JP2012205814A - Apparatus and method for displaying stereoscopic image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve appropriate stereoscopic view according to an object, using a stereoscopic image display apparatus.SOLUTION: In the stereoscopic image display apparatus provided with a display unit that displays a stereoscopic image using a plurality of radiographic images obtained by imaging the object by radiography from at least two imaging directions, the plurality of radiographic images are reduced in size with an initial reduction ratio determined from the angle formed by the two imaging directions and the thickness of the object, and the stereoscopic image generated by using the plurality of reduced radiographic images is displayed on the display unit. Further, the plurality of reduced radiographic images are enlarged at a predetermined magnification, and the stereoscopic image generated by using the plurality of expanded radiographic images is displayed on the display unit.

Description

  The present invention relates to a stereoscopic image display device that detects a radiographic image for each imaging direction by irradiating a subject with radiation from two different imaging directions, and displays a stereoscopic image using the two detected radiographic images. The present invention relates to a stereoscopic image display method.

  Conventionally, it is known that stereoscopic viewing can be performed using parallax by displaying a plurality of images in combination. Such a stereoscopically viewable image (hereinafter referred to as a stereoscopic image or a stereo image) is generated based on a plurality of images with parallax obtained by photographing the same subject from different directions. Such stereoscopic image generation is used not only in the fields of digital cameras and televisions but also in the field of radiographic imaging. That is, the patient is irradiated with radiation from different directions, the radiation transmitted through the subject is detected by a radiation image detector, and a plurality of radiation images having parallax are obtained, and these radiations are acquired. A stereoscopic image is generated based on the image. By generating a stereoscopic image in this way, the observer can observe a radiological image with a sense of depth, which is more suitable for diagnosis. A radiographic image can be observed.

  On the other hand, when the viewer stereoscopically views a stereoscopic image, for example, in a plurality of radiological images with parallax, for example, a portion with high luminance that the observer may feel most impressive, a portion with a high density of this portion, etc. An image with a three-dimensional effect is recognized by superimposing arbitrary attention sites that exist in common in a plurality of radiographic images, that is, by fusing.

JP 2003-348622 A

  However, as shown in FIG. 8, the difference between the convergence angle β when viewing one point on the display and the convergence angle α when viewing the target region with both eyes determined by the binocular parallax is the disparity angle | α−. Assuming β |, when the convergence angle β is a constant value, the value of the convergence angle α increases and the value of the parallax angle | α−β | increases as the attention site is closer to the front side. For this reason, in the stereoscopic image, the parallax generated between the eyes of the observer is used. Therefore, when the parallax angle | α−β | is too large, stereoscopic viewing is difficult and the viewer is uncomfortable or tired. There is a risk that.

  In addition, when the subject is thick in the depth direction, the convergence angle α increases when the region of interest is located on the near side of the subject, and the parallax angle | α−β | When the angle | α−β | becomes large, it becomes difficult to fuse. In general, the parallax angle | α−β | = 2 degrees or less is considered to be a range in which comfortable stereoscopic viewing can be performed.

  Further, in a stereoscopic display device such as a stereo biopsy device, in order to obtain the three-dimensional coordinate position of the position indicated by the target with high accuracy, in the radiation detector, the overlapping area of the portions irradiated with radiation is increased. In addition, in order to specify a target using a radiographic image acquired by irradiating radiation from an imaging direction of ± 15 ° (convergence angle α = 30 °), a stereo image generated using the radiographic image is stereoscopically viewed. When doing this, it is necessary to properly adjust the eye (crossing eyes) at the target site. However, since the stereo image has a long distance in the depth direction, it is difficult to focus on the target position, that is, to fuse the stereo image. .

  In Patent Document 1, by gradually changing the amount of parallax from a predetermined initial value to a final value as time passes, an observer who is not familiar with stereoscopic images suddenly sees a video with a large amount of parallax. Although a stereoscopic image display method for preventing the eyes and brain from feeling excessive fatigue is disclosed, the method described in Patent Literature 1 is configured to preliminarily determine the initial value of the parallax amount regardless of the content of the stereoscopic image. Since the final value is determined, the case where the displayed stereoscopic image is different is not taken into consideration. Further, although the final value of the parallax amount is determined in advance, it is not known whether or not the observer can stereoscopically view when the final value is reached. In addition, as a method of changing the amount of parallax, only reading out an image having a predetermined amount of parallax from video having various amounts of parallax or drawing using CG (computer graphics) is described. Enlarging or reducing the image is not described.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stereoscopic image display device and a stereoscopic image display method that enable appropriate stereoscopic viewing according to a subject.

