JP2013006013A - X-ray ct device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray CT device which can improve safety to a person to be inspected by surely detecting the contact of the person to be inspected with a gantry.SOLUTION: The X-ray CT device comprises: an X-ray tube 400 which irradiates the person to be inspected with an X-ray; an X-ray detection part 402 which is arranged at the X-ray tube 400 so as to oppose it and detects the X-ray which has permeated the person 110 to be inspected; and the gantry 100 in which the X-ray tube 400 and the X-ray detection part 402 are rotatably arranged and which has an opening 104 for moving the person 110 to be inspected. The X-ray CT device also comprises a cover plate 208 formed of a transparent member and a contact detection part 302 for detecting pressure applied to the cover plate 208, and the cover plate 208 is arranged so as to cover a display 204 or a laser projector 206 arranged at the gantry 100.

Description

  In the X-ray CT apparatus, the gantry is provided with a display unit for displaying information necessary for the subject or the operator, and the safety of the subject when the subject contacts the gantry near the display unit. Regarding functions to be secured.

  The X-ray CT apparatus is provided with a gantry having an X-ray tube and an X-ray detector rotatably arranged and having an opening for inserting a subject. By rotating the X-ray tube and the X-ray detector around the subject while irradiating X-rays, the X-ray transmitted through the subject is detected by the X-ray detector. A tomographic image is constructed based on the data detected by the X-ray detector.

  The gantry is equipped with a plurality of planar contact detectors, with the curved portions adjacent to each other, and when the gantry tilts and any one of the contact detectors contacts the subject inserted into the opening, the gantry In some cases, the tilting is stopped (for example, Patent Document 1).

JP-A-8-257023

  However, in Patent Document 1, a slit for irradiating a laser beam, an operation unit for an operator to operate, or a display unit provided on the gantry is a contact for detecting contact between the subject and the gantry. No detection unit is provided. Therefore, since the contact between the subject and the gantry cannot be detected even if the subject comes into contact with the slit or the operation unit, it seems that the safety aspect for the subject was insufficient.

  An object of this invention is to provide the X-ray CT apparatus which can improve the safety | security with respect to a subject by detecting the contact of a subject and a gantry reliably.

  In order to achieve the object of the present invention, an X-ray tube that irradiates a subject with X-rays, an X-ray detector that is disposed opposite to the X-ray tube and detects X-rays transmitted through the subject, and an X-ray tube And an X-ray detector, and an X-ray CT apparatus comprising a gantry having an opening for moving a subject, a covering plate formed of a transparent member, and a cover The gantry includes a contact detection unit that detects contact between the subject and the covering plate based on the pressure applied to the mounting plate, and the covering plate is a surface of the display unit or the laser projector installed in the gantry. It is laid to cover. Therefore, contact between the subject and the gantry can be reliably detected, and safety for the subject can be improved.

The display unit is a display unit for a subject that is installed to face obliquely downward with respect to the vertical direction and displays information for the subject to the subject. A covering plate is provided so as to cover the display unit and the gap formed by the gantry and the gap formed by the laser projector and the gantry.
The covering plate corresponding to the visible light transmitting region through which the visible light of the image displayed on the display unit transmits and the laser light transmitting region through which the laser light emitted from the laser projector transmits is made of a transparent member, and the visible light transmitting region The covering plate corresponding to the region other than the laser light transmission region is made of an opaque member.

  ADVANTAGE OF THE INVENTION According to this invention, the safety | security with respect to a subject can be improved by detecting the contact of a subject and a gantry reliably.

The external view of the X-ray CT apparatus of this invention. The figure which shows the characteristic part of the gantry 100 of the X-ray CT apparatus of this invention of this invention. Sectional drawing which cut | disconnected the gantry 100 of the X-ray CT apparatus of this invention. The block block diagram of the X-ray CT apparatus of this invention.

  The X-ray CT apparatus of the present invention will be described with reference to the drawings.

  The overall configuration of the X-ray CT apparatus will be described with reference to FIG. 1 and FIG. FIG. 1 is an external view of an X-ray CT apparatus. In the X-ray CT apparatus, an X-ray tube and an X-ray detection unit are rotatably arranged, and a gantry 100 having an opening 104 and a subject 110 are laid down, and the subject is placed in the opening 104 of the gantry 100. A table 102 having a drive unit for moving 110, an image processing unit 120 for performing reconstruction processing of CT data by processing measurement data detected by the X-ray detection unit, and a display unit 122 for displaying a CT image The operator inputs the name of the subject, the date and time of the examination, the imaging conditions, etc., and the operation unit 124 that operates each of the above-described components, and the control that controls each of the above-described components based on the instructions of the operation unit Part 126 is provided.

