TW201915948A - X-ray image processing device for medical use - Google Patents

Abstract

This X-ray image processing device for medical use is provided with a determination means that determines whether a radiographic image, which has been selected by an image selection means from among multiple radiographic images acquired by an image acquisition means, is suitable as an image for use in reconstruction performed by a reconstruction means.

Description

Medical X-ray image processing device

The present invention relates to a medical X-ray image processing device, and particularly relates to a medical X-ray image processing device having a reconstruction section for reconstructing tomographic images.

Previously, a medical X-ray image processing apparatus having a reconstruction unit that reconstructs a tomographic image has been known. Such a medical X-ray image processing device is disclosed in, for example, Japanese Patent Laid-Open No. 2016-127870.

Japanese Patent Laid-Open No. 2016-127870 discloses an X-ray fluoroscopy device including an X-ray source that irradiates a subject with X-rays and a detector that detects X-rays. In the X-ray fluoroscopy device, tomosynthesis imaging for acquiring tomographic images and perspective imaging for acquiring fluoroscopic images can be performed. Specifically, when measurement is started in the X-ray fluoroscopy device, fluoroscopy imaging starts. When there is an instruction to start tomosynthesis imaging in the fluoroscopy imaging, the X-ray source and the detector relatively move to start tomosynthesis imaging. That is, during tomosynthesis imaging, fluoroscopy imaging and tomosynthesis imaging are performed in parallel. In the tomosynthesis imaging, each time the fluoroscopic image is acquired, the acquired fluoroscopic image is pre-processed, and the fluoroscopic image subjected to the pre-processing is held in the holding unit. In addition, when a predetermined number or more of fluoroscopic images are held, the pre-processed fluoroscopic images are subjected to arithmetic processing such as reconstruction processing to generate (calculate) tomographic images. In addition, tomosynthesis imaging is an imaging method that irradiates X-rays from multiple directions (angles) and shoots, and performs three-dimensional reconstruction on the collected image data.

However, in the X-ray fluoroscopy device described in Japanese Patent Laid-Open No. 2016-127870, the mechanical accuracy of the device or X-ray irradiation errors (miss) may be used to generate tomographic images (calculation ) The pre-processed perspective image contains an image that is not suitable for the generation (calculation) of the tomographic image. At this time, there is a problem that the tomographic image becomes incorrect.

The present invention is made to solve the above-mentioned problems, and one of the objects of the present invention is to provide a medical X-ray image processing apparatus capable of suppressing the tomographic image from becoming incorrect.

In order to achieve the above object, a medical X-ray image processing device according to an aspect of the present invention includes an image selection unit configured to be able to irradiate a subject from an X-ray irradiation unit and detect it by an X-ray detection unit X-rays, select the X-ray radiographic images for reconstruction of tomographic images from the multiple X-ray radiographic images obtained by the image acquisition unit that acquired the X-ray radiographic images as separate data; the reconstruction unit uses The X-ray radiographic image selected by the image selection unit reconstructs the tomographic image; and the determination unit for the X-ray radiographic image selected by the image selection unit and the image acquisition unit before the selection by the image selection unit Any one of the acquired plurality of X-ray radiographic images determines whether it is suitable as an image for reconstruction by the reconstruction unit.

In the medical X-ray image processing apparatus according to one aspect of the present invention, by having the above-described determination unit, the determination unit can determine whether the X-ray radiographic image is not suitable for reconstruction of tomographic images. As a result, it is possible to suppress that the X-ray radiographic image used for the generation (calculation) of the tomographic image contains unsuitable X-ray radiographic images. As a result, the tomographic image can be suppressed from becoming incorrect.

In the medical X-ray image processing apparatus of the above aspect, preferably, the determination unit is configured such that the object and the marker provided with X-ray absorption are provided by the X-ray irradiation unit to the subject When the phantom is irradiated with X-rays, the image of the phantom acquired by the image acquisition unit is used as a reference to determine the suitability of the image for reconstruction by the reconstruction unit. Here, when acquiring an image, in general, the position of the phantom is fixed. As a result, when imaging is performed normally, an image of the phantom is acquired at a predetermined position in the image. Therefore, by determining the suitability of the image for reconstruction by the reconstruction unit based on the image of the phantom, the image of the phantom under normal shooting conditions and the phantom under normal imaging conditions can be obtained To compare the images. This makes it easy to determine whether it is an X-ray radiographic image that is not suitable for reconstruction of tomographic images. The phantom refers to a model used for X-ray image analysis.

In this case, preferably, the determination unit is configured to determine whether the image for reconstruction by the reconstruction unit is suitable or not based on the image of the marker acquired by the image acquisition unit. Here, since the marker absorbs X-rays, the marker is reflected on the image. Moreover, the size of the marker is smaller than the size of the phantom, so it is easier to make the marker have a characteristic shape and increase the number of markers. Therefore, by determining the suitability of the image for reconstruction by the reconstruction unit based on the image of the marker, it can be determined based on the shape and number of markers, so it is easier to determine whether it is unsuitable X-ray radiographic images for reconstruction of tomographic images.

