JP2007068556A - Image display device and image display program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device or the like which enables the observation of a tissue distributed in the entire surface of a three-dimensional object such as cronaria without being deviated from the surface of the object. <P>SOLUTION: Extraction data corresponding to an object to be diagnozed based on a volume data relating to a prescribed area of a specimen containing the object to be diagnozed (for example, heart). The direction and degree of movement are designated for an MPR image in which at least a part of the surface of the object to be diagnozed is visualized to move it along the surface of the object to be diagnozed with an operating part. An image is generated and displayed as acquired by moving the MPR image along the surface of the object to be diagnozed using the direction and degree of movement designated, the extraction data and the volume data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image display apparatus that displays a three-dimensional image or the like using a tomographic image collected and reconstructed by an image diagnostic apparatus typified by an X-ray computed tomography apparatus. In particular, the present invention relates to a material used for observing a tissue attached to the surface of an object simply and in detail.

  Image display devices used in the medical image field in recent years are used in combination with medical imaging equipment such as ultrasonic diagnostic equipment, X-ray computed tomography equipment, magnetic resonance imaging equipment, and many hospitals, examination institutions, etc. Widely used in This image display device has advanced image processing and improved resolution, and can provide various images useful as clinical information. For example, in a simulation before surgery, blood vessel running, gastrointestinal tumor, plaque (spots) ), And imaging of the digestive tract cavity when examining the cause of stenosis, etc.

  In such an image display device, for example, an MPR image or a slab of reconstructed volume data acquired by an X-ray computed tomography device or the like installed in a 3D workstation called “M900 QUADRA” manufactured by Ziosoft Corporation. There is a technique for displaying a MIP image and a curved MPR image along a curve.

In addition, as a well-known document relevant to this application, there exist the following, for example.
JP-A-5-346963 Shujunsha "I see! Three-dimensional medical image, thinking and processing method, Torano no Maki"

  However, when displaying an MPR image, a slab MIP image, or the like of three-dimensional volume data using a conventional image display device, there are the following problems.

  For example, when it is desired to observe the shape of the coronary artery attached to the surface of the heart, first, the coronary artery on the MPR image or slab MIP image must be matched with the position and orientation to be observed. For this reason, it is necessary to perform operations such as cross-sectional movement and rotation of the MPR / slab MIP image in stages, which is a heavy work burden for the operator. Furthermore, when observing another coronary artery after observing a certain coronary artery, it is necessary to repeat cross-sectional movement and rotation of the MPR / slab MIP image again, which is very laborious.

  In order to observe the shape of the coronary artery in more detail, a curved MPR image or the like may be created by drawing a curve along the coronary artery on the aligned MPR / slab MIP image. The work of drawing a curve along the coronary artery in such a case also imposes a larger work burden on the operator.

  The present invention has been made in view of the above circumstances, and there is no need to perform troublesome operations in cross-sectional movement, rotation, etc. of MPR images, slab MIP images, etc. Thus, an object of the present invention is to provide an image display device and an image display program capable of observing a tissue distributed over the entire surface of a three-dimensional object.

  In order to achieve the above object, the present invention takes the following measures.

  A first aspect of the present invention is a storage unit that stores volume data relating to a predetermined region of a subject including a diagnosis target, and an extraction data generation unit that generates extraction data corresponding to the diagnosis target based on the volume data. Generating a first image for visualizing at least a part of the surface to be diagnosed, designating means for designating a moving direction and a moving amount for moving the first image along the surface to be diagnosed, and generating the first image Image generating means for generating a second image obtained by moving the first image along the surface to be diagnosed using the moving direction, the moving amount, the extracted data, and the volume data; Display means for displaying the second image or the second image.

  According to a second aspect of the present invention, an extraction data generation function for generating extraction data corresponding to the diagnostic object based on volume data relating to a predetermined region of the subject including the diagnostic object, A designation function for designating a movement direction and a movement amount for moving a first image that visualizes at least a part along the surface to be diagnosed, a first function for generating the first image, and the movement direction and the movement. An image generation function for generating a second image obtained by moving the first image along the surface to be diagnosed using the amount, the extracted data, and the volume data; and the first image or the second image An image display program characterized by realizing a display function for displaying an image.

