JP7418198B2 - Image processing device, image processing system, image processing method and program - Google Patents

Description

The present invention relates to an image processing apparatus, an image processing system, an image processing method, and a program for processing medical images.

Due to problems such as the size of the radiation detector and the positioning of the subject, the subject may be photographed obliquely with respect to the radiation detector. In this case, during image diagnosis, the image is rotated and displayed on the display device so that the subject is straight, for example, in the horizontal or vertical direction in the image. Patent Document 1 describes a method of rotating an image by pressing a button using an input device.

Further, Patent Document 2 describes a method of rotating an image by flicking a touch panel with a finger or a touch pen.

JP2016-072725A Japanese Patent Application Publication No. 2014-052817

However, with the techniques disclosed in Patent Documents 1 and 2, the operator needs to rotate the image by operating an input device such as dragging or pressing a button while checking the image. This may increase the operational burden to adjust to the

The present invention has been made in view of the above problems, and an object of the present invention is to provide an image processing technique that can reduce the burden on the operator.

In order to achieve the object of the present invention, an image processing apparatus according to one aspect of the present invention is an image processing apparatus that processes images obtained by radiography, and includes:
a reference point determining means for determining a reference point that is a rotation center of the image based on a determination as to whether an irradiation field region exists in the image ;
of the image based on the angle formed between a reference line connecting an arbitrary specified point in the image specified according to an operation by the operator and the reference point, and a line passing through the reference point. a rotation angle determining means for determining a rotation angle;
The image processing apparatus is characterized by comprising a rotation processing means for performing rotation processing of the image based on the rotation angle.

According to the present invention, it is possible to provide an image processing technique that can rotate an image to a desired rotation angle with fewer operations than before, and can reduce the burden on the operator.

The accompanying drawings are included in and constitute a part of the specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention.
FIG. 1 is a diagram illustrating a configuration example of a radiation imaging system according to a first embodiment. FIG. 3 is a diagram illustrating the flow of photographing processing in the first embodiment. FIG. 3 is a diagram illustrating the flow of image processing related to image rotation in the first embodiment. FIG. 6 is a diagram illustrating processing of a rotation angle determination unit in the first embodiment. FIG. 3 is a schematic diagram of a display unit displaying an image before image processing related to image rotation is performed in the first embodiment. FIG. 3 is a schematic diagram of a display unit displaying an image after image processing related to image rotation in the first embodiment. FIG. 7 is a diagram illustrating the flow of image processing related to image rotation in the second embodiment. FIG. 7 is a schematic diagram of a display unit displaying an image before image processing related to image rotation is performed in the second embodiment. FIG. 7 is a schematic diagram of a display unit displaying an image after image processing related to image rotation in the second embodiment. FIG. 7 is a diagram illustrating the flow of image processing related to image rotation in the third embodiment. FIG. 7 is a schematic diagram of a display unit displaying an image before image processing related to image rotation is performed in the third embodiment. FIG. 7 is a schematic diagram of a display unit displaying an image after image processing related to image rotation in the third embodiment. FIG. 7 is a diagram illustrating the flow of image processing related to image rotation in the fourth embodiment. FIG. 7 is a diagram illustrating the flow of image processing related to image rotation in the fifth embodiment.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that the following embodiments do not limit the present invention according to the claims, and not all combinations of features described in the present embodiments are essential to the solution of the present invention. . In the following embodiments and claims, radiation includes not only X-rays but also α-rays, β-rays, γ-rays, and various particle beams.

[First embodiment]
(Configuration of radiography system)
FIG. 1 is a diagram showing the configuration of a radiographic system according to a first embodiment of the present invention. The radiography system 10 includes a control device 100, a radiation detection device 110, an operation section 120, a RIS 130 (radiology information system), a PACS 131 (medical image management system), an output section 132 (PRINTER), a display section 140, and a radiation generating section. A device 150 is provided.