In the medical X-ray image processing device according to the aspect described above, preferably, the determination unit is configured to provide reconstruction based on the relative positional relationship of the X-ray irradiation unit with respect to the X-ray detection unit when acquiring X-ray radiographic images The unit determines whether the image for reconstruction is suitable or not. With such a configuration, when the X-ray irradiation unit does not perform X-ray irradiation from the correct position (from the correct angle), it is suppressed that the X-ray radiographic image is used for reconstruction, so the tomographic image can be suppressed Incorrect.

In this case, it is preferable that the determination unit is configured to determine whether the image to be reconstructed by the reconstruction unit is suitable or not based on the mutual symmetry of the positional relationship when acquiring each of the plurality of X-ray radiographic images. With such a configuration, in the case of acquiring (or selecting) a plurality of X-ray radiographic images in a mutually symmetrical positional relationship for image reconstruction, it can be effectively determined whether it is not suitable for reconstruction of tomographic images X-ray photography image.

In the medical X-ray image processing apparatus in which the determination unit performs determination based on the mutual symmetry of the plurality of positional relationships, preferably, the determination unit is configured to be based on the subject captured by the X-ray irradiation unit When the X-ray is irradiated on the body and the phantom provided with the X-ray absorbing marker, the X-ray irradiation angle corresponding to the positional relationship when acquiring each of the plurality of X-ray radiographic images determined from the marker image The mutual symmetry of is used to determine the suitability of the image for reconstruction by the reconstruction unit. With this configuration, the image reconstruction is performed by acquiring (or selecting) multiple X-ray radiographic images at mutually irradiated angles that are mutually symmetric by using markers to determine the symmetry of the multiple X-ray radiographic images In the case of, it can be effectively determined whether it is an X-ray radiographic image that is not suitable for reconstruction of tomographic images.

Hereinafter, an embodiment embodying the present invention will be described based on the drawings.

[First Embodiment] With reference to Figs. 1 to 4, a configuration of a medical X-ray image processing apparatus 100 according to a first embodiment will be described. In the first embodiment, a medical X-ray image processing apparatus 100 that performs tomosynthesis imaging processing by the X-ray imaging apparatus 10 will be described.

As shown in FIG. 1, the X-ray imaging apparatus 10 is provided with an X-ray irradiation unit 11, an X-ray detection unit 12 and an image processing unit 13. Furthermore, the image processing unit 13 of the X-ray imaging apparatus 10 is configured to function as the image acquisition unit 13a. In addition, the image acquisition unit 13 a is a functional block (software) in the image processing unit 13 (X-ray imaging apparatus 10). In addition, the image acquisition unit 13a is an example of an "image acquisition unit" in the scope of patent application.

The X-ray irradiation unit 11 irradiates the patient T with X-rays. The X-ray irradiation unit 11 is connected to a high-voltage generating unit (not shown), and generates X-rays by applying a high voltage. The X-ray irradiation unit 11 irradiates X-rays to the detection surface of the X-ray detection unit 12. Furthermore, a phantom 20 (described later) is arranged on the bed 14 on which the patient T is lying. When the X-ray imaging apparatus 10 performs imaging, the X-ray irradiation unit 11 irradiates both the patient T and the phantom 20 with X-rays. In addition, a plurality of (two in the first embodiment) markers 20a (described later) are provided in the phantom 20 (see FIGS. 3A to 3E). Furthermore, the marker 20a absorbs X-rays. Moreover, the marker 20a has a ball shape, for example. In addition, patient T is an example of a "subject" in the scope of patent application.

The X-ray detection unit 12 detects X-rays irradiated to the patient T from the X-ray irradiation unit 11. The X-ray detection unit 12 outputs a detection signal corresponding to the detected X-ray intensity. In addition, the X-ray detection unit 12 includes, for example, a flat panel detector (FPD).

Furthermore, the X-ray irradiation unit 11 and the X-ray detection unit 12 are each configured to be movable in the X direction. That is, in the X-ray imaging apparatus 10, it is possible to perform X-ray imaging while changing the relative positional relationship between the X-ray irradiation unit 11 and the X-ray detection unit 12. Moreover, the X-ray irradiation angle of the X-ray irradiation unit 11 also changes in accordance with the change in the relative positional relationship between the X-ray irradiation unit 11 and the X-ray detection unit 12.

By three-dimensional reconstruction of a plurality of X-ray photography images acquired by changing the relative positional relationship (X-ray irradiation angle) of the X-ray irradiation unit 11 and the X-ray detection unit 12, a subject (patient T ) A profile image of the specified location. This is called tomosynthesis photography. In addition, in tomosynthesis photography, an image reconstruction method such as a displacement addition method or a filter correction back projection method is generally used, but in the first embodiment, any method can be used.

