JP5300350B2 - X-ray diagnostic apparatus and image display method thereof - Google Patents

Description

  The present invention relates to an X-ray diagnostic apparatus that performs X-ray fluoroscopy and an image display method thereof.

  In X-ray contrast examination and X-ray endovascular treatment, a doctor or the like advances a catheter or a guide wire to a target site under fluoroscopy. In the live image, blood vessels are not drawn unless enhanced with a contrast medium or the like. Therefore, there is a road map function for displaying an image (blood vessel image) photographed by flowing a contrast medium in the past and a live image in a superimposed manner. The road map has an advantage that blood vessel traveling can be grasped. However, when the bed is moved or when the arm is rotated to change the viewing direction of the fluoroscopic image, the blood vessel image must be regenerated. Reoccurrence of frequent blood vessel images leads to an increase in examination / treatment time and an increase in the contrast medium used. As a result, the burden on the patient increases.

In order to solve such a problem, a three-dimensional road map function has been developed. The three-dimensional road map uses three-dimensional blood vessel information instead of two-dimensional blood vessel information. The three-dimensional blood vessel information is displayed after volume rendering. In this volume rendering display, blood vessels are displayed three-dimensionally, such as by shading the blood vessel surface. However, since the volume rendering display is displayed in two dimensions on the screen after all, it is difficult to understand the three-dimensional structure of the blood vessel. Therefore, the procedure efficiency in the catheter procedure is poor.
US Patent Application Publication No. 2007/0201609

  An object of the present invention is to provide an X-ray diagnostic apparatus and an image display method thereof that can improve the procedure efficiency in a catheter procedure.

An X-ray diagnostic apparatus according to a first aspect of the present invention includes an imaging unit that images an object with X-rays to generate X-ray image data, and three-dimensional image data relating to a blood vessel contrasted with the object. A projection processing unit that performs projection processing and generates projection image data in which blood vessels are emphasized, and can change an observation angle of at least one of the observation angle of the generated X-ray image and the observation angle of the projection image A change operation unit; a determination unit that determines whether or not the X-ray is generated; a switching unit that can switch between a first electrical state and a second electrical state; and the determination unit An X-ray diagnostic apparatus comprising: a control unit that controls an observation angle changing operation by the changing operation unit based on a result of determination by the switching unit and switching by the switching unit , wherein X-rays are generated by the determining unit Before and When the switching unit is switched to the first electrical state, both the observation angle of the X-ray image and the observation angle of the projection image can be changed, and no X-ray is generated by the determination unit. If it is determined and the switching unit switches to the first electrical state, at least the observation angle of the X-ray image can be changed, and the determination unit determines that X-rays are being generated and the switching When the second electrical state is switched by the unit, both the observation angle of the X-ray image and the observation angle of the projection image cannot be changed, and the determination unit determines that X-rays are not generated In addition, when the switching unit is switched to the second electrical state, only the observation angle of the projection image can be changed.

Change operation unit capable of changing the observation angle of at least one of the observation angle of the X-ray image and the observation angle of the projection image, and switching capable of switching between the first electrical state and the second electrical state An image display method of an X-ray diagnostic apparatus comprising: an X-ray imaging apparatus that generates an X-ray image data of the subject by imaging the subject, and relates to a contrasted blood vessel of the subject Projection image data in which blood vessels are emphasized is generated based on the three-dimensional image data, the generated X-ray image and the three-dimensional image are displayed, and it is determined whether or not the X-ray is generated. When the determination unit determines that X-rays are generated and the switching unit switches to the first electrical state, the observation angle of the X-ray image and the observation angle of the projection image Make both changeable and previous When the determination unit determines that X-rays are not being generated and the switching unit is switched to the first electrical state, at least the observation angle of the X-ray image can be changed, and the determination unit allows the X-rays to be changed. When the switching unit is switched to the second electrical state, both the observation angle of the X-ray image and the observation angle of the projection image cannot be changed, and the determination By the change operation unit so that only the observation angle of the projection image can be changed when it is determined that the X-ray is not generated by the unit and the switching unit is switched to the second electrical state. Controlling the operation of changing the observation angle .

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the X-ray diagnostic apparatus which enables the improvement of the procedure efficiency in a catheter procedure, and its image display method.