  As described above, according to the present invention, it is not necessary to perform troublesome operations in cross-sectional movement, rotation, etc. of MPR images, slab MIP images, etc., and distributed over the entire surface of a three-dimensional object such as a coronary artery without warping from the object surface. An image display device and an image display program capable of observing a tissue can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, components having substantially the same function and configuration are denoted by the same reference numerals, and redundant description will be given only when necessary.

  FIG. 1 is a block diagram of an image reference device 10 according to this embodiment. As shown in the figure, the image reference device 10 includes a three-dimensional volume data storage unit 11, a three-dimensional region extraction unit 13, a VR (Volume Rendering) image creation unit 14, a three-dimensional region smoothing unit 15, an image position / An orientation calculation unit 17, an MPR image creation unit 19, a curved surface MPR image creation unit 21, a modified curved surface MPR image creation unit 23, a display / operation control unit 24, a display unit 25, and an operation unit 27 are provided.

  The three-dimensional volume data storage unit 11 stores three-dimensional volume data V (X, Y, Z) acquired by various medical imaging devices such as an X-ray computed tomography apparatus and a magnetic resonance imaging apparatus.

  The three-dimensional region extraction unit 13 performs region extraction within a threshold range set by an operator or the like using the three-dimensional volume data V (X, Y, Z) acquired from the three-dimensional volume data storage unit 11. Region extraction data S (X, Y, Z) is generated.

  The VR image creation unit 14 includes the three-dimensional volume data V (X, Y, Z) obtained from the three-dimensional volume data storage unit 11 and the three-dimensional region extraction data S (X , Y, Z) to create a VR image.

  The three-dimensional region smoothing unit 15 smoothes the unevenness of the surface of the three-dimensional region extraction data S (X, Y, Z) obtained from the three-dimensional region extraction unit 13 by smoothing processing, and the smoothed three-dimensional region The region extraction data F (X, Y, Z) is provided to the outside.

  The image position / orientation calculation unit 17 uses the screen coordinates (x1, y1) obtained from the display / operation control unit 24 and the smoothed three-dimensional region extraction data F (X , Y, Z), the volume coordinates (X1, Y1, Z1) of the surface position of the region extraction data F (X, Y, Z) existing in the screen depth direction of the screen coordinates and the surface of that position Find the orthogonal vector v.

  The MPR image creation unit 19 uses the surface position (X1, Y1, Z1) obtained from the image position / orientation calculation unit 17 as the center position, and is orthogonal to the surface orthogonal vector v obtained from the image position / orientation calculation unit 17 as well. The MPR image or slab MIP image f1 (x, y) to be created is created using the three-dimensional volume data V (X, Y, Z) obtained from the three-dimensional volume data storage unit 11.

  The curved surface MPR image creating unit 21 uses the surface position (X1, Y1, Z1) obtained from the image position / orientation calculating unit 17 as the center position, and also converts the surface orthogonal vector v obtained from the image position / orientation calculating unit 17 to the surface orthogonal vector v. A curved MPR image along a curve representing the surface of the smoothed three-dimensional region extraction data F (X, Y, Z) obtained from the three-dimensional region smoothing unit 15 on the parallel plane (y, z). Alternatively, the curved surface slab MIP image f2 (x, y) is created using the three-dimensional volume data V (X, Y, Z) obtained from the three-dimensional volume data storage unit 11.

  The deformed curved surface MPR image creation unit 23 uses the surface position (X1, Y1, Z1) obtained from the image position / orientation calculation unit 17 as the center position, and the surface orthogonal vector v obtained from the image position / orientation calculation unit 17 similarly. A curved surface along a curve representing the surface of the smoothed three-dimensional region extraction data F (X, Y, Z) obtained from the three-dimensional region smoothing unit 15 on a plane (y, z) parallel to Further, the curved surface MPR image or the curved surface slab MIP image f3 (x, y) deformed so as to follow the surface in the direction orthogonal to the curve (X-axis direction) is obtained from the three-dimensional volume data storage unit 11. Created using original volume data V (X, Y, Z) and displayed on the screen. Specifically, the pixel value f3 (xi, yj) of the curved surface MPR image at the sampling point y = yj on the curve is orthogonal to the object surface at the position (xi, yj) on the volume (y = yj). Direction: The pixel value of the object surface position existing in -vn) is adopted. Further, the deformed curved surface MPR image creating unit 23 calculates the image position / orientation of the screen coordinates (x1, y1) of the position obtained by adding the vector amount that the operator drags the mouse on the image display area to the center coordinates of the image display area. Provided to part 17 and the like.