  The operation display unit forming the image processing unit 120, the display unit 122, the operation unit 124, and the control unit 126 shown on the right side of FIG. 1 is installed outside the photographing room. The control unit 126 may be installed in the gantry 100.

  The table 102 (top plate) is installed on the floor surface of the photographing room together with the gantry 100 and can move in the vertical direction and the horizontal direction. Although not shown, the table 102 includes a top plate for lying down the subject 110, a drive unit that moves the top plate in the vertical direction and the horizontal direction, and a position detection unit (for example, a potentiometer) that detects the position of the top plate. have.

  FIG. 2 is a view showing the characteristic part of the gantry 100 of the X-ray CT apparatus of the present invention. FIG. 2 (a) is a diagram showing the position of the characteristic part of the gantry 100. FIG. 2B is an enlarged view of the region 200 that is a characteristic part of the gantry 100. The region 200 is a region surrounded by a broken line in FIG.

  As shown in FIG. 2A, the region 200 that is a characteristic part of the gantry 100 is located above the opening 104 of the gantry 100. A region 200 that is a characteristic part of the gantry 100 is a region that may come into contact with the subject 110 when the gantry 100 is tilted or the table 102 is moved upward.

As shown in FIG. 2 (b) in which the region 200, which is a characteristic part of the gantry 100, is enlarged, the operator displays information for the operator such as the position of the table 102 and imaging conditions to the operator. Display unit 202, subject display unit 204 that displays information for the subject such as the X-ray irradiation status and breathing of the subject 110 to the subject 110, and imaging of the subject 110 A laser projector 206 that irradiates a laser beam to set a median line, a display unit 204 for the subject, and a covering plate 208 provided so as to cover the surface of the laser projector 206 are provided. A covering plate 208 is covered so as to cover the gap formed by the subject display unit 204 and the gantry 100 and the gap formed by the laser projector 206 and the gantry 100.

The covering plate 208 is a transparent member that can mainly transmit light such as laser light emitted from the laser projector 206, visible light of the image displayed on the subject display unit 204, and infrared light. It is configured. Therefore, even if the covering plate 208 is covered with the laser projector 206, the laser projector 206 can pass the laser light through the covering plate 208 and irradiate the outside of the gantry 100. Further, even if the subject display unit 204 is covered by the covering plate 208, visible light that is information displayed on the subject display unit 204 passes through the covering plate 208, so that the subject 110 can confirm information displayed on the display 204 for the subject from outside the gantry 100. In the present embodiment, the surfaces of the subject display unit 204 and the laser projector 206 are covered with a single cover plate 208, but the subject display unit 204 and the laser projector 206 are individually covered. A cover 208 may be provided, or a cover installed on the operator display unit 202 or other gantry 100, or a cover 208 that covers an exterior cover of the gantry 100 that is likely to come into contact with the subject.

  The operator display unit 202 is installed on the gantry 100 so that its display surface is substantially in contact with the vertical direction, and is installed toward the front of the gantry 100 so that the operator can easily see it. Therefore, the operator can see the operator display unit 202 in a standing state, and can confirm the information displayed on the operator display unit 202.

  The display unit 204 for the subject is installed in a direction obliquely downward with respect to the vertical direction, and is installed in the direction of the table 102 on which the subject 110 is lying so that the subject 110 is easy to see. ing. Therefore, the subject 110 can check the information displayed on the subject display unit 204 by looking at the subject display unit 204 while lying on the table 102.

  The laser projector 206 is installed in the diagonally downward direction of the opening 104 of the gantry 100, and is installed in the direction of the table 102 on which the subject 110 is lying, like the display unit 204 for the subject. . The laser projector 206 is installed at a position that does not interfere with X-ray irradiation by the X-ray tube and X-ray detection by the X-ray detector.

  Here, the characteristic part of the gantry 100 of the X-ray CT apparatus will be described in detail with reference to FIG. FIG. 3 is a cross-sectional view of the gantry 100 in the AA ′ cross section shown in FIG. 2 (b).

  The subject display unit 204 is installed inside the gantry 100 via a fixing unit 300 installed on the back surface of the exterior cover of the gantry 100. The inside of the gantry 100 is the side where the X-ray tube and the X-ray detector are installed.

  The laser projector 206 that irradiates laser light to set the imaging midline of the subject 110 irradiates the subject 110 with laser light that is aligned in the left-right direction along the longitudinal direction of the table 102, for example. To do. A laser light irradiation range 210 indicates a laser light irradiation range irradiated from the laser projector 206.

  The covering plate 208 is installed on the exterior cover of the gantry 100 via the contact detection unit 302. The covering plate 208 is plate-shaped and has an area that covers the surface of the display unit 204 for the subject and the laser projector 206. In other words, the covering plate 208 is a surface switch that can detect contact between the display unit 204 for the subject or the laser projector 206 and the periphery thereof and the subject 110.