  Hereinafter, an X-ray diagnostic apparatus and an image display method thereof according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration of an X-ray diagnostic apparatus 1 according to the first embodiment. As shown in FIG. 1, the X-ray diagnostic apparatus 1 includes an imaging mechanism 10 and an image processing apparatus 20. As illustrated in FIG. 2, the imaging mechanism 10 includes a support portion 14 that supports the arm 12. The arm 12 has a C shape. The arm 12 carries an X-ray tube 15 and a detector 16. The X-ray tube 15 generates X-rays when a high voltage is applied from a high voltage generator (not shown). An X-ray controller 18 is connected to the high voltage generator. The X-ray control unit 18 controls the high voltage generation unit so that the X-ray tube 15 generates a dose of X-rays corresponding to fluoroscopy. The detector 16 detects X-rays generated from the X-ray tube 15 and transmitted through the subject. The detector 16 is composed of a flat panel detector (FPD) having a plurality of semiconductor detection elements arranged in a matrix. Instead of the FPD, the detector 16 may be composed of a combination of an image intensifier and a TV camera.

  The arm 12 is supported by the support unit 14 so as to be rotatable about arrows A, B, and C with respect to each of the three XYZ orthogonal axes so that the imaging angle with respect to the subject can be freely changed. Typically, the shooting angle is defined as the angle of intersection of the shooting axes with respect to the three XYZ orthogonal axes. Conventionally, it is defined as the angle of each of the first oblique position (RAO), the second oblique position (LAO), the third oblique position (LPO), and the fourth oblique position (RPO). The imaging axis is defined as a straight line passing through the center of the detection surface of the detector 16 from the X-ray focal point of the X-ray tube 15. Typically, the Z axis is defined as being approximately coincident with the body axis of the subject. Then, the Y axis and the X axis that coincide with the shooting axis intersect with the Z axis at an isocenter (shooting fixed point). A drive unit 19 is connected to the arm 12. The drive unit 19 supplies a drive signal corresponding to the control signal from the system control unit 46 to the arm 12 and moves the arm 12.

  The image processing apparatus 20 includes an A / D conversion unit 22, an interface unit 24, a three-dimensional image memory 26, a two-dimensional image memory 28, a filtering unit 30, an LUT unit 32, a misregistration calculation unit 34, a projection processing unit 36, and an image composition. Unit 38, D / A conversion unit 40, display unit 42, input device 44, and system control unit 46.

  The A / D converter 22 is connected to the detector 15. The A / D converter 22 digitizes the image signal output from the detector 15 to obtain X-ray image data. An X-ray image output in real time by X-ray fluoroscopy will be referred to as a live image.

  The interface unit 24 is connected to a LAN (Local Area Network). A modality 100 such as an X-ray computed tomography apparatus, a magnetic resonance imaging apparatus, or SPECT (Single Photon Emission Computed Tomography), a PACS (Picture Archiving and Communication Service) server 200, and the like are connected to the LAN. The interface unit 24 communicates with these devices connected to the LAN. The interface unit 24 loads three-dimensional image data from an X-ray computed tomography apparatus, a magnetic resonance imaging apparatus, a modality 100 such as SPECT, and the PACS server 200. Three-dimensional image data is handled as volume data. For example, the size (matrix size) of the three-dimensional image is 512 × 512 × 512.

  The three-dimensional image memory 26 stores various three-dimensional image data loaded by the interface unit 24. The three-dimensional image is, for example, a three-dimensional DA (digital angio) image in which blood vessels are emphasized by a contrast agent. The other three-dimensional image is a three-dimensional DSA (digital subtraction angio) image regarding the extracted blood vessel region. Still other three-dimensional images include CTA (CT angio) images and MRA (MR angio) images.

  The two-dimensional image memory 28 stores live image data generated by the imaging mechanism 10, live image data filtered by high frequency enhancement or the like, and projection image data generated by projection processing.

  The filtering unit 30 performs high frequency enhancement filtering on a live image, a projection image, and the like. An LUT (Look Up Table) unit 32 performs gradation conversion on a live image or a projected image.

  The misregistration calculation unit 34 projects a live image generated by the imaging mechanism 10 at the start of the road map and a projection image generated by performing projection processing at a projection angle corresponding to the imaging angle of the arm 12 at the start of the road map. And calculate the amount of anatomical misalignment.