  The display / operation control unit 24 calculates the screen coordinates (x1, y1) of the position where the operator clicks the mouse on the display screen, and provides it to the image position / orientation calculation unit 17 and the like. In addition, the display / operation control unit 24 uses the position obtained by adding the vector amount that the operator drags the mouse over the image display area to the coordinates of the center position of the image display area as the screen coordinates (x1, y1). This is provided to the calculation unit 17. Further, the display / operation control unit 24 performs control for displaying the image created by each creation unit on the display unit 27.

  The display unit 25 displays an image, a report input screen, an input screen for performing a predetermined operation, an image acquired by various medical image devices, an image obtained by a moving display function along an object surface, which will be described later, in a predetermined form. Is displayed.

  The operation unit 27 includes a trackball, various switches, a mouse, a keyboard, and the like for incorporating various instructions, conditions, and the like from the operator into the apparatus 1.

(Moving display function along the object surface)
Next, the moving display function along the object surface of the image display apparatus 1 will be described.

  FIG. 2 is a diagram for explaining the concept of the moving display function along the surface of the object. As shown in the figure, in the case where an MPR image or the like relating to the surface of a region-extracted object (for example, a heart) is displayed, the moving display function causes the MPR image to slide on the object surface when the image is panned. Display to move. Thereby, it is not necessary to perform troublesome operations such as cross-sectional movement and rotation of the MPR image, and the MPR image attached to the surface of the three-dimensional object is moved so as not to bend from the object surface, for example, a coronary artery or the like. Thus, the tissue distributed over the entire surface of the three-dimensional object can be observed without hesitation.

  The movement along the object surface is not limited to the MPR image shown in FIG. 2, but a slab MIP image, a curved MPR image (or curved slab MIP image), or a modified curved MPR image (or modified curved slab MIP image) is used. Can also be executed. Here, the slab MIP image is an image generated by performing MIP using rectangular parallelepiped region (slab) data in which the x and y directions are the directions of the image plane and the z direction is the thickness direction of the image plane. is there. A curved slab MIP image is obtained by using a slab data having a curvature corresponding to the object surface in the z direction with respect to one of the two directions x and y with respect to the slab data with the z direction as the thickness direction. , An image generated by performing MIP. A deformed curved surface slab MIP image is an image generated by performing MIP using a slab data having a curvature corresponding to the object surface in two directions x and y (deformed curved surface slab).

  Hereinafter, processing according to the moving display function along the object surface (on the object surface) in each case of an MPR image (slab MIP image), a curved surface MPR image (curved surface slab MIP image), and a modified curved surface MPR image (modified curved surface slab MIP image) Next, the movement display process will be described.

(MPR image / slab MIP image)
FIG. 4 is a flowchart showing the flow of the movement display process along the object surface of the MPR image (or slab MIP image). FIG. 5 is a diagram for explaining the processing in steps A1 and A2 of FIG. 4, and the VR screen coordinate system (x, y) and volume coordinate system (X, Y) set in the display / operation control unit 24. Y, Z).

  As shown in FIG. 5, first, when the operator specifies an arbitrary position (x1, y1) on the screen via the mouse of the operation unit 27 (step A1), the display / operation control unit 24 The screen coordinates (x1, y1) of the position where the mouse is clicked on the display screen are calculated and provided to the image position / orientation calculation unit 17 and the like. The image position / orientation calculating unit 17 has coordinates (volume coordinates) (X1, Y1, Z1) on the volume data corresponding to the position (x1, y1) on the screen and the volume coordinates (X1, Y1, Z1). The surface orthogonal vector v orthogonal to the surface of the image is calculated using the three-dimensional region extraction data F (X, Y, Z) (step A2).

