JP2019063429A - Medical image diagnostic system - Google Patents

Abstract

To provide a medical image diagnostic system in which trenches for the rails for running a medical image diagnostic apparatus can be made shallower while ensuring the electrical robustness and safety of the rails.SOLUTION: A medical image diagnostic system according to the embodiment comprises a medical image diagnostic apparatus, a transportation part, rails, a first energization part, and a second energization part. The medical image diagnostic apparatus has a cradle. The transportation part transports the cradle. The transportation part runs on the rails. The first energization part is mounted in at least a part of the rails and connected to an external power source. The second energization part is mounted in at least a part of the transportation part and electrically connected to the first energization part to deliver the power from the external power source to at least one of the transportation part and the cradle. The first energization part has a conductor, in which at least one of angles formed by a straight line connecting two end parts of the conductor in a horizontal direction among directions orthogonal to the cradle running direction and a tangential line connecting each of the two end parts and an apex of the first energization part is 90 degrees or less.SELECTED DRAWING: Figure 8

Description

  Embodiments of the present invention relate to medical diagnostic imaging systems.

  BACKGROUND In recent years, there is a medical image diagnostic apparatus in which a gantry is configured to be able to travel. For example, in an X-ray CT (Computed Tomography) apparatus, a gantry travels on a rail by being supplied with power, and moves a subject placed on a bed to a position where it can capture an object.

  In order to set up a self-propelled stand, it is necessary to work under the floor. In order to enable construction in many hospitals, there was a demand to make the floor digging as shallow as possible. Moreover, when a rail is provided under the floor, there is a concern that dust and water droplets may collect on the rail.

JP 2014-230637 A Unexamined-Japanese-Patent No. 2015-112301

  The problem to be solved by the present invention is to provide a medical image diagnostic system capable of making a floor of a rail shallow while securing the electrical robustness and safety of the rail on which the medical image diagnostic apparatus travels. It is.

  A medical image diagnostic system according to an embodiment includes a medical image diagnostic apparatus, a transport unit, a rail, a first energizing unit, and a second energizing unit. The medical image diagnostic apparatus has a gantry. The transport unit transports the gantry. The transport unit travels on the rails. The first conducting unit is connected to an external power supply and provided on at least a part of the rail. The second conducting unit is provided in at least a part of the transport unit, and conducts electricity with the first conducting unit to supply power from the external power supply to at least one of the transport unit and the gantry. In addition, the first conducting portion has a conductor, and in the conductor, two ends of the conductor are connected to connect two horizontal ends in a direction orthogonal to the traveling direction of the gantry. At least one of angles formed by a straight line and a tangent of a shape connecting each of the two end portions and the apex of the first current-carrying portion is 90 degrees or less.

FIG. 1 is a perspective view showing a medical image diagnostic system according to the first embodiment. FIG. 2 is a side view showing a medical image diagnostic system according to the prior art. FIG. 3 is a side view showing a medical image diagnostic system according to the prior art. FIG. 4 is a diagram for explaining a power feeding method according to the prior art. FIG. 5 is a diagram for explaining a power feeding method according to the prior art. FIG. 6 is a side view showing the medical image diagnostic system according to the first embodiment. FIG. 7 is a side view showing the medical image diagnostic system according to the first embodiment. FIG. 8 is a cross-sectional view showing the current-carrying part according to the first embodiment. FIG. 9 is a cross-sectional view showing the current-carrying part according to the first embodiment. FIG. 10 is a functional block diagram showing a functional configuration of the medical image diagnostic system according to the first embodiment. FIG. 11 is a cross-sectional view showing a current-carrying part according to another embodiment. FIG. 12 is a cross-sectional view showing a conducting part according to another embodiment.

  Hereinafter, a medical image diagnostic system according to an embodiment will be described with reference to the drawings. The embodiment is not limited to the following embodiment. In addition, the contents described in one embodiment apply in principle to the other embodiments as well.

First Embodiment
FIG. 1 is a perspective view showing the configuration of a medical image diagnostic system 100 according to the first embodiment. As shown in FIG. 1, the medical image diagnostic system 100 according to the first embodiment includes a gantry 10, a transport unit 20, a rail 30, a bed 80, and a console 90.

  Here, the gantry 10, the bed 80, and the console 90 may be collectively referred to as the medical image diagnostic apparatus 1. Hereinafter, the case where the medical image diagnostic apparatus is an X-ray CT (Computed Tomography) apparatus will be described. Further, as shown in FIG. 1, an orthogonal coordinate system consisting of an X axis, a Y axis and a Z axis is defined. That is, the X axis indicates the horizontal direction, the Y axis indicates the vertical direction, and the Z axis indicates the traveling direction of the gantry 10. In FIG. 1, the traveling direction is indicated by a broken line AA. In the orthogonal coordinate system, the direction indicated by the arrow is a positive direction.

  The gantry 10 irradiates the subject P with X-rays, and collects projection data from detection data of the X-rays transmitted through the subject P. The bed 80 places the subject P thereon. The console 90 receives an operation of the X-ray CT apparatus by the operator and reconstructs CT image data from the projection data acquired by the gantry 10.

  The rail 30 is a traveling path of the gantry 10. As shown in FIG. 1, the rails 30 are provided on the floor 40. The rail 30 should just be comprised with the material in which the conveyance part 20 can travel, for example, it is desirable for the weight of the mount frame 10 to be bearable. As one example, the rail 30 is formed with a rack.

