JP2023155451A - Medical diagnostic system and method - Google Patents

Abstract

To improve safety in a medical diagnostic system where a gantry is vertically moved.SOLUTION: A medical diagnostic system includes a gantry, an imaging section, a detection section, and a scan control section. The gantry can be moved in a vertical direction. The imaging section is arranged inside the gantry so as to image a subject. The detection section can detect an object positioned within a movement range of the gantry. The scan control section selects one of modes between a standing position mode for imaging the subject in a standing state and a sitting position mode for imaging the subject in a sitting state in response to a detection result by the detection section.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to medical diagnostic systems and methods.

BACKGROUND ART Conventionally, in medical diagnostic systems such as CT apparatuses that image subjects in various body positions such as standing and sitting positions, techniques are known for reducing contact with the subject when a gantry moves up and down. For example, by installing a protective member such as a cylindrical area cover with a diameter smaller than the gantry's inner diameter on the floor to prevent the subject from protruding from the gantry's inner diameter, it is possible for the gantry and the subject to come into contact. There are techniques to reduce this. Furthermore, in a device that images a subject in an upright position, a technique is known in which a sensor or the like is used to detect that the subject protrudes from the inner diameter of a gantry.

JP2017-077457A

The problem to be solved by the present invention is to improve the safety in a medical diagnostic system in which a gantry moves up and down.

The medical diagnostic system according to the embodiment includes a gantry, an imaging section, a detection section, and a scan control section. The gantry is movable in the vertical direction. The imaging unit is provided within the gantry and is capable of imaging the subject. The detection unit is capable of detecting objects located within the movement range of the gantry. The scan control unit selects either a standing mode for imaging a subject in a standing position or a sitting mode for imaging a subject in a sitting position, depending on the detection result by the detection unit.

FIG. 1 is a block diagram showing an example of the configuration of a standing CT system according to the first embodiment. FIG. 2 is a diagram showing an example of the operation of the gantry according to the first embodiment. FIG. 3 is a block diagram showing an example of the configuration of the control device according to the first embodiment. FIG. 4 is an example of a top view of the gantry and struts according to the first embodiment. FIG. 5 is an example of a top view of the first detection range according to the first embodiment. FIG. 6 is a diagram showing an example of a laser beam projected in the standing mode according to the first embodiment. FIG. 7 is an example of a top view of the second detection range according to the first embodiment. FIG. 8 is a diagram showing an example of laser light projected in the sitting mode according to the first embodiment. FIG. 9 is a flowchart illustrating an example of the flow of object detection processing executed by the standing CT system according to the first embodiment. FIG. 10 is a diagram showing an example of a notification screen according to the first embodiment. FIG. 11 is a diagram showing another example of the notification screen according to the first embodiment. FIG. 12 is a block diagram showing an example of the configuration of a standing CT system according to the second embodiment. FIG. 13 is a block diagram showing an example of the configuration of a control device according to the second embodiment. FIG. 14 is a flowchart illustrating an example of the flow of object detection processing executed by the standing CT system according to the second embodiment. FIG. 15 is a diagram showing an example of the installation position of the load sensor according to the third embodiment.

Hereinafter, embodiments of the medical diagnostic system will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing the configuration of a standing CT (Computed Tomography) system 1 according to the present embodiment. The standing CT system 1 is an X-ray CT system, and is an example of a medical diagnostic system in this embodiment.

The standing CT system 1 is capable of imaging the subject P. Furthermore, the standing CT system 1 of this embodiment can image the subject P in a plurality of different body positions. Specifically, the standing CT system 1 of the present embodiment has two modes: a "standing mode" in which the subject P is imaged in an upright position (hereinafter referred to as an upright state), and a "standing mode" in which the subject P is imaged in a sitting position (hereinafter referred to as a standing state). There are two types of imaging modes: a "sitting position mode" in which images are taken in a sitting position (hereinafter referred to as a sitting position). The standing state is a state in which the subject P stands up on the floor 5. Further, the sitting state is a state in which the subject P is sitting in a wheelchair or a chair (hereinafter referred to as a wheelchair or the like).

As shown in FIG. 1, the standing CT system 1 according to this embodiment includes a gantry device 10 and a console device 40. The gantry device 10 and the console device 40 may be installed in different rooms. The room in which the console device 40 is installed is called a console room. During imaging by the standing CT system 1, an operator such as a technician is in the console room.

The console device 40 has a memory 41, a display 42, an input interface 43, and a processing circuit 44. Although the console device 40 will be described as being separate from the gantry device 10, the gantry device 10 may include the console device 40 or a part of each component of the console device 40.

The memory 41 is realized by, for example, a RAM (Random Access Memory), a semiconductor memory element such as a flash memory, a hard disk, an optical disk, or the like. The memory 41 stores, for example, projection data and CT image data. Further, for example, the memory 41 stores a program for the circuits included in the standing CT system 1 to realize their functions. Note that the memory 41 may be realized by a server group (cloud) connected to the standing CT system 1 via a network.

The display 42 displays various information. For example, the display 42 displays various images generated by the processing circuit 44 and displays a GUI (Graphical User Interface) for accepting various operations from an operator. The display 42 is, for example, a liquid crystal display or a CRT (Cathode Ray Tube) display. The display 42 may be of a desktop type, or may be composed of a tablet terminal or the like that can communicate wirelessly with the main body of the console device 40. Further, the display 42 may be provided on the gantry device 10.

The display 42 of this embodiment displays, for example, a selection screen that allows the operator to select either standing mode or sitting mode. Further, the display 42 of this embodiment displays, for example, a notification screen that notifies the operator of the detection result by the laser sensor 3, which will be described later. The display 42 is also referred to as a display section.

The input interface 43 receives various input operations from an operator, converts the received input operations into electrical signals, and outputs the electrical signals to the processing circuit 44 . For example, the input interface 43 receives input operations from the operator, such as reconstruction conditions when reconstructing CT image data and image processing conditions when generating post-processed images from CT image data.

For example, the input interface 43 may include a mouse, a keyboard, a trackball, a switch, a button, a joystick, a touchpad that performs input operations by touching the operation surface, a touchscreen that integrates a display screen and a touchpad, and an optical sensor. This is realized by using a non-contact input circuit, a voice input circuit, etc. Note that the input interface 43 may be provided in the gantry device 10. Furthermore, the input interface 43 may be configured with a tablet terminal or the like that can communicate wirelessly with the main body of the console device 40.

Furthermore, the input interface 43 is not limited to one that includes physical operation parts such as a mouse and a keyboard. For example, an electric signal processing circuit that receives an electric signal corresponding to an input operation from an external input device provided separately from the console device 40 and outputs this electric signal to the processing circuit 44 is also an example of the input interface 43. included.

The processing circuit 44 controls the operation of the entire standing CT system 1 . For example, the processing circuit 44 includes a scan control function 441, an image generation function 442, and a display control function 443. The scan control function 441 is an example of a scan control section. The image generation function 442 is an example of an image generation section. The display control function 443 is an example of a display control section.

The scan control function 441 controls various functions of the processing circuit 44 based on input operations received from the operator via the input interface 43. Further, the scan control function 441 controls the CT scan performed by the gantry device 10. For example, the scan control function 441 controls the projection data collection process in the gantry device 10 by controlling the X-ray tube device 11, the X-ray detector 12, the X-ray high voltage device 14, the control device 15, and the DAS 18. do. Further, for example, when the scan control function 441 receives a selection operation of standing mode or sitting mode from the operator, it notifies the control device 15 of the gantry device 10 of the selected mode.

The image generation function 442 generates data by subjecting the detected data output from the DAS 21 to pre-processing such as logarithmic conversion processing, offset correction processing, inter-channel sensitivity correction processing, and beam hardening correction. Note that the data before preprocessing (detected data) and the data after preprocessing may be collectively referred to as projection data. Further, for example, the image generation function 442 generates CT image data. Specifically, the image generation function 442 generates CT image data by performing reconstruction processing on the preprocessed projection data using a filtered back projection method, a successive approximation reconstruction method, or the like. Further, the image generation function 442 converts CT image data into tomographic image data of an arbitrary cross section or three-dimensional image data based on input operations received from the operator via the input interface 43.