The stereoscopic image display apparatus of the present invention includes a display unit that displays a stereoscopic image that can be stereoscopically viewed using a plurality of radiographic images acquired by radiographing a subject from at least two imaging directions;
A reduction rate determination unit for determining an initial reduction rate of the plurality of radiation images from an angle formed by the two imaging directions and a thickness of the subject;
The plurality of radiation images are reduced at the initial reduction rate determined by the reduction rate determination unit, and a stereoscopic image generated using the reduced plurality of radiation images is displayed on the display unit, and the reduction is performed. An image size changing unit for enlarging a plurality of radiographic images at a predetermined enlargement ratio and displaying a stereoscopic image generated using the enlarged radiographic images on the display unit; To do.

  Here, the “stereoscopic image” means an image that allows the observer to recognize the stereoscopic effect of the subject.

  In the stereoscopic image display device of the present invention, the display unit may include a cursor display control unit that displays a scaled cursor together with the stereoscopic image.

  In the stereoscopic image display apparatus of the present invention, the image size changing unit may gradually enlarge the reduced plurality of radiation images.

  In the stereoscopic image display device of the present invention, the image size changing unit may enlarge the reduced plurality of radiation images in a stepwise manner.

  In the stereoscopic image display device of the present invention, the image size changing unit may enlarge the reduced plurality of radiation images steplessly.

The stereoscopic image display method of the present invention includes a display unit that displays a stereoscopic image that can be stereoscopically viewed using a plurality of radiation images acquired by radiographing a subject from at least two imaging directions. A stereoscopic image display method using a stereoscopic image display device,
Reducing the plurality of radiographic images at an initial reduction ratio determined from an angle formed by the two imaging directions and the thickness of the subject;
Displaying a stereoscopic image generated using the reduced plurality of radiation images on the display unit;
Enlarging the reduced plurality of radiographic images at a predetermined magnification,
A stereoscopic image generated using the enlarged plurality of radiation images is displayed on the display unit.

  In the stereoscopic image display method of the present invention, it is preferable that a scaled cursor is displayed on the display unit together with the stereoscopic image.

  In the stereoscopic image display method of the present invention, the reduced plurality of radiation images may be gradually enlarged.

  In the stereoscopic image display method of the present invention, the plurality of reduced radiographic images may be enlarged stepwise.

  In the stereoscopic image display method of the present invention, the plurality of reduced radiation images may be enlarged steplessly.

  According to the stereoscopic image display apparatus and the stereoscopic image display method of the present invention, a stereoscopic image that can be stereoscopically viewed using a plurality of radiographic images acquired by radiographing a subject from at least two imaging directions. In a stereoscopic image display device including a display unit for displaying, a plurality of radiation images are reduced at an initial reduction ratio determined from an angle formed by two imaging directions and a thickness of a subject, and the plurality of reduced images are reduced. A stereoscopic image generated using the radiographic image is displayed on the display unit, the reduced plurality of radiographic images are enlarged at a predetermined magnification, and the stereoscopic image generated using the enlarged plurality of radiographic images is displayed. Since it is displayed on the display unit, a plurality of radiographic images can be reduced to an appropriate size according to the thickness of the object to be imaged and the angle (convergence angle α) formed by the two imaging directions. Shrinkage Since the amount of shift of the target region of the subject, that is, the amount of parallax, is smaller in the plurality of radiographic images than before the reduction, the value of the convergence angle α in FIG. 8 is also small when displayed as a stereoscopic image. As a result, the parallax angle | α−β | becomes smaller when the viewing conditions are the same as those of the stereoscopic image before the reduction, so that the observer can easily view the attention site in 3D, and the viewer's discomfort and fatigue. Can be reduced.

  Furthermore, by magnifying and displaying a plurality of reduced radiographic images, the observer can fuse the reduced stereoscopic images and view the enlarged stereoscopic images while maintaining the fusion. Therefore, it is possible to reduce the state where it is difficult to fuse.

  In general, once a stereoscopic image that has been successfully fused is to be stereoscopically viewed again, the viewer can easily stereoscopically view the enlarged stereoscopic image in a short time, regardless of the size. it can.

Schematic configuration diagram of stereo biopsy device The figure which shows a part of front view of the stereo biopsy apparatus of FIG. View of compression plate from above 1 is a diagram showing the internal configuration of the computer of the stereo biopsy device of FIG. The flowchart which shows the effect | action of the stereo biopsy apparatus of FIG. Diagram explaining reduction of stereo image Diagram explaining enlargement of stereo image Diagram explaining stereoscopic vision

  Hereinafter, a stereo biopsy device for breasts, which is a breast image photographing display device (mammography device) to which a detachable biopsy unit 2 is attached, will be described as an embodiment of a stereoscopic image display device of the present invention with reference to the drawings. . First, a schematic configuration of the stereo biopsy device 1 of the present embodiment will be described. FIG. 1 is a schematic configuration diagram of a stereo biopsy device 1, and FIG. 2 shows a part of a front view of the stereo biopsy device 1.