  Next, as shown in FIG. 6, the MPR image creation unit 19 has an MPR image (or slab MIP image) f1 (x, y) orthogonal to the surface orthogonal vector v with the volume coordinate (X1, Y1, Z1) as the center position. ) Is created using the three-dimensional volume data V (X, Y, Z) obtained from the three-dimensional volume data storage unit 11. The display / operation control unit 24 displays the generated MPR image (or slab MIP image) f1 (x, y) on the screen of the display unit 25 in a predetermined form (step A3).

  Next, it is determined whether or not there is a mouse drag on the display screen (that is, whether or not there is a request for moving the display image (such as panning of an object)) (step A4). If it is determined that dragging has not been performed on the display screen, the current MPR image is continuously displayed (step A6).

  On the other hand, when dragging is performed on the display screen, the display / operation control unit 24 calculates the movement vector u from the position on the screen after dragging and the position on the screen before dragging, as shown in FIG. The calculated value is added to the position (x1, y1) at the center of the screen as a new position (x1, y1), which is provided to the image position / orientation calculation unit 17 (step A5). The image position / orientation calculation unit 17 uses the position (x1, y1) newly acquired in this way, a new object surface position (volume coordinates (X1, Y1, Z1)), and a surface orthogonality orthogonal to the surface of the position. Calculate the vector v. The MPR image creation unit 19 uses the recalculated volume coordinates (X1, Y1, Z1), surface orthogonal vector v, and volume data V (X, Y, Z) to move the MPR image (or slab MIP image). ) F1 (x, y) can be generated.

  The moved MPR image f1 (x, y) generated in this way is displayed on the display unit 25 via the display / operation control unit 24. Such moving display of the MPR image f1 (x, y) corresponds to displaying the MPR image while moving along the object surface by dragging the display screen with the mouse.

(Curved surface MPR image, curved surface slab MIP image)
FIG. 8 is a flowchart showing the flow of the movement display process along the object surface of the curved MPR image (or curved slab MIP image). Compared to FIG. 4, only step B3 is substantially different. Hereinafter, the process in step B3 will be described.

  As shown in FIG. 8, in step B2, the curved surface MPR image creating unit 21 has a curved surface MPR image (or curved surface slab MIP image) f2 (centered at the volume coordinates (X1, Y1, Z1)) and orthogonal to the surface orthogonal vector v. x, y), the volume coordinates (X1, Y1, Z1) calculated by the image position / orientation calculation unit 17 and the surface orthogonal vector v, and the three-dimensional volume data V ( (X, Y, Z) and is displayed on the screen of the display unit 25 via the display / operation control unit 24 (step B3).

  FIG. 9 is a diagram for explaining the processing in step B3. As shown in the figure, the volume coordinate (X1, Y1, Z1) is the center position, and the three-dimensional region extraction data F (X, Y, Z) on the plane (y, z) parallel to the surface orthogonal vector v A curved MPR image (or curved slab MIP image) f2 (x, y) along the curve representing the surface is created using the three-dimensional volume data V (X, Y, Z). Accordingly, the curved MPR image f2 (x, y) has a curvature corresponding to the object surface with respect to the y axis.

(Deformed curved MPR image)
FIG. 10 is a flowchart showing a flow of the movement display process along the object surface of the modified curved surface MPR image (or modified curved surface slab MIP image). Compared to FIG. 4, only step C3 is substantially different. Hereinafter, the process in step C3 will be described.

  As shown in FIG. 10, in step C2, the deformed curved surface MPR image creation unit 23 has a deformed curved surface MPR image (or a deformed curved surface slab MIP image) centered on the volume coordinates (X1, Y1, Z1) and orthogonal to the surface orthogonal vector v. ) F3 (x, y), the volume coordinate (X1, Y1, Z1) calculated by the image position / orientation calculation unit 17 and the surface orthogonal vector v, and the three-dimensional volume obtained from the three-dimensional volume data storage unit 11 The data V (X, Y, Z) is created and displayed on the screen of the display unit 25 via the display / operation control unit 24 (step B3).