The radiation detection device 110 detects radiation emitted from the radiation generation device 150 and passed through a subject (not shown), and outputs image data corresponding to the radiation. Note that the image data can also be referred to as a medical image or a radiation image. The radiation detection device 110 detects the radiation that has passed through the subject as an electric charge corresponding to the amount of transmitted radiation.

As a configuration for converting radiation into electric charge, for example, the radiation detection device 110 may include a direct conversion type sensor such as a-Se that converts radiation into electric charge, or a direct conversion sensor that converts radiation into electric charge, or a sensor that converts radiation into visible light. An indirect sensor using a scintillator such as CsI and a photoelectric conversion element such as a-Si is used. Further, the radiation detection device 110 generates image data of digital data by A/D converting the charges of the detected analog data, and outputs the image data to the control device 100.

The control device 100 is connected to an RIS 130 for inputting examination orders (examination information), a PACS 131 for managing radiation images, an output section 132 (PRINTER), and a display section 140, and uses the radiation detection device 110 and the radiation generation device 150. It is possible to control radiography based on the The control device 100 is connected to the radiation generating device 150 and the radiation detecting device 110, for example, via a wired or wireless network or a dedicated line. The radiation detection device 110 generates image data based on radiation generated by the radiation generation device 150 and outputs the generated image data to the control device 100.

The control device 100 is connected to an operation unit 120 and receives instructions from an operator input through the operation unit 120. The control device 100 can control the image processing unit 102 based on instructions input from the operation unit 120, and the image processing unit 102 performs image processing on image data output from the radiation detection device 110. Then, the control device 100 displays the image processed on the display unit 140. The control device 100 can output an image to the display unit 140 and perform display control to provide a graphical user interface using the display unit 140 while controlling the operation of the radiation detection device 110.

The control device 100 has one or more processors and a memory, and the processor executes a program stored in the memory, thereby realizing the functional configuration of each part described below. However, as long as the functional configuration of each part performs the same function, some or all of the parts may be realized by hardware such as a dedicated integrated circuit.

The control device 100 controls the radiation imaging system 10 while coordinating the radiation generating device 150 and the radiation detecting device 110. The control device 100 has an image acquisition section 101, an image processing section 102, an examination information input section 103, and an output processing section 108 as functional configurations. Further, the image processing section 102 includes a reference point determining section 104, a rotation angle determining section 105, and a rotation processing section 106 as a configuration for performing image processing on the image data output from the radiation detection device 110. Further, the image processing unit 102 has, as a functional configuration, a display processing unit 107 that performs display processing in order to display the image processed on the display unit 140.

The image acquisition unit 101 acquires image data from the radiation detection device 110.

The examination information input unit 103 receives input of examination information manually input by the operator from the operation unit 120. Further, the examination information input unit 103 accepts selections from the operation unit 120 regarding the examination information acquired from the RIS 130. The examination information input unit 103 sets an imaging target based on the selected examination information in response to an operation input in which an operator selects any one of the plurality of examination information via the operation unit 120.

An image processing unit 102 that processes images acquired by radiography performs image processing such as noise removal on image data acquired from the radiation detection device 110. The image processing unit 102 can also perform image processing such as trimming and rotation on the image data acquired from the radiation detection device 110.

As a characteristic configuration of the first embodiment, the image processing unit 102 has a processing function of rotating an image to an arbitrary angle with a single operation input from the operation unit 120. The image processing unit 102 includes a reference point determination unit 104 that determines a reference point that is the center of rotation of the image, a rotation angle determination unit 105 that determines the rotation angle, and a rotation angle determination unit 105 that determines the rotation angle. The rotation processing unit 106 includes a rotation processing unit 106 that performs image rotation processing based on the rotated angle, and a display processing unit 107 that performs display processing to display the image rotated by the rotation processing unit 106 on the display unit 140. The specific processing of each part will be explained later.

The output processing unit 108 converts the processed image output from the image processing unit 102 into a DICOM format and outputs it to the PACS 131 and the output unit 132 (PRINTER).