  As shown in FIG. 1, the stereo biopsy device 1 includes a mammography device 10 with the biopsy unit 2 attached thereto, a computer 8 connected to the mammography device 10, and a monitor 9 connected to the computer 8. And an input unit 7.

  As shown in FIG. 1, the mammography apparatus 10 includes a base 11, a rotary shaft 12 that can move in the vertical direction (Z direction) with respect to the base 11, and can be rotated. The arm part 13 connected with the base 11 is provided.

  The arm portion 13 has an alphabet C shape, and a radiation table 16 is attached to one end of the arm portion 13 so as to face the imaging table 14 at the other end. The rotation and vertical movement of the arm unit 13 are controlled by an arm controller 31 incorporated in the base 11.

  A radiation detector 15 such as a flat panel detector and a detector controller 33 that controls reading of a charge signal from the radiation detector 15 are provided inside the imaging table 14. The imaging table 14 includes a charge amplifier that converts a charge signal read from the radiation detector 15 into a voltage signal, a correlated double sampling circuit that samples a voltage signal output from the charge amplifier, a voltage A circuit board provided with an AD conversion unit for converting a signal into a digital signal is also installed.

  In addition, the imaging table 14 is configured to be rotatable with respect to the arm unit 13, and even when the arm unit 13 rotates with respect to the base 11, the direction of the imaging table 14 is fixed to the base 11. can do.

  The radiation detector 15 can repeatedly perform recording and reading of a radiation image, and may use a so-called direct type radiation image detector that directly receives radiation and generates a charge, A so-called indirect radiation image detector that converts radiation once into visible light and converts the visible light into a charge signal may be used.

  As a radiation image signal readout method, a radiation image signal is read out by turning on / off a TFT (thin film transistor) switch, or a radiation image is emitted by irradiating reading light. It is desirable to use a so-called optical readout system in which a signal is read out, but the present invention is not limited to this, and other systems may be used.

  A radiation source 17 and a radiation source controller 32 are housed in the radiation irradiation unit 16. The radiation source controller 32 irradiates the radiation from the radiation source 17 and the radiation generation conditions (tube current (mA), irradiation time (ms), tube current time product (mAs), tube voltage (kV) in the radiation source 17. Etc.).

  Further, in the central portion of the arm portion 13, a compression plate 18 that is disposed above the imaging table 14 and presses and compresses the breast M, a support portion 20 that supports the compression plate 18, and a support portion 20 that extends in the vertical direction. A moving mechanism 19 for moving in the (Z direction) is provided. The position of the compression plate 18 and the compression pressure are controlled by the compression plate controller 34. FIG. 3 is a view of the compression plate 18 as viewed from above. As shown in FIG. 3, the compression plate 18 is about 10 so that biopsy can be performed with the breast fixed by the imaging table 14 and the compression plate 18. An opening 5 having a size of 10 cm square is provided.

  The biopsy unit 2 is mechanically and electrically connected to the stereo biopsy device 1 by inserting the base portion of the biopsy unit 2 into the opening 5 of the support portion 20 of the compression plate 18 and attaching the lower end of the base portion to the arm portion 13. It is what is done.

  The biopsy unit 2 includes a biopsy needle 21 that punctures the breast. The biopsy needle unit 22 is configured to be detachable, a needle support portion 23 that supports the biopsy needle unit 22, and the needle support portion 23 along the rail. A moving mechanism 24 that moves the biopsy needle unit 22 in the X, Y, and Z directions shown in FIGS. 1 to 3 by moving the needle support portion 23 in or out is provided.

  The position of the tip of the biopsy needle 21 of the biopsy needle unit 22 is recognized and controlled as a three-dimensional coordinate position (x, y, z) by a needle position controller 35 provided in the moving mechanism 24. 1 is the X direction, the paper vertical direction in FIG. 2 is the Y direction, and the paper vertical direction in FIG. 3 is the Z direction.

  The input unit 7 accepts input of imaging conditions and observation conditions by the observer, input of operation instructions, and the like, and is configured by an input device such as a keyboard and a mouse, for example. In the present embodiment, a function for designating and inputting a predetermined target such as an abnormal shadow, calcification, or lesion in a radiographic image for a left eye and a radiographic image for a right eye read from a radiographic image storage unit 8b described later is provided. .