The image acquisition unit 13 a (image processing unit 13) acquires X-ray radiographic images based on the X-rays detected by the X-ray detection unit 12 (that is, the detection signal output by the X-ray detection unit 12). Furthermore, the image acquisition unit 13 a and the medical X-ray image processing device 100 are connected via a local area network (LAN) or the like. The X-ray radiographic image acquired by the image acquisition unit 13a is transmitted to the medical X-ray image processing apparatus 100 via the LAN.

(Configuration of Medical X-ray Image Processing Device) The medical X-ray image processing device 100 is provided with a central processing unit (Central Processing Unit, CPU) 100 a. The CPU 100a is configured to function as the image selection unit 1, the reconstruction unit 2, and the determination unit 3. In addition, the image selection unit 1, the reconstruction unit 2, and the determination unit 3 are functional blocks as software in the CPU 100a (medical X-ray image processing apparatus 100), respectively. Furthermore, the image selection unit 1 and the reconstruction unit 2 are examples of the “image selection unit” and the “reconstruction unit” of the patent scope, respectively. Furthermore, the determination unit 3 is an example of a "decision unit" that applies for a patent scope.

The image selection unit 1 (CPU 100a) is configured to select from the plurality of X-ray radiographic images acquired as separate materials by the image acquisition unit 13a (image processing unit 13) for reconstruction of tomographic images X-ray photography image.

For example, as shown in FIG. 2, it is assumed that X-ray imaging images are acquired for each of the five relative positional relationships between the X-ray irradiation unit 11 and the X-ray detection unit 12. At this time, the image selection unit 1 (CPU 100a) (refer to FIG. 1) can select all or a part (for example, four) of the five X-ray radiographic images as separate materials. In addition, the selection is made automatically by a program or the like. Hereinafter, it is assumed that all of the five X-ray radiographic images acquired by the image acquisition unit 13 a (image processing unit 13) (refer to FIG. 1) are selected by the image selection unit 1. In addition, in FIG. 2, for the sake of simplicity, members other than the X-ray irradiation unit 11 and the X-ray detection unit 12 are not shown.

Here, in the first embodiment, the determination unit 3 (CPU 100a) (refer to FIG. 1) determines whether it is suitable as the reconstruction unit 2 (CPU 100a) for the X-ray radiographic image selected by the image selection unit 1 (refer to Figure 1) Image for reconstruction. Specifically, the determination unit 3 uses the image of the phantom 20 (acquired by the image acquisition unit 13 a) in the X-ray radiographic image selected by the image selection unit 1 as a reference, and provides the reconstruction unit 2 The suitability of the reconstructed image is determined. In detail, the determination unit 3 uses the image of the marker 20a (obtained by the image acquisition unit 13a) in the X-ray radiographic image selected by the image selection unit 1 as a reference The suitability of the reconstructed image is determined.

In more detail, as shown in FIGS. 3A to 3E, it is assumed that there are X-rays that did not capture the marker 20a among the five X-ray radiographic images selected by the image selection unit 1 (CPU 100a) (see FIG. 1) Photographic images (see Figure 3D). At this time, the determination unit 3 determines that the X-ray radiographic image (see FIG. 3D) where the marker 20 a has not been captured is not suitable as an image for reconstruction by the reconstruction unit 2. In the case of normal imaging, the marker 20a will be photographed in the X-ray radiographic image. On the other hand, when the marker 20a is not photographed, it is considered that the X-ray irradiation angle is abnormal or the X-ray dose Abnormality and other reasons, so there is such a judgment standard. In addition, even if one of the plurality of markers 20a is not photographed, it is determined that it is not suitable as an image for reconstruction, or when all the markers 20a are not photographed, it is determined that it is not suitable for reconstruction. Used images. In addition, for the detection of the marker 20a in the X-ray radiographic image, for example, binary processing or the like is used.

The reconstruction unit 2 (CPU 100a) (refer to FIG. 1) reconstructs the tomographic image using the X-ray radiographic image selected by the image selection unit 1. Specifically, the reconstruction unit 2 uses the image determined by the determination unit 3 (CPU 100a) (see FIG. 1) among the X-ray radiographic images selected by the image selection unit 1 to be suitable for reconstruction by the reconstruction unit 2. X-ray radiographic images (refer to FIGS. 3A to 3C and 3E) to reconstruct tomographic images.

(Method of acquiring tomographic images) Next, referring to FIG. 4, a method of acquiring tomographic images of the medical X-ray image processing apparatus 100 of the first embodiment will be described.

First, in step S1, the X-ray imaging image is acquired by the image acquisition unit 13a (image processing unit 13) (see FIG. 1) of the X-ray imaging apparatus 10.

Next, in step S2, all of the five X-ray radiographic images acquired in step S1 are selected by the image selection unit 1 (CPU 100a) (refer to FIG. 1).