  The projection processing unit 36 performs projection processing on the data of the three-dimensional image in which the blood vessel is enhanced by the contrast agent, and generates data of the projection image (blood vessel image) in which the blood vessel is enhanced. The projection processing includes not only pixel value projection processing such as maximum value projection processing, minimum value projection processing, and average value projection processing, but also volume rendering processing and surface rendering processing. Further, the projection processing unit 36 projects the data of the three-dimensional image according to the projection angle (observation angle) determined based on the imaging angle and the calculated positional deviation amount, and the positional deviation from the live image is corrected. Blood vessel image data is generated. In addition, the projection processing unit 36 generates blood vessel image data related to the observation angle according to the change operation by the input device 44 based on the three-dimensional image data.

  The image synthesis unit 38 synthesizes the live image and the blood vessel image to generate synthesized image data. The D / A conversion unit 40 is connected to the display unit 42. The D / A conversion unit 40 analogizes image data generated by performing filtering and gradation conversion on live image data, and obtains an image signal to drive the display unit 42. The display unit 42 includes a display device such as a CRT (Cathode-Ray Tube). The display unit 42 displays an image represented by the image signal output from the D / A conversion unit 40 on a display device such as a CRT.

  The input device 44 has a trigger switch that switches between two electrical states (eg, on / off). The input device 44 also has an operation switch for changing at least one of the observation angle of the X-ray image (that is, the imaging angle of the arm 12) and the observation angle of the blood vessel image (that is, the projection angle of the projection process). Have. Operation information corresponding to the operation for changing the observation angle of the X-ray image is transmitted to the drive unit 19 via the system control unit 46. Operation information corresponding to the operation for changing the observation angle of the blood vessel image is transmitted to the projection processing unit 36 via the system control unit 46. The input device 44 has a fluoroscopic button. While the fluoroscopic button is pressed, an X-ray fluoroscopic instruction signal is transmitted to the system control unit 46. A specific configuration of the input device 44 will be described later.

  The system control unit 46 performs control according to the signal based on various signals from the input device 44. Specifically, the system control unit 46 controls each unit to perform X-ray fluoroscopy while receiving an X-ray fluoroscopic instruction signal. While the X-ray fluoroscopic instruction signal is not received, the system control unit 46 controls each unit to stop the X-ray fluoroscopy. Further, the system control unit 46 has a function of managing a mode of change operation performed through the input device 44. In the management function of the change operation mode, the system control unit 46 switches the change operation mode based on the determination of whether or not X-ray fluoroscopy is being performed and the state of the trigger switch.

  Hereinafter, the management processing of the observation angle changing operation mode performed under the control of the system control unit 46 will be specifically described. FIG. 3 is a perspective view of the console CS included in the input device 44. As shown in FIG. 3, the console CS has a trigger key TK. When the trigger key TK is pulled by the user, a trigger switch (not shown) provided inside the console CS outputs a signal (hereinafter referred to as trigger signal) indicating that the trigger key TK is being pulled. The trigger switch continues to output the trigger signal as long as the trigger key TK is continuously pulled, and does not output the trigger signal unless the trigger key TK is pulled.

  Further, as shown in FIG. 3, the operation console CS is provided with an operation key CK so as to be tiltable in the entire circumferential direction. When the user operates the operation key CK, an operation switch (not shown) provided in the console CS is an operation signal corresponding to the operation of the operation key CK (a signal that distinguishes the tilt direction of the operation key). Is output.

  In addition, as shown in FIG. 3, the console CS is provided with a plurality of buttons. When a button is pressed by the user, a button switch corresponding to the pressed button provided in the console CS outputs a signal indicating that the corresponding button has been pressed (hereinafter referred to as a button signal). To do. For example, the console CS has a fluoroscopic button, and when the fluoroscopic button is pressed, the fluoroscopic button switch outputs a button signal corresponding to the fluoroscopic button. The fluoroscopic button switch resets a button signal corresponding to the fluoroscopic button when the fluoroscopic button is released. The console CS has a three-dimensional road map button. When the three-dimensional road map button is pressed, the three-dimensional road map button switch outputs a button signal corresponding to the three-dimensional road map button.

  As shown in FIG. 3, the console CS is provided with a grip portion GR for gripping by the user. A trigger key TK and an operation key CK are attached in the vicinity of the grip portion GR. For example, when holding the grip portion GR with the left hand, the user can pull the trigger key TK with the left index finger, and can operate the operation key CK with the left thumb.

  FIG. 4 is a diagram illustrating a determination table for the observation angle changing operation mode. As shown in FIG. 4, the change operation mode is determined by the system control unit 46 based on the state of the trigger switch and the determination whether or not X-ray fluoroscopy is being performed. There are four types of change operation modes, for example. The four types of change operation modes will be described below.