The display control function 443 displays CT images or various image data on the display 42. Further, the display control function 443 displays, for example, a selection screen for standing mode or sitting mode, a detection result notification screen, etc. on the display 42.

In the standing CT system 1 shown in FIG. 1, each processing function is stored in the memory 41 in the form of a computer-executable program. The processing circuit 44 is a processor that reads programs from the memory 41 and executes them to implement functions corresponding to each program. In other words, the processing circuit 44 in a state where each program has been read has a function corresponding to the read program.

Note that although FIG. 1 shows a case where each processing function of the scan control function 441, image generation function 442, and display control function 443 is realized by a single processing circuit 44, the embodiment is limited to this. It's not a thing. For example, the processing circuit 44 may be configured by combining a plurality of independent processors, and each processor may implement each processing function by executing each program. Further, each processing function of the processing circuit 44 may be appropriately distributed or integrated into a single processing circuit or a plurality of processing circuits.

The gantry device 10 includes an X-ray tube device 11, an X-ray detector 12, a gantry 13, an X-ray high voltage device 14, a control device 15, a wedge 16, a collimator 17, and a DAS (Data Acquisition System). 18, light projecting parts 30a to 30n, pillars 19a and 19b, and a horizontal member 20. Further, light receiving sections 31a to 31n are provided on the floor surface 5 on which the gantry device 10 is installed.

The pillars 19a and 19b (hereinafter simply referred to as the pillar 19 unless otherwise specified) are provided perpendicularly to the floor surface 5 and support the gantry 13. Furthermore, a control device 15 is provided inside the support column 19 . The support column 19 includes, for example, drive mechanisms 191a and 191b (hereinafter simply referred to as the drive mechanism 191 unless otherwise distinguished) that move the gantry 13 in the vertical direction, and a rail (not shown) that extends in the vertical direction.

The drive mechanism 191 includes, for example, a motor and an actuator, and moves or stops the gantry 13 under control from the control device 15. Further, the drive mechanism 191 may have a function of rotating the rotating frame within the gantry 13 under control from the control device 15.

The horizontal member 20 is a member that is horizontal to the floor surface 5 and is passed between the pillars 19a and 19b.

The gantry 13 includes an X-ray tube device 11, an X-ray detector 12, a gantry 13, an X-ray high voltage device 14, a control device 15, a wedge 16, a collimator 17, and a DAS (Data Acquisition System). ) 18. Further, the gantry 13 has a cylindrical cavity 131. Since the cavity 131 vertically passes through the gantry 13, openings are provided at the top and bottom of the gantry 13, respectively. The gantry 13 is also referred to as a gantry dome or a gantry body. Note that in the present embodiment, the term "cylindrical" includes an elliptical cross section perpendicular to the axis of the cylinder. Further, the term "circular" also includes an elliptical shape.

The gantry 13 is movable in the vertical direction, and is moved up and down on a rail provided on the support column 19, for example, by a drive mechanism 191. For example, the gantry 13 accommodates the subject P from a lower opening. Note that the means for moving the gantry 13 is not limited to the example shown in FIG. Further, in FIG. 1, the drive mechanism 191 is provided on the support column 19, but it may be provided on the gantry 13.

Here, the operation of the gantry 13 will be explained using FIG. 2. FIG. 2 is a diagram showing an example of the operation of the gantry 13 according to this embodiment.

When the gantry 13 is not used for imaging, it is located above, as shown in the leftmost diagram in FIG. In this state, the subject P moves to the imaging possible range 132 located below the center of the gantry 13.

Further, the center diagram in FIG. 2 shows a state in which the gantry 13 has been lowered to approximately the center position in the vertical direction of the support column 19. The movement of the gantry 13 to this state is called a "half stroke."

Further, the rightmost diagram in FIG. 2 shows a state in which the gantry 13 has been lowered to the lower limit position in the vertical direction. The movement of the gantry 13 to this state is called a "full stroke."

The movement range of the gantry 13 differs depending on the body position of the subject P. In the standing mode, the range of movement of the gantry 13 is a full stroke, and in the sitting mode, the range of movement of the gantry 13 is a half stroke.

The imaging possible range 132 is a range in which the subject P should be positioned during imaging in the standing mode, and is also referred to as the standing position of the subject P. The position of the imaging possible range 132 on the floor surface 5 is a position facing the opening of the cavity 131 of the gantry 13. Further, the diameter of the imaging possible range 132 is less than or equal to the diameter of the cavity 131 of the gantry 13. When the subject P in an upright position is located in the imaging possible range 132 and the gantry 13 moves a full stroke, the whole body of the subject P enters the cavity 131.

Further, when imaging in the sitting mode, the subject P is located in the imaging possible range 132 while sitting in a wheelchair or the like. In this case, even if the subject P is located at the center of the imageable range 132, the legs or wheelchair of the subject P may go outside the imageable range 132. Therefore, when imaging in the sitting mode, the gantry 13 does not move in a full stroke, but moves in a half stroke.

When the subject P is in a sitting position and the gantry 13 moves by a half stroke, the upper body of the subject P enters the cavity 131. In addition, when the gantry 13 stops at the lowest position in the half stroke, the height of the lowest part of the gantry 13 is such that it does not come into contact with the wheelchair, etc., or the legs of the subject P sitting in the wheelchair, etc. Assume that there is.

Returning to FIG. 1, the X-ray tube device 11 includes an X-ray tube and a deflection section. An X-ray tube is a vacuum tube that has a cathode (filament) that generates electrons and an anode (target) that generates X-rays upon collision with thermoelectrons. The X-ray tube irradiates the subject P by applying a high voltage from the X-ray high voltage device 14 to irradiate thermoelectrons from the cathode to the anode and emitting X-rays at the focal point of the anode. Generates X-rays that For example, there is a rotating anode type X-ray tube that generates X-rays by irradiating a rotating anode with thermoelectrons.

The deflection unit deflects the thermoelectrons irradiated from the cathode, thereby changing the incident direction of the thermoelectrons and changing the position of the focal point on the anode. That is, the deflection section changes the direction of the X-rays emitted from the anode.

The X-ray detector 12 has a plurality of detection elements that detect X-rays. Each detection element in the X-ray detector 12 detects the X-rays irradiated from the X-ray tube device 11 and passed through the subject P, and outputs a signal corresponding to the detected X-ray dose to the DAS 18.

The X-ray tube device 11 and the X-ray detector 12 are supported by a rotating frame within the gantry 13, and rotate around the cavity 131 to irradiate the subject P with X-rays and pass through the subject P. Detection of X-rays may also be performed.

The X-ray high voltage device 14 has an electric circuit such as a transformer and a rectifier, and includes a high voltage generator that generates a high voltage to be applied to the X-ray tube device 11 and a high voltage generated by the X-ray tube device 11. and an X-ray control device that controls the output voltage according to the X-rays. The high voltage generator may be of a transformer type or an inverter type.

The wedge 16 is a filter for adjusting the amount of X-rays irradiated from the X-ray tube device 11. Specifically, the wedge 16 transmits the X-rays emitted from the X-ray tube device 11 so that the X-rays emitted from the X-ray tube device 11 to the subject P have a predetermined distribution. It is a filter that attenuates by For example, the wedge 16 is a wedge filter or a bow-tie filter, and is a filter made of aluminum or the like so as to have a predetermined target angle and a predetermined thickness.

The collimator 17 is a lead plate or the like for narrowing down the irradiation range of the X-rays that have passed through the wedge 16, and forms a slit by combining a plurality of lead plates or the like. Note that the collimator 17 is sometimes called an X-ray diaphragm. Furthermore, although FIG. 1 shows a configuration in which the wedge 16 is disposed between the X-ray tube device 11 and the collimator 17, a configuration in which the collimator 17 is disposed between the X-ray tube device 11 and the wedge 16 is different. It's okay.

The DAS 18 collects X-ray signals detected by each detection element included in the X-ray detector 12. For example, the DAS 18 includes an amplifier that performs amplification processing on the electrical signal output from each detection element and an A/D converter that converts the electrical signal into a digital signal, and generates detection data. DAS18 is realized by a processor, for example.