  The transport unit 20 transports the gantry 10. For example, the transport unit 20 has a pinion as a drive mechanism. That is, when the pinion of the transport unit 20 rotates on the rack formed on the rail 30, the transport unit 20 moves on the rail 30. Then, in such a medical image diagnostic system, the gantry 10 travels on the rails 30 by the transport unit 20, and moves to the imaging position of the subject P placed on the bed 80.

  In such a medical image diagnostic system 100, for example, the gantry 10 travels on the rail 30 via the transport unit 20, and moves to a position where the subject P placed on the bed 80 can be imaged. Then, the X-ray CT apparatus captures an image of the subject P placed on the bed 80. Subsequently, the gantry 10 travels on the rail 30 via the transport unit 20 and moves to a position away from the bed 80 such that a doctor can secure a space for surgery. Subsequently, a user such as a doctor specifies an operation site using, for example, a medical image captured by the X-ray CT apparatus, and operates the specified site. In addition, after the specified site is operated by a doctor, imaging of the operated site may be performed. In this case, the gantry 10 travels on the rail 30 via the transport unit 20, and moves again to a position where the subject P placed on the bed 80 can be imaged.

  Here, in the X-ray CT apparatus of a type in which the gantry self-propelled, it is necessary to supply power for causing the gantry to self-propelled. First, with reference to FIGS. 2 and 3, a method of supplying power to the transport unit and the rack will be described. 2 and 3 are side views showing a medical image diagnostic system according to the prior art. For example, FIGS. 2 and 3 show the gantry 10 viewed from the side with respect to the traveling direction. That is, FIGS. 2 and 3 are views corresponding to the cross section indicated by the broken line AA in FIG. Moreover, in FIG.2 and FIG.3, the mount frame 10, the conveyance part 20, and the rail 30 are shown in figure.

  As shown in FIGS. 2 and 3, the rails 30 are provided on the floor 40. The rail 30 has a wiring storage space 31. The transport unit 20 receives supply of power from the wiring cable 70 connected to an external power supply (not shown). Also, the wiring cable 70 is protected by the cable guide member 71. Then, as shown in FIGS. 2 and 3, the wiring cable 70 bends in accordance with the travel of the gantry 10. That is, every time the gantry 10 self-travels, the wiring cable 70 moves.

  Such a movement causes the coating of the wiring cable 70 to deteriorate or the conductor to break. Because of this, the wiring storage space 31 needs to have a depth in consideration of the bending durability of the wiring cable 70. On the other hand, in order to install the self-propelled gantry 10, work for digging the floor is required. In order to enable construction in many hospitals, there was a demand to make the floor digging as shallow as possible. However, the bending durability of the cable 70 becomes a neck, and the floor digging can not be made shallow.

  Therefore, in order to reduce the risk of deterioration of the coating of the wiring cable 70 and breakage of the lead wire to make the floor digging shallow, for example, a power feeding method using a slip bar and a brush can be considered. FIG. 4 and FIG. 5 are diagrams for explaining a power feeding method according to the prior art. 4 and 5 show cross-sectional views of the slip bar 150 and the brush 160 as viewed from the front direction of the gantry 10. As shown in FIG. 4 shows the case where the slip bar 150 and the brush 160 are not in contact with each other, and FIG. 5 shows the case where the slip bar 150 and the brush 160 are in contact with each other.

  As shown in FIGS. 4 and 5, the slip bar 150 has a slip bar insulator 151 and a slip bar conductor 152. The brush 160 also has a brush insulator 161 and a brush conductor 162. The slip bar 150 is connected to an external power supply and provided on at least a part of the rail 30, and the brush 160 is provided on at least a part of the transport unit 20. Then, as shown in FIG. 5, when the slip bar conductor 152 and the brush conductor 162 come into contact with each other, the slip bar 150 and the brush conductor 162 are energized, and the power from the external power source is transferred to the transport unit 20 and the gantry 10. Supply. Thus, the power supply method using the slip bar 150 and the brush 160 is a contact-type power transmission method.

  However, in the contact-type power transmission method using the slip bar 150 and the brush 160 shown in FIGS. 4 and 5, dust and water droplets may be accumulated in the slip bar 150 to cause insulation failure. In addition, if the slip bar 150 and the brush 160 are misaligned, there is a risk that the insulating material is easily broken and insulation can not be maintained because the rack 10 is heavy. Furthermore, if the slip bar 150 and the brush 160 are misaligned, the contact area between the slip bar 150 and the brush 160 is reduced, which causes a voltage drop and makes it impossible to transmit the expected amount of power. And, since the slip bar 150 is exposed, if the serviceman puts his hand by mistake, there is a risk of an electric shock accident. Therefore, with the shapes shown in FIGS. 4 and 5, it is difficult to commercialize in terms of electrical safety.

  Because of this, in the medical image diagnostic system 100 according to the first embodiment, for example, the slip bar is provided with a mountain-like shape, and the brush is provided with an inclination that engages with the mountain-like shape of the slip bar. 6 and 7 are side views showing the medical image diagnostic system 100 according to the first embodiment. 6 and 7 show the gantry 10 viewed from the side with respect to the traveling direction. 6 and 7 correspond to the cross section indicated by the broken line AA in FIG. Moreover, in FIG.6 and FIG.7, the mount frame 10, the conveyance part 20, the rail 30, the slip bar 50, and the brush 60 are shown in figure.

  As shown in FIGS. 6 and 7, the slip bar 50 is connected to an external power supply via the distribution cable 70 and provided on at least a part of the rail 30. The slip bar 50 extends in the rail 30 in the traveling direction of the gantry 10. The brush 60 is provided on at least a part of the transport unit 20. The brush 60 then engages with the slip bar 50 at an arbitrary position on the slip bar 50. Thus, the brush 60 is energized with the slip bar 50. That is, by fitting the slip bar 50 at an arbitrary position of the brush 60, the power from the external power supply is supplied to the brush 60, and the brush 60 transfers the power from the external power supply to the transport unit 20 and the gantry 10. Supply.

