JP2013244148A - X-ray ct apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of noncontact data transmission between a rotation part and a fixed part by a simple configuration.SOLUTION: An X-ray CT apparatus includes an X-ray generation part for exposing a subject to X-rays, and an X-ray detection part for detecting the X-rays transmitted through the subject and outputting detection data. The X-ray CT apparatus includes a rotation part, a fixed part, an image data conversion part, a display part, an imaging part, and a detection data conversion part. The rotation part supports the X-ray generation part and the X-ray detection part, and is rotated on a circular orbit centering on the subject. The fixed part rotatably holds the rotation part to the subject. The image data conversion part is provided in the rotation part and converts the detection data to identifiable image data. The display part is provided on the outer periphery of the rotation part and displays an image based on the image data. The imaging part is provided in the fixed part and captures the image displayed at the display part. The detection data conversion part converts the captured image to the detection data.

Description

  Embodiments described herein relate generally to an X-ray CT apparatus.

  An X-ray CT (Computed Tomography) apparatus is an apparatus that scans a subject using X-rays and processes the collected data by a computer, thereby imaging the inside of the subject.

  Specifically, the X-ray CT apparatus emits X-rays generated from an X-ray tube to a subject multiple times from different directions, and detects X-rays transmitted through the subject with an X-ray detector. To collect multiple detection data. The collected detection data is A / D converted by the data collection unit, and then transmitted from the rotation unit to which the X-ray tube and the detector are attached to a fixed unit that holds the rotation unit. Then, the detection data is transmitted from the fixed unit to the console device. The console device pre-processes the detection data and creates projection data. Then, the console device performs reconstruction processing based on the projection data, and creates tomographic image data or volume data based on a plurality of tomographic image data.

  Here, in order to transmit the detection data from the rotating rotating part to the fixed part, a non-contact data transmitting means is used. Non-contact data transmission means includes, for example, means using electrostatic coupling and means using light.

JP 2009-247522 A

  However, in the case of data transmission means using light, dedicated parts such as a transmission unit that outputs light of a special wavelength and a reception unit that receives light output from the transmission unit are required for data transmission. In the case of data transmission means using electrostatic coupling, dedicated parts such as a transmitting antenna and a receiving antenna are required. Furthermore, the transmitting antenna and the receiving antenna must be arranged so as to ensure electrostatic coupling. That is, the conventional data transmission means has a problem that the configuration is complicated.

  Embodiments have been made to solve the above-described problems, and an object thereof is to provide an X-ray CT apparatus capable of non-contact data transmission between a rotating unit and a fixed unit with a simple configuration. .

  The X-ray CT apparatus according to the embodiment includes an X-ray generation unit that emits X-rays to a subject, and an X-ray detection unit that detects X-rays transmitted through the subject and outputs detection data. The X-ray CT apparatus includes a rotation unit, a fixed unit, an image data conversion unit, a display unit, an imaging unit, and a detection data conversion unit. The rotation unit supports the X-ray generation unit and the X-ray detection unit, and rotates in a circular orbit around the subject. The fixing unit holds the rotating unit rotatably with respect to the subject. The image data conversion unit is provided in the rotation unit and converts the detection data into identifiable image data. The display unit is provided on the outer periphery of the rotating unit and displays an image based on the image data. The imaging unit is provided in the fixed unit and captures an image displayed on the display unit. The detection data conversion unit converts the captured image into detection data.

1 is a block diagram of an X-ray CT apparatus according to a first embodiment. 1 is a block diagram showing a data transmission system according to a first embodiment. It is a figure which supplements description of the data transmission system which concerns on 1st Embodiment. It is a figure which supplements description of the data transmission system which concerns on 1st Embodiment. It is a figure which supplements description of the data transmission system which concerns on 1st Embodiment. It is a figure which supplements description of the data transmission system which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of the X-ray CT apparatus which concerns on 1st Embodiment. It is a block diagram which shows the data transmission system which concerns on 2nd Embodiment. It is a flowchart which shows operation | movement of the X-ray CT apparatus which concerns on 2nd Embodiment. FIG. 10 is a block diagram showing a data transmission system according to modification example 1;

(First embodiment)
The configuration of the X-ray CT apparatus 1 according to the first embodiment will be described with reference to FIGS.

<Device configuration>
As shown in FIG. 1, the X-ray CT apparatus 1 includes a gantry device 10, a bed device 30, and a console device 40.