The data generated by the DAS 18 is transferred to the console device 40 via a transmitter and a receiver provided in the gantry 13. For example, optical communication can be used as the communication means between the DAS 18 and the transmitter and receiver, but other non-contact data transmission methods or contact data transmission methods may also be used.

Note that the X-ray tube device 11 and the X-ray detector 12 are an example of an imaging section in this embodiment. Alternatively, the X-ray tube device 11, the X-ray detector 12, the X-ray high voltage device 14, the wedge 16, the collimator 17, and the DAS 18 may be used as an example of the imaging section. Each of the above-mentioned components constituting the imaging unit images the subject P in a standing state in the case of the standing mode, and images the subject P in the sitting state in the case of the sitting mode.

The light projecting sections 30a to 30n (hereinafter simply referred to as the light projecting section 30 unless otherwise specified) are provided in the gantry 13. For example, the light projectors 30a to 30n are installed along the opening of the gantry 13. More specifically, the light projectors 30a to 30n are installed in a circular shape on the inner wall of the gantry 13 facing the cavity 131 so as to surround the cavity 131. Further, the light projecting units 30a to 30n project laser beams 32a to 32n (hereinafter simply referred to as laser beams 32 unless otherwise specified) downward. Note that although the laser beam 32 is shown in FIG. 1 for explanation, the laser beam 32 does not have to be visible light.

The light receiving sections 31a to 31n are installed on the floor surface 5 along a circular range obtained by projecting the opening of the gantry 13 onto the floor surface 5. The light receiving units 31a to 31n receive the laser beams 32a to 32n sent from the light projecting units 30a to 30n, and send the light reception results to the control device 15.

The light projecting sections 30a to 30n and the light receiving sections 31a to 31n constitute laser sensors 3a to 3n. Specifically, each of the light projecting parts 30a to 30n is paired with each of the light receiving parts 31a to 31n (hereinafter simply referred to as the light receiving part 31 unless otherwise distinguished) installed on the floor surface 5, A pair of light projecting section 30 and light receiving section 31 constitute one laser sensor 3.

In the example shown in FIG. 1, a light projecting section 30a and a light receiving section 31a facing the light projecting section 30a constitute one laser sensor 3a, and a light projecting section 30n and a light receiving section 31n facing the light projecting section 30n. constitute one laser sensor 3n. That is, the laser sensors 3a to 3n are installed along the opening of the gantry 13. The laser sensor 3 is an example of a detection unit in this embodiment. Note that the individual laser sensors 3a to 3n may be used as an example of a detection section, or all the laser sensors 3a to 3n may be collectively referred to as one detection section. Note that the light projecting section 30 provided in the gantry 13 may be used as an example of the detecting section.

The laser sensor 3 is capable of detecting objects located within the movement range of the gantry 13, and changes the detection range depending on the body position of the subject P. More specifically, the laser sensor 3 detects an object located below the gantry 13 before the gantry 13 starts descending. In this embodiment, the term "object" includes the subject P. Specifically, the laser sensor 3 detects an object located between the light projector 30 and the light receiver 31.

For example, when there is no object between the light projecting section 30a and the light receiving section 31a, the light receiving section 31a receives the laser beam 32a projected by the light projecting section 30a. If an object exists between the light projector 30a and the light receiver 31a, the laser beam 32a is blocked, so the light receiver 31a does not receive the laser light 32a projected by the light projector 30a. Note that the numbers of the light projecting section 30, the light receiving section 31, and the laser sensors 3 are not particularly limited. Further, the method of detecting an object using the laser sensor 3 can be a known technique and is not particularly limited.

In the example shown in FIG. 1, the light receiving section 31 is embedded in the floor surface 5, and the floor surface 5 and the surface of the light receiving section 31 are in a flat state without any level difference. Note that the installation mode of the light receiving section 31 is not limited to this.

Further, each of the laser sensors 3a to 3n can be individually switched between a valid state and a disabled state under the control of the control device 15. The laser sensor 3 in the disabled state does not detect objects. Therefore, the detection range of the laser sensors 3a to 3n changes depending on which of the laser sensors 3a to 3n the control device 15 makes effective. Details of changing the detection range according to the body position of the subject P will be described later.

The control device 15 controls the operation of the gantry 13 by controlling the drive mechanism 191 based on detection results by the laser sensor 3 or instructions from the console device 40 . Although the control device 15 is provided on the support column 19 in FIG. 1, the control device 15 may be provided on the gantry 13 or the console device 40.

Next, details of the functions of the control device 15 will be explained. FIG. 3 is a block diagram showing an example of the configuration of the control device 15 according to this embodiment.

As shown in FIG. 3, the control device 15 includes a memory 151 and a processing circuit 152. Note that the control device 15 may further include a display or an input interface.

The memory 151 is realized by, for example, a RAM, a semiconductor memory device such as a flash memory, a hard disk, an optical disk, or the like. The memory 151 stores, for example, a program for a circuit included in the control device 15 to realize its functions.

The processing circuit 152 includes an acquisition function 1521 , a detection control function 1522 , a movement control function 1523 , and a notification function 1524 . The acquisition function 1521 is an example of an acquisition unit. The detection control function 1522 is an example of a detection control section. The movement control function 1523 is an example of a movement control section. The notification function 1524 is an example of a notification section. Note that the processing circuit 152 may be used as an example of a movement control section, or the control device 15 may be used as an example of a movement control section.

In the control device 15, each processing function is stored in the memory 151 in the form of a computer-executable program. The processing circuit 152 is a processor that reads programs from the memory 151 and executes them to implement functions corresponding to each program. In other words, the processing circuit 152 in a state where each program has been read has a function corresponding to the read program.

Note that although FIG. 3 shows a case where the processing functions of the acquisition function 1521, the detection control function 1522, the movement control function 1523, and the notification function 1524 are realized by a single processing circuit 152, the embodiment It is not limited to. For example, the processing circuit 152 may be configured by combining a plurality of independent processors, and each processor may implement each processing function by executing each program. Further, each processing function of the processing circuit 44 may be appropriately distributed or integrated into a single processing circuit or a plurality of processing circuits.

The acquisition function 1521 acquires various control signals from the console device 40. For example, the acquisition function 1521 acquires a control signal that instructs movement of the gantry 13 upon starting imaging. When the acquisition function 1521 acquires a control signal instructing the movement of the gantry 13, it sends the instruction to move the gantry 13 to the detection control function 1522 and the movement control function 1523.

The acquisition function 1521 also acquires from the console device 40 a signal that notifies the mode selection result, that is, whether the standing mode or the sitting mode has been selected by the operator. Alternatively, the acquisition function 1521 may acquire from the console device 40 a signal instructing either a full stroke or a half stroke. When acquiring the mode selection result, the acquisition function 1521 sends the acquired mode selection result to the detection control function 1522 and the movement control function 1523.

Furthermore, the acquisition function 1521 acquires detection results from the laser sensor 3. The acquisition function 1521 sends the acquired detection results to the movement control function 1523 and the notification function 1524.

The detection control function 1522 changes the detection range of the laser sensor 3 according to the body position of the subject P. More specifically, the detection control function 1522 switches the laser sensor 3 between the valid state and the invalid state according to the movement instruction of the gantry 13 and the mode selection result acquired by the acquisition function 1521. For example, it is assumed that all laser sensors 3 are in an invalid state before receiving an instruction to move the gantry 13, that is, in normal times. Then, when receiving an instruction to move the gantry 13, the detection control function 1522 switches all or some of the laser sensors 3 to the valid state according to the mode selection result.

Here, details of changing the detection range according to the body position of the subject P will be explained using FIGS. 4 to 8. FIG. 4 is an example of a top view of the gantry 13 and the support column 19 according to this embodiment.

