JP2012016478A - Bed apparatus and x-ray ct apparatus equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bed apparatus easily manufactured and provided with a top plate in a structure suppressing artifact.SOLUTION: The bed apparatus includes the top plate having a rectilinear shape and a cross-sectional area gradually increasing from the end of the top plate in the longitudinal direction. In particular, the bed apparatus has the top plate on which a subject is placed. The top plate has an end part having an inclined upper surface, when the top plate is viewed from above, the end part has a trapezoidal shape or a triangular shape whose width is reduced as it approaches its end.

Description

  The present invention relates to a medical image diagnostic apparatus, and more particularly to a bed apparatus having a top plate on which a subject is placed.

  An X-ray CT (Computed Tomography) device, which is one of medical image diagnostic devices, is an X-ray tube device that irradiates a subject with X-rays, and an X-ray detection that detects the X-ray dose transmitted through the subject as projection data The tomographic image of the subject is reconstructed using projection data from a plurality of angles obtained by rotating the instrument around the subject, and the reconstructed tomographic image is displayed. The image displayed by the X-ray CT apparatus describes the shape of an organ in the subject and is used for diagnostic imaging.

  In the X-ray CT apparatus, a bed apparatus having a top plate on which the subject is placed is used to move the subject to a position where X-rays are irradiated. A material having a low X-ray absorption rate is used for the top plate on which the subject is placed, but an artifact occurs because the X-ray absorption rate suddenly changes from 0 to several percent at the tip of the top plate.

  In Patent Document 1, in order to prevent the occurrence of such an artifact, the top portion of the top plate is formed in an arc shape, or the lower surface of the top portion of the top plate is inclined.

Japanese Patent Laid-Open No. 9-224931

  However, in Patent Document 1, no consideration is given to facilitating the production of the top board.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bed apparatus including a top plate that can be easily manufactured and has a structure that suppresses the generation of artifacts.

  In order to achieve the above object, the present invention is characterized by comprising a top plate that is configured in a linear shape and has a shape in which a cross-sectional area gradually increases as it advances in the longitudinal direction from the longitudinal tip of the top plate. is there.

  Specifically, it is a bed apparatus having a top plate on which a subject is placed, and the top plate has an inclined upper surface at the front end in the longitudinal direction, and the top plate is viewed from above. The shape of the tip portion is a trapezoidal shape or a triangular shape whose width becomes narrower toward the tip.

  ADVANTAGE OF THE INVENTION According to this invention, the bed apparatus provided with the top plate of the structure which can be manufactured easily and suppresses generation | occurrence | production of an artifact can be provided.

The perspective view explaining the external appearance of the whole X-ray CT apparatus which is an example of the medical image diagnostic apparatus of this embodiment The block diagram which shows the whole structure of the X-ray CT apparatus which is an example of the medical image diagnostic apparatus of this invention Perspective view of bed apparatus 105 It is a diagram showing the shape of the top plate 4 of the first embodiment, FIG. 4 (a) is a top view of the top plate 4, FIG. 4 (b) is an enlarged top plate 4 in A of FIG. 4 (a) 4 (c) is a BB cross-sectional view of FIG. 4 (a), and FIG. 4 (d) is a CC cross-sectional view of FIG. 4 (a). Top view of the top plate 4 of the second embodiment Longitudinal sectional view of the top plate 4 of the third embodiment Top view of the top plate 4 of the fourth embodiment

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a medical image diagnostic apparatus according to the present invention will be described with reference to the accompanying drawings. In the following description and the accompanying drawings, the same reference numerals are given to the constituent elements having the same functional configuration, and redundant description will be omitted.

  First, the overall structure of an X-ray CT apparatus, which is an example of a medical image diagnostic apparatus according to the present embodiment, will be described with reference to FIGS. FIG. 1 is an external view of the X-ray CT apparatus 1, and FIG. 2 is a block diagram showing the overall structure. As shown in FIGS. 1 and 2, the X-ray CT apparatus 1 includes a scan gantry unit 100 and an operation unit 120.