  FIG. 11 is a diagram for explaining the processing in step C3. As shown in the figure, the curved surface MPR image f2 (x, y) generated in step B3 (that is, a plane (y, z) parallel to the surface orthogonal vector v with the volume coordinate (X1, Y1, Z1) as the center position. ) A deformed curved surface MPR image (or a deformed curved surface slab MIP) obtained by deforming the curved surface along the curve representing the surface of the three-dimensional region extraction data F (X, Y, Z)) along the surface in the x-axis direction. Image) f3 (x, y) is created using the three-dimensional volume data V (X, Y, Z). Accordingly, the deformed curved surface MPR image f3 (x, y) is a cubic representing the surface of the three-dimensional region extraction data F (X, Y, Z) on the plane (y, z) and the plane (x, z). It is composed of pixels that are intersections with a curve representing the surface of the original area extraction data F (X, Y, Z), and has a curvature corresponding to the object surface with respect to the x-axis and the y-axis.

(Operation)
Next, an object display operation using the moving display function along the object surface of the image display apparatus 10 will be described. In the present embodiment, for the sake of specific explanation, the case where the coronary artery of the heart is observed and diagnosed is taken as an example.

  FIG. 12 is a flowchart showing the flow of each process executed in the object display operation using the moving display function. As shown in the figure, first, the three-dimensional region extraction unit 13 loads the three-dimensional volume data V (X, Y, Z) from the three-dimensional volume data storage unit 11 (step S1). The three-dimensional region extraction unit 13 receives a setting of an appropriate threshold value for extracting a region of a desired object (heart) by input from the operation unit 27 (step S2), and receives three-dimensional volume data V (X, Y, Region extraction data S (X, Y, Z) is generated by extracting the region of the threshold range from Z) (step S3).

  Next, the VR image generation unit 14 creates a VR image of the extraction region using the generated region extraction data S (X, Y, Z) and the three-dimensional volume data V (X, Y, Z). . The display unit 25 displays the generated VR image via the display / operation control unit 24 (step S3). Further, the three-dimensional region smoothing unit 15 smooths the unevenness of the surface of the three-dimensional region extraction data S (X, Y, Z) by the smoothing process, and smoothes the three-dimensional region extraction data F (X, Y, Z) is generated (step S5).

  Next, in response to a predetermined operation, display of an MPR image including a movement along the object surface, a curved MPR image, and a deformed curved MPR image is executed (step S6). The processing in this step is as described above.

  According to the configuration described above, the following effects can be obtained.

  According to this image display device, an MPR image or a slab MIP image can be moved and displayed while sticking to the surface of a region-extracted object. Therefore, the tissue distributed over the entire surface of a three-dimensional object such as a coronary artery can be removed from the object surface just by performing a mouse drag operation on the screen without performing troublesome operations such as moving and rotating the cross section of the image. It can be observed without warping.

  Further, according to the present image display device, not only the MPR image or slab MIP image but also the curved MPR image (or curved slab MIP image) and the modified curved MPR image (or modified curved slab MIP image) are selected as necessary. It can be moved and displayed while sticking to the surface of the extracted object. Therefore, a tissue distributed over the entire surface of a three-dimensional object such as a coronary artery can be observed in more detail without warping from the object surface.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Specific examples of modifications are as follows.

  (1) Each function according to the present embodiment can also be realized by installing a program for executing the processing in a computer such as a workstation and developing the program on a memory. At this time, a program that can cause the computer to execute the method is stored in a recording medium such as a magnetic disk (floppy (registered trademark) disk, hard disk, etc.), an optical disk (CD-ROM, DVD, etc.), or a semiconductor memory. It can also be distributed.

  In addition, various inventions can be formed by appropriately combining a plurality of constituent elements 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.

  As described above, according to the present invention, it is not necessary to perform troublesome operations in cross-sectional movement, rotation, etc. of MPR images, slab MIP images, etc., and distributed over the entire surface of a three-dimensional object such as a coronary artery without warping from the object surface. An image display device and an image display program capable of observing a tissue can be realized.