In the example shown in FIG. 4, twelve light projectors 30a to 30l are installed in a circle along the opening of the gantry 13 so as to surround the cavity 131. In FIG. 4, the upper side indicates the front direction of the gantry apparatus 10, and the lower side indicates the rear direction of the gantry apparatus 10. Note that the number and installation positions of the light projecting units 30 shown in FIG. 4 are merely examples, and the present invention is not limited thereto. Although not shown in FIG. 4, it is assumed that twelve light receiving sections 31 corresponding to each of the light projecting sections 30a to 30l are provided on the floor surface 5. That is, twelve laser sensors 3a to 3l are installed in a circle along the opening of the gantry 13 so as to surround the cavity 131.

First, the case of standing mode will be explained. The detection control function 1522 enables all 12 laser sensors 3a to 3l in the standing mode. In this case, a cylindrical spatial region along the opening of the gantry 13 in the space between the gantry 13 and the floor surface 5 becomes the detection range. This detection range is referred to as a first detection range.

FIG. 5 is an example of a top view of the first detection range 301 according to this embodiment. As shown in FIG. 5, the first detection range 301 has a circular shape surrounding the cavity 131 when viewed from above. In the case of the standing mode, the laser sensor 3 detects an object such as the subject P located in the first detection range 301 below the gantry 13.

FIG. 6 is a diagram showing an example of the laser beam 32 projected in the standing mode according to the present embodiment. In FIG. 6, the subject P is positioned in an upright position on the floor 5 within the imageable range 132. The laser beams 32 (laser beams 32a, 32b, 32i, 32j, and 32k are shown in FIG. 6) irradiated from the light projectors 30a to 30l enter the first detection range 301 surrounding the imaging possible range 132. It is illuminated. If the body of the subject P is outside the imaging range 132, the body of the subject P blocks the laser beam 32, and the laser sensor 3 detects the object (the subject P) in the first detection range 301. ) is detected.

Next, the case of sitting mode will be explained. In the sitting mode, the detection control function 1522 enables some of the 12 laser sensors 3a to 3l and leaves the rest in an ineffective state.

Specifically, the detection control function 1522 activates the laser sensor 3 located in the left-right direction of the subject P among the laser sensors 3a to 3l. Further, the detection control function 1522 disables the laser sensor 3 located in the front and rear directions (front direction and rear direction) of the subject P. This is because when the subject P is in a sitting state, parts of the subject P's legs, wheelchair, etc. protrude in the front-rear direction of the subject P, and therefore protrude from the imaging possible range 132. That is, in the case of a sitting state, in the front-back direction of the subject P, even if the subject P is in a normal standing position, there may be a part of the subject P's body or other objects outside the imaging range 132. Therefore, it is not detected by the laser sensor 3. Further, in the left-right direction of the subject P, even if the subject P is in a sitting position, it is normal that no part of the subject P's body or other objects exist outside the imaging possible range 132. Therefore, the detection control function 1522 enables the laser sensors 3 in the left and right directions of the subject P even in the sitting mode.

For example, when the subject P is imaged in a sitting state facing the front direction of the gantry device 10 (above the drawing 4), the detection control function 1522 uses the laser sensors 3l, 3a, 3b, 3f. , 3g, and 3h (laser sensors 3 with diagonal lines in FIG. 4) are enabled. Furthermore, the detection control function 1522 leaves the laser sensors 3i, 3j, 3k, 3e, 3d, and 3c (laser sensors 3 marked with dots in FIG. 4) in an invalid state. In this case, of the cylindrical spatial region along the opening of the gantry 13 in the space between the gantry 13 and the floor surface 5, the range that can be detected by the laser sensor 3 in the effective state becomes the detection range. This detection range is referred to as a second detection range.

FIG. 7 is an example of a top view of the second detection range 302 according to this embodiment. As shown in FIG. 7, the second detection range 302 is an area from which a part of the first detection range 301 shown in FIG. 5 is excluded. More specifically, the second detection range 302 is an area in which a portion of the first detection range 301 located in the front-back direction of the subject P is excluded. In other words, the second detection range is a part of the first detection range.

FIG. 8 is a diagram showing an example of the laser beam 32 projected in the sitting mode according to the present embodiment. In FIG. 8, the subject P is sitting on the wheelchair 6 facing the front direction of the gantry device 10. As shown in FIG. 8, the legs of the subject P and a portion of the wheelchair 6 are outside the imaging range 132. However, in the sitting mode, the gantry 13 operates not in a full stroke but in a half stroke, so it comes into contact with the legs of the subject P and part of the wheelchair 6 that are outside the imaging range 132 shown in FIG. Do not descend to that position.

The laser beams 32 (in FIG. 8, laser beams 32l, 32a, 32b, 32g, 32h are shown) irradiated from the light projecting parts 30l, 30a, 30b, 30f, 30g, and 30h in the active state cause the second detection Light is projected onto a range 302. If the body of the subject P is outside the imaging range 132 in the left-right direction, for example, if the position of the wheelchair 6 is shifted from the imaging range 132 in the left-right direction, When P's body or the wheelchair 6 blocks the laser beam 32, the laser sensor 3 detects the presence of an object (including the subject P) in the second detection range 302.

In FIGS. 4, 7, and 8, the case where the subject P is imaged in a sitting position facing the front direction of the gantry apparatus 10 has been described, but the orientation of the subject P is not limited to this. For example, the subject P may be in a sitting position, facing the pillars 19a or 19b of the gantry device 10 (that is, with the front direction of the gantry device 10 facing the left-right direction of the subject P). . In this case, the detection control function 1522 enables the laser sensors 3i, 3j, 3k, 3e, 3d, and 3c located on the left and right sides of the subject P. Furthermore, the detection control function 1522 disables the laser sensors 3l, 3a, 3b, 3f, 3g, and 3h located in the front-rear direction of the subject P. Further, the subject P may be in a sitting position, facing diagonally with respect to the front direction of the gantry device 10.

The orientation of the subject P in the sitting mode may be input by the operator from the input interface 43, for example. In this case, the acquisition function 1521 acquires the orientation of the subject P from the console device 40 and sends it to the detection control function 1522.

Returning to FIG. 3, the movement control function 1523 controls the movement of the gantry 13 according to the movement instruction of the gantry 13 acquired by the acquisition function 1521, the mode selection result, and the detection result by the laser sensor 3. For example, the movement control function 1523 includes an interlock function that does not permit movement of the gantry 13 when an object is detected within a detection range depending on the body position of the subject P.

Specifically, even if the movement control function 1523 receives an instruction to move the gantry 13 in the standing mode, if an object located in the first detection range 301 is detected by the laser sensor 3, Do not move the gantry 13. Furthermore, in the standing mode, when an object located in the first detection range 301 is not detected by the laser sensor 3, the movement control function 1523 controls the drive mechanism 191 according to the instruction to move the gantry 13. , moves the gantry 13. In this case, the movement control function 1523 moves the gantry 13 up and down with a full stroke, for example.

Furthermore, even if an instruction to move the gantry 13 is received in the sitting mode, if an object located in the second detection range 302 is detected by the laser sensor 3, the movement control function 1523 controls the movement of the gantry. Do not move 13. Furthermore, in the sitting mode, if the object located in the second detection range 302 is not detected by the laser sensor 3, the movement control function 1523 controls the drive mechanism 191 according to the instruction to move the gantry 13. Move the gantry 13. In this case, the movement control function 1523 moves the gantry 13 up and down in a half stroke, for example.

The notification function 1524 notifies that an object has been detected in the first detection range 301 or the second detection range 302 based on the detection result by the laser sensor 3 acquired by the acquisition function 1521. Specifically, the notification function 1524 transmits the position where the object is detected in the first detection range 301 or the second detection range 302 to the console device 40 based on the detection result by the laser sensor 3. For example, the notification function 1524 transmits to the console device 40 information specifying the laser sensor 3 that has detected the object among the laser sensors 3a to 3n that are in a valid state.

The word "processor" used in the description of the console device 40 and the control device 15 above refers to, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or an Application Specific Integrated Circuit (Application Specific Integrated Circuit). ASIC), programmable logic devices (e.g., Simple Programmable Logic Device (SPLD), Complex Programmable Logic Device (CPLD), and Field Programmable Gate Array (FPGA)), etc. circuit. Note that instead of storing the program in the memory 41 or the memory 151, the program may be directly incorporated into the circuit of the processor. In this case, the processor realizes its functions by reading and executing a program built into the circuit.