  As shown in FIG. 4, during a period in which a trigger signal is output (trigger key is pulled), and during X-ray generation (X-ray fluoroscopy), the system control unit 46 monitors the X-ray image observation angle ( The first mode in which both the imaging angle of the arm 12) and the observation angle of the blood vessel image (projection angle of the projection process) can be changed is set. That is, during X-ray generation, a double action operation with a trigger key and an operation key is performed, whereby the imaging angle of the arm 12 and the observation angle of the blood vessel image are changed. That is, the observation angle of the composite image of the live image and the blood vessel image is changed.

  As shown in FIG. 4, the period during which the trigger signal is output, and the X-ray is stopped (X-ray fluoroscopy is stopped), the system control unit 46 determines the X-ray image observation angle (the imaging angle of the arm 120). The second mode in which both the observation angle of the blood vessel image (projection angle of the projection process) can be changed is set. That is, when the X-ray is stopped, the imaging action of the arm 12 and the observation angle of the blood vessel image are changed by performing a double action operation with the trigger key and the operation key. At this time, the live image fades out on the screen displaying the composite image, and the blood vessel image rotates according to the change in the observation angle.

  As shown in FIG. 4, during the period when the trigger signal is not output (the trigger key is not pulled), and during X-ray generation (X-ray fluoroscopy), the observation angle of the X-ray image and the observation angle of the blood vessel image Both are set to the fourth mode which cannot be changed. That is, even when a single action operation using only the operation keys is performed during X-ray generation, the observation angle of the composite image of the live image and the blood vessel image is not changed.

  As shown in FIG. 4, the system control unit 46 is set to the third mode in which only the observation angle of the blood vessel image can be changed while the trigger signal is not output and the X-ray is stopped (during fluoroscopy). To do. That is, only the observation angle of the blood vessel image is changed by performing a single action operation using only the operation keys while the X-ray is stopped. At this time, the live image that has been synthesized and displayed fades out.

  With such a configuration, a work that should be performed carefully, such as an operation for changing the imaging angle of the arm 12, is a double action operation, and an operation that does not need to be performed relatively carefully, such as an operation for changing the observation angle of a blood vessel image. This can be done with a single action.

  FIG. 5 is a diagram for explaining the flow of the management process for the change operation mode according to the first embodiment, which is performed under the catheterization situation. Hereinafter, for the sake of specific explanation, it is assumed that the projection processing is volume rendering processing.

  As shown in FIG. 5, when the three-dimensional road map button is pressed by the user, the system control unit 46 displays a screen for selecting an image to be superimposed on the live image on the display unit 42. The user selects an image to be superimposed on the screen via the input device 44. The images to be superimposed include a three-dimensional DSA image, a three-dimensional DA image, a CTA image, and an MRA image. In the following, it is assumed that a three-dimensional DSA image is selected for the sake of simplicity.

  When an image to be superimposed is selected, the system control unit 46 generates live image data relating to an observation angle corresponding to the imaging angle of the arm 12. Further, the positional deviation amount between the live image and the blood vessel image generated at the time when the image is selected is calculated by the positional deviation calculation unit 34. Then, the projection processing unit 36 determines the projection angle based on the calculated positional deviation amount and the shooting angle of the arm 12, performs volume rendering processing on the three-dimensional DSA image at the determined projection angle, and corrects the positional deviation from the live image. Generated blood vessel image data. When the fluoroscopic button is pressed, the generated blood vessel image and the live image are combined by the image combining unit 38. The LUT unit 32 assigns a unique color to the blood vessel image portion of the composite image. The display unit 42 displays this composite image.

  When the image to be superimposed is selected, the system control unit 46 waits for the operation key to be operated, that is, to detect the operation signal (step SA1).

  When the operation key is operated by the user, the system control unit 46 determines whether the trigger key is pulled, that is, whether a trigger signal is detected (step SA2).

  If it is determined that the trigger key is being pulled (step SA2: YES), the system control unit 46 determines whether or not X-ray fluoroscopy is being performed (step SA3). Whether or not X-ray fluoroscopy is being performed is determined based on, for example, whether or not the fluoroscopy button is pressed.