Next, in step S3, the determination unit 3 determines whether the marker 20a has been captured in all the five X-ray radiographic images selected in step S2 (see FIGS. 3A to 3E). When the marker 20a is captured in all X-ray radiographic images, the process proceeds to step S4. Even if there is an X-ray radiographic image in which the marker 20a is not captured, the process returns to step S2. When returning to step S2, it is possible to control so as not to select the X-ray radiographic image in which the marker 20a has not been captured.

Next, in step S4, reconstruction is performed using the X-ray radiographic image determined to be suitable for reconstruction in step S3. In step S5, the tomographic image obtained by reconstruction is displayed on a monitor or the like.

(Effects of the first embodiment) In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, the medical X-ray image processing apparatus 100 is configured in such a manner as to include the image selection unit 1 configured to be acquired by the image acquisition unit 13a. Among the X-ray radiographic images as separate data, select X-ray radiographic images for reconstruction of tomographic images; and the determination unit 3 determines whether the X-ray radiographic images selected by the image selection unit 1 are suitable as reconstruction units 2 Image for reconstruction. Thus, by having the determination unit 3, the determination unit 3 can determine whether it is an X-ray radiographic image that is not suitable for reconstruction of a tomographic image. As a result, it can be suppressed that the X-ray radiographic image used for the generation (calculation) of the tomographic image contains unsuitable X-ray radiographic images. Thus, it is possible to suppress the tomographic image from becoming incorrect.

Moreover, in the first embodiment, as described above, the medical X-ray image processing apparatus 100 is configured in such a manner that the determination unit 3 is configured to absorb the subject and the absorption X by the X-ray irradiation unit 11. When the phantom 20 of the ray marker 20a is irradiated with X-rays, the image of the phantom 20 acquired by the image acquisition unit 13a is used as a reference, and the suitability of the image for reconstruction by the reconstruction unit 2 is determined. Here, at the time of image acquisition, the position of the phantom 20 is generally fixed. As a result, when imaging is performed normally, an image of the phantom 20 is acquired at a predetermined position in the image. Therefore, by determining the suitability of the image for reconstruction by the reconstruction unit 2 based on the image of the phantom 20, the image of the phantom 20 obtained under normal shooting conditions and the case where normal imaging is not obtained can be determined Compare the images of the phantom 20. This makes it easy to determine whether it is an X-ray radiographic image that is not suitable for reconstruction of tomographic images.

Furthermore, in the first embodiment, as described above, the medical X-ray image processing apparatus 100 is configured such that the determination unit 3 uses the image of the marker 20a acquired by the image acquisition unit 13a as The criterion determines whether the image for reconstruction by the reconstruction unit 2 is suitable or not. Here, since the marker 20a absorbs X-rays, the marker 20a is reflected on the image. Moreover, the size of the marker 20a is smaller than the size of the phantom 20, so it is relatively easy to make the marker 20a have a characteristic shape and increase the number of markers 20a. Therefore, by determining the suitability of the image for reconstruction by the reconstruction unit 2 based on the image of the marker 20a, the determination can be made based on the shape and number of the marker 20a, so it can be determined more easily Whether it is an X-ray radiographic image unsuitable for tomographic reconstruction.

[Second Embodiment] Next, the configuration of a medical X-ray image processing apparatus 200 according to a second embodiment will be described with reference to FIGS. 1, 5A to 5E, and FIG. 6. The medical X-ray image processing apparatus 200 of the second embodiment described above differs from the first embodiment in that it is based on whether or not the marker 20a is captured in an X-ray radiographic image and is based on image acquisition. The relative positional relationship (X-ray irradiation angle) of the X-ray irradiation unit 11 and the X-ray detection unit 12 is used for determination. In addition, the same configuration as that of the above-described first embodiment is denoted by the same reference numeral as that of the first embodiment, and the description is omitted.

(Configuration of medical X-ray image processing apparatus) As shown in FIG. 1, a CPU 200 a is provided in the medical X-ray image processing apparatus 200. The CPU 200a is configured to function as the determination unit 23. In addition, the determination unit 23 is a functional block that is software in the medical X-ray image processing apparatus 200. Furthermore, the determination unit 23 is an example of a "decision unit" that applies for a patent scope.

Here, in the second embodiment, as shown in FIGS. 5A to 5E, the determination unit 23 (CPU 200a) (refer to FIG. 1) is configured based on the X-ray irradiation unit 11 (refer to FIG. 1) when acquiring an X-ray radiographic image ) With respect to the relative positional relationship of the X-ray detection unit 12 (see FIG. 1), the suitability of the image for reconstruction by the reconstruction unit 2 (CPU 200a) (see FIG. 1) is determined. Specifically, the determination unit 23 is configured based on the acquisition of a plurality of (five in the second embodiment) X-ray radiographic images selected by the image selection unit 1 (CPU 200a) (refer to FIG. 1). The mutual symmetry of the relative positional relationship between the X-ray irradiation unit 11 and the X-ray detection unit 12 at that time determines whether the image to be reconstructed by the reconstruction unit 2 is suitable or not.