Next, the flow of object detection processing executed in the standing CT system 1 of this embodiment configured as described above will be described.

FIG. 9 is a flowchart showing an example of the flow of object detection processing executed by the standing CT system 1 according to the present embodiment. The processing in this flowchart starts, for example, when the input interface 43 of the console device 40 receives an operation by the operator to start imaging.

The acquisition function 1521 of the control device 15 acquires an instruction to move the gantry 13 and a mode selection result from the console device 40 (S1). The acquisition function 1521 sends the acquisition results to the detection control function 1522 and the movement control function 1523.

The detection control function 1522 determines whether the mode selection result acquired by the acquisition function 1521 is standing mode or sitting mode (S2).

When the detection control function 1522 determines that the standing mode has been selected (S2 "standing mode"), it enables all laser sensors 3 (S3). For example, as in the example described with reference to FIG. 4, the detection control function 1522 enables all 12 laser sensors 3a to 3l.

Then, the acquisition function 1521 acquires detection results from the laser sensors 3a to 3l (S4). The acquisition function 1521 sends the acquired detection results to the movement control function 1523 and the notification function 1524.

Then, the movement control function 1523 determines whether the laser sensors 3a to 3l have detected an object in the first detection range 301, which is the detection range of the laser sensors 3a to 3l (S5).

If any of the laser sensors 3a to 3l has detected an object, the movement control function 1523 determines that the object has been detected in the first detection range 301 (S5 "Yes"). In this case, the movement control function 1523 does not permit movement of the gantry 13 (S6).

Furthermore, the notification function 1524 notifies that an object has been detected within the first detection range 301 based on the detection result by the laser sensor 3 acquired by the acquisition function 1521 (S7). For example, the notification function 1524 transmits information identifying the laser sensor 3 that detected the object among the laser sensors 3a to 3l to the console device 40 as a detection result. In this case, the display control function 443 of the console device 40 displays a notification screen based on the detection result on the display 42.

FIG. 10 is a diagram showing an example of the notification screen 420 according to the present embodiment. As shown in FIG. 10, the display control function 443, for example, among the laser sensors 3a to 3l in the valid state, distinguishes the laser sensors 3k and 3l that have detected an object from the laser sensors 3a to 3j that have not detected an object. Display in different manners. The display control function 443 may display the laser sensors 3k and 3l that have detected the object by changing their colors, or may cause them to blink. Furthermore, the display control function 443 may display a message on the notification screen 420 informing the operator that movement of the gantry 13 is not permitted because an object has been detected within the first detection range 301.

Note that the notification screen 420 is not limited to the example shown in FIG. A still image or a moving image including the range 301 may be displayed on the notification screen 420. In this case, the operator can visually confirm on the notification screen 420 what kind of object is present at what position within the first detection range 301 .

After the processing in S7, the process returns to S4, and the processing in S4 to S7 is repeated until no object is detected in the first detection range 301. Note that the process of this flowchart may be stopped after the process of S7, and resumed when a restart operation is received by the operator.

Further, if none of the laser sensors 3a to 3l detects an object, the movement control function 1523 determines that no object is detected in the first detection range 301 (S5 "No"). In this case, the movement control function 1523 permits movement of the gantry 13 (S8).

Then, if the standing mode is selected, the movement control function 1523 moves the gantry 13 with a full stroke (S9). In this case, the gantry 13 is lowered to the lower limit position, as shown in the rightmost diagram of FIG.

Then, the scan control function 441 of the console device 40 controls the projection data collection process in the gantry device 10, and executes the imaging process to image the subject P in the standing state (S10).

After the imaging process is completed, the movement control function 1523 raises the gantry 13 and returns it to its original position (S11).

Further, when the detection control function 1522 determines that the sitting mode has been selected (S2 "sitting mode"), it enables some of the laser sensors 3 (S3). For example, as in the example described in FIG. 4, the detection control function 1522 controls the laser sensors 3l, 3a, 3b, 3f, 3g, which are located in the left and right direction of the subject P, among the 12 laser sensors 3a to 3l. 3h is enabled. Furthermore, the detection control function 1522 leaves the laser sensors 3i, 3j, 3k, 3e, 3d, and 3c located in the front-back direction of the subject P in an invalid state.

Then, the acquisition function 1521 acquires detection results from the laser sensors 3l, 3a, 3b, 3f, 3g, and 3h in the valid state (S13). The acquisition function 1521 sends the acquired detection results to the movement control function 1523 and the notification function 1524.

The movement control function 1523 then detects an object within the second detection range 302, which is the detection range of the laser sensors 3l, 3a, 3b, 3f, 3g, and 3h. It is determined whether or not it has been detected (S14).

If any of the laser sensors 3l, 3a, 3b, 3f, 3g, and 3h has detected an object, the movement control function 1523 determines that an object within the second detection range 302 has been detected (S14 “Yes”). In this case, the movement control function 1523 does not permit movement of the gantry 13 (S15).

Furthermore, the notification function 1524 notifies that an object has been detected within the second detection range 302 based on the detection result by the laser sensor 3 acquired by the acquisition function 1521 (S16). For example, the notification function 1524 transmits information identifying the laser sensor 3 that has detected the object among the laser sensors 3l, 3a, 3b, 3f, 3g, and 3h that are in a valid state to the console device 40 as a detection result. In this case, the display control function 443 of the console device 40 displays a notification screen 420 based on the detection result on the display 42.

FIG. 11 is a diagram showing another example of the notification screen 420 according to the present embodiment. In FIG. 11, among the laser sensors 3l, 3a, 3b, 3f, 3g, and 3h that are in a valid state, the laser sensor 3l is detecting an object. In the case of the sitting mode, the movement control function 1523 may display only the laser sensors 3l, 3a, 3b, 3f, 3g, and 3h that are in the valid state, as shown in FIG. Furthermore, the movement control function 1523 displays the laser sensors 3i, 3j, 3k, 3e, 3d, and 3c that are in an invalid state in a different manner from the laser sensors 3l, 3a, 3b, 3f, 3g, and 3h that are in an enabled state. You may do so.

After the process in S16, the process returns to S13, and the processes in S13 to S16 are repeated until no object is detected in the second detection range 302. Note that the process of this flowchart may be stopped after the process of S16, and resumed when a restart operation is received by the operator.

Further, if none of the laser sensors 3l, 3a, 3b, 3f, 3g, and 3h in the valid state detects an object, the movement control function 1523 determines that no object is detected in the second detection range 302. Determination is made (S14 "No"). In this case, the movement control function 1523 permits movement of the gantry 13 (S17).

Then, if the sitting mode is selected, the movement control function 1523 moves the gantry 13 in a half stroke (S18). In this case, the gantry 13 is lowered to approximately the vertical center position of the support column 19, as shown in the center diagram of FIG.

Then, the scan control function 441 of the console device 40 controls the projection data collection process in the gantry device 10, and executes the imaging process to image the subject P in the sitting state (S19). After the imaging process is completed, the movement control function 1523 raises the gantry 13 and returns it to its original position (S20). At this point, the processing of this flowchart ends.

As a comparative example of the standing CT system 1 in this embodiment, a technique is proposed in which a protective member such as an acrylic area cover is installed on the floor where the gantry is installed to reduce contact between the subject and the gantry. be. In such a comparative example, floor moat work is required to install the protective member on the floor, which may result in restrictions on the installation location of the standing CT system.

In addition, in the above comparative example, if there is a gap in the area cover or if the height of the area cover is lower than the height of the subject, the area where the area cover is present and the area where the area cover is not present are There were cases where differences occurred in the line collection results.

Further, in the above-mentioned comparative example, for example, when the subject falls down, there is a possibility that the subject will come into contact with the edge of the area cover, and this will put a load on the subject's body. In addition, since the area cover restricts the flow line of the subject, it may be difficult to move the subject quickly in an emergency such as when the condition of the subject inside the area cover suddenly changes. .