  Then, the transport unit 20 drives the drive mechanism using the supplied power to generate power, and causes the gantry 10 to travel on the rail 30. The slip bar 50 is an example of a first energization unit, and the brush 60 is an example of a second energization unit. 6 and 7, a cross section in which the slip bar 50 and the brush 60 are fitted is shown by a broken line BB.

  8 and 9 are diagrams for explaining the power supply method according to the first embodiment. The slip bar 50 and the brush 60 are shown in FIG. 8 and FIG. Further, FIG. 8 shows the case where the slip bar 50 and the brush 60 are not in contact with each other, and FIG. 9 shows the case where the slip bar 50 and the brush 60 are in contact with each other. 8 and 9 are views corresponding to the cross section indicated by broken line BB in FIGS. 6 and 7. Although FIG. 8 shows the case where the slip bar 50 and the brush 60 are not in contact with each other for convenience of explanation, in the medical image diagnostic system 100, the slip bar 50 and the brush 60 are always in contact with each other.

  As shown in FIGS. 8 and 9, the slip bar 50 has a slip bar insulator 51 and a slip bar conductor 52. The brush 60 also has a brush insulator 61 and a brush conductor 62. In the slip bar 50, a plurality of slip bar conductors 52 of the slip bar 50 are arranged at intervals in the horizontal direction of the direction orthogonal to the traveling direction of the gantry 10.

  Here, as shown in FIGS. 8 and 9, the slip bar conductor 52 of the slip bar 50 has a mountain shape 53. In FIG. 8, the apexes 56 of the chevrons 53 of the slip bar conductors 52 are illustrated. Further, in each slip bar conductor 52, an end portion 57 and an end portion 58 in the horizontal direction in the direction orthogonal to the traveling direction of the gantry 10 are illustrated. As shown in FIG. 8, in the slip bar conductor 52, a straight line (broken line in FIG. 8) connecting two ends (the end 57 and the end 58), each of the two ends and the slip bar conductor 52 The angles formed with the tangent of the shape connecting the vertex 56 are both 90 degrees or less.

  As described above, since the slip bar conductor 52 of the slip bar 50 has the mountain-like shape 53, dust and water drops fall by their own weight. As a result, the slip bar conductor 52 can be prevented from accumulating or accumulating dust or water droplets.

  In addition, the brush conductor 62 of the brush 60 has a slope 63 that engages with the mountain shape 53. That is, the brush 60 has a brush conductor 62 having a shape that fits with the mountain-like shape 53 of the slip bar 50. When the mountain-shaped shape 53 of the slip bar conductor 52 and the slope 63 of the brush conductor 62 are engaged, the contact area between the slip bar conductor 52 and the brush conductor 62 is increased, and the positional deviation can be prevented.

  Further, as shown in FIGS. 8 and 9, the slip bar 50 is provided with a groove 54 on the outside of the slip bar conductor 52. Here, the slip bar 50 may be provided with a groove 54 outside at least one of the two ends of the slip bar conductor 52 in the horizontal direction. The groove 54 is provided vertically lower than the apex 56 of the slip bar conductor 52. Thus, when dust or water droplets adhere to the slip bar conductor 52, the dust or water droplets fall into the grooves 54 without accumulating or collecting the dust or water droplets on the slip bar conductor 52.

  Further, as shown in FIGS. 8 and 9, the slip bar 50 is provided with a partition 55 outside at least one of the two ends of the conductor in the horizontal direction. More specifically, as shown in FIGS. 8 and 9, the slip bar 50 is provided with a partition 55 outside the groove 54 in the horizontal direction. The partition 55 is made of an insulating material. Further, the partition 55 extends at a position higher in the vertical direction than the apex 56 of the slip bar conductor 52. In the brush 60, an area for storing a part of the partition 55 is formed.

  FIG. 10 is a functional block diagram showing a functional configuration of the medical image diagnostic apparatus according to the first embodiment. As shown in FIG. 10, the medical image diagnostic apparatus 1 has a gantry 10, a bed 80, and a console 90.

  The gantry 10 is an apparatus for irradiating the subject P with X-rays and collecting data on the X-rays transmitted through the subject P. The gantry 10 is an X-ray high voltage apparatus 11, an X-ray generator 12, and an X-ray detector. 13, a data acquisition circuit 14, a rotation frame 15, and a gantry control device 16. Further, in the gantry 10, as shown in FIG. 10, an orthogonal coordinate system including an X axis, a Y axis, and a Z axis is defined. That is, the X-axis indicates the horizontal direction, the Y-axis indicates the vertical direction, and the Z-axis indicates the rotation center axis direction of the rotary frame 15 when the gantry 10 is not tilted.

  The rotating frame 15 supports the X-ray generator 12 and the X-ray detector 13 so as to face each other across the subject P, and rotates at high speed in a circular orbit centered on the subject P by the gantry control device 16 Ring-shaped frame.

  The X-ray generator 12 is an apparatus that generates X-rays and irradiates the generated X-rays to the subject P. The X-ray generator 12 has an X-ray tube 12a, a wedge 12b, and a collimator 12c.

  The X-ray tube 12a is a vacuum tube which receives supply of high voltage from the X-ray high voltage device 11 and irradiates thermal electrons from the cathode (sometimes called a filament) to the anode (target). The X-ray beam is irradiated onto the subject P as the rotation of. That is, the X-ray tube 12 a generates X-rays using the high voltage supplied from the X-ray high voltage device 11.