In detail, the determination unit 23 determines (calculates) the X-ray irradiation unit 11 with respect to X from the image of the marker 20a captured in the X-ray radiographic images of FIGS. 5A to 5E selected by the image selection unit 1. The X-ray irradiation angle corresponding to the relative positional relationship of the radiation detector 12. That is, the determination unit 23 determines (calculates) the X-ray irradiation corresponding to the relative positional relationship between the X-ray irradiation unit 11 and the X-ray detection unit 12 based on the positional relationship of the two markers 20a captured in the X-ray radiographic image angle.

For example, as shown in p1 to p5 of FIG. 6, the X-ray irradiation angle is changed to -40 degrees (refer to p1 in FIG. 6), -20 degrees (refer to p2 in FIG. 6), and 0 degrees (refer to p3 in FIG. 6) ), 20 degrees (refer to p4 in FIG. 6), 40 degrees (refer to p5 in FIG. 6), and acquire X-ray radiographic images at each irradiation angle. At this time, as the irradiation angle of the X-rays from the X-ray irradiation unit 11 with respect to the X-ray detection unit 12 changes, the irradiation angle of the X-rays with respect to the marker 20a also changes. As a result, the positional relationship between the two markers 20a captured in the X-ray radiographic image will also change. In addition, the X-ray radiographic images of FIGS. 5A to 5E are X-ray radiographic images acquired at the X-ray irradiation angles shown in p1 to p5 of FIG. 6, respectively. In addition, the images of the marker 20a of FIGS. 5A to 5E and the marker 20a of FIG. 6 are rough representations, and the positional change of the marker 20a according to the angle may be different from the actual one.

The X-ray irradiation angles obtained when the X-ray radiographic images of FIGS. 5A to 5E are determined (calculated) from the positions of the two markers 20a (the angle of the line connecting the two markers 20a, etc.) are − 40 degrees, -20 degrees, 0 degrees, 20 degrees, 40 degrees. At this time, the determination unit 23 determines that the five X-ray imaging images have symmetry. Further, for example, if the X-ray irradiation angles when acquiring the X-ray radiographic images of FIGS. 5A to 5E are -40 degrees, -20 degrees, 0 degrees, 10 degrees, and 40 degrees, the determination unit 23 determines that There is no symmetry in the five radiographic images. That is, since the X-ray radiographic image including the X-ray irradiation angle of 10 degrees is included, the determination unit 23 determines that there is no symmetry. In addition, the determination criterion of symmetry can be set arbitrarily.

(Method of acquiring tomographic images) Next, referring to FIG. 7, a method of acquiring tomographic images of the medical X-ray image processing apparatus 200 of the second embodiment will be described.

First, in step S11, the X-ray imaging image is acquired by the image acquisition unit 13a (image processing unit 13) of the X-ray imaging apparatus 10 (refer to FIG. 1).

Next, in step S12, all of the five X-ray imaging images acquired in step S11 are selected by the image selection unit 1 (CPU 200a) (refer to FIG. 1).

Next, in step S13, the determination unit 23 (CPU 200a) (refer to FIG. 1) determines whether there is symmetry of the X-ray irradiation angle among the five X-ray radiographic images selected in step S12. When there is symmetry among the five X-ray radiographic images, the process proceeds to step S14. When there is no symmetry among the five X-ray radiographic images, the process returns to step S12. When returning to step S12, it is possible to perform control so as not to select the X-ray radiographic image that is determined to have no symmetry.

Next, in step S14, a plurality of X-ray radiographic images determined to have symmetry in step S13 are used for reconstruction. Then, in step S15, the tomographic image obtained by reconstruction is displayed on a monitor or the like.

The other structure of the second embodiment is the same as that of the first embodiment.

(Effects of the second embodiment) In the second embodiment, the following effects can be obtained.

In the second embodiment, as described above, the medical X-ray image processing apparatus 200 is configured in such a manner that the determination unit 23 is based on the X-ray irradiation unit 11 when acquiring the X-ray radiographic image with respect to the X-ray detection unit. The relative positional relationship of 12 determines whether the image for reconstruction by the reconstruction unit 2 is suitable or not. As a result, when the X-ray irradiation unit 11 does not perform X-ray irradiation from the correct position (from the correct angle), it is suppressed that the X-ray radiographic image is used for reconstruction, so the tomographic image can be suppressed correct.

Moreover, in the second embodiment, as described above, the medical X-ray image processing apparatus 200 is configured in such a manner that the determination unit 23 is based on mutual symmetry of the positional relationship when each of the plurality of X-ray imaging images is acquired To determine whether the image for reconstruction by the reconstruction unit 2 is suitable or not. Thereby, in the case of acquiring (or selecting) a plurality of X-ray radiographic images in a mutually symmetrical positional relationship and reconstructing the image, it is possible to effectively determine whether it is an X-ray unsuitable for tomographic reconstruction Photographic image.