  The computer 8 includes a central processing unit (CPU), a semiconductor memory, a storage device such as a hard disk and an SSD, and the like. With these hardware, a control unit 8a, a radiation image storage unit 8b, and a display as shown in FIG. A control unit 8c, an image size change unit 8d, a reduction rate determination unit 8e, and a position acquisition unit 8f are configured.

  The controller 8a outputs predetermined control signals to the various controllers 31 to 35 to control the entire system. A specific control method will be described in detail later.

  The radiation image storage unit 8b stores in advance a radiation image signal for each imaging direction acquired by the radiation detector 15.

  The display control unit 8c performs predetermined processing on the two radiographic image signals of the left-eye radiographic image and the right-eye radiographic image read from the radiographic image storage unit 8b, and then performs stereo processing of the breast M on the monitor 9. An image is displayed.

  It also functions as a cursor display control unit that displays a scaled cursor (hereinafter referred to as a scale cursor C) on a left-eye radiographic image and a right-eye radiographic image constituting a stereo image displayed on the monitor 9 described later. The scale cursor C is displayed on the monitor 9 by changing the relative left and right shift amounts of the scale cursor C respectively displayed in the left-eye radiographic image and the right-eye radiographic image in accordance with an input from the input unit 7 described later. It is moved in the depth direction (Z direction) on the stereo image. Further, the scale cursor C is displayed on the stereo image displayed on the monitor 9 by changing the display position of the scale cursor C in the horizontal direction (X direction) and the vertical direction (Y direction) while maintaining the relative left and right shift amounts. C is moved in the in-plane direction (XY direction).

  The image size changing unit 8d performs initial reduction determined by a reduction rate determination unit 8e described later on the two radiographic image signals of the left-eye radiographic image and the right-eye radiographic image read from the radiographic image storage unit 8b. The stereo image generated by the two radiographic image signals of the reduced left-eye radiographic image and the right-eye radiographic image is displayed on the monitor 9 via the display control unit 8c, and the reduced left-eye radiographic image is displayed. A display control unit that expands two radiographic image signals of a radiographic image and a right-eye radiographic image at a predetermined enlargement ratio, and generates a stereo image generated by the enlarged two radiographic image signals of the left-eye radiographic image and the right-eye radiographic image It is displayed on the monitor 9 via 8c. The processing of the image size changing unit 8d will be described in detail later.

  The reduction rate determination unit 8e reads an angle formed by two different shooting directions (hereinafter referred to as a convergence angle α) for shooting a preset stereo image, and the information on the read convergence angle α is captured. The initial reduction rate of the two radiographic images of the left-eye radiographic image and the right-eye radiographic image read from the radiographic image storage unit 8b is determined based on the thickness of the breast, and the stereo image is stereoscopically viewed. In addition, the initial reduction ratio is determined so that the parallax can be recognized as a thick image, that is, a stereoscopic image. A specific method for determining the initial reduction ratio will be described later in detail.

  In the present embodiment, the thickness information of the breast M in a compressed state is acquired as the thickness of the breast to be photographed, and the breast M is installed as shown in FIG. A distance t from the upper surface of the imaging table 14 to the lower surface of the compression plate 18 in a state where M is compressed is calculated based on positional information of the compression plate 18 output from the compression plate controller 34. The method for acquiring the thickness information of the breast M is not limited to this. For example, the thickness information of the breast M in a compressed state is acquired in advance, and the thickness information is input by the input unit 40. If so, the input thickness information can be acquired.

  The position acquisition unit 8f acquires position information of the predetermined three-dimensional target M1 input on the stereo image, and specifically corresponds to the pixel indicated by the origin position of the scale cursor C on the stereo image. The position information of the pixel indicated by the scale cursor C in the left-eye radiographic image and the right-eye radiographic image is obtained, and the three-dimensional target of the abnormal shadow, calcification, lesion or the like indicated by the scale cursor C is obtained by, for example, triangulation Position information is acquired, and the position information is output to the control unit 8a.

  The monitor 9 is configured to display a stereo image by using the two radiographic image signals output from the computer 8 to display the radiographic image for each imaging direction as a two-dimensional image.

  As a configuration for displaying a stereo image, for example, a radiographic image based on two radiographic image signals is displayed using two screens, and one of the radiographic images is observed by using a half mirror or a polarizing glass. It is possible to adopt a configuration in which a stereo image is displayed by being incident on the right eye of the observer and the other radiation image is incident on the left eye of the observer.

  Or, for example, two radiographic images may be displayed in a superimposed manner while being shifted by a predetermined amount of parallax, and this may be configured to generate a stereo image by observing with a polarizing glass, or a parallax barrier method and a lenticular method As described above, a stereo image may be generated by displaying two radiation images on a stereoscopically viewable 3D liquid crystal. In addition, the device that displays a stereo image and the device that displays a two-dimensional image may be configured separately, or may be configured as the same device if they can be displayed on the same screen.

