JP4474140B2 - Image display device - Google Patents

Description

  The present invention relates to a method and an apparatus for assisting partial transplantation of an organ in a living body, and more particularly to a simulation apparatus for assisting a doctor when a doctor diagnoses or treats an organ such as a liver in clinical practice. is there.

Conventionally, as described in [Patent Document 1], a region of interest extraction process is performed on the read stacked three-dimensional image data, and a region of interest (portal vein, liver parenchyma) is extracted. A distance value conversion process is performed on the extracted portal vein, and a thinning process or a surface image detection process is further performed. Using the processing results of the distance value conversion process and the thinning process or the surface image detection process, the dominant region specifying process in which the portal vein is controlled in the liver parenchyma is performed. A designated extraction process that identifies a portal vein branch that identifies an ablation region of the portal vein is performed, and an ablation process that identifies an ablation region defined by the designated extraction process is performed. As a result, it is possible to extract and display an organ specific region suitable for organ treatment simulation using a three-dimensional original image in which a plurality of tomographic images are stacked.
JP 2001-283191 A

  However, in the above prior art, since it is performed by designating the excision position of one kind of blood vessel, when it is necessary to specify the region to be excised with a plurality of blood vessel branches, there are many methods for specifying those blood vessel branches. Therefore, a complicated operation that requires a trial operation is required.

  An object of the present invention is to provide an image display device capable of efficiently performing a blood vessel specifying operation necessary for determining an ablation region.

The object is to display a subject image obtained by the medical image diagnostic apparatus, a means for setting an organ position in the displayed image, and a control corresponding to the set organ position. A means for extracting blood vessels; and an explicit means for clearly displaying to the display means display information of at least one of the display luminance or color of the extracted dominant blood vessels different from the display information of other positions of the organ. Is achieved.

  According to the present invention, there is an effect that it is possible to efficiently perform the blood vessel specifying operation necessary for determining the resection area.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment of the invention, and the repetitive description thereof is omitted.
In addition, here, a procedure for specifying a liver region using an X-ray CT image obtained by contrast-enhanced imaging of the liver as a processing target image, and using arterial and venous travel information, and a liver excision region using the procedure A method for displaying is described below.

  As shown in Fig. 1 (a), a plurality of tomographic images 11 obtained by an image diagnostic apparatus capable of three-dimensional measurement such as an X-ray CT apparatus and an MRI apparatus are stacked, and the stacked tertiary as shown in Fig. 1 (b) The original image 12 is used, and the processing target is three-dimensional. The stacked three-dimensional image 12 includes liver tissue, arteries, veins, tumors, and the like, and is displayed on a monitor, for example, as a pseudo three-dimensional image that is shaded and projected on a two-dimensional projection surface (not shown).

  FIG. 2 is a diagram for explaining an example of an algorithm for displaying a resected region of the liver. In order to simplify the explanation, it is shown as a plan view. For example, whether or not the organ pixel 20 is included in the dominant region of the branches 22 and 26 of the vessels 21 and 25 as an ablation region until the dominant region can be specified by specifying the ligation positions 23 and 27 of the respective vessels Cannot judge. In this example, the pixel 20 is not included in the dominating region 24 at the ligation position 23 of the branch 22 of the vessel 21, but as shown in FIG. 3, the vessel is ligated at the position 27 by being included in the region 24. It is included in the control region 31 of the 25 branches 26.

  Therefore, as shown in FIG. 4, when the branch 22 of the artery 21 is excised from the location 23, if the branch 26 of the vein 25 is included in the excision region, the vein 26 must be excised from the position 27, and finally The necessary ablation region needs to be a region obtained by adding the region 24 controlled by the artery 22 and the region 31 controlled by the vein 26. That is, here, it is found that the pixel 20 is a pixel to be removed. Furthermore, in this case, it can be seen that the vessels actually involved in the pixel 20 are 25 branches 26 and 21 other branches 32.

  Therefore, as shown in FIG. 5, an arbitrary cross-sectional image of an organ or a three-dimensional image 50 is used to specify an arbitrary organ position (pixel) 51 or 54, and a pulse defined to dominate the organ pixel 51 or 54. By showing the tubes (or vascular positions) 52, 53, 55, and 56 on the already extracted three-dimensional vascular image and in arbitrary cross-sectional images, the dominant vasculature at the specified organ position can be estimated and specified. It becomes easy. For example, it can be seen that when the organ regions 51 and 54 are excised, the branch 22 of the vessel 21 is mainly involved. Each of them is also involved in the branch of the other vessel 25, and when the branch 22 is ligated, for example, when the ligation of the branch 26 is also required, it is indicated that it is necessary to confirm the control region of the branch 26 It becomes possible. The present technique also makes it possible to effectively present a vascular site that dominates an arbitrary position of an organ in a complex traveling vessel.

