JP6687394B2 - X-ray diagnostic device and X-ray detector - Google Patents

Description

  Embodiments of the present invention relate to an X-ray diagnostic apparatus and an X-ray detector.

  The X-ray diagnostic apparatus irradiates the subject with X-rays from an X-ray tube and detects the X-rays transmitted through the subject with an X-ray detector to generate an X-ray image. Here, in the generation of an X-ray image by the X-ray diagnostic apparatus, a portable X-ray detector (for example, a portable FPD (Flat Panel Detector)) is provided separately from the X-ray detector provided in the main body of the X-ray diagnostic apparatus. Etc.) may be used. For example, in a diagnosis using an X-ray diagnostic apparatus, a portable X-ray detector is used when the X-ray detector is brought into close contact with a target site of a subject and an image is taken.

  When such a portable X-ray detector is used, the operator usually sets the portable X-ray detector on the target site of the subject and within the detection range of the set X-ray detector. The position of the X-ray tube, the position of the top plate, etc. are adjusted so that the X-rays are irradiated onto.

JP, 2011-15868, A JP, 2010-119485, A Japanese Utility Model Publication No. 3-62340

  The problem to be solved by the present invention is to provide an X-ray diagnostic apparatus and an X-ray detector that can improve the efficiency of inspection using a portable X-ray detector.

  The X-ray diagnostic apparatus according to the embodiment includes an X-ray detector, a top plate, a calculator, and a controller. The X-ray detector detects X-rays emitted from the X-ray tube. The X-ray detector and the subject are placed on the top plate. The calculator calculates position information of the X-ray detector with respect to the top plate. The control unit sets an irradiation condition related to an X-ray irradiation range based on the position information calculated by the calculation unit and the position information of the X-ray tube with respect to the top plate, and the X-ray is set under the set irradiation condition. Irradiate a line.

FIG. 1 is a diagram showing an example of an X-ray diagnostic apparatus according to the first embodiment. FIG. 2 is a block diagram showing an example of the configuration of the X-ray diagnostic apparatus according to the first embodiment. FIG. 3 is a diagram showing an example of the configuration of the portable FPD according to the first embodiment. FIG. 4 is a diagram illustrating an example of the portable FPD according to the first embodiment. FIG. 5 is a diagram for explaining the reference position according to the first embodiment. FIG. 6 is a diagram for explaining calculation of rotation information according to the first embodiment. FIG. 7 is a flow chart for explaining a series of processing flow of the X-ray diagnostic apparatus according to the first embodiment. FIG. 8 is a diagram showing an example of a portable FPD according to the second embodiment.

  Hereinafter, an X-ray diagnostic apparatus according to an embodiment will be described with reference to the drawings. An X-ray diagnostic apparatus including a portable X-ray detector in addition to the X-ray detector configured integrally with the X-ray diagnostic apparatus body will be described below. Further, a case will be described below in which an FPD having X-ray detection elements arranged two-dimensionally on a plane and a portable FPD that can be carried by an operator is used as a portable X-ray detector.

(First embodiment)
First, an example of the X-ray diagnostic apparatus according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an example of an X-ray diagnostic apparatus according to the first embodiment. As shown in FIG. 1, the X-ray diagnostic apparatus according to the first embodiment includes an X-ray tube, a top plate, a portable FPD, an X-ray detector, and the like. The X-ray diagnostic apparatus shown in FIG. 1 can select and use either a portable FPD or an X-ray detector for detecting X-rays emitted from an X-ray tube.

  The portable FPD shown in FIG. 1 is placed on the top plate, and an operator or the like can manually move the position where the portable FPD is placed. Then, the X-ray diagnostic apparatus according to the first embodiment can capture an X-ray image by using the portable FPD placed at an arbitrary position on the top plate. For example, in a case where an image of an affected arm is taken for a subject with a broken arm, the X-ray diagnostic apparatus irradiates the affected part of the subject with X-rays from an X-ray tube to An X-ray image is taken by detecting the X-ray with a portable FPD arranged below.

  Further, the X-ray diagnostic apparatus according to the first embodiment can take down the portable FPD shown in FIG. 1 from the top plate and execute X-ray image capturing using the X-ray detector. For example, when the whole body of the subject is imaged, the X-ray diagnostic apparatus does not place the portable FPD on the top plate, and the X-ray tube and the X-ray detector face each other with respect to the subject. X-rays are emitted while moving by moving, and X-rays are detected by an X-ray detector.

  Next, an example of the configuration of the X-ray diagnostic apparatus 1 according to the first embodiment will be described with reference to FIG. FIG. 2 is a block diagram showing an example of the configuration of the X-ray diagnostic apparatus 1 according to the first embodiment. As shown in FIG. 2, the X-ray diagnostic apparatus 1 according to the first embodiment includes an X-ray source 101, a portable FPD 104, a bed device 105, a display 109, an input circuit 110, a storage circuit 111, and And a processing circuit 112.

  The X-ray source 101 includes an X-ray tube 102 and an X-ray diaphragm device 103. The X-ray tube 102 generates X-rays using a high voltage supplied from a high voltage generator (not shown). The X-ray diaphragm device 103 controls the X-ray irradiation field for the purpose of reducing the exposure dose to the subject P1 and improving the image quality of image data. Further, the X-ray source 101 is supported by a supporting portion such as an arm and is driven by a driving device (not shown). Under the control of the control function 112b, the drive device moves the position of the X-ray source 101, for example, by driving an arm that supports the X-ray source 101. Further, the driving device can rotate the X-ray source 101 around a support portion that supports the X-ray source 101 as an axis, for example. Further, the drive device moves the position of the diaphragm blade of the X-ray diaphragm device 103 under the control of the control function 112b. That is, the control function 112b controls the irradiation range of the X-rays irradiated to the subject P1 by adjusting the opening of the diaphragm blade of the X-ray diaphragm device 103.