[Mounting device]
The gantry device 10 is an apparatus that irradiates the subject E with X-rays and collects detection data of the X-rays transmitted through the subject E. The gantry device 10 includes a rotating unit 10a and a fixed unit 10b.

  The rotation unit 10 a includes an X-ray generation unit 11, an X-ray detection unit 12, an X-ray diaphragm unit 13, and a data collection unit 14.

  The rotation unit 10a is a member that supports the X-ray generation unit 11, the X-ray detection unit 12, and the like. The rotation unit 10a supports the X-ray generation unit 11 and the X-ray detection unit 12 so as to face each other with the subject E interposed therebetween. The rotating unit 10 a rotates in a circular orbit around the subject E in the gantry device 10.

  The X-ray generator 11 includes an X-ray tube that generates X-rays (for example, a vacuum tube that generates a conical or pyramidal beam (not shown)). The generated X-ray is exposed to the subject E. That is, the X-ray generator 11 emits X-rays to the subject E.

  The X-ray detection unit 12 includes a plurality of X-ray detection elements (not shown). The X-ray detection unit 12 detects X-ray intensity distribution data (hereinafter sometimes referred to as “detection data”) indicating the intensity distribution of X-rays transmitted through the subject E with an X-ray detection element, and the detection data is Output as a current signal. That is, the X-ray detection unit 12 detects X-rays that have passed through the subject E and outputs detection data. As the X-ray detection unit 12, for example, a two-dimensional X-ray detector (plane detector) in which a plurality of detection elements are arranged in two directions (slice direction and channel direction) orthogonal to each other is used. The plurality of X-ray detection elements are provided, for example, in 320 rows along the slice direction. By using a multi-row X-ray detector in this way, it is possible to image a three-dimensional imaging region having a width in the slice direction by one rotation scan (volume scan). The slice direction corresponds to the body axis direction of the subject E, and the channel direction corresponds to the rotation direction of the X-ray generation unit 11.

  The X-ray diaphragm 13 has a slit (opening) with a predetermined width, and by changing the width of the slit, the X-ray fan angle (divergence angle in the channel direction) of the X-rays exposed from the X-ray generator 11 and the X-ray Adjust the cone angle of the line (the spread angle in the slice direction).

  The data collection unit 14 (DAS: Data Acquisition System) collects detection data from the X-ray detection unit 12 (each X-ray detection element). Further, the data collection unit 14 converts the collected detection data into digital data, and transmits the digital data to the data transmission system 18 (first storage area 18a (described later)). The detection data described below is digital data.

  The fixing unit 10b holds the rotating unit 10a rotatably with respect to the subject E. The fixing unit 10 b includes a high voltage generation unit 15, a gantry driving unit 16, and an aperture driving unit 17.

  The high voltage generator 15 applies a high voltage to the X-ray generator 11. The X-ray generator 11 generates X-rays based on the high voltage. The gantry driving unit 16 drives the rotation unit 10a to rotate. The diaphragm drive unit 17 drives the X-ray diaphragm unit 13 so that the X-rays generated by the X-ray generation unit 11 have a predetermined shape.

  In the present embodiment, a data transmission system 18 is formed between the rotating unit 10a and the fixed unit 10b. Here, the details of the data transmission system 18 will be described with reference to FIGS. 2 to 4C. FIG. 2 is a block diagram showing a detailed configuration of the data transmission system 18. FIG. 3 is a perspective view of the rotating unit 10a. In FIG. 3, some components such as the X-ray generation unit 11 and the X-ray detection unit 12 supported by the rotation unit 10a are omitted. 4A to 4C are schematic views of the rotating unit 10a as viewed from the front.

  The data transmission system 18 transmits detection data from the rotating unit 10a to the fixed unit 10b in a non-contact manner. The data transmission system 18 includes a first storage area 18a, an image data conversion unit 18b, a display unit 18c, an imaging unit 18d, a detection data conversion unit 18e, a second storage area 18f, and a transmission control unit 18g. Have. In the data transmission system 18, the first storage area 18a, the image data conversion unit 18b, and the display unit 18c are provided in the rotation unit 10a. On the other hand, the imaging unit 18d, the detection data conversion unit 18e, the second storage area 18f, and the transmission control unit 18g are provided in the fixed unit 10b.

  The first storage area 18 a is provided in the rotation unit 10 a and stores the detection data collected by the data collection unit 14.