  Next, the operation of the stereo biopsy device 1 will be described with reference to the flowchart shown in FIG.

  First, the breast M is installed on the imaging table 14, the breast M is compressed by the compression plate 18 with a predetermined pressure (S1), and the thickness of the breast M in a state where the reduction rate determination unit 8e is compressed by the compression plate 18. Information is acquired (S2).

  Next, after various shooting conditions are input by the photographer in the input unit 7, an instruction to start shooting is input (S3). At this time, the biopsy needle unit 22 is retracted upward, and the breast M has not been punctured yet.

  When there is an instruction to start imaging in the input unit 7 (S3), imaging of the first radiographic image of the two radiographic images constituting the stereo image of the breast M is performed (S4). Specifically, first, the controller 8a reads an angle α (hereinafter referred to as a convergence angle α) formed by two different shooting directions in order to capture a preset stereo image, and the read convergence angle α. Is output to the arm controller 31. In the present embodiment, α = ± 15 °, that is, 30 ° is stored in advance as information on the convergence angle α at this time. However, the present invention is not limited to this, and the monitor 9 displays a stereo image. The convergence angle α may be any angle that allows the observer to recognize the breast M as a stereoscopic image having a stereoscopic effect. For example, any angle may be used as long as the angle is 4 ° to 30 °.

  The arm controller 31 receives the information on the convergence angle α output from the control unit 8a, and the arm controller 31 receives the information on the convergence angle α based on the information on the convergence angle α. A control signal is output so as to rotate by + α ° with respect to a direction perpendicular to. That is, in the present embodiment, a control signal is output so that the arm unit 13 is rotated + 15 ° with respect to a direction perpendicular to the imaging table 14.

  In response to the control signal output from the arm controller 31, the arm unit 13 rotates by + 15 °. Subsequently, the control unit 8a outputs a control signal to the radiation source controller 32 and the detector controller 33 so as to perform radiation irradiation and readout of the radiation image signal. In response to this control signal, radiation is emitted from the radiation source 17, a radiation image obtained by imaging the breast M from the + 15 ° direction is detected by the radiation detector 15, and a radiation image signal is read by the detector controller 33. After predetermined signal processing is performed on the radiographic image signal, the radiographic image signal is stored in the radiographic image storage unit 8 b of the computer 8.

  Next, the second radiographic image of the two radiographic images constituting the stereo image of the breast M is taken (S5). Specifically, as shown in FIG. 2, the arm controller 31 outputs a control signal so as to rotate the arm unit 13 by −α ° with respect to a direction perpendicular to the imaging table 14. That is, in the present embodiment, the control signal is output so that the arm unit 13 is rotated by −15 ° with respect to the direction perpendicular to the imaging table 14.

  In response to the control signal output from the arm controller 31, the arm portion 13 rotates by -15 °. Subsequently, the control unit 8a outputs a control signal to the radiation source controller 32 and the detector controller 33 so as to perform radiation irradiation and radiation image reading. In response to this control signal, radiation is emitted from the radiation source 17, a radiation image obtained by imaging the breast M from the −15 ° direction is detected by the radiation detector 15, and a radiation image signal is read by the detector controller 33, After the predetermined signal processing, the radiation image storage unit 8b of the computer 8 stores the signal.

  Next, the reduction rate determination unit 8e determines the initial reduction rates of the images represented by the image signals of the two radiographic images stored in the radiographic image storage unit 8b, that is, the left-eye radiographic image and the right-eye radiographic image (S6). . Here, FIG. 6 shows a diagram for explaining reduction of a stereo image.

  Generally, in order to display a breast in a stereo image generated by using a left-eye radiographic image and a right-eye radiographic image so that an observer can easily recognize it as a stereoscopic image, a left-eye radiographic image is used. The right-eye radiographic image needs to be acquired by stereo imaging with a convergence angle α = about 4 degrees. However, in order to obtain the three-dimensional coordinate position of the position indicated by the target in the breast image with high accuracy, the convergence angle α is determined in the radiation detector so that the overlapping of the areas of the portions irradiated with radiation becomes large. Therefore, the stereo biopsy device 1 acquires a high-resolution radiation image by performing stereo imaging at a convergence angle α = 30 degrees as described above.