  The covering plate 208 is slightly bent when coming into contact with the subject 110, and has an appropriate rigidity for transmitting pressure applied from the outside such as the subject 110 to the contact detection unit 302. The slight deflection when in contact with the subject 110 is based on safety considerations for the subject 110.

  The covering plate 208 is installed so that the laser light emitted from the laser projector 206 is not refracted. Specifically, the covering plate 208 is installed so that the laser light emitted from the laser projector 206 is incident on the surface of the covering plate 208 perpendicularly.

  When the subject 110 comes into contact with the covering plate 208, the pressure applied from the subject 110 is transmitted to the contact detection unit 302. When pressure is transmitted to the contact detection unit 302, the tilt of the gantry 100 and the movement of the top plate of the table 102 are stopped.

  Note that in the covering plate 208, a visible light transmission region 304 through which the visible light of the image displayed on the display 204 for the subject is transmitted and a laser light transmission region 306 through which the laser light emitted from the laser projector 206 is transmitted. Is made of a transparent member. The region other than the visible light transmission region 304 and the laser light transmission region 306 can be formed of a transparent member, but the contact detection unit 302 is transmitted and can be seen from the outside. Therefore, in this embodiment, the region other than the visible light transmission region 304 and the laser light transmission region 306 (the region inscribed in the contact detection unit 302) of the covering plate 208 does not impair the aesthetics of the gantry 100. Further, it can be constituted by an opaque member. That is, the covering plate 208 corresponding to the visible light transmitting region 304 through which the visible light of the image displayed on the subject display unit 204 is transmitted and the laser light transmitting region 306 through which the laser light emitted from the laser projector 206 is transmitted. Is made of a transparent member, and the covering plate 208 corresponding to a region other than the visible light transmission region 304 and the laser light transmission region 306 is made of an opaque member. For example, the color of the covering plate 208 corresponding to a region other than the visible light transmission region 304 and the laser light transmission region 306 is set to the same color as the gantry 100.

  The internal configuration of the X-ray CT apparatus of the present invention will be described with reference to FIG. The gantry 100 includes a rotating disk part 106 having an opening 104 into which a subject 110 lying on a table 102 enters, and an X-ray tube 400 and an X-ray detecting part 402 mounted on the rotating disk part 106. Yes. The rotating disk unit 106 rotates around the subject 110 together with the X-ray tube 400 and the X-ray detection unit 402. The gantry 100 also has a tilting mechanism that allows the rotating disk unit 106 to rotate in a state where the rotation axis of the rotating disk unit 106 is tilted with respect to the upper surface of the table 102 (tilting of the gantry 100).

  The X-ray tube 400 is a device that irradiates the subject 110 lying on the table 102 with X-rays. A collimator 404 installed between the X-ray tube 400 and the subject 110 is a device that limits the irradiation range of X-rays irradiated from the X-ray tube 400. The X-ray detection unit 402 is a device that is disposed opposite to the X-ray tube 400 on the rotating disk unit 106 and detects X-rays transmitted through the subject 110. The X-ray detection unit 402 has a large number of X-ray detection elements arranged in the rotation direction of the rotary disk unit 106, or two-dimensional arrangement of the rotation direction of the rotary disk unit 106 and the rotation axis direction.

  The image processing unit 120 is an apparatus that reconstructs a CT image by performing arithmetic processing on measurement data transmitted from the X-ray detection unit 402. The image processing unit 120 also has a function of storing image data of CT images. The display unit 122 is a device that displays the CT image created by the image processing unit 120.

  The control unit 126 controls the power input to the X-ray tube 400 based on the imaging conditions input from the operation unit 124, in particular, the X-ray tube voltage and the X-ray tube current. The subject 110 is irradiated with X-rays corresponding to the above. The X-ray detection unit 402 detects X-rays irradiated from the X-ray tube 400 and transmitted through the subject 110 with a large number of X-ray detection elements of the X-ray detection unit 402, and measures the distribution of transmitted X-rays.

  The rotation speed of the rotary disk unit 106, the tilt angle (tilt) of the rotation shaft, and the like are set by the operation unit 124. The table 102 is controlled by the control unit 126, and the top plate of the table 102 moves based on the photographing conditions set by the operation unit 124, particularly the helical pitch.

  By repeating the X-ray irradiation from the X-ray tube 400 and the measurement of the transmitted X-ray distribution by the X-ray detection unit 402 along with the rotation of the rotating disk unit 106, projection data from various angles is acquired. The acquired projection data from various angles is transmitted to the image processing unit 120. The image processing unit 120 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 unit 122.

  The control unit 126 is connected to the operator display unit 202, the subject display unit 204, the laser projector 206, the contact detection unit 302, the table 102, and the X-ray tube 400. A part of the control unit 126 may be installed in the gantry 100.