  The image data conversion unit 18b is provided in the rotation unit 10a and converts detection data into identifiable image data. In other words, the image data conversion unit 18b has a role as an encoder that converts detection data into image data based on a certain rule. As a specific process for converting the detection data into the image data, a known method can be used. “Image data” is data from which detection data is displayed as an image. As the “image”, for example, an arbitrary identifier such as a barcode, a QR code (registered trademark), a color code, or a three-dimensional code can be selected according to the amount of detected data. “Image data that can identify detection data” is image data that reflects the data content indicated by the detection data, and an image based on the image data may be converted into detection data indicating the original data content. It is possible data. A configuration in which the first storage area 18a is provided after the image data converter 18b is also possible. In this case, the first storage area 18a stores the image data converted by the image data converter 18b.

  The display unit 18c is provided on the outer periphery of the rotating unit 10a and displays an image based on the image data. The display unit 18c is configured by an arbitrary display device such as an organic EL (Electro-Luminescence), an LCD (Liquid Crystal Display), or the like. In this embodiment, the display part 18c is provided in a part of outer periphery of the rotation part 10a (refer FIG. 3).

  In addition, the display part 18c may be provided over the perimeter of the outer periphery of the rotation part 10a. Or the display part 18c is not restricted to one. A plurality of display units 18c may be provided on the outer periphery of the rotating unit 10a.

  The imaging unit 18d is provided in the fixed unit 10b and captures an image displayed on the display unit 18c. The imaging unit 18d is provided at a position where the image displayed on the display unit 18c can be captured (in the vicinity of the rotating unit 10a) (see FIG. 3). In FIG. 3, the imaging unit 18d is positioned below the rotating unit 10a. Is placed). When the imaging unit 18d captures an image displayed on the display unit 18c, detection data corresponding to the image moves from the rotating unit 10a to the fixed unit 10b. That is, the data transmission system 18 enables non-contact data transmission. Note that the timing at which the imaging unit 18d captures an image displayed on the display unit 18c is different from the timing at which the X-ray detection unit 12 detects detection data.

  The imaging unit 18d includes, for example, an imaging element 181d and an optical system 182d. The image sensor 181d captures an image displayed on the display unit 18c. The image sensor 181d is an image sensor such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The optical system 182d guides the image displayed on the display unit 18c to the image sensor 181d. The optical system 182d is formed of a lens group including, for example, a wide angle lens. Note that a plurality of imaging units 18d may be provided.

  The detection data conversion unit 18e converts the captured image into detection data. In other words, the detection data conversion unit 18e serves as a decoder that converts an image (image data) captured by the imaging unit 18d into original detection data. A known process can be used for specific processing for converting image data into detection data.

  The second storage area 18f is provided in the fixed unit 10b and stores the detection data converted by the detection data conversion unit 18e.

  The transmission control unit 18 g performs overall control of the data transmission system 18 by controlling each unit provided in the data transmission system 18. For example, the transmission control unit 18g transmits detection data from the first storage area 18a to the image data conversion unit 18b. Further, the transmission control unit 18g transmits detection data from the second storage area 18f to the console device 40. Note that the amount of detection data to be transmitted is set in advance. For example, the transmission control unit 18g may transmit detection data corresponding to a plurality of scans collectively, or detection data corresponding to one row of detection elements among detection data obtained by one rotation scan. May be sent only. At this time, a control signal (for example, a signal for transmitting detection data from the first storage area 18a to the image data conversion unit 18b) from the transmission control unit 18g to the rotation unit 10a is transmitted in a non-contact manner.

Furthermore, the transmission control unit 18g in the present embodiment controls the timing at which an image is displayed on the display unit 18c and the timing at which the imaging unit 18d captures an image. A specific example will be described with reference to FIG. 4A. In FIG. 4A, the case where there is one imaging unit 18d will be described. The image I ₁ based on the detection data D ₁ is displayed on the display unit 18c. The rotating unit 10a rotates (scans) in the direction of the arrow based on the control of the console device 40, and sequentially acquires detection data (detection data D ₁ , D ₂ , D ₃ ... D _n ). The first storage area 18a stores detection data acquired sequentially.