  The portable FPD 104 has a plurality of X-ray detection elements, and detects the data of the two-dimensional intensity distribution of the X-rays emitted from the X-ray source 101 and transmitted through the subject P1 (two-dimensional intensity distribution data). Here, the portable FPD 104 is placed on the top plate 106 and moved by the operator. Then, the portable FPD 104 according to the first embodiment collects information regarding movement on the top plate 106 and transmits the information to the processing circuit 112. Information regarding movement will be described later.

  The bed device 105 includes a top plate 106, an X-ray detector 107, and a bed driving device 108. The portable FPD 104 and the subject P1 are placed on the top plate 106. In addition, when imaging is performed using the X-ray detector 107, the X-rays emitted from the X-ray tube 102 are detected by the X-ray detector 107 after passing through the top plate 106. Therefore, the top plate 106 is configured so as not to affect the transmitted X-rays. A reference position is set on the surface of the top plate 106. The reference position will be described later.

  The X-ray detector 107 has a plurality of X-ray detection elements, and detects the two-dimensional intensity distribution data of the X-rays emitted from the X-ray source 101 and transmitted through the subject P1. The bed driving device 108 moves the top 106 and the X-ray detector 107 in the vertical direction and the horizontal direction under the control of the control function 112b.

  The display 109 is a monitor referred to by the operator, and displays the X-ray irradiation conditions, the X-ray image generated by imaging, and the like under the control of the control function 112b. The input circuit 110 has a mouse, a keyboard, a trackball, a switch, a button, a joystick, etc. used for inputting various instructions and various settings, and receives instructions and settings from an operator. For example, the input circuit 110 can include an offset switch and a positioning switch.

  The storage circuit 111 stores data used when the processing circuit 112 controls the entire processing by the X-ray diagnostic apparatus 1, X-ray image data, and the like. The storage circuit 111 also stores the coordinates of the reference position on the top plate 106, the coordinates of the optical sensor on the portable FPD 104, and the like. Further, the storage circuit 111 stores each program executed by the processing circuit 112.

  The processing circuit 112 executes a calculation function 112a, a control function 112b, and an image generation function 112c. In the embodiment in FIG. 2, each processing function performed by the component calculation function 112a, the control function 112b, and the image generation function 112c is recorded in the storage circuit 111 in the form of a program executable by a computer. The processing circuit 112 is a processor that realizes a function corresponding to each program by reading the program from the storage circuit 111 and executing the program. In other words, the processing circuit 112 in the state where each program is read out has the functions shown in the processing circuit 112 of FIG. Note that, in FIG. 2, it is described that the processing function performed by the calculation function 112a, the control function 112b, and the image generation function 112c is realized by a single processing circuit, but the processing is performed by combining a plurality of independent processors. A circuit may be configured so that each processor implements a function by executing a program.

  The word "processor" used in the above description is, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or an application-specific integrated circuit (ASIC), a programmable logic device (for example, A circuit such as a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA). The processor realizes the function by reading and executing the program stored in the storage circuit 111. Instead of storing the program in the memory circuit 111, the program may be directly incorporated in the circuit of the processor. In this case, the processor realizes the function by reading and executing the program incorporated in the circuit. It should be noted that each processor of the present embodiment is not limited to the case where each processor is configured as a single circuit, and a plurality of independent circuits may be combined and configured as one processor to realize its function. Good. Further, the plurality of constituent elements in FIG. 2 may be integrated into one processor to realize its function.

  The calculation function 112a in the first embodiment is an example of the calculation unit in the claims. Further, the control function 112b in the first embodiment is an example of the control unit in the claims.

  The processing circuit 112 controls the entire processing by the X-ray diagnostic apparatus 1. The processing performed by the X-ray diagnostic apparatus 1 is specifically for imaging such as setting imaging conditions, X-ray exposure, X-ray detection, output signal generation, X-ray image data generation, and image display. This is a series of such processes. Here, the processing circuit 112 according to the first embodiment calculates the position information of the portable FPD 104 with respect to the top plate 106 based on the movement amount on the top plate 106 received from the portable FPD 104, and The irradiation conditions related to the irradiation range are set, and imaging under the set irradiation conditions is controlled. The details of the control will be described later.

  The overall configuration of the X-ray diagnostic apparatus 1 according to the first embodiment has been described above. With such a configuration, the X-ray diagnostic apparatus 1 according to the first embodiment calculates the position information of the portable FPD 104 with respect to the top plate 106, and sets the irradiation condition related to the X-ray irradiation range, thereby improving the inspection efficiency. Improve.

  Here, first, a conventional X-ray diagnostic apparatus will be described. Conventionally, an X-ray diagnostic apparatus detects an X-ray irradiation range based on a positional relationship between an X-ray source and an X-ray detector when capturing an X-ray image using the X-ray detector. The X-ray irradiation conditions can be automatically set so as to be included in the range. On the other hand, when an X-ray image is captured using the portable FPD, the conventional X-ray diagnostic apparatus does not grasp the position information of the portable FPD that can be manually moved by the operator. The shooting conditions cannot be set. Therefore, in the conventional X-ray diagnostic apparatus, when using the portable FPD, the operator adjusts the position of the portable FPD, the X-ray irradiation range, etc. so that the X-ray irradiation range is included in the X-ray detection range. However, in particular, when the portable FPD is arranged on the back surface of the subject, it is difficult to perform the alignment, the time required for the inspection becomes long, and the inspection efficiency may decrease.