  When it is determined that X-ray fluoroscopy is being performed (step SA3: YES), the system control unit 46 changes the change operation mode to the first mode. In the first mode, the system control unit 46 moves the arm 12 to the drive unit 19 according to the operation amount of the operation key (step SA4). At the same time, the system control unit 46 transmits the projection angle change information corresponding to the operation amount of the operation key to the projection processing unit 36. The projection processing unit 36 that has received the change information of the projection angle determines the projection angle based on the change information and the imaging angle of the arm 12 (step SA5). Next, the projection processing unit 36 performs volume rendering processing on the three-dimensional DSA image at the determined projection angle, and generates blood vessel image data in which the positional deviation from the live image is corrected (step SA6). The system control unit 46 causes the image synthesis unit 38 to synthesize the position-corrected blood vessel image and the live image to generate synthesized image data (step SA7). Then, the system control unit 46 displays the generated composite image on the display unit 42 (step SA8).

  When it is determined in step SA3 that X-ray fluoroscopy is not performed, that is, X-ray generation is stopped (step SA3: NO), the system control unit 46 changes the change operation mode to the second mode. In the second mode, the system control unit 46 moves the arm 12 to the drive unit 19 according to the operation amount of the operation key (step SA9). At the same time, the system control unit 46 transmits the projection angle change information corresponding to the operation amount of the operation key to the projection processing unit 36. Receiving the projection angle change information, the projection processing unit 36 determines the projection angle based on the change information and the imaging angle of the arm 12 (step SA10). Next, the projection processing unit 36 performs volume rendering processing on the three-dimensional DSA image at the determined projection angle, and generates blood vessel image data corresponding to the observation angle corresponding to the change operation (step SA11). Then, the system control unit 46 displays the generated blood vessel image on the display unit 42 (step S12). The final image of the live image is displayed, for example, in a display area different from the display area of the composite image or in another display unit. When the fluoroscopy is performed after step SA12 and a live image is collected, a composite image of the live image and the blood vessel image is displayed on the display unit 42 again.

  When it is determined in step SA2 that the trigger key has not been pulled (step SA2: NO), the system control unit 46 determines whether or not X-ray fluoroscopy is being performed (step SA13). If it is determined that X-ray fluoroscopy is being performed (step SA13: YES), the system control unit 46 changes the change operation mode to the fourth mode. In the fourth mode, the system control unit 46 does not change the observation angle of the X-ray image (imaging angle of the arm 12) nor the observation angle of the blood vessel image (projection angle of the projection process) even if the operation key is operated.

  If it is determined in step SA13 that X-ray fluoroscopy is not being performed (step SA13: NO), the system control unit 49 changes the change operation mode to the third mode. In the third mode, the system control unit 46 transmits the change information of the projection angle corresponding to the operation amount of the operation key to the projection processing unit 36, and causes the projection processing unit 36 to determine the projection angle based on the change information (step). SA14). Then, the projection processing unit 36 performs volume rendering processing on the three-dimensional DSA image according to the determined projection angle, and generates blood vessel image data (step SA15). Then, the system control unit 38 displays the generated blood vessel image on the display unit 42 (step SA16). For example, the blood vessel image is displayed in a display area different from the display area of the composite image. Alternatively, the blood vessel image may be displayed on a display unit different from the display unit on which the composite image is displayed. In response to the X-ray fluoroscopy performed after step SA14, the projection processing unit 36 sets the observation angle to the observation angle before the change.

  In the above processing, the blood vessel image and the live image are combined and displayed, but the blood vessel image and the live image may be displayed side by side.

  In the above processing, it is assumed that a three-dimensional DSA image is selected for the sake of simplicity. However, the first embodiment is not limited to this. When a non-three-dimensional DSA image is selected, for example, a blood vessel region may be extracted from the three-dimensional image data by threshold processing or the like before the start of fluoroscopy. The processing after the extraction can be performed in the same manner as the above method by converting the extracted three-dimensional image relating to the blood vessel region into a three-dimensional DSA image.

  With the above configuration, the system control unit 46 performs an operation of changing the observation angle of the X-ray image and the observation angle of the blood vessel image based on the determination as to whether X-rays are generated and the result of the trigger switch switching. Control possible states. By this control, the system control unit 46 can selectively rotate at least one of the X-ray image and the blood vessel image while the X-ray is stopped. Therefore, the user can grasp the three-dimensional traveling direction of the blood vessel while reducing the exposure amount of the subject. Thus, according to the first embodiment, it is possible to provide an X-ray diagnostic apparatus and an image display method thereof that can improve the procedure efficiency in the catheter procedure.