In this case, transmission control unit 18g controls the imaging unit 18d so that the display unit 18c starts capturing images I ₁ at the timing when reaching the imaging unit 18d (position alpha). Then, the transmission control unit 18g controls the imaging unit 18d so as to end imaging at the timing when the display unit 18c passes the imaging unit 18d (position β). In addition, the transmission control unit 18g instructs the first storage area 18a and the image data conversion unit 18b in an arbitrary period after the display unit 18c passes the position β and then reaches the position α to detect the next detection. and it displays the image _{I 2} based on the data _{D 2} to the display unit 18c. For example, the transmission control unit 18g detects the arrival timing to the position α and the passage timing of the position β based on the output of the position detection device (not shown).

Next, with reference to FIG. 4B and FIG. 4C, the control of the transmission control unit 18g when there are a plurality of imaging units 18d will be described. 4B and 4C illustrate an example in which the imaging unit 18d and the imaging unit 18d ′ are provided to face each other with the rotating unit 10a interposed therebetween. Further, the image I ₁ based on the detection data D ₁ is displayed on the display unit 18c. The rotating unit 10a rotates (scans) in the direction of the arrow based on the control of the console device 40, and sequentially acquires detection data (detection data D ₁ , D ₂ , D ₃ ... D _n ). The first storage area 18a stores detection data acquired sequentially.

In this case, transmission control unit 18g controls the imaging unit 18d so that the display unit 18c starts capturing images I ₁ at the timing when reaching the imaging unit 18d (position alpha). Then, the transmission control unit 18g controls the imaging unit 18d so as to end imaging at the timing when the display unit 18c passes the imaging unit 18d (position β). In addition, the transmission control unit 18g gives an instruction to the first storage area 18a and the image data conversion unit 18b in an arbitrary period after the display unit 18c passes through the position β to reach the imaging unit 18d ′ (position γ). Then, the image I ₂ based on the next detection data D ₂ is displayed on the display unit 18c (see FIG. 4B). Transmission control unit 18g controls the imaging unit 18d' to start capturing of an image I ₂ at a timing when the display unit 18c has reached the position gamma. Then, the transmission control unit 18g controls the imaging unit 18d ′ so as to end the imaging at the timing when the display unit 18c passes the imaging unit 18d ′ (position δ). Further, the transmission control unit 18g instructs the first storage area 18a and the image data conversion unit 18b in an arbitrary period after the display unit 18c passes the position δ to reach the position α, and the next detection data D and displays the image _{I 3} on the display unit 18c based on ₃ (see FIG. 4C).

The transmission control unit 18g controls the imaging unit 18d to always perform imaging, instructs the first storage area 18a and the image data conversion unit 18b, and sequentially displays images based on the detection data on the display unit 18c. It is also possible. Based on the example of FIG. 4A, the transmission control unit 18g causes the imaging unit 18d to always image the outer periphery of the rotating unit 10a. Further, the transmission control unit 18g sequentially switches the images based on the detection data (images I ₁ , I ₂ ...) In an arbitrary period after the display unit 18c passes the position β and then reaches the position α. -I _n ) Display on the display unit 18 c. Whether or not the display unit 18c has passed the position α and the position β can be specified by the imaging result of the imaging unit 18d. That is, the amount of light incident on the imaging unit 18d differs between when the display unit 18c is imaged and when the other peripheral portion of the rotating unit 10a is imaged. Therefore, the transmission control unit 18g performs image switching based on the change in the light amount.

In addition, when there are a plurality of imaging units, the transmission control unit 18g may perform control for capturing the same image with each imaging unit. Referring to the example of FIG. 4B and FIG. 4C, transmission control unit 18g the image _{I 1} is imaged in the imaging unit 18d and the imaging unit 18D'. Further, the transmission control unit 18g instructs the first storage area 18a and the image data conversion unit 18b in an arbitrary period after the display unit 18c passes the position σ to reach the position α, and the next detection data D and displays the image _{I 2} based on ₂ to the display unit 18c. The transmission control unit 18g the image _{I 2} is imaged in the imaging unit 18d and the imaging unit 18D'. In this way, by capturing the same image with a plurality of imaging units, for example, even when the imaging unit 18d cannot capture an image due to an error, detection data based on the image captured by the imaging unit 18d ′ Can be used. Therefore, the problem that the detection data is lost can be solved.