  Therefore, the X-ray diagnostic apparatus 1 according to the first embodiment improves the inspection efficiency by calculating the position information of the portable FPD 104 and automatically setting the irradiation condition related to the X-ray irradiation range. Specifically, the X-ray diagnostic apparatus 1 according to the first embodiment calculates the position information of the portable FPD 104 with respect to the top 106 using the movement amount of the portable FPD 104 on the top 106. Then, the X-ray diagnostic apparatus 1 sets the irradiation condition related to the irradiation range of the X-ray based on the calculated position information and the position information of the X-ray tube 102 with respect to the top plate 106, and the X-ray is set under the set irradiation condition. Irradiate a line.

  First, the configuration of the portable FPD 104 according to the first embodiment will be described. FIG. 3 is a diagram showing an example of the configuration of the portable FPD 104 according to the first embodiment. As shown in FIG. 3, the portable FPD 104 according to the first embodiment has an X-ray detection circuit 104a, a displacement detection circuit 104b, and a transmission circuit 104c.

  The X-ray detection circuit 104a according to the first embodiment has an X-ray detection element and detects the two-dimensional intensity distribution data of the irradiated X-ray. Here, a plurality of X-ray detection elements are arranged in a two-dimensional (matrix) form on the upper surface of the portable FPD 104. The displacement detection circuit 104b according to the first embodiment detects the amount of movement of the portable FPD 104 on the top plate 106. For example, the displacement detection circuit 104b has a sensor that detects the movement of the portable FPD 104, and detects the movement amount based on the information detected by the sensor.

  Here, the sensor that detects the movement is, for example, an optical sensor that detects the movement by identifying the pattern on the surface of the opposing flat surface, a ball sensor that detects the movement based on the rotation of the ball, or the like. As an example, the optical sensor included in the displacement detection circuit 104b detects the amount of movement by irradiating the facing plane with laser light and detecting the reflection of the radiated laser light. Here, in the optical sensor, by using the laser light in the invisible light region, for example, it is assumed that the portable FPD 104 is lifted in a state where the laser light is emitted and the operator or the subject P1 is irradiated with the laser light. Also, it is possible to avoid making the operator, the subject P1 and the like uncomfortable. Therefore, by using the laser light in the invisible light region for the optical sensor, it is possible to avoid annoyance to the operator, the subject P1, and the like that may occur when the portable FPD 104 includes the optical sensor. In addition, as an example, in the ball sensor included in the displacement detection circuit 104b, the encoder rotates due to the rotation of the ball that is in contact with the flat surface, and the optical sensor detects the rotation number of the encoder to detect the movement amount.

  The transmission circuit 104c according to the first embodiment performs wireless communication with the processing circuit 112 and transmits various kinds of information. For example, the transmission circuit 104c transmits the two-dimensional intensity distribution data of the X-ray detected by the X-ray detection circuit 104a and the movement amount detected by the displacement detection circuit 104b to the processing circuit 112.

  Hereinafter, an example of the portable FPD 104 according to the first embodiment will be described with reference to FIG. FIG. 4 is a diagram showing an example of the portable FPD 104 according to the first embodiment. In FIG. 4, the case where the displacement detection circuit 104b includes an optical sensor will be described as an example. For example, the portable FPD 104 has an X-ray detection element on the upper surface and an optical sensor on the lower surface, as shown in FIG. Here, the portable FPD 104 according to the first embodiment has two optical sensors in order to acquire rotation information. That is, the portable FPD 104 calculates the rotation information of the portable FPD 104 using the two movement amounts detected by the two optical sensors. The rotation information will be described later.

  When the portable FPD 104 is placed on the top plate 106, the optical sensor shown in FIG. 4 faces the top plate 106, irradiates the top plate 106 with laser light, and reflects the reflected laser light. To detect. For example, the optical sensor identifies the pattern on the surface of the top plate 106 from the information of the reflected laser light. Then, the displacement detection circuit 104b detects the amount of movement of the portable FPD 104 with respect to the top plate 106 from the change in the pattern on the surface of the top plate 106 identified by the optical sensor.

  Although the portable FPD 104 shown in FIG. 4 includes two optical sensors, the portable FPD 104 according to the first embodiment may include any number of optical sensors. Further, as shown in FIG. 4, when there are a plurality of optical sensors, the displacement detection circuit 104b detects the amount of movement corresponding to each optical sensor. Note that each optical sensor may be provided with the displacement detection circuit 104b, or may be processed by one displacement detection circuit 104b.

  Here, as shown in FIG. 4, the portable FPD 104 has an offset switch. The offset switch is a switch for designating an initial position when the displacement detection circuit 104b detects the movement amount of the portable FPD 104. That is, the displacement detection circuit 104b uses the position at the time when the offset switch is pressed as the initial position, and detects the movement detected after the offset switch is pressed as the movement amount. For example, the offset switch is pressed after the portable FPD 104 is placed at the reference position on the top plate 106.

  The reference position is a position set as an initial position of the portable FPD 104 on the top plate 106, and, for example, as shown in FIG. 5, reference positions A to C are set. Here, the reference position on the top plate 106 can be set arbitrarily, and for example, different reference positions can be set for each hospital. The reference position is shown on the top plate 106 so that it can be identified by the operator. For example, as shown in FIG. 5, the reference positions A to C are displayed on the top plate 106 by paint or light rays. The operator selects an optimum reference position from the reference positions A to C displayed on the top plate 106 and sets it as the initial position of the portable FPD 104. To give an example, the operator selects a reference position according to the affected part of the subject and places the portable FPD 104 at the selected reference position. For example, when the affected part is on the abdomen of the subject, it can be expected that the affected part of the subject when placed on the top plate 106 is relatively close to the reference position B, so the operator selects the reference position B. Then, the portable FPD 104 is placed at the reference position B. Then, the operator presses the offset switch corresponding to the selected reference position. For example, when the operator places the portable FPD 104 at the reference position B in FIG. 5, the operator presses the offset switch B in FIG. Note that FIG. 5 is a diagram for explaining the reference position according to the first embodiment.