  The scan gantry unit 100 includes an X-ray tube device 101, a rotating disk 102, a collimator 103, an X-ray detector 106, a data collection device 107, a bed device 105, a gantry control device 108, and a bed control device 109. And an X-ray control device 110. The X-ray tube apparatus 101 is an apparatus that irradiates the subject 2 placed on the bed apparatus 105 with X-rays. The collimator 103 is a device that limits the radiation range of X-rays emitted from the X-ray tube device 101. The rotating disk 102 includes an opening 104 into which the subject 2 placed on the bed apparatus 105 enters, and the X-ray tube device 101 and the X-ray detector 106 are mounted to rotate around the subject 2 It is. The X-ray detector 106 is a device that measures the spatial distribution of transmitted X-rays by detecting X-rays that are disposed opposite to the X-ray tube device 101 and transmitted through the subject 2, and includes a number of X-ray detection elements. Are arranged in the rotating direction of the rotating disk 102, or two-dimensionally arranged in the rotating direction of the rotating disk 102 and the rotating shaft direction. The data collection device 107 is a device that collects the X-ray dose detected by the X-ray detector 106 as digital data. The gantry control device 108 is a device that controls the rotation of the rotary disk 102. The bed control device 109 is a device that controls the vertical movement of the bed device 105. The X-ray control device 110 is a device that controls electric power input to the X-ray tube device 101. The bed apparatus 105 will be described in detail later.

  The console 120 includes an input device 121, an image arithmetic device 122, a display device 125, a storage device 123, and a system control device 124. The input device 121 is a device for inputting a subject's name, examination date and time, imaging conditions, and the like, specifically a keyboard or a pointing device. The image computation device 122 is a device that performs CT processing on the measurement data sent from the data collection device 107 and performs CT image reconstruction. The display device 125 is a device that displays the CT image created by the image calculation device 122, and is specifically a CRT (Cathode-Ray Tube), a liquid crystal display, or the like. The storage device 123 is a device that stores data collected by the data collection device 107 and image data of a CT image created by the image calculation device 122, and is specifically an HDD (Hard Disk Drive) or the like. The system control device 124 is a device that controls these devices, the gantry control device 108, the bed control device 109, and the X-ray control device 110.

  The X-ray tube device 101 is controlled by the X-ray controller 110 controlling the power input to the X-ray tube device 101 based on the imaging conditions input from the input device 121, in particular, the X-ray tube voltage and the X-ray tube current. Irradiates the subject 2 with X-rays according to imaging conditions. The X-ray detector 106 detects X-rays irradiated from the X-ray tube apparatus 101 and transmitted through the subject 2 with a number of X-ray detection elements, and measures the distribution of transmitted X-rays. The rotating disk 102 is controlled by the gantry control device 108, and rotates based on the photographing conditions input from the input device 121, particularly the rotation speed. The couch device 105 is controlled by the couch control device 109 and operates based on the photographing conditions input from the input device 121, particularly the helical pitch.

  By repeating the X-ray irradiation from the X-ray tube device 101 and the measurement of the transmitted X-ray distribution by the X-ray detector 106 along with the rotation of the rotating disk 102, projection data from various angles is acquired. The acquired projection data from various angles is transmitted to the image calculation device 122. The image calculation device 122 reconstructs the CT image by performing back projection processing on the transmitted projection data from various angles. The CT image obtained by the reconstruction is displayed on the display device 125.

  FIG. 3 is a perspective view of the bed apparatus 105 as viewed from the opening 104 side. The couch device 105 includes a top board 4 and a couch body 5. The top plate 4 is slidably mounted on the bed body 5 along the longitudinal direction. Under the control of the bed control device 109, the top 4 is slid toward the opening 104, the subject 2 is transported into the opening 104, and is stopped at a predetermined position.