  Furthermore, the transmission control unit 18g adjusts the shutter speed at which the imaging unit 18d captures an image based on the preset rotation speed of the rotation unit 10a. Different values corresponding to the scan plan and the like are set in advance for the speed of the rotating unit 10a. For example, if the rotation speed is increased, the time for the display unit 18c provided in the rotation unit 10a to pass through the imaging unit 18d is also shortened. Therefore, the transmission control unit 18g performs control to increase the shutter speed. By performing such control, the imaging unit 18d can reliably capture the image displayed on the display unit 18c even when the rotation speed changes. The scan plan is information including conditions for controlling the rotation unit 10a, the X-ray generation unit 11, the X-ray detection unit 12, and the like for scanning with the X-ray CT apparatus 1.

  In addition, when the imaging unit 18d performs imaging in a state where X-rays are exposed, an error may occur due to the influence of noise caused by the X-rays. Therefore, the transmission control unit 18g can cause the imaging unit 18d to perform imaging at a timing other than the timing of the X-ray exposure by the X-ray generation unit 11. The timing of X-ray exposure is set in advance by a scan plan or the like.

[Bed equipment]
The couch device 30 is a device for placing and moving the subject E to be imaged.

[Console device]
The console device 40 is used for operation input to the X-ray CT apparatus 1. The console device 40 has a function of reconstructing CT image data (tomographic image data and volume data) representing the internal form of the subject E based on the detection data transmitted from the data transmission system 18. Yes. Further, the console device 40 controls various operations related to the X-ray scan. For example, the console device 40 has a function of controlling the high voltage generator 15 so that a high voltage is applied to the X-ray generator 11. The console device 40 has a function of controlling the gantry driving unit 16 to rotationally drive the rotating unit 10a. The console device 40 has a function of controlling the aperture driving unit 17 so as to operate the X-ray aperture unit 13.

<Operation>
Next, the operation of the X-ray CT apparatus 1 according to the present embodiment will be described with reference to FIG.

  The X-ray generation unit 11 emits X-rays to the subject E. The X-ray detection unit 12 detects X-rays that have passed through the subject E, and acquires the detection data (S10). The detection data acquired in S10 is temporarily stored in the first storage area 18a.

  The transmission control unit 18g causes detection data to be transmitted from the first storage area 18a to the image data conversion unit 18b. The image data converter 18b converts the detected data into identifiable image data (S11).

  The transmission control unit 18g causes the display unit 18c to display an image based on the image data converted in S11 (S12).

  The transmission control unit 18g causes the imaging unit 18d to capture an image based on the image data displayed on the display unit 18c (S13).

  The detection data conversion unit 18e converts the captured image (image data) into detection data (S14). The detection data converted in S14 is temporarily stored in the second storage area 18f. Then, the transmission control unit 18g causes detection data to be transmitted from the second storage area 18f to the console device 40 at an arbitrary timing.

  In addition, by improving the performance of the display unit 18c and the imaging unit 18d, it is possible to increase the speed of data transmission with the same installation area. Therefore, even if the expansion of the functions of the X-ray CT apparatus is realized in the future, such as high-speed detection data acquisition or large detection data capacity, data transmission is performed using the display unit 18c and the imaging unit 18d. Can be speeded up. On the other hand, conventional data transmission means (SureCom, etc.) need to be provided with a plurality of data transmission means according to the expansion of functions. In other words, the conventional data transmission means is not configured to cope with future expansion of the function of the X-ray CT apparatus. On the other hand, the X-ray CT apparatus 1 having the data transmission system 18 described in the present embodiment has a configuration that can cope with future function expansion.

<Action and effect>
The operation and effect of this embodiment will be described.

  The X-ray CT apparatus 1 of the present embodiment detects an X-ray generation unit 11 that emits X-rays to a subject E, and X-ray detection that detects X-rays transmitted through the subject E and outputs detection data. Part 12. The X-ray CT apparatus 1 includes a rotation unit 10a, a fixed unit 10b, an image data conversion unit 18b, a display unit 18c, an imaging unit 18d, and a detection data conversion unit 18e. The rotation unit 10 a supports the X-ray generation unit 11 and the X-ray detection unit 12 and rotates in a circular orbit around the subject E. The fixing unit 10b holds the rotating unit 10a rotatably with respect to the subject E. The image data conversion unit 18b is provided in the rotation unit 10a and converts detection data into identifiable image data. The display unit 18c is provided on the outer periphery of the rotating unit 10a and displays an image based on the image data. The imaging unit 18d is provided in the fixed unit 10b and captures an image displayed on the display unit 18c. The detection data conversion unit 18e converts the captured image into detection data.