(Second Embodiment)
The state of the switch according to the first embodiment is assumed to be on and off of the trigger signal by the trigger switch. The state of the switch according to the second embodiment may be, for example, an A state and a B state by a changeover switch, for example. Hereinafter, the X-ray diagnostic apparatus 1 according to the second embodiment will be described. In the following description, components having substantially the same functions as those in the first embodiment are denoted by the same reference numerals, and redundant description will be given only when necessary.

  The input device 44 according to the second embodiment has a switching button KB for switching between the A state and the B state. When the switching button KB is pressed by the user, a switching button switch provided in the console is a signal indicating that switching from the B state to the A state (hereinafter referred to as A signal) or A A signal indicating that the state has been switched to the B state (hereinafter referred to as the B signal) is output. The system control unit 46 recognizes that the changeover switch is in the A state when receiving the A signal, and recognizes that the changeover switch is in the B state when receiving the B signal. In order to make it possible to visually recognize whether the state is the A state or the B state, the console may be provided with a lamp AL that glows when in the A state and a lamp BL that glows when in the B state.

  As shown in FIG. 4, the system control unit 46 is a period during which the switching button switch is in the A state, and during X-ray generation (X-ray fluoroscopy), an X-ray image observation angle (imaging angle of the arm 12). And the blood vessel image observation angle (projection angle of the projection process) are set to the first mode in which both can be changed. During the period of A state and when X-ray is stopped (X-ray fluoroscopy is stopped), the system control unit 46 is set to the second mode in which both the X-ray image observation angle and the blood vessel image observation angle can be changed. To do. During the period of B state and during X-ray generation (X-ray fluoroscopy), the system control unit 46 sets the fourth mode in which neither the imaging angle of the arm 12 nor the observation angle of the blood vessel image can be changed. . During the period in the B state and during X-ray stop (during X-ray fluoroscopy), the system control unit 46 sets the third mode in which only the observation angle of the blood vessel image can be changed.

  During X-ray fluoroscopy, the state of the switching button switch automatically shifts to the A state. During X-ray fluoroscopy, the system control unit 46 locks the switching button KB so that switching from the A state to the B state is impossible. Further, the system control unit 46 automatically switches to the A state when the switching button switch is in the B state at the start of fluoroscopy.

  FIG. 7 is a diagram for explaining the flow of the management process for the change operation mode according to the second embodiment, which is performed under the situation of catheterization. As shown in FIG. 1, the system control unit 46 waits for the operation key to be operated, that is, to detect the operation signal (step SB1).

  When the operation key is operated by the user, the system control unit 46 determines whether or not the button switch is in the A state (step SB2).

  When it is determined that the state is the A state (step SB2: YES), the system control unit 46 determines whether or not X-ray fluoroscopy is being performed (step SB3).

  When it is determined that X-ray fluoroscopy is being performed (step SB3: YES), the system control unit 46 changes the change operation mode to the first mode. In the first mode, the system control unit 46 causes the drive unit 19 to move the arm 12 according to the operation amount of the operation key (step SB4). At the same time, the system control unit 46 transmits the projection angle change information corresponding to the operation amount of the operation key to the projection processing unit 36. The projection processing unit 36 that has received the change information of the projection angle determines the projection angle based on the change information and the imaging angle of the arm 12 (step SB5). Next, the projection processing unit 36 performs volume rendering processing on the three-dimensional DSA image at the determined projection angle, and generates blood vessel image data in which the positional deviation from the live image is corrected (step SB6). The system control unit 46 causes the image synthesis unit 38 to synthesize the position-corrected blood vessel image and the live image to generate synthesized image data (step SB7). And the system control unit 46. The generated composite image is displayed on the display unit 42 (step SB8).

  When it is determined in step SB3 that X-ray fluoroscopy is not being performed (step SB3: NO), the system control unit 46 changes the change operation mode to the second mode. In the second mode, the system control unit 46 moves the arm 12 to the drive unit 19 according to the operation amount of the operation key (step SB9). At the same time, the system control unit 46 transmits the projection angle change information corresponding to the operation amount of the operation key to the projection processing unit 36. The projection processing unit 36 that has received the change information of the projection angle determines the projection angle based on the change information and the imaging angle of the arm 12 (step SB10). Next, the projection processing unit 36 performs volume rendering processing on the three-dimensional DSA image at the determined projection angle, and generates blood vessel image data corresponding to the observation angle corresponding to the change operation (step SB11). Then, the system control unit 46 displays the generated blood vessel image on the display unit 42 (step SB12). The final image of the live image is displayed in, for example, a region different from the composite image display region or a display unit. When fluoroscopy is performed after step SB12 and a live image is acquired, a composite image of the live image and the blood vessel image is displayed on the display unit 42 again.