  For example, the portable FPD 104 is placed at the reference position B on the top plate 106, and the offset switch is pressed. As a result, the portable FPD 104 detects the movement amount with the reference position B as the initial position. After pressing the offset switch, the operator places the subject on the top plate 106 and the portable FPD 104, and adjusts the position of the portable FPD 104 so that the affected part of the subject sits on the portable FPD 104. Then, the positioning switch provided in the input circuit 110 is pressed. The positioning switch is a switch for notifying the processing circuit 112 that the adjustment for placing the affected part of the subject on the portable FPD 104 is completed, and the processing circuit 112 is triggered by the pressing of the positioning switch to be portable. The calculation process of the position information of the FPD 104 is started.

  The displacement detection circuit 104b detects the moving amount of the portable FPD 104 from the pressing of the offset switch to the pressing of the positioning switch, and the transmitting circuit 104c transmits the moving amount to the processing circuit 112. Then, the calculation function 112a according to the first embodiment calculates the position information of the portable FPD 104 with respect to the tabletop 106 based on the position information of the reference position and the movement amount of the portable FPD 104 from the reference position.

  Although the offset switch is arranged on the upper surface of the portable FPD 104 in FIG. 4, the position of the offset switch is arbitrary. For example, the function of the offset switch may be realized by operating a mouse, a keyboard, or the like through the GUI displayed on the display 109. Further, the position of the positioning switch is also arbitrary, and for example, it may be arranged on the upper surface of the portable FPD 104 shown in FIG.

  Next, calculation of position information of the portable FPD 104 with respect to the top plate 106 will be described. The calculation function 112a according to the first embodiment calculates the position information of the portable FPD 104 with respect to the top plate 106 based on the position information of the reference position and the movement amount of the portable FPD 104 from the reference position.

  First, the calculation function 112a acquires the position information of the reference position from the storage circuit 111 according to the pressed offset switch. For example, when the offset switch B of FIG. 4 is pressed, the calculation function 112a acquires the position information of the reference position B shown in FIG. 5 from the storage circuit 111 as the position information of the reference position. Here, the position information of the reference position is coordinates and the like of the reference position with respect to the top plate 106. Then, the calculation function 112a, based on the position information of the reference position on the top plate 106 and the movement amount of the portable FPD 104 from the reference position, the position information of the portable FPD 104 with respect to the top plate 106 at the time when the positioning switch is pressed. To calculate.

  For example, the calculation function 112a calculates the coordinates of the position moved by the amount of movement from the coordinates of the reference position as the position information of the portable FPD 104. The coordinates calculated here may be coordinates corresponding to the entire range of the portable FPD 104 or may be coordinates corresponding to the X-ray detection range (range of the X-ray detection element). For example, when the range of the reference position is set to the same size as the portable FPD 104 and the coordinates corresponding to the X-ray detection range are calculated, the calculation function 112a first moves from the coordinates of the range of the reference position by the movement amount. By calculating the coordinates thus calculated, the coordinates corresponding to the entire range of the portable FPD 104 are calculated. Then, the calculation function 112a calculates the coordinates corresponding to the X-ray detection range from the coordinates corresponding to the entire range of the portable FPD 104, based on the position (coordinates) of the X-ray detection range in the portable FPD 104. The position of the X-ray detection range in the portable FPD 104 is acquired from the specifications of the portable FPD 104 and stored in the storage circuit 111 in advance. That is, the calculation function 112a acquires the information of the position of the X-ray detection range in the portable FPD 104 from the storage circuit 111, and further calculates the coordinates corresponding to the X-ray detection range among the calculated coordinates corresponding to the entire portable FPD 104. To do.

  Further, for example, when the reference position is set to a size different from that of the portable FPD 104, the mounting method of the portable FPD 104 with respect to the reference position is set in advance, and the position information (coordinates) of the reference position and the size information of the portable FPD 104 are set. From this, the position information of the portable FPD 104 with respect to the top plate 106 is calculated. For example, when the four corners of the top plate 106 are set as the reference position, the operator selects any one of the four corners, and the portable FPD 104 is placed on the top so that the corner of the portable FPD 104 matches the selected corner. It is placed on the plate 106. The calculation function 112a calculates the coordinate after the movement of the corner of the portable FPD 104 aligned with the reference position from the coordinate of the selected reference position (corner) and the calculated movement amount. Then, the calculation function 112a calculates the coordinates corresponding to the entire range of the portable FPD 104 after the movement from the coordinates of the corner after the movement and the size of the portable FPD 104. The size of the portable FPD 104 is acquired from the specifications of the portable FPD 104 and stored in the storage circuit 111 in advance. Further, the calculation function 112a can further calculate the coordinates corresponding to the X-ray detection range by the method described above.

  Here, the X-ray diagnostic apparatus 1 according to the first embodiment can also calculate rotation information of the portable FPD 104 with respect to the top 106 in addition to position information of the portable FPD 104 with respect to the top 106. Hereinafter, calculation of the rotation information by the calculation function 112a according to the first embodiment will be described with reference to FIG. FIG. 6 is a diagram for explaining calculation of rotation information according to the first embodiment.

  For example, as shown in the upper diagram of FIG. 6, the portable FPD 104 having two optical sensors is placed at the reference position, and the rotation angle of the portable FPD 104 with respect to the top plate 106 at this time is set to “0”. Here, the calculation function 112a uses the coordinates of the portable FPD 104 placed at the reference position on the top plate 106 and the information of the position of each optical sensor with respect to the portable FPD 104 to determine each optical position on the top plate 106. The coordinates of the expression sensor can be calculated. The information on the position of each optical sensor with respect to the portable FPD 104 is acquired from the specifications of the portable FPD 104 and stored in the storage circuit 111 in advance. That is, the calculation function 112a determines the coordinates on the top plate 106 corresponding to the positions of the optical sensors at the time when the portable FPD 104 is placed at the reference position on the top plate 106 for each optical type on the top plate 106. Calculate as the coordinates of the sensor.