  In this way, when the imaging unit 10d captures the image displayed on the display unit 10c, the detection data can be sent from the rotating unit 10a to the fixed unit 10b in a non-contact manner. That is, according to the X-ray CT apparatus 1 of the present embodiment, non-contact data transmission between the rotating unit and the fixed unit is possible with a simple configuration of the imaging unit 10d and the display unit 10c. Further, the imaging unit 10d and the display unit 10c can be obtained at a lower cost than conventional data transmission means. That is, according to the configuration of the present embodiment, the price of the X-ray CT apparatus 1 can be suppressed.

(Second Embodiment)
Next, the configuration of the X-ray CT apparatus 1 according to the second embodiment will be described with reference to FIGS. 6 and 7. In the present embodiment, a configuration will be described in which it is determined whether or not an image has been correctly captured by the imaging unit 18d. Note that a detailed description of the same configuration as in the first embodiment may be omitted. Further, in the present embodiment, description will be made based on a configuration in which two imaging units 18d are provided (see FIG. 4B and the like of the first embodiment. In FIG. 6, one imaging unit (imaging unit 18d). ) Only).

  The data transmission system 18 includes a determination unit 18h. The determination unit 18h is provided in the fixed unit 10b. The determination unit 18h determines whether or not the image is correctly captured based on the image obtained by the imaging unit 18d. “The image is captured correctly” means that the detection data conversion unit 18e can convert the detection data corresponding to the image (can be restored to the original detection data). If the image is not captured correctly, the detection data conversion unit 18e cannot convert the original detection data. The reason why the image is not captured correctly includes rotational blurring of the rotating unit 10a, imaging timing, and the like.

In addition, the determination unit 18h in the present embodiment includes a comparison unit 181h. The comparison unit 181h compares one image captured by each of the plurality of imaging units. For example, in the example of FIGS. 4B and 4C of the first embodiment, the comparison unit 181h compares the image _{I 1} captured by the image _{I 1} and the imaging unit 18d' captured by the imaging unit 18d. For comparison of images, a known method such as pattern matching can be used.

Then, the determination unit 18h determines whether or not the image is correctly captured based on the comparison result by the comparison unit 181h. Specifically, if the comparison result between the two images (image I ₁ captured by the image I ₁ and the imaging unit 18d' captured by the imaging unit 18 _d) are the same is issued by the comparator unit 181h, determination unit In 18h, it is determined that the image is correctly captured. On the other hand, if the comparison unit 181h gives a comparison result indicating that the two images are different, there is a possibility that some problem has occurred during imaging by at least one of the imaging units. Therefore, the determination unit 18h determines that the image is not captured correctly.

  When the image is not correctly captured, the transmission control unit 18g in the present embodiment retransmits the detection data corresponding to the image from the first storage area 18a.

For example, if the image I ₁ is determined not to be imaged correctly, the transmission control portion 18g is to transmit the detected data D ₁ corresponding to the image I ₁ from the first memory area 18a in the image data converting unit 18b. Transmission control unit 18g is transformed image _{I 1} again on the display section 18c.

  Note that it is not always necessary to compare two images in order to determine whether or not the images are correctly captured. For example, the image data conversion unit 18b incorporates an error detection code into the data when converting the detection data into image data. Then, the determination unit 18h determines whether or not the image is correctly captured based on the error detection code included in the image data. In this case, the configuration of the comparison unit 181h is not necessary. As the error detection code, for example, a known code such as a CRC (Cyclic Redundancy Check) code can be used.

<Operation>
Next, the operation of the X-ray CT apparatus 1 according to the present embodiment will be described with reference to FIG.

  The X-ray generation unit 11 emits X-rays to the subject E. The X-ray detection unit 12 detects X-rays that have passed through the subject E and acquires the detection data (S20). The detection data acquired in S20 is temporarily stored in the first storage area 18a.

  The transmission control unit 18g causes detection data to be transmitted from the first storage area 18a to the image data conversion unit 18b. The image data converter 18b converts the detected data into identifiable image data (S21).

  The transmission control unit 18g causes the display unit 18c to display an image based on the image data converted in S11 (S22).

  The transmission control unit 18g causes the imaging unit 18d and the imaging unit 18d ′ to capture an image based on the image data displayed on the display unit 18c (S23).

  The comparison unit 181h compares the image captured by the image capturing unit 18d captured in S23 with the image captured by the image capturing unit 18d ′ (S24).

  The determination unit 18h determines whether or not the image is correctly captured based on the comparison result in S24 (S25).