Furthermore, in the second embodiment, as described above, the medical X-ray image processing device 200 is configured in such a manner that the determination unit 23 is based on the X-ray irradiation unit 11 for absorbing X-rays to the patient T and When the phantom 20 of the marker 20a is irradiated with X-rays, the mutual symmetry of the X-ray irradiation angles corresponding to the positional relationship when acquiring each of the plurality of X-ray radiographic images determined from the image of the marker 20a is determined, The suitability of the image for reconstruction by the reconstruction unit 2 is determined. Thus, by using marker 20a to determine the symmetry of a plurality of X-ray imaging images to obtain (or select) a plurality of X-ray imaging images at mutually symmetrical irradiation angles for image reconstruction In this case, it can be effectively determined whether it is an X-ray radiographic image that is not suitable for reconstruction of a tomographic image.

In addition, the other effects of the second embodiment are the same as those of the first embodiment.

[Modifications] In addition, it should be considered that the previously disclosed embodiments are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the scope of patent application rather than the description of the above-mentioned embodiments, and includes all modifications (modifications) within the meaning and scope equivalent to the scope of patent application.

For example, in the first embodiment and the second embodiment, an example of performing tomosynthesis photography is illustrated, but the present invention is not limited to this. For example, computed tomography (CT) photography can also be performed.

Furthermore, in the first embodiment and the second embodiment, an example in which two markers are provided on the phantom is illustrated, but the present invention is not limited to this. For example, one or more than three markers may be provided on the phantom.

Furthermore, in the first embodiment and the second embodiment, the example in which the marker has a spherical shape is exemplified, but the present invention is not limited to this. For example, the marker may have a shape other than a ball shape (for example, a stick shape).

Furthermore, in the first embodiment and the second embodiment, an example in which the X-ray irradiation unit and the X-ray detection unit are respectively movable is illustrated, but the present invention is not limited to this. For example, any one of the X-ray irradiation unit and the X-ray detection unit may be movable.

Furthermore, in the first embodiment and the second embodiment, an example in which the relative positional relationship between the X-ray irradiation unit and the X-ray detection unit is changed by moving one X-ray irradiation unit is illustrated. However, the present invention does not Not limited to this. For example, a plurality of fixed X-ray irradiation units may be arranged, and the relative positional relationship between the X-ray irradiation unit and the X-ray detection unit may be changed by changing the X-ray irradiation unit that irradiates X-rays.

Furthermore, in the first embodiment and the second embodiment, an example in which X-ray imaging images are acquired in each of the five relative positional relationships between the X-ray irradiation unit and the X-ray detection unit is illustrated. The invention is not limited to this. For example, four or less or six or more X-ray radiographic images may be acquired by changing the relative positional relationship between the X-ray irradiation unit and the X-ray detection unit.

In addition, in the first embodiment described above, an example of determining whether it is suitable as an image for reconstruction based on a phantom and a marker is illustrated, but the present invention is not limited to this. For example, it is possible to determine whether it is suitable as an image for reconstruction based on the image quality (luminance value, etc.) of the X-ray radiography image without using phantoms and markers. Furthermore, the determination may be based on other determination criteria.

Furthermore, in the second embodiment, an example in which the X-ray irradiation angle is determined based on the marker (phantom) is illustrated, but the present invention is not limited to this. For example, the X-ray imaging device may have X-ray irradiation angle information at the time of X-ray irradiation. At this time, the information may be associated with the acquired X-ray radiographic image in advance, and the symmetry of the X-ray irradiation angle corresponding to the selected X-ray radiographic image may be determined based on the information.

Furthermore, in the first embodiment and the second embodiment, all the X acquired by the image acquisition unit (image acquisition unit 13a) are selected by the image selection unit (image selection unit 1). Examples of radiographic images, but the invention is not limited to this. For example, a part of the X-ray radiographic images acquired by the image acquisition unit (image acquisition unit 13a) may be selected by the image selection unit (image selection unit 1). At this time, in the next image selection when the determination unit (determination unit 3 (23)) determines that it is bad (no good, NG), X that was not selected in the previous image selection may be selected. Radiographic image.

Furthermore, in the first embodiment described above, in the case where there is an X-ray radiographic image judged to be unsuitable for reconstruction, the image selection unit (image selection unit 1) performs image reselection. Examples, but the invention is not limited to this. For example, when a part of the plurality of X-ray radiographic images selected by the image selection unit (image selection unit 1) is determined to be OK by the determination unit (determination unit 3), it is no longer necessary The image selection unit (image selection unit 1) performs the reselection and reconstructs the X-ray radiographic image determined to be OK.

Furthermore, in the first embodiment, an example in which the determination unit (determination unit 3) makes the determination based on whether the marker is captured in the X-ray radiographic image is exemplified, but the present invention is not limited to this. For example, when a part of the marker in the X-ray radiographic image is not captured or the image of the marker is not clear, it may be determined that it is not suitable as an image for reconstruction.