  The shape of the top plate 4 will be described with reference to FIG. Fig. 4 (a) is a top view of the top plate 4, Fig. 4 (b) is an enlarged view of the tip of the top plate 4 that is enlarged in A of Fig. 4 (a), Fig. 4 (c) is Fig. 4 (a). BB sectional view of FIG. 4 and FIG. 4 (d) are CC sectional views of FIG. 4 (a). In the following description, the surface on which the subject 2 is placed is called the top surface of the top plate, the opposite surface is called the bottom surface, the side close to the opening 104 is called the front of the top plate, and the opposite side is called the back. That is, the left side of FIGS. 4 (a), (b), and (d) is the front of the top plate 4. FIG.

  The top plate 4 of the present embodiment has a shape in which the upper surface of the front end portion has an inclination, and the thickness becomes thinner toward the front end. Further, the shape of the tip when the top plate 4 is viewed from above is a trapezoidal shape whose width becomes narrower toward the front tip. The rear shape of the top plate 4 is a rectangle when viewed from above, and the BB cross section of the top plate 4 has a trapezoidal shape with a wide width on the upper surface side. The top plate 4 is composed of, for example, a urethane foam part 6 and a carbon part 7 surrounding the periphery. Urethane foam and carbon are materials with high X-ray transmittance, and carbon is a material with high mechanical strength. With such a configuration, the top plate does not hinder the detection of X-rays transmitted through the subject 2 while maintaining sufficient strength and rigidity to support the weight of the subject 2. In addition, the material which comprises a top plate is not limited to foaming urethane and carbon.

  The top plate 4 of the present embodiment has a linear shape as a whole including the tip portion, and has a shape in which the cross-sectional area gradually increases from the tip portion of the top plate in the longitudinal direction. Since the tip portion is configured in a linear shape, the top plate 4 of the present embodiment can be easily manufactured as compared with a top plate having an arc-shaped tip portion. In addition, since the cross-sectional area gradually increases from the top of the top plate in the longitudinal direction, the X-ray absorption rate does not change abruptly from 0 to several percent, suppressing the occurrence of artifacts. It has a structure that can be done. That is, the top plate 4 of the present embodiment can be easily manufactured and the occurrence of artifacts can be suppressed.

  Further, as shown in FIG. 4 (d), a connecting portion 9 is provided on the rear lower surface of the top plate 4, and a roller 8 is provided on the front side of the bed main body 5, respectively. The connection portion 9 is for connecting the top plate 4 and the bed body 5 and can slide on the bed body 5 in the front-rear direction and can rotate the top plate 4 in the direction of the arrow 10. Yes. The roller 8 is in contact with the lower surface of the top plate 4 and rotates as the top plate 4 slides in the front-rear direction. In this embodiment, since the bottom surface of the top plate 4 is flat and the contact surface between the bottom surface of the top plate 4 and the roller 8 is large, the roller 8 is more stable than when the bottom surface of the top plate 4 is curved. And can be rotated. In FIG. 4C, an example of the position of the roller 8 is indicated by a dotted line.

  Further, a slot 41 for attaching a headrest for holding the head of the subject 2 is provided at the tip of the top 4. The weight of the head of the subject 2 is about 6 kg, and a load of about 6 kg is applied to the tip of the top 4. In this embodiment, since the slot 41 for attaching the headrest is provided in the middle of the inclination of the top surface of the top end of the top plate 4, the load can be supported by the entire top end of the top plate 4. On the other hand, when a slot is provided on the bottom surface of the top portion of the top plate 4, the load is supported only on the bottom surface side of the top portion of the top plate 4. That is, the top plate 4 of this embodiment has a structure that can easily support the load applied to the top end of the top plate 4 as compared with the case where a slot is provided on the bottom surface of the top end portion of the top plate. In addition to the headrest, an extension top plate used when the length of the top plate 4 is insufficient may be attached to the slot 41. In this embodiment, since the slot 41 is provided on the top surface side of the top portion of the top plate 4, an extension top plate and a headrest can be attached while visually checking, and there is a slot on the bottom surface of the top portion of the top plate. Compared to workability during installation.