  When it is determined that the image is correctly captured (Y in S26), the transmission control unit 18g transmits the image (image data) to the detection data conversion unit 18e. The detection data conversion unit 18e converts the image (image data) into detection data (S27). The detection data converted in S27 is temporarily stored in the second storage area 18f. Then, the transmission control unit 18g causes detection data to be transmitted from the second storage area 18f to the console device 40 at an arbitrary timing.

  On the other hand, when it is determined that the image has not been correctly captured (N in S26), the transmission control unit 18g retransmits the detection data corresponding to the image from the first storage area 18a to the image data conversion unit 18b. (S28).

<Action and effect>
The operation and effect of this embodiment will be described.

  The X-ray CT apparatus 1 of the present embodiment includes a first storage area 18a and a determination unit 18h. The first storage area 18a is provided in the rotating unit 10a and stores detection data. The determination unit 18h determines whether or not the image is correctly captured based on the image obtained by the imaging unit 18d. In addition, when the image is not captured correctly, the transmission control unit 18g retransmits the detection data corresponding to the image from the first storage area 18a.

  Specifically, the imaging unit 18d includes a plurality. The determination unit 18h includes a comparison unit 181h. The comparison unit 181h compares one image captured by each of the plurality of imaging units. The determination unit 18h determines whether or not an image is correctly captured based on the comparison result by the comparison unit 181h.

  As described above, the comparison unit 181h compares the images captured by the plurality of imaging units. The determination unit 18h determines whether or not an image is correctly captured based on the comparison result. Therefore, in addition to the same effects as those of the first embodiment, an error during imaging can be easily detected. If the image is not captured correctly, the transmission control unit 18g retransmits the detected data and displays the corresponding image on the display unit 18c again. Therefore, detection data can be reliably transmitted from the rotating unit 10a to the fixed unit 10b.

  In addition, the determination unit 18h in the X-ray CT apparatus 1 of the present embodiment determines whether or not an image is correctly captured based on an error detection code included in the image data.

  As described above, by using the error detection code, an error at the time of imaging can be easily detected without using a configuration having a plurality of imaging units.

(Modification 1)
In order to capture an image displayed on the display unit 18c by the imaging unit 18d, it is desirable that the display unit 18c is located at the focal point of the imaging unit 18d. That is, it is desirable that the focal distance between the imaging unit 18d and the display unit 18c is constant. However, there is a possibility that the focal length changes when an image is captured due to rotation blur of the rotating unit 10a. In this case, the captured image may be blurred, and accurate data transmission may not be performed.

  Therefore, the X-ray CT apparatus 1 in the modification has a distance detection unit 19. The distance detection unit 19 is provided in the fixed unit 10b and detects the distance between the imaging unit 18d and the rotation unit 10a. Specifically, the distance detection unit 19 irradiates light to the rotation unit 10a (display unit 18c), and detects the distance between the rotation unit 10a and the imaging unit 18d based on the reflected light.

  The transmission control unit 18g adjusts the position of the imaging unit 18d with respect to the rotation unit 10a based on the distance detected by the distance detection unit 19. The focal length between the imaging unit 18d and the rotation unit 10a is a constant value for each apparatus. Therefore, the transmission control unit 18g compares the focal length with the distance detected by the distance detection unit 19, and moves the imaging unit 18d based on the comparison result (or drives the optical system 182d to set the focal length. Change) to focus the imaging unit 18d on the rotating unit 10a.

  Moreover, a light emitting element is provided in the outer peripheral part of the rotation part 10a where the display part 18c is not provided. The imaging unit 18d images light from the light emitting element. The transmission control unit 18g calculates the distance between the imaging unit 18d and the rotating unit 10a based on the light imaged by the imaging unit 18d. Then, the transmission control unit 18g adjusts the position of the imaging unit 18d with respect to the rotation unit 10a based on the calculated distance. In this case, the distance detection unit 19 is included in the imaging unit 18d.

  Alternatively, a specific pattern can be provided instead of the light emitting element. The imaging unit 18d images a pattern. The transmission control unit 18g may adjust the focal length of the imaging unit 18d with respect to the rotating unit 10a based on the state of the pattern imaged by the imaging unit 18d (if the image is out of focus, the pattern image is blurred). Is possible.

  As described above, by adjusting the focal position, errors during imaging can be reduced. Therefore, it is possible to reliably perform non-contact data transmission.