Furthermore, in the first embodiment, an example in which the determination unit (determination unit 3) makes the determination based on whether the marker is captured in the X-ray radiographic image is exemplified, but the present invention is not limited to this. For example, the determination unit (determination unit 3) may perform the determination based on whether the phantom is captured. Furthermore, when a part of the phantom is not captured in the X-ray radiographic image or the image of the phantom is not clear, it may be determined that it is not suitable as an image for reconstruction.

Furthermore, in the first embodiment and the second embodiment, it is exemplified that the X-rays determined by the determination unit (the determination unit 3 (23)) as unsuitable as images for reconstruction are not selected in the next image selection. Examples of photographic images, but the invention is not limited to this. For example, it may not be necessary to perform X-ray radiographic images determined by the determination unit (determination unit 3 (23)) as unsuitable as reconstruction images (in the second embodiment, the image is determined to be unsuitable for reconstruction. Image X-ray image) corresponding to the conditions (the conditions of the relative position and the irradiation angle) image acquisition. Furthermore, the X-ray radiographic image acquired again may be selected by the image selection unit (image selection unit 1) and determined by the determination unit (determination unit 3 (23)). This makes it possible to suppress the subject (patient T) from being exploded by X-rays due to the reacquisition (recapture) compared to the case where all X-ray radiographic images are reacquired.

Furthermore, in the first and second embodiments, the X-ray radiographic image selected by the image selection unit (image selection unit 1) is performed by the determination unit (determination unit 3 (23)). Examples of determination, but the invention is not limited to this. For example, a plurality of X-ray radiographic images acquired by the image acquisition unit (image acquisition unit 13a) before selection by the image selection unit (image selection unit 1) may be determined by the determination unit (determination The unit 3 (23)) makes a determination, and from the X-ray radiographic image determined by the determination unit (the determination unit 3 (23)) as an image suitable for reconstruction, the image selection unit (the image selection unit) 1) Make a selection.

In the first and second embodiments, the medical X-ray image processing apparatus does not include an image acquisition unit (image acquisition unit 13a). However, the present invention is not Limited to this. As shown in FIG. 8, the medical X-ray image processing device 300 may be provided with an image acquisition unit 13a. Specifically, the medical X-ray image processing device 300 is provided with a CPU 300a. The CPU 300a is configured to function as the image acquisition unit 13a. At this time, the image acquisition unit 13a is a functional block as software in the CPU 300a (medical X-ray image processing apparatus 300). Furthermore, the image acquisition unit 13a acquires X-ray imaging images based on the detection signal output by the X-ray detection unit 12 of the X-ray imaging device 30. At this time, the medical X-ray image processing device 300 is included in the X-ray imaging device 30.

Furthermore, in the first embodiment described above, an example in which a plurality of X-ray radiographic images are selected by the image selection unit (image selection unit 1) is illustrated, but the present invention is not limited to this. For example, one X-ray imaging image may be selected by the image selection unit (image selection unit 1).

Furthermore, in the second embodiment, an example in which the determination is made based on the mutual symmetry of the X-ray irradiation angle when acquiring each of a plurality of X-ray radiographic images is illustrated, but the present invention is not limited to this. For example, the determination may be based on the mutual symmetry of the relative positional relationship of the X-ray irradiation unit with respect to the X-ray detection unit. Specifically, it can also be determined based on the mutual symmetry of the distance in the X direction (see FIG. 2) between the X-ray irradiation unit 11 and the X-ray detection unit 12 when each of a plurality of X-ray imaging images is acquired. .

Furthermore, in the second embodiment, an example in which the irradiation angles of X-rays when acquiring each of a plurality of X-ray radiographic images are symmetrical to each other has been exemplified. The invention is not limited to this. For example, even if the X-ray irradiation angles corresponding to each of a plurality of X-ray imaging images are acquired, they are asymmetrical, but satisfy a predetermined condition (for example, the angle difference between each other is about 10 degrees) In this case, it is determined to be suitable as an image for reconstruction.

Furthermore, in the first and second embodiments, the example in which the selection by the image selection unit (image selection unit 1) is automatically performed by a program or the like is illustrated, but the present invention is not limited to this. For example, the selection can also be made by the user.

Furthermore, in the first embodiment and the second embodiment, for convenience of description, the flow of control is described using a "flow-driven flow chart", but the present invention is not limited to this . It can also be performed by "event-driven type" that performs control processing in event units. In this case, it can be performed not only as a complete event-driven type, but also as a combination of event-driven and flow-driven.