Therefore, in this embodiment, when the compression thickness of the breast acquired in step S2 is 60 mm, the image represented by the image signals of the two radiation images stored in the radiation image storage unit 8b, that is, the left-eye radiation image _DL and displacement amount i.e. the amount of parallax of the subject in the right-eye radiographic image D _R is the parallax amount of the left-eye radiographic image and the right-eye radiographic image acquired by the stereo imaging breast compression thickness 60mm in convergence angle alpha = 4 ° The initial reduction ratio is determined to be 1/8 so as to be the same degree. For example, when a breast is captured in stereo with a convergence angle α = 30 degrees and a compression thickness greater than 60 mm, the initial reduction ratio is set to a value smaller than 1/8. When a breast with a compression thickness of 60 mm and an angle of convergence smaller than 30 degrees is stereo-photographed, the initial reduction ratio is set to a value larger than 1/8. In this way, according to the value of the convergence angle α and the compression thickness of the breast, the initial amount is set so that the observer can easily stereoscopically view the breast in the stereo image generated using the reduced radiographic image. Determine the reduction ratio.

Then the image resizing unit 8d, as shown in FIG. 6, to reduce the left-eye radiation image D _L and the radiographic D _R for the right eye with an initial reduction ratio 1/8 as determined by the reduction ratio determining unit 8e, reduced has been to produce a radiation image SD _L and the radiographic SD _R for the right eye left eye (S7). The image resizing module 8d displays the stereo image of the reduced breast M generated using a reduced radiation image SD _L and the right-eye radiation image SD _R for the left eye via the display control unit 8c on the monitor 9 (S8).

Then the image resizing unit 8d is reduced enlarged left-eye radiation image SD _L and the right-eye radiographic image SD _R gradually (S9), and gradually enlarged left-eye radiation image via the display control unit 8c D _L and using the right-eye radiographic image D _R and displays the stereo image of the generated breast M in order to monitor 9 (S10). Here, a diagram illustrating the enlargement of the stereo image of FIG. 7 is shown.

Image size changing section 8d, as shown in FIG. 7, the reduced left-eye radiation image SD _L and the right-eye radiographic image SD _R a T1, T2, T3, ···, T6, ··· 1.5 The image is enlarged and displayed on the monitor 9. At this time, the display control unit 8c, as shown in FIG. 7, to synthesize the scale cursor C an enlarged scale in accordance with the enlargement factor to each of the enlarged left-eye radiation image D _L and the right-eye radiographic image D _R Accordingly, to display the scale cursor C with stereo image composed on the monitor 9 in the left-eye radiation image D _L and the right-eye radiographic image D _R (S11). The scale of the scale cursor C is 1 mm.

  In this embodiment, the enlargement ratio is 1.5 times, but the present invention is not limited to this, and the observer may input a favorite enlargement ratio from the input unit 7.

Since the accuracy required for targeting the region of interest in the stereo biopsy device 1 is within a range of 1 mm from the region of interest, the radiographic image D for the left eye until the target becomes possible with this accuracy while observing the stereo image. _L and to expand the right-eye radiographic image D _R.

In this embodiment, since the scale cursor C with a scale of 1 mm is displayed, the observer confirms the size of the region of interest with the scale cursor C while stereoscopically viewing the stereo image, and the observer targets with the accuracy described above. if left click, for example, a mouse when it is determined that the left-eye radiation image D _L and the right-eye radiographic image D _R is enlarged to the size which can be adapted to stop the spread of the image.

Thereby, stereoscopic shooting when the size of the left-eye radiation image D _L and the stereo image in targeting levels not expanded to the right-eye radiographic image D _R becomes possible. Further, when the observer be expanded to the left-eye radiation image D _L and the radiographic D _R for the right eye before size i.e. reduction at the time of photographing it is determined that it is impossible to still targeting in the accuracy is further left You can enlarge the use radiographic image D _L and the radiographic D _R for the right eye, so the viewer can arbitrarily determine the final left radiation image D _L and the magnitude of the right-eye radiographic image D _R The accuracy of targeting in the stereo biopsy device 1 can be improved.

When the scale cursor C with stereo images enlarged left-eye radiation image D _L and the right-eye radiographic image D _R constitutes are sequentially displayed on the monitor 9, the control unit 8a in magnification stereo image displayed is desired It is determined whether or not there is an input from the input unit 7 when the observer left-clicks the mouse (S12).

  When it is determined that the control unit 8a does not have the desired enlargement ratio (S12; NO), the process proceeds to step S9, and the subsequent processing is repeated to determine that the desired enlargement ratio is obtained ( In S12; YES), the position acquisition unit 8f next determines whether or not the three-dimensional target M1 desired by the observer has been determined by, for example, pressing the enter key of the keyboard by the observer (S13). . The observer designates the three-dimensional target M1 by moving the origin position of the scale cursor C displayed on the monitor 9 onto the desired three-dimensional target M1 by operating the input unit 7, and pressing the enter key. Can be done by pressing.