In addition, when imaging in sitting mode, in the comparative example described above, for example, by opening a part of the area cover, the subject's legs or wheelchair may be exposed to the subject with them protruding from the inner diameter of the gantry. The specimen was fixed. However, in such a comparative example, since the flow line of the wheelchair is restricted by the area cover, it may be difficult to image the subject in a sitting state in various orientations.

In another comparative example, there is a technique in which, in an apparatus for imaging a subject in an upright position, a sensor or the like is used to detect that the subject protrudes from the inner diameter of a gantry. However, in such a comparative example, since the detection range is fixed, it may be difficult to respond to various body positions of the subject.

In contrast, the standing CT system 1 of the present embodiment changes the detection range of the laser sensor 3 according to the body position of the subject P, and controls the movement of the gantry 13 according to the detection result by the laser sensor 3. do. Therefore, according to the standing CT system 1 of the present embodiment, when the subject P or another object exists within the movement range of the gantry 13 according to the body position of the subject P during imaging, P or other objects can be detected and movement of the gantry 13 can be controlled according to the detection results. Therefore, according to the standing CT system 1 of the embodiment, the possibility that the gantry 13 will come into contact with the subject P can be reduced even if the protective member is not installed. That is, according to the present embodiment, safety in the standing CT system 1 in which the gantry 13 moves up and down can be improved.

In addition, the standing CT system 1 of this embodiment detects objects located in the first detection range 301, which is a spatial area along the opening of the gantry 13, in the standing mode, and in the sitting mode, In this case, an object located in a second detection range 302 from which a part of the first detection range 301 is excluded is detected. Therefore, by changing the detection range between the standing mode and the sitting mode, the standing CT system 1 of this embodiment can detect when the subject P protrudes from the normal position in each mode. can.

Furthermore, in the standing CT system 1 of this embodiment, the first detection range 301 is a cylindrical spatial region along the opening of the gantry 13 in the space between the gantry 13 and the floor surface 5. Further, the second detection range 302 is an area in which a portion of the first detection range 301 located in the front-rear direction of the subject P is excluded. Therefore, in the standing CT system 1 of this embodiment, in the standing mode, the whole body of the subject P can be monitored so as not to protrude from the imaging possible range 132, and in the sitting mode, the Since the legs of the subject P, the wheelchair, or the like can be allowed to come out of the imaging possible range 132, the subject P sitting in the wheelchair or the like can be imaged.

Further, the standing CT system 1 of this embodiment includes one or more laser sensors 3 installed along the opening of the gantry 13, and in the standing mode, the laser sensor 3 positions the laser sensor 3 in the first detection range 301. If an object is detected, the gantry 13 is not moved. Furthermore, the standing CT system 1 of this embodiment does not move the gantry 13 when an object located in the second detection range 302 is detected by the laser sensor 3 in the sitting mode. Therefore, according to the standing CT system 1 of the embodiment, when the subject P protrudes from the normal position in each mode, or when an object exists within the movement range of the gantry 13 in each mode, the gantry 13 can be prevented from coming into contact with objects such as the subject P.

In the standing CT system 1 of the present embodiment, each of the one or more laser sensors 3a to 3n is connected to one light projecting unit 30 installed along the opening of the gantry 13 and a floor opposite to the gantry 13. One light receiving section 31 installed on the surface 5. Therefore, according to the standing CT system 1 of the present embodiment, it is possible to detect objects such as the subject P that are present at a position between the gantry 13 and the floor surface 5 that may come into contact with the gantry 13. I can do it. Furthermore, in the standing CT system 1 of this embodiment, since the laser beam 32 is projected from above the subject P, the possibility that the subject P looks directly at the laser beam 32 can be reduced.

Note that in this embodiment, a plurality of laser sensors 3a to 3n are provided along the opening of the gantry 13, but the number or position of the laser sensors 3 is not limited to the above example. For example, a configuration may be adopted in which one light projecting section 30 projects the laser beam 32 while rotating along the opening of the gantry 13. When adopting this configuration, a plurality of light receiving units 31 installed on the floor surface 5 along the outer periphery of the imaging possible range 132 receive the laser beam 32, thereby determining the presence or absence of an object located in the first detection range 301. Detect. Furthermore, when adopting this configuration, in the sitting mode, the movement control function 1523 adopts the detection results of objects located within the second detection range 302, but detects objects located outside the second detection range 302. The detection results shall not be adopted.

Further, in the present embodiment, the light projecting section 30 is provided on the inner wall of the gantry 13, but the installation location of the light projecting section 30 is not limited to this. Further, the laser sensor 3 may be included in the gantry device 10 or may be provided outside the gantry device 10. For example, the light projecting section 30 may be provided on the edge of the opening on the lower surface of the gantry 13, the horizontal member 20, the ceiling on which the gantry device 10 is installed, the floor surface 5, or the like. When the light projecting section 30 is provided on the floor surface 5, the light projecting section 30 projects the laser beam 32 upward. In this case, the light receiving section 31 may be provided, for example, on the inner wall of the gantry 13, the edge of the opening on the lower surface of the gantry 13, the horizontal member 20, or the ceiling on which the gantry device 10 is installed. The light projecting unit 30 projects laser light 32 upward. Further, when the laser sensor 3 has a function of detecting reflection of the laser beam 32, the light projecting section 30 and the light receiving section 31 may both be provided in the gantry 13.

In addition, in this embodiment, the valid state and the invalid state of the laser sensor 3 are switched depending on whether or not the laser beam 32 is emitted, but the switching between the valid state and the disabled state of the laser sensor 3 is It is not limited. For example, the laser sensor 3 may continue to emit the laser beam 32 even if it is in the disabled state, and the movement control function 1523 may not use the detection result of the laser sensor 3 in the disabled state. Furthermore, in this embodiment, before the control device 15 receives an instruction to move the gantry 13, that is, in normal times, all the laser sensors 3 are in an invalid state, but while the gantry device 10 is operating, all laser sensors 3 are in an invalid state. The state in which the laser sensor 3 is in the effective state may be set as the normal state.

Furthermore, in this embodiment, the laser sensor 3 detects the presence or absence of an object before the gantry 13 starts moving, but the laser sensor 3 detects the presence or absence of an object even after the gantry 13 starts moving. You may continue. For example, the movement control function 1523 may stop the gantry 13 if an object is detected by the laser sensor 3 after the gantry 13 starts moving.

Further, in this embodiment, the notification function 1524 transmits the position where an object is detected in the first detection range 301 or the second detection range 302 to the console device 40, but the notification function is It is not limited to this. For example, if the gantry device 10 or the console device 40 is equipped with a speaker, the notification function 1524 may notify that an object has been detected by outputting audio such as a message or a warning sound.

In the present embodiment, the standing CT system 1 is capable of imaging the subject P in a standing or sitting position, but may be capable of imaging in other body positions.

In this embodiment, the standing CT system 1 is used as an example of a medical diagnostic system, but the medical diagnostic system is not limited to this. For example, the medical diagnostic system may be a standing MRI (Magnetic Resonance Imaging) device, a standing PET (Positron Emission Tomography) device, a standing SPECT (Single Photon Emission Computed Tomography) device, or the like.

(Second embodiment)
In the first embodiment described above, the laser sensor 3 is used as the detection section, but in this second embodiment, a distance measurement sensor is used as the detection section.

FIG. 12 is a block diagram showing an example of the configuration of the standing CT system 1 according to this embodiment. The standing CT system 1 of this embodiment uses a distance measuring sensor 7a instead of the laser sensor 3 (light projector 30, light receiver 31) in the standing CT system 1 according to the first embodiment described in FIG. 7n (hereinafter simply referred to as distance measuring sensor 7 unless otherwise specified). The distance measurement sensor 7 is an example of a detection unit in this embodiment. Note that the number of distance measuring sensors 7 is not particularly limited. The other configuration of the standing CT system 1 is the same as that of the first embodiment.

The distance sensor 7 is a sensor that can measure the distance to an object. The distance measuring sensor 7 is, for example, a known ultrasonic sensor or an optical sensor.