  In addition, the X-ray tube 12a generates an X-ray beam which spreads with a fan angle and a cone angle. For example, under the control of the X-ray high-voltage device 11, the X-ray tube 12a continuously emits X-rays around the entire periphery of the subject P for full reconstruction or half reconfigurable exposure for half reconstruction. It is possible to continuously emit X-rays in the radiation range (180 degrees + fan angle). The X-ray tube 12a can intermittently emit X-rays (pulse X-rays) at a preset position (tube position) under the control of the X-ray high voltage apparatus 11. Further, the X-ray high voltage apparatus 11 can also modulate the intensity of X-rays emitted from the X-ray tube 12a. For example, the X-ray high voltage device 11 strengthens the intensity of X-rays emitted from the X-ray tube 12a at a specific tube position, and exposes the X-ray tube 12a at a range other than the specific tube position. Weaken the intensity of the emitted X-rays.

  The wedge 12 b is an X-ray filter for adjusting the X-ray dose of the X-ray emitted from the X-ray tube 12 a. Specifically, the wedge 12b transmits X-rays emitted from the X-ray tube 12a so that X-rays irradiated from the X-ray tube 12a to the subject P have a predetermined distribution. It is a filter that attenuates. For example, the wedge 12 b is a filter in which aluminum is processed to have a predetermined target angle and a predetermined thickness. The wedge is also called a wedge filter (Wedge Filter) or a bow-tie filter (Bow-tie Filter).

  The collimator 12c is formed of a lead plate or the like, and has a slit in part. For example, under control of the X-ray high voltage device 11, the collimator 12c narrows down the irradiation range of the X-ray whose X-ray dose has been adjusted by the wedge 12b with a slit.

  The X-ray source of the X-ray generator 12 is not limited to the X-ray tube 12a. For example, in place of the X-ray tube 12a, the X-ray generator 12 collides with a focusing coil for focusing the electron beam generated from the electron gun, a deflection coil for electromagnetic deflection, and an electron beam obtained by circling a half circumference of the subject P The target ring may generate an X-ray by performing processing.

  The X-ray high voltage device 11 is composed of an electric circuit such as a transformer and a rectifier, and the high voltage generator having a function of generating a high voltage to be applied to the X-ray tube 12a; It comprises an X-ray controller that controls the output voltage according to the X-ray to be The high voltage generator may be a transformer type or an inverter type. For example, the X-ray high voltage device 11 adjusts the X-ray dose irradiated to the subject P by adjusting the tube voltage and the tube current supplied to the X-ray tube 12a. Also, the X-ray high voltage device 11 receives control from the processing circuit 97 of the console 90.

  The gantry control device 16 is configured of a processing circuit configured by a CPU (Central Processing Unit) or the like, and a drive mechanism such as a motor and an actuator. The gantry control device 16 has a function of performing operation control of the gantry 10 in response to an input signal from an input interface 91 attached to the console 90 or an input interface attached to the gantry 10. For example, the gantry control device 16 is controlled to rotate the X-ray tube 12a and the X-ray detector 13 on a circular orbit centering on the subject P by receiving the input signal and rotating the rotation frame 15. Control to tilt the gantry 10 and control to operate the bed 80 and the top 82 are performed. The gantry control device 16 receives control from the processing circuit 97 of the console 90.

  In addition, the gantry control device 16 monitors the position of the X-ray tube 12a, and when the X-ray tube 12a reaches a predetermined rotation angle (imaging angle), timing for starting acquisition of data to the data acquisition circuit 14 Output a view trigger signal indicating. For example, when the total number of views in rotational imaging is 2460 views, the gantry controller 16 outputs a view trigger signal each time the X-ray tube 12a moves about 0.15 degrees (= 360/2460) on a circular orbit. Do.

  For example, the X-ray detector 13 has a plurality of X-ray detection elements (also referred to as “sensors” or simply “detection elements”) arranged in the channel direction along one arc centering on the focal point of the X-ray tube 12a. It comprises a plurality of X-ray detection element rows. The X-ray detector 13 has a structure in which a plurality of X-ray detection element rows, in which a plurality of X-ray detection elements are arranged in the channel direction, are arranged in the slice direction. Each X-ray detection element of the X-ray detector 13 is irradiated from the X-ray generator 12 to detect X-rays passing through the subject P, and an electric signal (pulse) corresponding to the X-ray dose is collected by the data acquisition device 14 Output to The peak value of this electrical signal (pulse) is correlated with the energy value of the X-ray photon. In addition, the thing of the electrical signal which each X-ray detection element outputs is also called a detection signal.

  The X-ray detector 13 is, for example, an indirect conversion detector including a grid, a scintillator array, and a light sensor array. The scintillator array is composed of a plurality of scintillators, and the scintillator is composed of a scintillator crystal that outputs light of an amount of photons according to the incident X-ray dose. The grid is disposed on the surface on the X-ray incident side of the scintillator array, and is constituted by an X-ray shield plate having a function of absorbing scattered X-rays. The optical sensor array has a function of converting into an electrical signal according to the amount of light from the scintillator, and is constituted of an optical sensor such as a photomultiplier tube, for example. Here, the light sensor is, for example, SiPM (Silicon photomultiplier). The X-ray detector 13 may be a direct conversion detector including a semiconductor element that converts incident X-rays into an electric signal.