Note that the scale cursor C can be moved to an arbitrary position in the monitor 9 by the observer operating the input unit 7, whereby the observer determines whether or not the desired enlargement ratio has been achieved. It becomes easy. If the scale cursor C is moved by the viewer, the display control section 8C, in enlarged radiographic image D _L and the right-eye radiographic image D _R for the left eye is generated after movement of the scale cursor C, the position after the movement Is reflected to synthesize the scale cursor C.

  If it is determined that the three-dimensional target M1 has not been determined (S13; NO), the process of step S13 is repeated until the three-dimensional target M1 is determined, and it is determined that the three-dimensional target M1 has been determined ( In S13; YES), the position acquisition unit 8f acquires the determined position coordinates of the three-dimensional target M1, that is, the position coordinates of the pixel indicated by the origin of the scale cursor C (S14).

  In the present embodiment, the position of the three-dimensional target M1 is determined by moving the origin position of the scale cursor C onto the desired three-dimensional target M1, but the present invention is not limited to this. In addition to C, a three-dimensional cursor displayed in three dimensions is displayed, and the three-dimensional target M1 is determined by moving the three-dimensional cursor onto the desired three-dimensional target M1 by operating the input unit 7. Also good. In this case, the solid cursor can have an arrow shape, a round shape, a triangular shape, or the like.

  The position acquisition unit 8f corresponds to the position indicated by the three-dimensional target M1, and the coordinate positions (x2, y2) and (x3, y3) of the corresponding pixels indicated by the scale cursor C in the left-eye radiographic image and the right-eye radiographic image, respectively. And the three-dimensional position coordinates (x1) of the pixel indicated by the scale cursor C, for example, by triangulation based on the coordinate positions (x2, y2) and (x3, y3) of the corresponding pixels indicated by the acquired cursor C. , Y1, z1).

  The position acquisition unit 8f uses the acquired three-dimensional position coordinates (x1, y1, z1) of the pixel indicated by the scale cursor C, that is, the three-dimensional target position (x1, y1, z1), as the needle position controller of the biopsy unit 2. 35.

  When a predetermined operation button is pressed in the input unit 7, a control signal for moving the biopsy needle 21 is output from the control unit 8 a to the needle position controller 35. Based on the previously input three-dimensional coordinate position (x1, y1, z1), the needle position controller 35 is arranged so that the tip of the biopsy needle 21 is arranged at the three-dimensional coordinate position (x1, y1, z1 + α). The biopsy needle 21 is moved. Here, α is set to a sufficiently large value such that the biopsy needle 21 does not pierce the breast M. Thereby, the biopsy needle 21 is set above the three-dimensional target.

  When a predetermined operation for instructing the biopsy needle 21 to be punctured by the observer is performed on the input unit 7, the tip of the biopsy needle 21 is controlled by the three-dimensional coordinate position (x1) under the control of the control unit 8a and the needle position controller 35. , Y1, z1) and the biopsy needle 21 punctures the breast M (S15). In this way, the stereo biopsy device 1 performs biopsy.

  As described above, according to the stereo biopsy device 1, the monitor 9 for displaying a stereoscopically viewable stereo image using two radiographic images acquired by radiographing the breast from two imaging directions is provided. Two radiographic images are reduced at an initial reduction rate determined from an angle (convergence angle α) formed by two imaging directions and a compression thickness of the breast, and the two radiographic images reduced are used. The generated stereo image is displayed on the monitor 9, the two reduced radiographic images are enlarged at a predetermined enlargement ratio, and the stereo image generated using the two enlarged radiographic images is displayed on the monitor 9. As described above, the two radiographic images can be reduced to an appropriate size according to the compression thickness and the convergence angle α of the imaged breast, and the two reduced radiographic images are reduced. Breast compared to before 8 when the display condition is the same as that of the stereoscopic image before reduction by reducing the value of the convergence angle α in FIG. 8 when the stereoscopic image is displayed. In addition, since the parallax angle | α−β | becomes small, it becomes easy for the observer to stereoscopically view the site of interest, and the discomfort and fatigue of the observer can be reduced.

  By further displaying the enlarged two radiation images, the observer fuses the reduced stereoscopic image and views the enlarged stereoscopic image while maintaining the fusion. Therefore, it is possible to reduce the state where it is difficult to fuse.

  In general, once a stereoscopic image that has been successfully fused is to be stereoscopically viewed again, the viewer can easily stereoscopically view the enlarged stereoscopic image in a short time, regardless of the size. it can.