  When it is determined in step SB2 that the button switch is not in the A state, that is, in the B state (step SB2: NO), the system control unit 46 determines whether or not X-ray fluoroscopy is being performed (step SB13). When it is determined that X-ray fluoroscopy is being performed (step SB13: YES), the system control unit 46 changes the change operation mode to the fourth mode. In the fourth mode, the system control unit 46 switches the button switch from the B state to the A state (step SB14).

  If it is determined in step SB13 that X-ray fluoroscopy is not being performed (step SB13: NO), the system control unit 46 changes the change operation mode to the third mode. In the third mode, the system control unit 46 transmits the projection angle change information corresponding to the operation amount of the operation key to the projection processing unit 36, and the projection processing unit 36 is based on the change information and the imaging angle of the arm 12. The projection angle is determined (step SB15). Then, the projection processing unit 36 performs volume rendering processing on the three-dimensional DSA image according to the determined projection angle, and generates blood vessel image data (step SB16). Then, the system control unit 38 displays the generated blood vessel image on the display unit 42 (step SB17).

  Thus, according to the second embodiment, it is possible to provide an X-ray diagnostic apparatus and an image display method thereof that can improve the procedure efficiency in the catheter procedure.

  Note that the observation angle changing operation modes according to the first and second embodiments are not limited to those shown in FIG. For example, in the second mode in the first and second embodiments, both the X-ray image observation angle (imaging angle of the arm 12) and the blood vessel image observation angle (projection angle of the projection process) are set to be changeable. It was supposed to be. However, in the second mode, the observation angle of the X-ray image (the imaging angle of the arm 12) may be set to be changeable, and the observation angle of the blood vessel image may be set to be unchangeable.

(Modification)
The console of the input device 44 according to the modification includes a rotation button. When the rotation button is pressed by the user, a rotation button switch provided inside the console outputs a signal indicating that the rotation button has been pressed (hereinafter referred to as a rotation signal). When it is determined that the X-ray is not generated, the system control unit 46 unlocks the rotation button to enable the operation, and when the X-ray is generated, the system control unit 46 locks the rotation button to disable the operation. To do. The display unit 42 rotates the blood vessel image on the screen according to a predetermined rotation trajectory when the rotation button provided in the input device is pressed while the X-ray is stopped. When X-rays are generated, the display unit 42 displays the blood vessel image before rotation.

  Hereinafter, the operation of the X-ray diagnostic apparatus according to the modification will be described.

  The user sets a region of interest including a blood vessel region of interest on the blood vessel image displayed on the display unit 42 via the input device 44. The rotation axis determination unit (not shown) thins the blood vessel region included in the selected region of interest. The rotation axis determination unit performs tracking processing on the fine line and calculates a plurality of unit vectors along the fine line. The rotation axis determination unit calculates the rotation axis of the blood vessel region based on the calculated plurality of unit vectors. When the rotation axis is calculated, the user rotates the blood vessel image around the calculated rotation axis on the screen via the input device 44, and registers an observation angle at which the blood vessel region is most easily observed. The registered observation angle information is transmitted to the projection processing unit 36.

  During X-ray fluoroscopy, the projection processing unit 36 generates blood vessel image data related to the registered observation angle, triggered by receiving a rotation signal. A blood vessel image related to the registered observation angle is displayed on the display unit 42.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

The figure which shows the structure of the X-ray diagnostic apparatus which concerns on 1st Embodiment of this invention. The perspective view of the imaging mechanism of FIG. The perspective view of the console which the input device of FIG. 1 has. The figure which shows the determination table of the change operation mode managed by the system control part of FIG. The figure which shows the flow of the management process of the change operation mode by the system control part of FIG. The perspective view of the input device which concerns on 2nd Embodiment of this invention. The figure which shows the flow of the management process of the change operation mode in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... X-ray diagnostic apparatus, 10 ... Imaging mechanism, 12 ... Arm, 15 ... X-ray tube, 16 ... Detector, 18 ... X-ray control part, 19 ... Drive part, 20 ... Image processing part, 22 ... A / D Conversion unit, 24 ... interface unit, 26 ... 3D image memory, 28 ... 2D image memory, 30 ... filtering unit, 32 ... LUT unit, 34 ... misregistration calculation unit, 36 ... projection processing unit, 38 ... image synthesis unit , 40 ... D / A conversion unit, 42 ... display unit, 44 ... input device, 46 ... system control unit