  The data acquisition circuit 14 (DAS: Data Acquisition System) is a circuit that collects the result of the counting process from each detection element of the X-ray detector 13 and generates detection data. In other words, the data acquisition circuit 14 acquires the counting result of the X-ray detector 13. Here, the detection data is, for example, a sinogram. The sinogram is data in which the result of the counting process incident on each detection element 130 at each position of the X-ray tube 12a is arranged. The data acquisition circuit 14 acquires the result of the counting process at each view angle from the X-ray detector 13 in synchronization with the view trigger signal to generate a sinogram. The data acquisition circuit 14 repeats the process of storing the result of the counting process in the output or storage circuit 95 at regular intervals (views) and the process of resetting the result of the counting process, so that data for one round of view is obtained. To get

  Further, the data acquisition circuit 14 transmits various control signals to the X-ray detector 13. The data acquisition circuit 14 has an FPGA (Field-Programmable Gate Array). The data acquisition circuit 14 is connected to the X-ray detector 13 by, for example, a rigid flexible substrate. The rigid flexible substrate is a substrate in which a rigid wiring board portion having hardness and strength for mounting components and a bendable flexible wiring board are integrated. For example, the FPGA receives a view trigger signal from the gantry controller 16 and controls the X-ray detector 13 based on the received view trigger signal.

  The data output from the data acquisition circuit 14 is referred to as detection data, and logarithmic conversion processing and offset correction processing on the detection data, sensitivity correction processing between channels, gain correction processing between channels, pile-up correction processing, response Data subjected to preprocessing such as function correction processing and beam hardening correction is referred to as raw data. Moreover, detection data and raw data are generically called projection data.

  The bed 80 is a device for placing and moving the subject P to be scanned, and includes a bed driving device 81, a top 82, a base 83, and a base (support frame) 84.

  The top 82 is a plate on which the subject P is placed. The base 84 supports the top 82. The base 83 is a housing that supports the base 84 movably in the vertical direction. The bed driving device 81 is a motor or an actuator that moves the subject P into the rotation frame 15 by moving the top 82 on which the subject P is placed in the long axis direction of the top 82. The bed driving device 81 can also move the top 82 in the X-axis direction.

  In addition, as the top board moving method, only the top board 82 may be moved, or the system in which the base 84 of the bed 80 is moved may be used. Further, in the case of standing position CT, a method of moving a patient moving mechanism corresponding to the top 82 may be used.

  The gantry 10 executes, for example, a helical scan in which the subject P is scanned in a helical fashion by rotating the rotation frame 15 while moving the top 82. Alternatively, after moving the top 82, the gantry 10 rotates the rotating frame 15 while fixing the position of the subject P and executes the conventional scan in which the subject P is scanned in a circular orbit. In the following embodiment, although the change of the relative position of mount frame 10 and top plate 82 is explained as what is realized by controlling top plate 82, the embodiment is not limited to this. For example, when the gantry 10 is a self-propelled type, changing the relative position between the gantry 10 and the top 82 may be realized by controlling the traveling of the gantry 10. In addition, by controlling the traveling of the gantry 10 and the top 82, a change in the relative position of the gantry 10 and the top 82 may be realized.

  The console 90 is a device that receives an operation of the X-ray CT apparatus by the operator and reconstructs X-ray CT image data using the counting result acquired by the gantry 10. The console 90 has an input interface 91, a display 92, a memory circuit 95, and a processing circuit 97, as shown in FIG.

  The input interface 91 receives various input operations from the operator, converts the received input operations into electric signals, and outputs the electric signals to the processing circuit 97. For example, the input interface 91 receives, from the operator, acquisition conditions for acquiring projection data, reconstruction conditions for reconstructing a CT image, and image processing conditions for generating a post-processed image from a CT image. . For example, the input interface 91 is realized by a mouse, a keyboard, a trackball, a switch, a button, a joystick, or the like.

  The display 92 displays various information. For example, the display 92 outputs a medical image (CT image) generated by the processing circuit 97, a GUI (Graphical User Interface) for receiving various operations from the operator, and the like. For example, the display 92 is configured of a liquid crystal display, a CRT (Cathode Ray Tube) display, or the like.

  The storage circuit 95 is realized by, for example, a random access memory (RAM), a semiconductor memory device such as a flash memory, a hard disk, an optical disk, or the like. The storage circuit 95 stores, for example, projection data and reconstructed image data.

  The processing circuit 97 executes, for example, a system control function 971, a pre-processing function 972, a reconstruction processing function 973, an image processing function 974, a scan control function 975, and a display control function 976. Here, for example, the system control function 971, the preprocessing function 972, the reconstruction processing function 973, the image processing function 974, the scan control function 975, and the display control function 976 which are components of the processing circuit 97 shown in FIG. The processing functions to be executed are recorded in the storage circuit 95 in the form of a computer-executable program. The processing circuit 97 is, for example, a processor, and reads out each program from the storage circuit 95 and executes the program to implement functions corresponding to each read program. In other words, the processing circuit 97 in the state of reading out each program has each function shown in the processing circuit 97 of FIG.

  The system control function 971 controls various functions of the processing circuit 97 based on the input operation received from the operator via the input interface 91.

  The pre-processing function 972 performs logarithmic conversion processing, offset correction processing, inter-channel sensitivity correction processing, inter-channel gain correction processing, pile-up correction processing, response function correction processing on detection data output from the data acquisition circuit 14 , And performs preprocessing such as beam hardening correction to generate raw data.