The distance measurement sensor 7 is installed along the opening of the gantry 13, for example, and measures the distance d between the gantry 13 and an object located in the first detection range 301 or the second detection range 302. For example, as shown in FIG. 12, when a part of the body of the subject P is located within the first detection range 301 of the distance measurement sensor 7, the distance measurement sensor 7 The distance d between the subject P and the body of the subject P who has entered the detection range 301 is measured. Although the distance between the gantry 13 and the subject P is shown in FIG. Measure the distance d.

Furthermore, the definitions of the first detection range 301 in the standing mode and the second detection range 302 in the sitting mode of this embodiment are the same as in the first embodiment. For example, in this embodiment, it is assumed that a plurality of distance measuring sensors 7 are installed in a circle along the opening of the gantry 13.

The distance measurement sensor 7 transmits the measurement result to the control device 15.

FIG. 13 is a block diagram showing an example of the configuration of the control device 15 according to this embodiment. The control device 15 includes a memory 151 and a processing circuit 152 similarly to the first embodiment.

Further, the control device 15 of this embodiment includes an acquisition function 11521, a detection control function 11522, a movement control function 11523, a notification function 11524, and a determination function 1525. The determination function 1525 is an example of a calculation unit.

The detection control function 11522 of this embodiment controls the distance measurement sensor 7 instead of the laser sensor 3. More specifically, similarly to the first embodiment, the detection control function 11522 enables all distance measuring sensors 7 in the standing mode, and activates some of the distance measuring sensors 7 in the sitting mode. Activate the sensor 7.

The acquisition function 11521 of this embodiment acquires measurement results from the distance measurement sensor 7 in addition to the functions of the first embodiment. The acquisition function 11521 sends the acquired measurement results to the determination function 1525.

The determination function 1525 determines whether the distance d between the gantry 13 and the detected object is less than or equal to a threshold value, based on the measurement result of the distance measurement sensor 7 acquired by the acquisition function 11521. When the determination function 1525 determines that the distance d between the gantry 13 and the detected object is less than or equal to the threshold, the movement control function 11525 determines that the distance d between the gantry 13 and the detected object is less than or equal to the threshold. and notification function 11524. The threshold value in this embodiment is not particularly limited.

Note that in FIG. 13, the distance measurement sensor 7 directly measures the distance between the gantry 13 and the detected object, but the measurement result is not limited to this. For example, when the distance measurement sensor 7 is located at the top of the gantry 13, the determination function 1525 subtracts the distance from the distance measurement sensor 7 to the opening of the gantry 13 from the distance between the distance measurement sensor 7 and the object. Accordingly, the distance d between the gantry 13 and the detected object may be determined.

In addition to the functions of the first embodiment, the movement control function 11523 stops the gantry 13 when the distance between the gantry 13 and the object becomes equal to or less than a threshold value.

In addition to the functions of the first embodiment, the notification function 11524 notifies the console device 40 that the gantry 13 and the object are approaching when the distance between the gantry 13 and the object becomes less than or equal to a threshold value. Send. Furthermore, the notification function 11524 may notify that the gantry 13 and the object are approaching by other methods such as voice.

Next, the flow of object detection processing executed in the standing CT system 1 of this embodiment configured as described above will be described.

FIG. 14 is a flowchart showing an example of the flow of object detection processing executed by the standing CT system 1 according to the present embodiment. The process from the process of instructing gantry movement and obtaining the mode selection result in S1 to the process of determining standing mode and sitting mode in S2 is the same as in the first embodiment.

Next, in the case of standing mode (S2 "standing mode"), the detection control function 11522 enables all distance measuring sensors 7 (S101). Then, the acquisition function 11521 acquires the measurement result from the ranging sensor 7 (S102).

The determination function 1525 determines whether the distance d between the gantry 13 and the detected object is equal to or less than a threshold value based on the measurement result of the distance measurement sensor 7 acquired by the acquisition function 11521 (S103 ).

If it is determined that the distance d between the gantry 13 and the detected object is greater than the threshold (S103 "No"), the movement control function 11523 starts moving the gantry 13 (S104). In the case of standing mode, the movement control function 11523 moves the gantry 13 through a full stroke movement range.

While the movement control function 11523 does not determine that the movement of the gantry 13 to the specified position has been completed (S105 "No"), the process returns to S102, and the acquisition function 11521 continuously acquires the measurement results from the distance measurement sensor 7. to get to.

If it is determined that the distance d between the gantry 13 and the detected object is less than or equal to the threshold (S103 "Yes"), the movement control function 11523 stops the movement of the gantry 13 (S106). Further, in this case, the notification function 11524 transmits to the console device 40 that the gantry 13 and the object are approaching S (S107). After the process in S107, the process returns to S102.

If the movement control function 11523 determines that the gantry 13 has been moved to the specified position (S105 "Yes"), the process proceeds to the imaging process of S10. The process of S10 and the process of returning the gantry 13 to its original position in S11 are the same as in the first embodiment.

Next, in the case of the sitting mode (S2 "sitting mode"), the detection control function 11522 enables some distance measuring sensors 7 (S109). The process from the measurement result acquisition process in S110 to the notification process in S114 is the same as the process from S102 to S107 described above. However, in the process of S111, the movement control function 11523 moves the gantry 13 within a half-stroke movement range. Furthermore, the imaging process in S19 and the process of returning the gantry 13 to its original position in S20 are the same as in the first embodiment.

In this way, the standing CT system 1 of the present embodiment includes one or more distance measuring sensors 7 that measure the distance between the gantry 13 and an object located in the first detection range 301 or the second detection range 302. The gantry 13 is stopped when the distance d between the gantry 13 and the object becomes less than or equal to a threshold value. Therefore, according to the standing CT system 1 of this embodiment, in addition to having the effects of the first embodiment, the gantry 13 is moved until the distance d from the object such as the subject P becomes less than or equal to the threshold value. can be continued.

Note that in this embodiment, the detection range is changed between the standing mode and the sitting mode as in the first embodiment, but the first detection range 301 is changed in the sitting mode as well as in the standing mode. It may also be used as the detection range of the distance measuring sensor 7. Further, different threshold values may be used for the standing mode and the sitting mode.

Furthermore, the installation position of the distance measurement sensor 7 is not limited to the example shown in FIG. 12, and may be provided on the floor surface 5, for example.

(Modified example of second embodiment)
In the second embodiment described above, the movement control function 11523 is configured to stop the gantry 13 when the distance between the gantry 13 and the object becomes equal to or less than the threshold value. An interlock may be configured that does not permit movement of the gantry 13 when an object is detected in the second detection range 302.

For example, the movement control function 11523 of this modification does not move the gantry 13 when an object located in the first detection range 301 is detected by the distance measurement sensor 7 in the standing mode. Further, the movement control function 11523 does not move the gantry 13 when an object located in the second detection range 302 is detected by the distance measurement sensor 7 in the sitting mode.

Note that in this modification, the control device 15 does not need to include the determination function 1525. Further, in this modification, the distance measurement sensor 7 may be installed below the subject P. For example, the ranging sensor 7 may be provided on the floor surface 5.

(Third embodiment)
In the third embodiment, the standing CT system 1 has the same configuration as the first embodiment, and further includes a load sensor.

FIG. 15 is a diagram showing an example of installation positions of load sensors 8a to 8k (hereinafter simply referred to as load sensors 8 unless otherwise specified) according to the present embodiment. As shown in FIG. 15, the load sensor 8 is installed on the floor 5 facing the gantry 13. More specifically, the load sensor 8 is installed outside the standing range 133 including the standing positions 1331a and 1331b of the subject P in the standing mode.

The standing positions 1331a and 1331b (hereinafter, when the standing position 1331a and the standing position 1331b are collectively referred to as the standing position 1331) are the positions where the feet of the subject P are placed in the standing mode. In FIG. 15, as an example, a state in which one of the left and right feet of the subject P is placed in a standing position 1331a and the other foot is placed in a standing position 1331b is a normal standing posture. shall be. Further, the standing range 133 shown in FIG. 15 is smaller than the imaging possible range 132, and is a circular area including the standing position 1331 in the standing mode. In other words, the standing position 1331 is included in the standing position range 133. Even if the left and right feet of the subject P deviate from the standing position 1331, if the left and right feet of the subject P are located within the standing position range 133, there is a low possibility that the subject P will come into contact with the gantry 13. shall be. The shape of the standing range 133 is, for example, a reduced shape of the imaging possible range 132, but is not limited to this. Note that the standing range 133 may also be referred to as the standing position of the subject P.