  Then, as shown in the lower diagram of FIG. 6, when the portable FPD 104 moves on the top plate 106, each of the two optical sensors included in the portable FPD 104 detects the amount of movement with respect to the top plate 106. Here, the calculation function 112a uses the coordinates of each optical sensor at the time when the portable FPD 104 is placed at the reference position and the movement amount detected by each optical sensor, with the top plate 106 as a reference. The coordinates after the movement of the optical sensor are calculated. Further, the calculation function 112a calculates the positional relationship between the two optical sensors from the coordinates of each optical sensor after the movement, and calculates the rotation information of the portable FPD 104. For example, when the portable FPD 104 is moved as shown in the lower diagram of FIG. 6, the calculation function 112a calculates the positional relationship between the optical sensors based on the coordinates of each optical sensor, and thus the portable FPD 104 after the movement is calculated. The rotation angle “θ1” is calculated as the rotation information.

  As described above, the calculation function 112a calculates the positional relationship between the two optical sensors and the rotation information of the portable FPD 104. As an example, the calculation function 112a uses the coordinates of each optical sensor to calculate the inclination of a straight line connecting two optical sensors at the reference position and the inclination of a straight line connecting two optical sensors after movement. The rotation angle “θ1” is calculated by comparison.

  Next, the setting of irradiation conditions related to the X-ray irradiation range will be described. First, the control function 112b according to the first embodiment determines the X-ray tube 102 based on the position information of the portable FPD 104 with respect to the table 106 calculated by the calculation function 112a and the position information of the X-ray tube 102 with respect to the table 106. Position information of the portable FPD 104 (positional relationship between the X-ray tube 102 and the portable FPD 104) is calculated. Since the control function 112b controls the position of the top plate 106 and the position of the X-ray tube 102, the position information of the X-ray tube 102 with respect to the top plate 106 can be acquired.

  Then, the control function 112b sets an irradiation condition for matching the X-ray irradiation range with the X-ray detection range in the portable FPD 104 based on the calculated positional relationship information between the X-ray tube 102 and the portable FPD 104. That is, the control function 112b sets the position and rotation amount of the X-ray source 101 so that the X-ray detection range of the portable FPD 104 after movement is irradiated with X-rays.

  As an example, the control function 112b calculates a shift amount between the X-ray irradiation range and the X-ray detection range using the position information and the rotation information of the portable FPD 104, and corrects the shift amount by using the X-ray. The irradiation conditions relating to the irradiation range of are set. Here, the irradiation conditions related to the X-ray irradiation range include the position of the top plate 106, the position of the X-ray tube 102, the rotation amount of the X-ray tube 102, the aperture opening of the X-ray aperture device 103, and the X-ray aperture device. It is a condition that affects the X-ray irradiation range, such as the rotation amount of 103. For example, the control function 112b calculates the shift amount of the center coordinates of the X-ray irradiation range and the X-ray detection range, and sets the horizontal position of the top plate 106 or the X-ray tube 102 so as to correct the shift amount. To do. The control function 112b can calculate the position of the X-ray detection range in the portable FPD 104 from the specifications of the portable FPD 104. For example, when the coordinates corresponding to the entire range of the portable FPD 104 are calculated, the control function 112b calculates the coordinates corresponding to the X-ray detection range from the calculated coordinates.

  Further, the control function 112b can acquire SID (Source-Isocenter Distance) information, which is information on the distance between the X-ray focal point and the X-ray detection surface, from the position information of the portable FPD 104 with respect to the X-ray tube 102. The control function 112b calculates the area of the irradiation field from the SID information and the aperture opening of the X-ray diaphragm device 103, thereby calculating the amount of deviation related to the area between the X-ray irradiation range and the X-ray detection range, and calculating the deviation amount. The position in the vertical direction of the top plate 106, the aperture opening of the X-ray aperture apparatus 103, and the like are set so that the correction is performed.

  Further, the control function 112b uses the rotation information of the portable FPD 104 with respect to the tabletop 106 to calculate a shift amount regarding the rotation angle between the X-ray irradiation range and the X-ray detection range, and corrects the shift amount by using the X-ray. The amount of rotation of the tube 102 and the X-ray diaphragm device 103 is set. The X-ray diaphragm device 103 may have a shape of the irradiation field that matches the X-ray detection range of the portable FPD 104. For example, the X-ray diaphragm device 103 has a square X-ray detection range of the portable FPD 104. In some cases, the diaphragm is controlled so that the irradiation field becomes square.

  As described above, the control function 112b according to the first embodiment calculates the deviation amount between the X-ray irradiation range and the X-ray detection range, and irradiates the X-ray irradiation range so as to correct the deviation amount. Set the conditions. For example, the control function 112b sets the irradiation condition related to the X-ray irradiation range so that the X-ray irradiation range is included in the X-ray detection range. Further, for example, the control function 112b can also set an irradiation condition in which the shapes, positions, areas, and rotation angles of the X-ray irradiation range and the X-ray detection range all match.

  Then, the control function 112b according to the first embodiment causes the X-ray tube 102 to irradiate the X-ray under the set irradiation condition, and the X-ray detection circuit 104a detects the X-ray transmitted through the subject P1. The transmission circuit 104c transmits the X-ray two-dimensional intensity distribution data detected by the X-ray detection circuit 104a to the processing circuit 112, and the image generation function 112c generates X-ray image data from the X-ray two-dimensional intensity distribution data. .

  Next, an example of a procedure of processing by the X-ray diagnostic apparatus 1 will be described with reference to FIG. FIG. 7 is a flowchart for explaining a series of processing flow of the X-ray diagnostic apparatus 1 according to the first embodiment. Step 105 is a step corresponding to the calculation function 112a. Step 106, step 107, step 108, step 109, step 110, step 111 and step 112 are steps corresponding to the control function 112b.