FIG. 1 is a block diagram of an image reference device 10 according to this embodiment. FIG. 2 is a diagram for explaining the concept of the moving display function along the surface of the object. FIGS. 3A and 3B illustrate a method for creating a curved MPR image (or curved slab MIP image), and FIG. 3C illustrates a method for creating a modified curved MPR image (or modified curved slab MIP image). FIG. FIG. 4 is a flowchart showing the flow of the movement display process along the object surface of the MPR image (or slab MIP image). FIG. 5 is a diagram for explaining the processing in steps A1 and A2 of the flowchart shown in FIG. 4, and the VR screen coordinate system (x, y) and volume coordinate system (set in the display / operation control unit 24). X, Y, Z). FIG. 6 is a diagram for explaining the processing in step A3 of the flowchart shown in FIG. FIG. 7 is a diagram for explaining the processing in step A5 of the flowchart shown in FIG. FIG. 8 is a flowchart showing the flow of the movement display process along the object surface of the curved MPR image (or curved slab MIP image). FIG. 9 is a diagram for explaining the processing in step B3 of the flowchart shown in FIG. FIG. 10 is a flowchart showing a flow of the movement display process along the object surface of the modified curved surface MPR image (or modified curved surface slab MIP image). FIG. 11 is a diagram for explaining the processing in step C3 of the flowchart shown in FIG. FIG. 12 is a flowchart showing the flow of each process executed in the object display operation using the moving display function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Image reference apparatus, 11 ... Three-dimensional volume data storage part, 13 ... Three-dimensional area extraction part, 14 ... VR image creation part, 15 ... Three-dimensional area smoothing part, 17 ... Image position and orientation calculation part, 19 ... MPR image creation unit, 21 ... curved MPR image creation unit, 23 ... modified curved MPR image creation unit

Claims (8)

Storage means for storing volume data relating to a predetermined region of the subject including the diagnostic object;
Extraction data generation means for generating extraction data corresponding to the diagnosis object based on the volume data;
Designating means for designating a moving direction and a moving amount for moving the first image for visualizing at least a part of the diagnostic target surface along the diagnostic target surface;
The first image is generated, and a second image is generated by moving the first image along the surface to be diagnosed using the moving direction, the moving amount, the extracted data, and the volume data. Image generating means for
Display means for displaying the first image or the second image;
An image display device comprising:   The image display apparatus according to claim 1, wherein the extraction unit generates the extraction data by performing segmentation based on a predetermined threshold.   The image generation means includes a reference position on the first image when the first image is moved in the movement direction by the movement amount, a corresponding point on the surface of the extraction data of the reference position, and The image display device according to claim 1, wherein the second image is generated based on an orthogonal vector orthogonal to the surface of the corresponding point.   The first image and the second image correspond to the object surface in two directions of x and y that define an image plane with respect to the MPR image, the slab MIP image, the curved surface MPR image, the curved surface slab MIP image, and the MPR image. MIP is performed using a deformed curved surface MPR image generated using a material having a curvature, and a material having a curvature corresponding to the object surface in two directions of x and y that define an image plane for slab data. 4. The image display device according to claim 1, wherein the image display device is any one of a deformed curved surface slab MIP image generated by the step S 4. On the computer,
An extraction data generation function for generating extraction data corresponding to the diagnosis object based on volume data relating to a predetermined region of the subject including the diagnosis object;
A designation function for designating a moving direction and a moving amount for moving the first image for visualizing at least a part of the diagnostic target surface along the diagnostic target surface;
The first image is generated, and a second image is generated by moving the first image along the surface to be diagnosed using the moving direction, the moving amount, the extracted data, and the volume data. Image generation function to
A display function for displaying the first image or the second image;
An image display program characterized by realizing the above.   6. The image display program according to claim 5, wherein the extraction function generates the extraction data by performing segmentation based on a predetermined threshold.   In the image generation function, a reference position on the first image when the first image is moved in the movement direction by the movement amount, a corresponding point on the surface of the extracted data of the reference position, The image display program according to claim 5 or 6, wherein the second image is generated based on an orthogonal vector orthogonal to the surface of the corresponding point.   The first image and the second image correspond to the object surface in two directions of x and y that define an image plane with respect to the MPR image, the slab MIP image, the curved surface MPR image, the curved surface slab MIP image, and the MPR image. MIP is performed using a deformed curved surface MPR image generated using a material having a curvature, and a material having a curvature corresponding to the object surface in two directions of x and y that define an image plane for slab data. The image display program according to any one of claims 5 to 7, wherein the image display program is any one of a deformed curved surface slab MIP image generated by the method.

Images