Note in the above embodiment, image size changing section 8d is has been possible to display an enlarged gradually stepwise the radiation image D _L and the right-eye radiographic image D _R for the left eye reduction in the initial reduction ratio, The present invention is not limited to this. For example, an image of a size before being reduced may be displayed with a single enlargement, or may be enlarged once to an arbitrary size of an observer. May be displayed. In this way, in general, once a stereoscopic image that has been successfully fused is to be stereoscopically viewed again, the viewer can easily view the stereoscopic image in a short time, regardless of the size. Can be seen.

The image size changing section 8d may be displayed in an enlarged left-eye radiation image D _L and the radiographic D _R for the right eye that has been reduced by the initial reduction rate gradually steplessly. By doing so, the observer can fuse the reduced stereoscopic image and continuously view the enlarged stereoscopic image while maintaining the fusion, thereby reducing the state where the fusion is difficult. In addition, the observer can become accustomed to the stereoscopic viewing by continuously performing the stereoscopic viewing, thereby reducing the discomfort and fatigue of the observer when the parallax angle | α−β | Can do.

In the above-described embodiment, the display control unit 8c displays the scale cursor C together with the stereo image on the monitor 9. However, the present invention is not limited to this, and the scale cursor C may not be displayed. Good. In this case, the left-eye radiation image D _L and the radiographic D _R for the right eye that has been reduced by the initial reduction ratio, for example, until the magnitude before being reduced can be displayed gradually enlarge 6 stages .

  In the above description, the breast M has been described as a subject. However, the subject is not particularly limited. For example, a breast or head is photographed as a subject, and a biopsy needle is punctured at the position displayed most white. The present invention can also be applied to a stereo biopsy device.

  Moreover, although the said embodiment demonstrated the stereo biopsy apparatus, this invention is not limited to this, It is applicable also to the stereoscopic vision image display apparatus by which the biopsy function is not mounted. In the stereoscopic image display device of the present invention that is not equipped with a biopsy function, the target can be easily viewed stereoscopically when the observer targets a region of interest such as a lesion in the stereoscopic image.

The present invention can also be applied to a radiographic imaging display apparatus that images a subject such as a chest or a head, not limited to a breast.
The present invention is not limited to the contents of the above-described embodiments, and can be appropriately changed without departing from the spirit of the invention.

M breast (subject)
C Scale cursor 1 Stereo biopsy device (stereoscopic image display device)
7 Input unit 8c Display control unit 8d Image size change unit 8e Reduction rate determination unit 8f Position acquisition unit 9 Monitor (display unit)
15 Radiation detector 17 Radiation source

Claims (10)

A display unit that displays a stereoscopic image that can be stereoscopically viewed using a plurality of radiographic images acquired by radiographing a subject from at least two imaging directions;
A reduction rate determining unit for determining an initial reduction rate of the plurality of radiation images from an angle formed by the two imaging directions and a thickness of the subject; and the plurality of radiations at an initial reduction rate determined by the reduction rate determining unit. An image is reduced, a stereoscopic image generated using the reduced plurality of radiation images is displayed on the display unit, the plurality of reduced radiation images are enlarged at a predetermined enlargement ratio, and the enlarged image is displayed. A stereoscopic image display device comprising: an image size changing unit that displays a stereoscopic image generated using a plurality of radiation images on the display unit.   The stereoscopic image display apparatus according to claim 1, further comprising a cursor display control unit configured to display a scaled cursor together with the stereoscopic image on the display unit.   The stereoscopic image display apparatus according to claim 1, wherein the image size changing unit gradually enlarges the plurality of reduced radiographic images.   The stereoscopic image display apparatus according to claim 3, wherein the image size changing unit enlarges the plurality of reduced radiation images in a stepwise manner.   The stereoscopic image display device according to claim 3, wherein the image size changing unit enlarges the plurality of reduced radiation images steplessly. Stereoscopic view using a stereoscopic image display device including a display unit that displays a stereoscopically viewable stereoscopic image using a plurality of radiographic images acquired by radiographing a subject from at least two imaging directions. An image display method,
Reducing the plurality of radiographic images at an initial reduction ratio determined from an angle formed by the two imaging directions and the thickness of the subject;
Displaying a stereoscopic image generated using the reduced plurality of radiation images on the display unit;
Enlarging the reduced plurality of radiographic images at a predetermined magnification,
A stereoscopic image display method, comprising: displaying a stereoscopic image generated using the enlarged plurality of radiation images on the display unit.   The stereoscopic image display method according to claim 6, wherein a scaled cursor is displayed together with the stereoscopic image on the display unit.   The stereoscopic image display method according to claim 6, wherein the plurality of reduced radiographic images are gradually enlarged.   9. The stereoscopic image display method according to claim 8, wherein the plurality of reduced radiographic images are enlarged stepwise.   The stereoscopic image display method according to claim 8, wherein the plurality of reduced radiographic images are enlarged steplessly.