation detectors 18, 19 are inserted into a radiation protection flange 17 provided on one side of the image plate carrier 4. Inspection equipment.