  First, the operator places the portable FPD 104 at the reference position (step 101) and presses the offset switch (step 102). Then, the operator adjusts the position of the portable FPD 104 so that the affected part of the subject P1 is placed on the portable FPD 104. At this time, in the portable FPD 104, the displacement detection circuit 104b detects the movement amount of the portable FPD 104 from the reference position at any time, and detects the movement amount from the reference position (step 103). Then, after the position adjustment of the portable FPD 104 is completed, the operator depresses the positioning switch (step 104).

  When the positioning switch is pressed by the operator, the processing circuit 112 causes the portable top panel 106 to move the portable FPD 104 based on the position information of the reference position and the movement amount of the portable FPD 104 from the reference position at the time when the positioning switch is pressed. The position information and rotation information of the FPD 104 are calculated (step 105). Further, the processing circuit 112 uses the calculated position information and rotation information of the portable FPD 104 to set the position and rotation amount of the X-ray source 101 so that the X-ray source 101 is aligned with the moved portable FPD 104 (step). 106). For example, the processing circuit 112 sets the position and rotation amount of the X-ray source 101 so that the X-ray irradiation range matches the X-ray detection range of the portable FPD 104 after movement. Then, the processing circuit 112 operates the drive device in accordance with the set position and rotation amount, and adjusts the position and orientation of the X-ray source 101 (step 107).

  Then, the processing circuit 112 determines whether the X-ray irradiation range and the X-ray detection range match (step 108). Here, if the X-ray irradiation range and the X-ray detection range do not match due to the movement of the portable FPD 104 along with the movement of the subject P1 (No in step 108), the processing circuit 112 again returns to step 104. Move to. The determination as to whether or not the portable FPD 104 has moved is made based on, for example, the amount of movement received from the transmission circuit 104c. For example, the processing circuit 112 determines that the portable FPD 104 has moved when the movement amount received from the transmission circuit 104c exceeds a predetermined threshold after the positioning switch is pressed.

  On the other hand, when the X-ray irradiation range and the X-ray detection range match (Yes in step 108), the processing circuit 112 determines whether or not a driving operation regarding fine adjustment has been received from the operator (step 109). For example, the operator confirms the X-ray irradiation range at the position and orientation of the X-ray source 101 after adjustment by the processing circuit 112 with the irradiation field lamp irradiated on the subject P1 and finely adjusts the X-ray irradiation range. Determine whether to do or not. To give an example, the operator confirms the X-ray irradiation range with an irradiation field lamp so that X-rays are not irradiated to areas other than the affected area, and when a site other than the affected area is included in the X-ray irradiation area, Judge that fine adjustment will be performed. Here, when it is determined that the X-ray irradiation range is to be finely adjusted, the operator refers to the irradiation field lamp, for example, and performs a driving operation for changing the position and the direction of the X-ray source 101 and a diaphragm blade. The driving operation for adjusting the opening degree of is executed. When a driving operation is received from the operator (Yes at Step 109), the processing circuit 112 drives the driving device to control the position and orientation of the X-ray source 101, or the X-ray diaphragm device 103 according to the received operation. It is driven to control the opening of the diaphragm blade (step 110).

  The processing circuit 112 determines whether or not the exposure button is pressed after the end of step 110 or when the driving operation is not accepted from the operator (No at step 109) (step 111). If the exposure button is not pressed here (No at Step 111), the processing circuit 112 enters a standby state. On the other hand, when the exposure button is pressed (Yes at Step 111), the processing circuit 112 irradiates the subject P1 with X-rays to capture an X-ray image (Step 112), and ends the processing. .

  The processing circuit 112 sets the position of the tabletop 106, the diaphragm opening of the X-ray diaphragm device 103, the rotation amount of the X-ray diaphragm device 103, and the like in step 106, and in step 107, the bed driving device 108 and the X-ray driver device 108. It may be a case where the line drawing device 103 is driven. Further, the processing circuit 112 may receive the position of the top plate 106, the rotation amount of the X-ray diaphragm device 103, and the like as a driving operation from the operator in step 109. Further, the processing circuit 112 may operate the bed driving device 108 in step 110. Note that the driving operation from the operator in step 109 and the driving of the driving device and the X-ray diaphragm device 103 in step 110 may not be performed.

  Further, the processing circuit 112 may calculate the position information of the portable FPD 104 with respect to the top plate 106 instead of calculating the rotation information of the portable FPD 104 with respect to the top plate 106 in step 105. Further, in such a case, the displacement detection circuit 104b may include only one sensor for detecting the movement of the portable FPD 104.

  As described above, according to the first embodiment, the portable FPD 104 detects the X-ray emitted from the X-ray tube 102. The portable FPD 104 and the subject P1 are placed on the top plate 106. The calculation function 112a calculates the position information of the portable FPD 104 with respect to the top plate 106. The control function 112b sets an irradiation condition related to the X-ray irradiation range based on the position information calculated by the calculation function 112a and the position information of the X-ray tube 102 with respect to the top plate 106, and X is set under the set irradiation condition. Irradiate a line.

  Here, the control function 112b acquires the position information of the portable FPD 104 with respect to the X-ray tube 102 based on the position information of the portable FPD 104 with respect to the top plate 106 and the position information of the X-ray tube 102 with respect to the top plate 106, and X It is possible to set the irradiation condition related to the irradiation range of the line. Therefore, the X-ray diagnostic apparatus 1 according to the first embodiment can reduce the work load on the operator and improve the inspection efficiency by automating the adjustment of the irradiation condition related to the X-ray irradiation range. .