  When the subject 110 comes into contact with the covering plate 208, the pressure applied from the subject 110 is transmitted to the contact detection unit 302. When the pressure is detected by the contact detection unit 302 and transmitted to the control unit 126, the control unit 126 determines that the subject 110 has contacted the covering plate 208. The control unit 126 has a function (determination unit) for performing the determination.

  When it is determined that the contact detection unit 302 is in contact with the subject 110 while the gantry 100 is tilted, the control unit 126 stops the tilt of the gantry 100. The evacuation of the gantry 100 is performed by the operator using the operation unit 124.

  Further, when it is determined that the contact detection unit 302 is in contact with the subject 110 while moving the top plate of the table 102, the control unit 126 moves the top plate with respect to the drive unit of the table 102. Stop.

  In this way, when the table 102 moves while the subject 110 is lying on the table 102 and the subject 110 contacts the covering plate 208 serving as a surface switch, the control unit 126 moves the table 102. Or stop tilting the gantry 100. When the movement of the table 102 stops or when the tilt of the gantry 100 stops, the control unit 126 transmits an alarm that the subject 110 has touched the covering plate 208 to the operator.

  Specifically, when the subject 110 comes into contact with the covering plate 208, the control unit 126 displays information on the operator display unit 202 that the subject 110 has touched the covering plate 208. Therefore, the operator can appropriately move the subject 110 to a safe position by checking the information displayed on the operator display unit 202.

  When the subject 110 comes into contact with the covering plate 208, the control unit 126 changes the irradiation mode of the laser light emitted from the laser projector 206. For example, the laser projector 206 blinks the laser light. Therefore, the operator can appropriately move the subject 110 to a safe position by confirming the irradiation form of the laser light.

  As described above, according to the present embodiment, the X-ray tube 400 that irradiates the subject with X-rays, and the X-ray detection unit 402 that detects the X-rays that are disposed to face the X-ray tube 400 and pass through the subject 110, An X-ray CT apparatus comprising a gantry 100 having an opening 104 for moving a subject 110, wherein an X-ray tube 400 and an X-ray detector 402 are rotatably arranged, and are made of a transparent member A covering plate 208 to be formed and a contact detection unit 302 that detects a pressure applied to the covering plate 208 are provided. The covering plate 208 covers the display unit 204 or the laser projector 206 installed in the gantry 100. So as to be laid.

  By reliably detecting contact between the subject 110 and the gantry 100, the safety of the subject 110 can be improved.

  100 gantry, 102 table, 104 opening, 106 rotating disk, 110 subject, 120 image processing unit, 122 display unit, 124 operation unit, 126 control unit, 202 operator display unit, 204 display for patient , 206 Laser projector, 208 Covering plate, 302 Contact detector, 400 X-ray tube 400 X-ray detector

Claims (8)

An X-ray tube that irradiates a subject with X-rays, an X-ray detector that is disposed opposite to the X-ray tube and detects X-rays transmitted through the subject, the X-ray tube and the X-ray detector An X-ray CT apparatus comprising a gantry having an opening for moving the subject,
A cover plate formed of a transparent member; and a contact detection unit that detects a pressure applied to the cover plate. The cover plate covers a display unit or a laser projector installed in the gantry. An X-ray CT apparatus that is covered with a X-ray CT apparatus.   The said display part is a display part for a subject which is installed in the diagonally downward direction with respect to the vertical direction and displays information for the subject to the subject. X-ray CT apparatus described in 1.   2. The covering plate is provided so as to cover the gap formed by the display unit and the gantry, and the gap formed by the laser projector and the gantry. X-ray CT system.   2. The cover plate according to claim 1, wherein the covering plate is slightly bent when coming into contact with the subject, and has rigidity to transmit pressure applied from the subject to the contact detection unit. X-ray CT system.   2. The X-ray CT according to claim 1, wherein the covering plate is installed so that laser light emitted from the laser projector is incident perpendicularly to a surface of the covering plate. apparatus.   The covering plate corresponding to a visible light transmitting region through which visible light of the image displayed on the display unit transmits and a laser light transmitting region through which laser light emitted from the laser projector is transmitted is formed of a transparent member, The X-ray CT apparatus according to claim 1, wherein the covering plate corresponding to a region other than the visible light transmission region and the laser light transmission region is made of an opaque member.   The X-ray CT apparatus according to claim 6, wherein a color of the covering plate corresponding to a region other than the visible light transmission region and the laser light transmission region is the same color as the gantry.   A control unit that determines that the subject has contacted the cover plate based on the pressure detected by the contact detection unit, and the contact detection unit is configured to be in contact with the subject when the gantry is tilted. The X-ray CT apparatus according to claim 1, wherein when it is determined that the gantry is in contact with the gantry, the control unit stops the tilting of the gantry.

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