1‧‧‧Image selection unit

2‧‧‧ Reconstruction Unit

3.23‧‧‧Judgment unit

10.30‧‧‧X-ray photography device

11‧‧‧X-ray irradiation department

12‧‧‧X-ray inspection department

13‧‧‧Image Processing Department

13a‧‧‧Image acquisition unit

14‧‧‧bed

20‧‧‧ Phantom

20a‧‧‧marker

100, 200, 300 ‧‧‧ medical X-ray image processing device

100a, 200a, 300a‧‧‧‧CPU

p1 ～ p5‧‧‧irradiation angle

S1 ～ S5 、 S11 ～ S15‧‧‧‧Step

T‧‧‧Patient

X‧‧‧ray

FIG. 1 is a diagram showing the configuration of a medical X-ray image processing apparatus and an X-ray imaging apparatus according to the first embodiment and the second embodiment. 2 is a diagram for explaining the relative positional relationship between the X-ray irradiation unit and the X-ray detection unit during X-ray irradiation in the first embodiment and the second embodiment. FIG. 3A is an X-ray radiographic image selected by the image selection unit of the medical X-ray image processing apparatus according to the first embodiment. 3B is an X-ray radiographic image when X-rays are irradiated at an irradiation angle different from FIG. 3A among the X-ray radiographic images selected by the image selection unit. 3C is an X-ray radiographic image when X-rays are irradiated at an irradiation angle different from that of FIGS. 3A and 3B among the X-ray radiographic images selected by the image selection unit. FIG. 3D is an X-ray radiographic image when X-rays are irradiated at an irradiation angle different from FIGS. 3A to 3C among the X-ray radiographic images selected by the image selection unit. FIG. 3E is an X-ray radiographic image when X-rays are irradiated at an irradiation angle different from FIGS. 3A to 3D among the X-ray radiographic images selected by the image selection unit. 4 is a flowchart for explaining a method of acquiring a tomographic image using the medical X-ray image processing apparatus according to the first embodiment. 5A is an X-ray radiographic image selected by the image selection unit of the medical X-ray image processing device of the second embodiment. 5B is an X-ray radiographic image when X-rays are irradiated at an irradiation angle different from FIG. 5A among the X-ray radiographic images selected by the image selection unit. 5C is an X-ray radiographic image when X-rays are irradiated at an irradiation angle different from that of FIGS. 5A and 5B among the X-ray radiographic images selected by the image selection unit. FIG. 5D is an X-ray radiographic image when X-rays are irradiated at an irradiation angle different from FIGS. 5A to 5C among the X-ray radiographic images selected by the image selection unit. 5E is an X-ray radiographic image when X-rays are irradiated at an irradiation angle different from that of FIGS. 5A to 5D among the X-ray radiographic images selected by the image selection unit. FIG. 6 is a diagram for explaining the irradiation (angle) of X-rays to a marker according to the second embodiment. 7 is a flowchart for explaining a method of acquiring a tomographic image using the medical X-ray image processing apparatus according to the second embodiment. 8 is a diagram showing the configuration of a medical X-ray image processing apparatus and an X-ray imaging apparatus according to a modification of the first embodiment and the second embodiment.

Claims (6)

A medical X-ray image processing device includes: an image selection unit configured to be capable of acquiring X-rays based on X-rays irradiated to an object from an X-ray irradiation unit and detected by an X-ray detection unit Among the plurality of X-ray radiographic images obtained as the individual data obtained by the image acquisition unit of the radiographic image, select the X-ray radiographic image for reconstruction of the tomographic image; the reconstruction unit uses the image selection unit The selected X-ray radiographic image reconstructs the tomographic image; and a determination unit for the X-ray radiographic image selected by the image selection unit and before selection by the image selection unit Any one of the plurality of X-ray radiographic images acquired by the image acquisition unit determines whether it is suitable as an image for reconstruction by the reconstruction unit. The medical X-ray image processing device according to item 1 of the patent application scope, wherein the determination unit is configured such that the X-ray irradiation unit is provided to the subject and the device to absorb X-rays When the phantom of the marker is irradiated with X-rays, the image of the phantom acquired by the image acquisition unit is used as a reference to determine the suitability of the image for reconstruction by the reconstruction unit. The medical X-ray image processing device according to item 2 of the patent application scope, wherein the determination unit is configured to take the image of the marker acquired by the image acquisition unit as a reference, The suitability of the image for reconstruction by the reconstruction unit is determined. The medical X-ray image processing device according to any one of claims 1 to 3, wherein the determination unit is configured based on the X-ray irradiation when acquiring the X-ray radiographic image The relative positional relationship of the unit with respect to the X-ray detection unit determines whether the image to be reconstructed by the reconstruction unit is suitable or not. The medical X-ray image processing device according to Item 4 of the patent application range, wherein the determination unit is configured to be symmetrical to each other based on the positional relationship when acquiring each of the plurality of X-ray radiographic images To determine the suitability of the image for reconstruction by the reconstruction unit. The medical X-ray image processing device according to item 5 of the patent application range, wherein the determination unit is configured to be based on the X-ray irradiation unit for absorbing X-rays to the subject and the device When the phantom of the marker is irradiated with X-rays, the irradiation angle of the X-ray corresponding to the positional relationship when acquiring each of the plurality of X-ray radiographic images determined from the image of the marker Mutual symmetry to determine the suitability of the image for reconstruction by the reconstruction unit.