Claims (9)

An imaging unit for imaging a subject with X-rays and generating X-ray image data;
A projection processing unit that performs projection processing of data of a three-dimensional image related to a blood vessel in which the subject is contrasted, and generates data of a projection image in which the blood vessel is emphasized;
A change operation unit capable of changing the observation angle of at least one of the observation angle of the generated X-ray image and the observation angle of the projection image;
A determination unit for determining whether or not the X-ray is generated;
A switching unit capable of switching between a first electrical state and a second electrical state ;
A control unit for controlling an observation angle change operation by the change operation unit based on a result of determination by the determination unit and switching by the switching unit;
An X-ray diagnostic apparatus comprising :
When it is determined by the determination unit that X-rays are being generated and the switching unit is switched to the first electrical state, both the observation angle of the X-ray image and the observation angle of the projection image are determined. When it is determined that the X-ray is not generated by the determination unit and is switched to the first electrical state by the switching unit, at least the observation angle of the X-ray image can be changed, When the determination unit determines that X-rays are generated and the switching unit is switched to the second electrical state, both the observation angle of the X-ray image and the observation angle of the projection image are changed. When the determination unit determines that X-rays are not generated and the switching unit switches to the second electrical state, only the observation angle of the projection image To enable change,
X-ray diagnostic apparatus characterized by the above . The projection processing unit, when the viewing angle of the X-ray image is changed when it is and is switched to the first electrical state when the X-rays is determined not to be generated, the X changing the viewing angle of the projected image according to change in viewing angle of the line image, X-rays diagnostic apparatus according to claim 1. The switching unit includes a first key, selects the first electrical state while the first key is pressed, and the first key while the first key is not pressed. selecting an electrical state of 2, X-ray diagnostic apparatus according to claim 1. The switching unit includes a second key, said the second key from the first electrical state as a trigger that is pressed in the second electrical state or the second electrical switching from state to the first electrical state, X-rays diagnostic apparatus according to claim 1. The switching unit, when the X-ray is determined to have been generated, switching from the second electrical state to said first electrical state, X-ray diagnostic apparatus according to claim 4, wherein. In the state in which the X-ray is not generated by the determination unit , the control unit is configured to generate the X-ray by the determination unit after the observation angle of the projection angle is changed by the change operation unit. If it is determined that the viewing angle of the projected image back to the observation angle before the change from the observation angle after the change, X-rays diagnostic apparatus according to claim 1. The imaging unit has an arm on which an X-ray tube and a detector are mounted,
A drive unit that moves the arm to a shooting angle corresponding to an observation angle of the projection image after the change operation;
The X-ray diagnostic apparatus according to claim 1.   The projection processing unit projects the data of the three-dimensional image at a projection angle corresponding to the observation angle of the projection image after the change operation, and generates projection image data related to the observation angle after the change operation. The X-ray diagnostic apparatus according to Item 1. Change operation unit capable of changing the observation angle of at least one of the observation angle of the X-ray image and the observation angle of the projection image, and switching capable of switching between the first electrical state and the second electrical state An image display method of an X-ray diagnostic apparatus comprising:
X-ray imaging of the subject by the imaging unit to generate X-ray image data relating to the subject,
Generating projection image data in which blood vessels are emphasized based on three-dimensional image data relating to the contrasted blood vessels of the subject;
Displaying the generated X-ray image and three-dimensional image;
It is determined whether or not the X-ray is generated,
When it is determined by the determination unit that X-rays are being generated and the switching unit is switched to the first electrical state, both the observation angle of the X-ray image and the observation angle of the projection image are determined. When it is determined that the X-ray is not generated by the determination unit and is switched to the first electrical state by the switching unit, at least the observation angle of the X-ray image can be changed, When the determination unit determines that X-rays are generated and the switching unit is switched to the second electrical state, both the observation angle of the X-ray image and the observation angle of the projection image are changed. When the determination unit determines that X-rays are not generated and the switching unit switches to the second electrical state, only the observation angle of the projection image As can be changed to control the viewing angle changing operation by the changing operation portion,
An image display method for an X-ray diagnostic apparatus.

Images