  The reconstruction processing function 973 generates X-ray CT image data by performing reconstruction processing using the filter correction back projection method or the successive approximation reconstruction method on the projection data generated by the pre-processing function 972. Do. The reconstruction processing function 973 stores the reconstructed X-ray CT image data in the storage circuit 95. It is to be noted that X-ray CT image data reconstructed from data including all energy information by adding information of all bins for each pixel is also referred to as a "base image".

  Here, the projection data generated from the counting result obtained by the photon counting CT includes information of the energy of the X-ray attenuated by being transmitted through the subject P. Therefore, the reconstruction processing function 973 can, for example, reconstruct X-ray CT image data of a specific energy component. Further, the reconstruction processing function 973 can, for example, reconstruct X-ray CT image data of each of a plurality of energy components.

  Further, the reconstruction processing function 973 assigns, for example, a color tone according to the energy component to each pixel of the X-ray CT image data of each energy component, and superimposes a plurality of X-ray CT image data color-coded according to the energy component. To generate image data. Also, the reconstruction processing function 973 can generate, for example, image data that enables identification of the substance using a substance-specific K absorption edge. Examples of other image data generated by the reconstruction processing function 973 include monochromatic X-ray image data, density image data, effective atomic number image data, and the like.

  Further, as an application of X-ray CT, there is a technology of discriminating the type, the amount, the density, and the like of the substance contained in the subject P by utilizing the fact that the absorption characteristics of the X-ray differ from substance to substance. This is called material discrimination. For example, the reconstruction processing function 973 performs material decomposition on projection data to obtain material decomposition information. Then, the reconstruction processing function 973 reconstructs the material discrimination image using the material discrimination information which is the result of the material decomposition.

  The reconstruction processing function 973 can apply a full scan reconstruction method and a half scan reconstruction method to reconstruct a CT image. For example, in the full scan reconstruction method, the reconstruction processing function 973 requires projection data of 360 degrees around the subject P. In addition, in the half scan reconstruction method, the reconstruction processing function 973 requires projection data for 180 degrees + fan angle. In the following, in order to simplify the description, the reconstruction processing function 973 uses a full scan reconstruction method of reconstructing using 360 degrees of projection data around the subject P around the circumference.

  The image processing function 974 performs, based on a known method, X-ray CT image data generated by the reconstruction processing function 973 based on an input operation received from the operator via the input interface 91, using a known method for tomograms and rendering of arbitrary cross sections. It is converted into image data such as a three-dimensional image by processing. The image processing function 974 stores the converted image data in the storage circuit 95.

  The scan control function 975 controls the CT scan performed on the gantry 10. For example, the scan control function 975 starts the scan on the gantry 10 by controlling the operations of the X-ray high voltage device 11, the X-ray detector 13, the gantry controller 16, the data acquisition circuit 14 and the bed driving device 81. Control the execution of the scan and the end of the scan. Specifically, the scan control function 975 controls acquisition processing of projection data in main imaging (scanning) in which images used for imaging and diagnosis for acquiring positioning images (scano images and scanograms) are acquired.

  Here, the scan control function 975 can capture a two-dimensional scanogram and a three-dimensional scanogram. For example, the scan control function 975 fixes the X-ray tube 12a at a position of 0 degrees (position in the front direction with respect to the subject P) and continuously performs imaging while moving the top 82 at a constant speed. Shoot a two-dimensional scanogram at. Alternatively, the scan control function 975 fixes the X-ray tube 12a at the position of 0 degrees and intermittently repeats the imaging in synchronization with the movement of the table 82 while moving the table 82 intermittently. Take a two-dimensional scanogram. Further, the scan control function 975 can capture a positioning image from an arbitrary direction (for example, a side direction or the like) as well as the front direction with respect to the subject P. For example, when the X-ray tube 12a is imaged at a position of 90 degrees (a position in the side direction with respect to the subject P), imaging from the side of the subject P is performed, and a two-dimensional scanogram is obtained. Note that the position of the X-ray tube 12a can be photographed from any of a plurality of positions if necessary.

  The scan control function 975 captures a three-dimensional scanogram by collecting projection data of the entire circumference of the subject P in the scanogram imaging. For example, the scan control function 975 acquires projection data of the entire circumference of the subject P by helical scan or non-helical scan. Here, the scan control function 975 executes a helical scan or a non-helical scan at a lower dose than the main imaging over a wide area such as the entire chest, entire abdomen, entire upper body, and whole body of the subject P. As the non-helical scan, for example, a step-and-shoot scan is performed.

  The display control function 976 controls to display various image data stored in the storage circuit 95 on the display 92.

  As described above, according to the first embodiment, since the slip bar conductor 52 of the slip bar 50 has the mountain-like shape 53, dust and water drops fall by their own weight. As a result, the slip bar conductor 52 can be prevented from accumulating or accumulating dust or water droplets.

  Further, according to the first embodiment described above, the contact area between the slip bar 50 and the brush 60 is increased by the meshed shape 53 of the slip bar conductor 52 and the slope 63 of the brush conductor 62, and the position It is possible to prevent slippage. As a result, it is possible to significantly reduce the risk of breaking the slip bar insulator 51 and the brush insulator 61 due to the positional deviation between the slip bar 50 and the brush 60. Furthermore, the increase in the contact area between the slip bar conductor 52 and the brush conductor 62 can suppress the voltage drop to a low level.

  Further, according to the embodiment described above, when dust or water droplets adhere to the slip bar conductor 52, the dust or water droplets fall into the groove 54 without accumulating or collecting dust or water droplets on the slip bar conductor 52. As a result, dust and water droplets can be removed simply by cleaning the grooves 54. That is, according to the first embodiment, cleaning can be facilitated.