(Modification 2)
As a configuration in which the imaging unit 18d captures an image displayed on the display unit 18c, a projector method can be applied. As a specific example, the image transfer control unit 18g projects an image based on the image data displayed on the display unit 18c. Then, the transmission control unit 18g causes the imaging unit 18d to receive (image) the projected image (that is, the image displayed on the display unit 18c).

(Modification 3)
Further, the principle of the scanner can be applied as the imaging method of the imaging unit 18d. That is, a linear CCD system that copies the image displayed on the display unit 18c can be used as the imaging method of the imaging unit 18d. By using this method, the imaging unit 18d captures an image displayed on the display unit 18c even when the distance between the display unit 18c and the imaging unit 18d is large (for example, several tens of centimeters). Can do.

<Effects common to the embodiments>
According to the X-ray CT apparatus of at least one embodiment described above, detection data can be sent from the rotating unit to the fixed unit in a non-contact manner by the imaging unit capturing an image displayed on the display unit. That is, non-contact data transmission between the rotating unit and the fixed unit is possible with a simple configuration of the imaging unit and the display unit. Also, the imaging unit and the display unit can be obtained at a lower cost than conventional data transmission means. That is, according to the configuration of the present embodiment, the price of the X-ray CT apparatus can be suppressed.

  Although several embodiments of the present 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, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 X-ray CT apparatus 10 Mounting apparatus 10a Rotation part 10b Fixed part 11 X-ray generation part 12 X-ray detection part 13 X-ray aperture part 14 Data collection part 15 High voltage generation part 16 Base drive part 17 Aperture drive part 18 Data transmission system 18a First storage area 18b Image data conversion section 18c Display section 18d Imaging section 18e Detection data conversion section 18f Second storage area 18g Transmission control section 30 Bed apparatus 40 Console apparatus

Claims (11)

An X-ray CT apparatus having an X-ray generation unit that emits X-rays to a subject, and an X-ray detection unit that detects X-rays transmitted through the subject and outputs detection data,
A rotating unit that supports the X-ray generation unit and the X-ray detection unit and rotates in a circular orbit around the subject;
A fixing unit that rotatably holds the rotating unit with respect to the subject;
An image data conversion unit that is provided in the rotation unit and converts the detection data into identifiable image data;
A display unit provided on an outer periphery of the rotating unit and displaying an image based on the image data;
An imaging unit that is provided in the fixed unit and captures the image displayed on the display unit;
A detection data converter that converts the captured image into the detection data;
An X-ray CT apparatus comprising:   The X-ray CT apparatus according to claim 1, further comprising: a transmission control unit that controls a timing at which the image is displayed on the display unit and a timing at which the imaging unit captures the image.   The X-ray CT apparatus according to claim 2, wherein the transmission control unit adjusts a shutter speed at which the imaging unit captures the image based on a preset rotational speed of the rotating unit.   The X-ray CT apparatus according to claim 2, wherein the transmission control unit causes the imaging unit to perform imaging at a timing other than the X-ray exposure timing by the X-ray generation unit. A first storage area provided in the rotating unit and storing the detection data;
A determination unit for determining whether or not the image is correctly captured based on the image obtained by the imaging unit;
Have
The said transmission control part makes the said detection data corresponding to the said image resend from the said 1st storage area, when the said image is not imaged correctly, The transmission control part as described in any one of Claims 2-4 characterized by the above-mentioned. X-ray CT system. The imaging unit consists of a plurality of
The determination unit includes a comparison unit that compares one image captured by each of the plurality of imaging units,
6. The X-ray CT apparatus according to claim 5, wherein it is determined whether or not the image is correctly captured based on a comparison result by the comparison unit.   The X-ray CT apparatus according to claim 5, wherein the determination unit determines whether or not the image is correctly captured based on an error detection code included in the image data. A distance detection unit that is provided in the fixing unit and detects a distance between the imaging unit and the rotation unit;
The X-ray CT apparatus according to claim 2, wherein the transmission control unit adjusts a position of the imaging unit with respect to the rotating unit based on the detected distance.   The X-ray CT apparatus according to claim 1, wherein the display unit is provided on a part of an outer periphery of the rotating unit.   The X-ray CT apparatus according to claim 1, wherein the display unit is provided over the entire outer periphery of the rotating unit.   The X-ray CT apparatus according to claim 1, wherein a plurality of the display units are provided on an outer periphery of the rotating unit.

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