In this embodiment, as shown in FIG. 15, the load sensor 8 is installed between the outer edge of the standing range 133 and the outer edge of the imaging possible range 132. Further, the load sensor 8 may be installed outside the imaging possible range 132.

The load sensor 8 shown in FIG. 15 is an example of a first load sensor. Note that the number of load sensors 8 is not particularly limited, and although a plurality of load sensors 8 are shown in FIG. 15, a single load sensor may be installed.

The load sensor 8 transmits the load detection result to the control device 15.

Further, the standing CT system 1 of this embodiment has the same configuration as the first embodiment.

Further, the control device 15 of this embodiment includes a memory 151 and a processing circuit 152 similarly to the first embodiment. Further, the processing circuit 152 includes an acquisition function 1521, a detection control function 1522, a movement control function 1523, and a notification function 1524, as in the first embodiment.

The acquisition function 1521 of this embodiment acquires the load detection result from the load sensor 8, in addition to having the functions of the first embodiment.

Further, in addition to the function of the first embodiment, the movement control function 1523 of this embodiment does not move the gantry 13 when a load is detected by the load sensor 8. For example, when the movement control function 1523 of this embodiment receives an instruction to move the gantry 13 in the standing mode, even if an object located in the first detection range 301 is not detected by the laser sensor 3, When a load is detected by the load sensor 8, the gantry 13 is not moved.

Further, the movement control function 1523 may stop the gantry 13 when a load is detected by the load sensor 8 while the gantry 13 is moving. Note that the movement control function 1523 may employ the measurement result of the load sensor 8 only in the standing mode, and may not employ it in the sitting mode.

As described above, according to the standing CT system 1 of the present embodiment, in addition to the effects of the first embodiment, the subject P is prevented from coming out of the standing range 133 due to staggering or the like and coming into contact with the gantry 13. can be reduced.

Note that the configuration of this embodiment may be combined with the second embodiment or a modification of the second embodiment. Further, the notification function 1524 may be configured to notify when a load is detected by the load sensor 8. For example, the notification function 1524 may transmit to the console device 40 that a movement of the subject P or a change in load has been detected, or may notify the console device 40 by voice or the like.

(Modified example of third embodiment)
In the third embodiment described above, the load sensor 8 is installed outside the standing positions 1331a, 1331b of the subject P in the standing mode, but in this modification, the load sensor 8 is installed outside the standing position 1331a, 1331b of the subject P in the standing mode. , and further load sensors are installed. The other load sensor is an example of a second load sensor.

For example, the second load sensor detects an area on the floor surface 5 facing the gantry 13 that is smaller than a range projected onto the floor surface 5 by the opening of the gantry 13, and when the subject P is standing in the standing mode. It is installed in a range including position 1331. As an example, the second load sensor is installed within the standing range 133 shown in FIG.

The second load sensor detects a change in load due to movement of the subject P, wobbling of the subject P, etc. even when the subject P has not left the standing range 133.

The notification function 1524 of this modification provides notification when movement of the subject P or a change in the load is detected by the second load sensor. The notification function 1524 may transmit to the console device 40 that a movement of the subject P or a change in load has been detected, or may notify the console device 40 by voice or the like.

As described above, according to the standing CT system 1 of this modification, even if the subject P is not located in the first detection range 301 of the gantry 13, the shaking of the subject P is detected. P can be prevented from coming close to the gantry 13.

(Other variations)
In each of the embodiments described above, the object detection process is executed after the standing mode or the sitting mode is selected in advance, but the flow of the process is not limited to this. For example, a configuration may be adopted in which the standing mode and the sitting mode are switched according to the detection result by the laser sensor 3 or the distance measuring sensor 7. For example, if an object is not detected in the first detection range 301, the scan control function 441 of the console device 40 executes imaging in the standing mode, and although the object is detected in the first detection range 301, , if no object is detected in the second detection range 302, imaging may be performed in sitting mode.

Further, the scan control function 441 of the console device 40 may switch between the standing mode and the sitting mode depending on the length of the distance d between the gantry 13 and the object measured by the distance measurement sensor 7.

According to at least one embodiment described above, safety in a medical diagnostic system in which a gantry moves up and down can be improved.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

1 System 3, 3a to 3n Laser sensor 5 Floor surface 6 Wheelchair 7, 7a to 7n Distance sensor 8, 8a to 8k Load sensor 10 Frame device 11 X-ray tube device 12 X-ray detector 13 Gantry 14 X-ray high voltage device 15 Control device 16 Wedge 17 Collimator 18 DAS
19, 19a, 19b Post 20 Horizontal member 30, 30a to 30n Light emitter 31, 31a to 31n Light receiver 32, 32a to 32n Laser light 40 Console device 41 Memory 42 Display 43 Input interface 44 Processing circuit 131 Cavity 132 Imaging range 133 Standing range 151 Memory 152 Processing circuit 301 First detection range 302 Second detection range 420 Notification screen 441 Scan control function 442 Image generation function 443 Display control function 1331, 1331a, 1331b Standing position 1521, 11521 Acquisition function 1522, 11522 Detection control function 1523, 11523 Movement control function 1524, 11524 Notification function 1525, Judgment function

Claims (9)

A gantry that can be moved vertically,
an imaging unit provided in the gantry and capable of imaging the subject;
a detection unit capable of detecting an object located within a movement range of the gantry;
a scan control unit that selects one of a standing mode for imaging the subject in a standing position and a sitting mode for imaging the subject in a sitting position, according to a detection result by the detection unit; ,
A medical diagnostic system equipped with The detection unit is provided in the gantry and has a first detection range that is a spatial region along an opening that accommodates the subject, and a second detection range in which a part of the first detection range is excluded. detecting the object located within a range;
The scan control unit selects one of the standing mode and the sitting mode based on the detection result of the first detection range and the detection result of the second detection range.
The medical diagnostic system according to claim 1. The detection unit is one or more laser sensors installed along the opening of the gantry,
When the object located in the first detection range is detected by the one or more laser sensors in the standing mode, the scan control unit does not move the gantry and detects the object in the sitting mode. If the object located in the second detection range is detected by the laser sensor, the gantry is not moved;
The medical diagnostic system according to claim 2. Each of the one or more laser sensors includes one light projector installed along the opening of the gantry, and one light receiver installed on the floor facing the gantry.
The medical diagnostic system according to claim 3. The detection unit is one or more distance measuring sensors that measure the distance between the object located in the first detection range or the second detection range and the gantry,
The scan control unit stops the gantry when the distance between the gantry and the object becomes less than or equal to a threshold.
The medical diagnostic system according to claim 2. The detection unit is one or more distance measuring sensors that measure the distance between the object located in the first detection range or the second detection range and the gantry,
When the object located in the first detection range is detected by the one or more distance measuring sensors in the standing mode, the scan control unit does not move the gantry and moves the object in the sitting mode. not moving the gantry when the object located in the second detection range is detected by one or more distance measuring sensors;
The medical diagnostic system according to claim 2. further comprising a first load sensor installed on a floor surface facing the gantry outside a range including a standing position of the subject in the standing mode;
The scan control unit does not move the gantry when a load is detected by the first load sensor.
The medical diagnostic system according to any one of claims 2 to 6. A second sensor installed on the floor surface facing the gantry in a range smaller than the range projected onto the floor surface and including the standing position of the subject in the standing mode. load sensor,
further comprising a notification unit that notifies when movement of the subject or variation in load is detected by the second load sensor;
The medical diagnostic system according to claim 7. a detection step of detecting an object located within a movement range of a vertically movable gantry having an imaging unit capable of capturing an image of the subject;
a selection step of selecting one of a standing mode for imaging the subject in a standing position and a sitting mode for imaging the subject in a sitting position, according to the detection result of the detection step;
method including.

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