  Further, according to the above-described embodiment, by providing the partition 55, the operator can not easily insert the limbs into the slip bar 50. That is, it is possible to prevent the insertion of the limbs into the slip bar 50 which is not intended by the worker's carelessness or the like. As a result, the risk of electric shock of the worker can be greatly reduced.

(Other embodiments)
Embodiments are not limited to the above-described embodiments.

  In the first embodiment described above, the slip bar conductor 52 of the slip bar 50 is provided with a mountain shape, and the brush conductor 62 of the brush 60 is provided with a shape engaging with the mountain shape of the slip bar conductor 52 Although described, the embodiment is not limited thereto. For example, the slip bar conductor 52 of the slip bar 50 may be provided with a semicircular shape, and the brush conductor 62 of the brush 60 may be provided with a shape engaging with the semicircular shape of the slip bar conductor 52. FIG. 11 and FIG. 12 are cross-sectional views showing a current-carrying part according to another embodiment.

  In FIG. 11 and FIG. 12, the slip bar 50 and the brush 60 are shown. Further, FIG. 11 shows the case where the slip bar 50 and the brush 60 are not in contact with each other, and FIG. 12 shows the case where the slip bar 50 and the brush 60 are in contact with each other. 11 and 12 are views corresponding to the cross section indicated by broken line BB in FIG. 6 and FIG. In addition, although the case where the slip bar 50 and the brush 60 are non-contact states is shown in FIG. 11 for convenience of explanation, in the medical image diagnostic system 100, the slip bar 50 and the brush 60 are always in a contact state.

  As shown in FIGS. 11 and 12, the slip bar 50 has a slip bar insulator 51 and a slip bar conductor 52. The brush 60 also has a brush insulator 61 and a brush conductor 62. The slip bar 50 is an example of a first energization unit, and the brush 60 is an example of a second energization unit.

  Here, as shown in FIGS. 11 and 12, the slip bar conductor 52 of the slip bar 50 has a semicircular shape 53 a. FIG. 11 illustrates the apexes 56 of the semicircular shape 53 a that each slip bar conductor 52 has. Further, in each slip bar conductor 52, an end portion 57 and an end portion 58 in the horizontal direction in the direction orthogonal to the traveling direction of the gantry 10 are illustrated. As shown in FIG. 11, in the slip bar conductor 52, a straight line (broken line in FIG. 11) connecting two ends (ends 57 and 58), each of the two ends and the slip bar conductor 52 The angles formed with the tangent of the shape connecting the vertex 56 are both 90 degrees or less.

  As the slip bar 50 has the semicircular shape 53 a as described above, dust and water drops fall by their own weight. As a result, the slip bar conductor 52 can be prevented from accumulating or accumulating dust or water droplets.

  In addition, the brush conductor 62 of the brush 60 has a shape 63a that engages with the semicircular shape 53a. That is, the brush 60 has a brush conductor 62 having a shape 63 a that fits with the semicircular shape 53 a of the slip bar 50. When the semicircular shape 53a of the slip bar 50 and the shape 63a of the brush 60 are engaged, the contact area between the slip bar 50 and the brush 60 is increased, and the position can be prevented from shifting. As a result, the positional deviation between the slip bar 50 and the brush 60 can significantly reduce the risk of breaking the slip bar insulator 51 and the brush insulator 61. Furthermore, the increase in the contact area between the slip bar 50 and the brush 60 makes it possible to keep the voltage drop low.

  Further, as shown in FIGS. 11 and 12, the slip bar 50 is provided with a groove 54 on the outside of the slip bar conductor 52. Here, the slip bar 50 may be provided with a groove 54 outside at least one of the two ends of the slip bar conductor 52 in the horizontal direction. The groove 54 is provided vertically lower than the apex 56 of the slip bar conductor 52. Thus, when dust or water droplets adhere to the slip bar conductor 52, the dust or water droplets fall into the grooves 54 without accumulating or collecting the dust or water droplets on the slip bar conductor 52. As a result, dust and water droplets can be removed only by cleaning the groove 54, so cleaning can be facilitated.

  Further, as shown in FIGS. 11 and 12, the slip bar 50 is provided with a partition 55 outside at least one of the two ends of the conductor in the horizontal direction. More specifically, as shown in FIGS. 11 and 12, the slip bar 50 is provided with a partition 55 outside the groove 54 in the horizontal direction. The partition 55 is made of an insulating material. Further, the partition 55 extends at a position higher in the vertical direction than the apex 56 of the slip bar conductor 52. In the brush 60, an area for storing a part of the partition 55 is formed.

  As described above, the slip bar conductor 52 of the slip bar 50 may be provided with a mountain shape, and the brush conductor 62 of the brush 60 may be provided with a shape engaged with the mountain shape of the slip bar conductor 52. The slip bar conductor 52 may be provided with a semicircular shape, and the brush conductor 62 of the brush 60 may be provided with a shape that engages with the semicircular shape of the slip bar conductor 52. Further, the slip bar conductor 52 of the slip bar 50 may be provided with a tapered shape, and the brush conductor 62 of the brush 60 may be provided with a shape engaged with the tapered shape of the slip bar conductor 52.

  Further, in the above-described embodiment, in the slip bar conductor 52 of the slip bar 50, the case where the angles formed by the two end portions and the shape connecting the apex of the slip bar conductor 52 are both 90 degrees or less has been described. However, the embodiment is not limited to this. For example, the slip bar conductor 52 may be provided with a triangular shape, and the brush conductor 62 may be provided with a shape engaged with the triangular shape of the slip bar conductor 52. That is, in the slip bar conductor 52 of the slip bar 50, at least one of the angles formed by the straight line connecting the two ends and the tangent of the shape connecting each of the two ends and the apex of the slip bar conductor 52 is 90 It may be less than or equal to the degree.