  Further, according to the first embodiment, the control function 112b calculates the amount of deviation between the X-ray irradiation range and the X-ray detection range of the portable FPD 104 by using the position information of the portable FPD 104 with respect to the X-ray tube 102, The irradiation condition related to the X-ray irradiation range is set so as to correct the deviation amount. Therefore, the X-ray diagnostic apparatus 1 according to the first embodiment can set the irradiation conditions so that the X-ray detection range includes the X-ray irradiation range, and avoids unnecessary exposure to the subject P1. be able to.

  Further, according to the first embodiment, the control function 112b sets the irradiation condition related to the X-ray irradiation range in consideration of the rotation information in addition to the position information of the portable FPD 104. Therefore, the X-ray diagnostic apparatus 1 according to the first embodiment causes the X-ray irradiation range and the X-ray detection range to coincide with each other, even when the portable FPD 104 rotates on the top plate 106, so that the subject P1 can be detected. While avoiding unnecessary exposure, it is possible to improve the inspection efficiency by performing imaging by making maximum use of the X-ray detection range of the portable FPD 104.

  Further, the X-ray diagnostic apparatus 1 according to the first embodiment automatically aligns the X-ray detection range and the X-ray irradiation range after the operator freely moves the position of the portable FPD 104 on the top plate 106. Done in. Therefore, according to the first embodiment, for example, even in the examination on the subject P1 who cannot move, the operator can freely move the position of the portable FPD 104 without moving the subject P1 to move the affected part and the portable part. The alignment with the FPD 104 can be performed, and the inspection efficiency can be improved.

  Further, in the X-ray diagnostic apparatus 1 according to the first embodiment, the processing circuit 112 sets the irradiation condition related to the X-ray irradiation condition based on the information on the movement amount transmitted from the portable FPD 104. Therefore, for example, even when there is an X-ray diagnostic apparatus that does not include a portable FPD and the portable FPD 104 is additionally used for such an X-ray diagnostic apparatus, the processing circuit 112 relates to the X-ray irradiation condition. The irradiation conditions can be set automatically and the inspection efficiency can be improved.

  Further, the X-ray diagnostic apparatus 1 according to the first embodiment sets the irradiation condition related to the X-ray irradiation range by calculating the position information of the portable FPD 104 with respect to the top plate 106. That is, since the position information of the portable FPD 104 is calculated by sensing between the top plate 106 and the portable FPD 104 that are in close contact with each other at the time of imaging, the X-ray diagnostic apparatus 1 according to the first embodiment uses the radio wave transmitted through the subject P1. The position information of the portable FPD 104 can be calculated without being limited to sensing of ultrasonic waves, magnetic flux, and the like.

  Further, the X-ray diagnostic apparatus 1 according to the first embodiment does not require a configuration that can affect the X-rays that pass through the top plate 106. Therefore, the portable FPD 104 is removed from the top plate 106, and thus the X-ray detector is obtained. Photography can be performed using 107. Therefore, the X-ray diagnostic apparatus 1 according to the first embodiment can select which of the portable FPD 104 or the X-ray detector 107 is used for the detection of X-rays, depending on the purpose of the inspection, thereby improving the inspection efficiency. Can be improved.

(Second embodiment)
Now, the first embodiment has been described so far, but it may be implemented in various different forms other than the first embodiment described above.

  In the above-described first embodiment, the case where the portable FPD 104 includes the displacement detection circuit 104b that detects the movement amount of the portable FPD 104 has been described. However, the embodiment is not limited to this. For example, as shown in FIG. 8, a frame 205 that can be attached to the portable FPD 204 detects a movement amount of the portable FPD 204 on the top plate 106. Good. Hereinafter, an example of the portable FPD 204 according to the second embodiment will be described with reference to FIG. 8. Note that FIG. 8 is a diagram showing an example of the portable FPD according to the second embodiment.

  For example, the portable FPD 204 according to the second embodiment includes an X-ray detection circuit 104a and a transmission circuit 104c, the X-ray detection circuit 104a detects X-ray two-dimensional intensity distribution data, and the transmission circuit 104c is an X-ray. The two-dimensional intensity distribution data detected by the detection circuit 104a is transmitted to the processing circuit 112. Further, as shown in FIG. 8, a frame 205 is attached to the portable FPD 204 according to the second embodiment. The frame 205 includes a displacement detection circuit 104b and a transmission circuit 104c. The displacement detection circuit 104b detects a movement amount of the portable FPD 204 on the top plate 106 by a movement detection sensor (for example, an optical sensor), and the transmission circuit 104c. Sends the movement amount detected by the displacement detection circuit 104b to the processing circuit 112. The calculation function 112a according to the second embodiment calculates the coordinates corresponding to the entire range of the portable FPD 204 or the coordinates corresponding to the X-ray detection range based on the coordinates of the reference position and the movement amount. Information on the mounting position of the portable FPD 204 with respect to the frame 205 is stored in the storage circuit 111 in advance.

  As described above, according to the second embodiment, the frame 205 attached to the portable FPD 204 detects the movement amount of the portable FPD 204 on the top plate 106, and the calculation function 112a determines the position information of the portable FPD 204 with respect to the top plate 106. To calculate. Therefore, even when the portable FPD 204 does not have a sensor for detecting movement, by attaching the frame 205 to the portable FPD 204, the X-ray diagnostic apparatus 1 according to the second embodiment can detect the position information of the portable FPD 204. And the irradiation condition related to the X-ray irradiation range is set, so that the inspection efficiency can be improved.

  In the above-described first and second embodiments, the case where the X-ray is detected by the FPD and the X-ray image is generated has been described. However, the embodiment is not limited to this, and for example, an X-ray image may be generated using an image recording medium such as a film or an imaging plate. As an example, the cassette equipped with a film or an imaging plate includes a displacement detection circuit 104b and a transmission circuit 104c, and detects the amount of movement of the cassette on the top plate 106, whereby the X-ray diagnostic apparatus 1 The position of the cassette with respect to the top plate 106 can be calculated, and the irradiation condition relating to the X-ray irradiation range can be set based on the calculated position information of the cassette.