  FIG. 5 shows a top view of the top plate of the second embodiment. The shape of the tip when the top plate is viewed from above is not limited to a trapezoidal shape. In the present embodiment, the shape of the tip when the top plate is viewed from above is a triangular shape whose width becomes narrower toward the tip. Also in this case, the upper surface of the tip portion of the top plate 4 has an inclination. Also in the case of the top plate 4 shown in FIG. 5, the tip portion is configured in a straight line shape, and the cross-sectional area gradually increases from the tip portion of the top plate in the longitudinal direction. And the occurrence of artifacts can be suppressed.

  FIG. 6 shows a longitudinal sectional view of the top plate of the third embodiment. When the top plate 4 is slid, the top plate 4 is in a cantilever state with the roller 8 as a fulcrum, so that the top plate 4 bends as the top plate 4 is slid. The bending of the top 4 is a positional shift in the vertical direction of the subject 2 and is not preferable for taking a tomographic image. In this embodiment, in order to suppress the bending when the top plate 4 is slid, the top plate 4 has a thickness that increases in the longitudinal direction from the tip. By adopting such a structure, the rigidity increases as it advances in the longitudinal direction from the front end portion, so that bending when the top 4 is slid can be suppressed.

  In the present embodiment, the top plate 4 has an elevation angle with respect to the upper surface of the bed body 5 by making the height of the roller 8 with respect to the bed body 5 higher than the height of the connection portion 9. With such a structure, the top plate 4 is lifted upward as the top plate 4 is slid, so that the amount of deflection of the top plate 4 can be offset. The elevation angle of the top 4 with respect to the upper surface of the bed body 5 may be set appropriately according to the shape, size, and material of the top 4. The structure in which the top plate 4 has an elevation angle is not limited to the top plate having the cross-sectional shape shown in FIG. 6, but can be applied to the top plate having the cross-sectional shape shown in FIG.

  FIG. 7 shows a top view of the top plate of the fourth embodiment. The top plate having a structure in which the rigidity increases in the longitudinal direction from the distal end portion is not limited to the structure in FIG. In the present embodiment, the width of the top plate 4 increases as it advances in the longitudinal direction from the tip. By adopting such a structure, the rigidity increases as it advances in the longitudinal direction from the distal end portion, so that bending when the top 4 is slid can be suppressed. In addition to the structures shown in FIGS. 6 and 7, for example, a structure in which the thickness of the carbon part 7 is increased as compared with the urethane foam part 6 as it progresses in the longitudinal direction from the tip part.

  1 X-ray CT device, 100 scan gantry unit, 101 X-ray tube device, 102 rotating disk, 103 collimator, 104 opening, 105 couch device, 106 X-ray detector, 107 data acquisition device, 108 gantry control device, 109 couch Control device, 110 X-ray control device, 120 console, 121 input device, 122 image calculation device, 123 storage device, 124 system control device, 125 display device, 4 top plate, 5 bed body, 6 foamed urethane section, 7 Carbon part, 8 rollers, 9 connections, 41 slots

Claims (6)

A bed apparatus having a top plate on which a subject is placed,
The top plate has a trapezoidal shape or a triangular shape in which the top surface of the tip portion in the longitudinal direction has an inclination, and the shape of the tip portion when the top plate is viewed from above becomes narrower toward the tip. A bed apparatus characterized by that. The bed apparatus according to claim 1,
The bed apparatus, wherein the top surface of the top of the top plate has a slope provided with a slot for attaching a headrest or an extended top plate for holding the head of the subject. The bed apparatus according to claim 1 or 2,
The couch device is characterized in that the rigidity of the top plate increases as it advances in the longitudinal direction from the tip. The bed apparatus according to claim 3,
The couch is characterized in that the thickness of the top plate increases as it advances in the longitudinal direction from the tip. The bed apparatus according to claim 3,
The couch is characterized in that the width of the top plate increases as it advances from the tip in the longitudinal direction.   An X-ray CT apparatus comprising the bed apparatus according to any one of claims 1 to 5.

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