  Moreover, although the brush 60 demonstrated electricity supply with the slip bar 50 in the embodiment mentioned above and supplied the electric power from an external power supply to the conveyance part 20 and the gantry 10, embodiment is limited to this is not. The brush 60 may be energized with the slip bar 50 to supply the power from the external power source only to the transport unit 20. In such a case, power is supplied to the gantry 10 in a power feeding system independent of the slip bar 50 and the brush 60.

  Although the embodiment described above is described on the assumption that the medical image diagnostic apparatus is an X-ray CT apparatus, the embodiment is not limited to this, and in the case of a medical image diagnostic apparatus having a gantry, the same applies. It can be applied to For example, MRI (Magnetic Resonance Imaging) apparatus, SPECT (Single Photon Emission Computed Tomography) apparatus, PET (Positron Emission computed Tomography) apparatus, SPECT-CT apparatus in which SPECT apparatus and X-ray CT apparatus are integrated, and PET apparatus The present invention can be similarly applied to a PET-CT apparatus in which an X-ray CT apparatus is integrated, a PET-MRI apparatus in which a PET apparatus and an MRI apparatus are integrated, and the like.

  Moreover, in the embodiment mentioned above, although the case where the mount frame 10 and the conveyance part 20 were provided independently was demonstrated, embodiment is not restricted to this. For example, the transport unit 20 may be incorporated in the gantry 10.

  Moreover, in the embodiment described above, an example in which the number of rails is two has been described, but the embodiment is not limited to this. For example, the number of rails may be one or three or more.

  Moreover, although the case where the groove | channel 54 and the partition 55 are provided in the slip bar 50 was demonstrated in embodiment mentioned above, embodiment is not limited to this. For example, the slip bar 50 may be provided with only one of the groove 54 and the wall 55. Also, the groove 54 and the wall 55 may not be provided in the slip bar 50. Also, one end of the slip bar 50 may be connected to the ground.

  Further, in the embodiment described above, the slip bar 50 is provided with a plurality of slip bar conductors 52 at intervals, but the embodiment is not limited to this. For example, one slip bar conductor 52 may be disposed on the slip bar 50.

  In the embodiment described above, an example was described in which the bed 80 was fixedly installed on a floor surface, but the embodiment is not limited thereto. For example, the bed 80 incorporates a transport unit, or a bed The transport unit may be attached externally. In this case, the bed 80 travels on a rail formed on the floor surface.

  Moreover, in embodiment mentioned above, although the conveyance part 20 demonstrated the case where it ran on the rail 30 by a rack and pinion system, embodiment is not limited to this. For example, the transport unit 20 may have wheels as a drive mechanism and travel on the rail 30 by the wheels. Alternatively, the transport unit 20 may have a screw as a drive mechanism and travel on the rail 30 by the rotation of the screw.

  According to at least one embodiment described above, the floor moat of the rail can be made shallow while securing the electrical robustness and safety of the rail on which the medical image diagnostic apparatus travels.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

DESCRIPTION OF SYMBOLS 10 base 20 conveyance part 30 rail 80 bed 90 console 50 slip bar 52 slip bar conductor 60 brush 62 brush conductor

Claims (12)

A medical image diagnostic apparatus having a gantry;
A transport unit that transports the gantry;
A rail on which the transport unit travels;
A first conducting unit connected to an external power supply and provided on at least a part of the rail;
And at least a part of the conveyance unit, and a second electricity supply unit which supplies electricity to the first electricity supply unit and supplies electric power from the external power supply to at least one of the conveyance unit and the gantry. ,
The first conducting part has a conductor,
In the conductor, a straight line connecting two ends of the conductor, which are two ends of the conductor in a direction perpendicular to the traveling direction of the gantry, and the first end and the first end, respectively. A medical image diagnostic system, wherein at least one of angles formed with a tangent of a shape connecting the apex of the current-carrying portion is 90 degrees or less.   The medical image diagnostic system according to claim 1, wherein the second conducting unit has a conductor having a shape that fits with the shape of the first conducting unit.   3. The medical image diagnostic system according to claim 1, wherein a groove is provided on the outside of at least one end of the two ends of the conductor in the horizontal direction in the first conductive unit.   The medical image diagnostic system according to claim 3, wherein the groove is provided at a position lower in the vertical direction than a top of the first conduction unit.   3. The medical image diagnostic system according to claim 1, wherein a partition wall is provided outside the at least one end of the two ends of the conductor in the horizontal direction in the first conductive unit. 4.   The medical image diagnostic system according to claim 3, wherein a partition wall is provided on the outside of the groove in the horizontal direction in the first conductive unit.   The medical image diagnostic system according to claim 5, wherein the partition extends in a position higher in the vertical direction than a top of the first current-carrying portion.   The medical image diagnostic system according to any one of claims 5 to 7, wherein an area for storing a part of the partition wall is formed in the second electric conduction unit.   The medical image diagnostic system according to any one of claims 1 to 8, wherein the shape of the first conductive unit has a mountain-shaped structure.   The medical image diagnostic system according to any one of claims 1 to 8, wherein the shape of the first conducting unit has a semicircular structure.   The medical image diagnostic system according to any one of claims 1 to 8, wherein the shape of the first conductive unit has a tapered structure.   The medical image diagnostic system according to any one of claims 1 to 11, wherein a plurality of conductors of the first conducting unit are arranged at intervals in the horizontal direction in the first conducting unit.

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