  Further, in the above-described first and second embodiments, the case has been described in which the control function 112b sets the irradiation condition related to the X-ray irradiation range and irradiates the X-ray under the set irradiation condition. However, the embodiment is not limited to this. For example, the operator may set the positional relationship between the X-ray tube 102 and the portable FPDs 104 and 204. As an example, when the operator manually sets the X-ray irradiation range, the control function 112b calculates a deviation amount between the X-ray irradiation range and the X-ray detection range, and the calculated deviation amount is a predetermined value. When the value is larger than the above value, the X-ray is not emitted. In this case, while the operator is adjusting the X-ray irradiation range, the control function 112b determines the positional relationship and displays a sound or screen display that the X-ray irradiation range and the X-ray detection range match. The operator can be notified by, for example,

  Further, in the above-described first and second embodiments, the case where the displacement detection circuit 104b detects the amount of movement of the portable FPDs 104 and 204 and the processing circuit 112 calculates the position information of the portable FPDs 104 and 204 with respect to the top plate 106 is described. explained. However, the embodiment is not limited to this. For example, the displacement detection circuit 104b calculates the position information of the portable FPDs 104 and 204 with respect to the top plate 106 based on the movement amount of the portable FPDs 104 and 204, and the transmission circuit. 104c may be a case where the positional information of the portable FPDs 104 and 204 with respect to the top plate 106 is transmitted to the processing circuit 112.

  Further, in the above-described first and second embodiments, the portable FPD 104 for the tabletop 106, based on the position information of the reference position on the tabletop 106 and the movement amount of the portable FPDs 104, 204 from the reference position, Although the position information of 204 has been calculated, the embodiment is not limited to this. For example, the X-ray diagnostic apparatus includes a light source that horizontally emits a light beam and a sensor that detects the light beam, and the sensor detects that the light beam is blocked by the portable FPD, whereby the position of the portable FPD 104 with respect to the top plate 106. Information can be calculated.

  Further, for example, in FIG. 5, three reference positions A to C are displayed, but by increasing the number of reference positions sufficiently, the reference position under the affected part of the subject is selected and the portable FPD 104 is displayed. By setting, the position information of the portable FPD 104 with respect to the top plate 106 can be calculated without detecting the movement amount of the portable FPD 104.

  Each component of each device according to the first and second embodiments is functionally conceptual, and does not necessarily have to be physically configured as illustrated. That is, the specific form of distribution / integration of each device is not limited to the one shown in the figure, and all or part of the device may be functionally or physically distributed / arranged in arbitrary units according to various loads and usage conditions. Can be integrated and configured. Furthermore, all or arbitrary parts of the processing functions performed by each device can be realized by a CPU and a program that is analyzed and executed by the CPU, or can be realized as hardware by a wired logic.

  Further, the control methods described in the first and second embodiments can be realized by executing a control program prepared in advance on a computer such as a personal computer or a workstation. This control program can be distributed via a network such as the Internet. The control program can also be executed by being recorded in a computer-readable recording medium such as a hard disk, a flexible disk (FD), a CD-ROM, an MO, or a DVD, and being read from the recording medium by the computer.

  According to at least one embodiment described above, the efficiency of inspection using a portable X-ray detector can be improved.

  Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications 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.

1 X-ray diagnostic device 104 Portable FPD
104a X-ray detection circuit 104b Displacement detection circuit 104c Transmission circuit 112 Processing circuit 112a Calculation function 112b Control function 112c Image generation function

Claims (8)

An X-ray detector for detecting X-rays emitted from the X-ray tube,
A top plate on which the X-ray detector and the subject are placed;
A calculation unit that calculates position information of the X-ray detector with respect to the top plate;
Based on the position information calculated by the calculation unit and the position information of the X-ray tube with respect to the top plate, irradiation conditions relating to the irradiation range of X-rays are set, and the X-rays are irradiated under the set irradiation conditions. With a control unit ,
The X-ray detector further includes a displacement detector that detects a movement amount on the top plate,
An X-ray diagnostic apparatus , wherein the calculator calculates position information of the X-ray detector based on position information of a reference position on the top plate and the movement amount .   The control unit sets the irradiation condition so that the detection range of the X-ray detector includes the irradiation range of the X-ray, and causes the X-ray to be irradiated under the set irradiation condition. X-ray diagnostic device. The X-ray detector is provided with a plurality of the displacement detectors,
The X-ray according to claim 1 or 2 , wherein the calculation unit further calculates rotation information of the X-ray detector with respect to the tabletop, based on a movement amount detected by each of the plurality of displacement detection units. Diagnostic device. The calculating unit sets the position selected by the operator from among a plurality of positions on the top plate as the reference position, X-rays diagnostic apparatus according to claim 2 or 3. The X-ray diagnosis according to claim 2 , wherein the displacement detection unit includes a light receiving sensor, and detects the movement amount based on a pattern on the surface of the top plate identified by the light receiving sensor. apparatus. The displacement detecting unit comprises a ball, on the basis of the rotation of the ball on the top plate, calculates the amount of movement, X-rays diagnostic apparatus according to any one of claims 2 to 4. The control unit, as the irradiation conditions, includes a position of the top plate, a position of the X-ray tube, a rotation amount of the X-ray tube, a diaphragm opening of the X-ray diaphragm device, and a rotation amount of the X-ray diaphragm device. setting at least one 1, X-ray diagnostic apparatus according to any one of claims 1 to 6. An X-ray detector for detecting X-rays emitted from an X-ray tube,
A displacement detector that detects the amount of movement on the top plate on which the X-ray detector and the subject are placed ;
Based on the position information and the movement amount of the reference position on the top plate, X-rays detector and a calculation unit for calculating a position information of the X-ray detector.

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