FIG. 6 is a flowchart showing a control blood vessel specifying process in the organ control blood vessel presentation device of the present invention. The blood vessel specifying process 60 of the present invention includes a region of interest extracting process 61, a distance value converting process 62, a thinning process 63 or a surface pixel detecting process 64, a dominating area control process specifying an organ by a vessel 65, and an arbitrary position of the organ Processing 66, and vascular identification processing 67 that controls the designated organ position. Here, the processes 62 to 65 are performed on all the extracted vessels.
The region-of-interest extraction processing 61 to the surface pixel detection processing 65 performed on the read stacked three-dimensional image data are performed by the same method as in Japanese Patent Laid-Open No. 2001-283191.

  As shown in FIG. 5, in processing 66, an organ component pixel is specified using an arbitrary cross-sectional image of an organ, a three-dimensional image 50, or the like, and an artery or blood vessel that is determined to control the organ position is specified. A process and a process 66 for identifying a vein determined to dominate the organ position are performed. The specified blood vessel information is displayed by coloring or the like in the extracted three-dimensional image of the vessel or an arbitrary cross-sectional image in the stacked three-dimensional image. Further, the display information of at least one of the display brightness and color of the dominant blood vessel may be displayed differently from the display information of other organs.

With the device of the present invention, these results can be selectively displayed in a three-dimensional image or an arbitrary cross-sectional image, and are involved in dominance using the vascular core line displayed as a three-dimensional image. It is possible to explicitly display the vascular site to be performed.
Further, it is possible to display the dominant region by the same method as that of JP 2001-283191 A using the information on the blood vessel position specified by this processing.

  FIG. 7 shows a configuration diagram of an example of hardware capable of realizing the system of the present invention. This system includes a CPU 72, a main memory 70, a magnetic disk 71, a display memory 73, a display 74, a controller 75, a mouse 76, a keyboard 77, and a common bus 78. Each tomographic image is stored in the magnetic disk 71, and the CPU 72 performs predetermined processing according to the projection display software in the main memory 70. In this processing, input / output processing and processing operations are performed using the mouse 76 and keyboard 77 attached to the controller 75. The stacked three-dimensional images and processing results are displayed on the display 74 via the display memory 73, and the processing shown in FIG. 2 is performed using the operation of the operator, and images that meet various conditions are displayed. The processing result and display contents are stored in the magnetic disk 71 and used for redisplay.

  Although the embodiments of the present invention have been described above, the method of the present invention is applicable not only to X-ray CT apparatuses but also to images acquired by other image diagnostic apparatuses such as magnetic resonance imaging apparatuses and ultrasonic diagnostic apparatuses. Can be used. In addition to the liver described in the above embodiment, the target organ can be applied to many parts of the human body.

  According to the organ-dominated blood vessel presentation method and apparatus of the present embodiment, even in an organ containing a complicatedly running blood vessel, by specifying the position of the organ, the blood vessel involved in organ control at the designated position can be easily obtained. It is possible to specify. In other words, in the previous methods, the dominant region of the organ was identified by specifying the vessel first, but the reverse approach of specifying the dominant blood vessel from the organ position considered intuitively is possible. is there.

  As a result, an approach from both directions of the organ and the vascular can be made when the dominant region of the organ and the blood vessel related thereto are specified for the organ including the complexly running vascular.

The figure which shows the relationship between a tomogram and data. The figure explaining the example of an algorithm which displays the excision area | region of a liver. FIG. 3 is a diagram for explaining a dominant region in FIG. FIG. 3 is a diagram for explaining an example in which it is difficult to draw the excision region with the algorithm of FIG. The figure explaining the dominant blood vessel identification procedure by simulation. The flowchart explaining the outline | summary of the processing method of this invention. The figure which shows the hardware structural example which can implement this invention.

Claims (2)

Means for displaying an image of a subject obtained by the medical image diagnostic apparatus;
Means for acquiring a designated position in an organ of the displayed image;
First dominant blood vessel extraction means for extracting a first dominant blood vessel corresponding to the acquired organ position;
A first dominant region extracting means for extracting a first dominant region controlled by the first dominant blood vessel;
A second dominant blood vessel extracting means for extracting a second dominant blood vessel included in the first dominant region;
Explicit means for clearly displaying to the display means the display information of at least one of the display luminance or color of the first dominant blood vessel and the second dominant blood vessel is different from the display information of the other position of the organ. An image display device characterized by the above. The image display apparatus according to claim 1, wherein the specifying unit specifies an excision region of the organ based on a first dominant blood vessel and a second dominant blood vessel .

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