(Flow of shooting process)
Next, the flow of imaging processing by the radiation imaging system 10 according to the first embodiment will be explained. FIG. 2 is a flowchart illustrating the flow of photographing processing. In step S201, the test information input unit 103 selects whether to use the test information received from the RIS 130 or manually input the test information from the operation unit 120 as a method for inputting the test information, and selects whether to use the test information received from the RIS 130 or manually input the test information from the operation unit 120, and selects the method to input the test information. Enter test information. When the test information input unit 103 selects the latter manual input method as the method for inputting the test information, the process moves to step S203 after inputting the test information. On the other hand, when the test information input unit 103 selects the former input method using the test information received from the RIS 130, the process moves to step S202.

In step S202, the test information input unit 103 selects and sets one of the test information received from the RIS 130 as a test target. For example, the test information input unit 103 inputs the selected test information in response to an operation input by the operator to select one of the plurality of test information displayed in a list format via the operation unit 120. Set the subject to shoot based on.

In step S203, an inspection is started under the control of the control device 100. In order to image the imaging target set based on the examination information manually input in S201 or the examination information selected in S202, the control device 100 causes the radiation detection device 110 to transition to the preparation state. Send a signal.

Based on the signal transmitted from the control device 100, the radiation detection device 110 controls the bias power supply by the main control circuit when a bias voltage is not applied to the two-dimensional image sensor, and biases the two-dimensional image sensor. Apply voltage. After that, in order to read out the dark current signal accumulated in the pixel, the drive circuit performs initialization to read out the image signal from the pixel array. After the initialization is completed, the radiation detection device 110 transmits to the control device 100 status information indicating that it is ready to take a radiation image (ready state). When the state of the radiation detection device 110 becomes the imaging enabled state, it becomes possible for the radiation detection device 110 to take a radiation image.

In step S204, the control device 100 causes the radiation generation device 150 and the radiation detection device 110 to cooperate to capture a radiation image. The drive circuit of the radiation detection device 110 detects the irradiated radiation, reads out an image signal obtained by using the readout circuit, and generates image data. After that, the radiation detection device 110 transmits the image data to the control device 100. The image acquisition unit 101 of the control device 100 acquires image data transmitted from the radiation detection device 110.

In step S205, the image processing unit 102 of the control device 100 performs diagnostic image processing such as noise removal on the image acquired by the image acquisition unit 101, and displays the processed image on the display unit 140.

In step S206, the image processing unit 102 performs image processing related to adjustment of diagnostic image processing and image rotation for rotating and displaying the image of the subject displayed in S205 so that the object to be photographed is displayed straight.

In this step, the image processing unit 102 receives designation of an arbitrary point on the image from the operation unit 120. Then, the image processing unit 102 sets a line connecting the designated point and the reference point, which is the rotation center of the image, as a reference line. The image processing unit 102 determines the rotation angle of the image based on the angle formed between the set reference line and a line passing through the reference point in the plane of the image, and adjusts the image based on the determined rotation angle. Rotate.

Here, the line passing through the reference point includes a perpendicular line that passes through the reference point within the plane of the image and extends in the vertical direction. In the image processing related to image rotation described below, an example of a perpendicular line is explained as a line passing through a reference point, but the line passing through the reference point is not limited to this example. It may also be a line (horizontal line) extending in the horizontal direction. Further, the rotation angle determination unit 105 can also calculate the rotation angle by switching the setting of the line passing through the reference point to a perpendicular line or a horizontal line by inputting from the operation unit 120.

The display unit 140 can provide a graphical user interface (GUI) that accepts designation of any point on the image from the operation unit 120 based on the display control of the control device 100. Then, the image processing unit 102 displays the image rotated based on the determined rotation angle on the display unit 140. Specific processing in each part of the image processing unit 102 will be explained using FIGS. 3 and 4.

In step S207, the inspection is ended by an input operation by the operator. At the timing of the end of the inspection, the output processing unit 108 converts the processed image output from the image processing unit 102 into the DICOM format, and sends the converted image to the external device PACS 131 or the output unit 132 (PRINTER). Output.

(Processing of image processing unit 102)
Next, the processing contents of the reference point determining section 104, rotation angle determining section 105, rotation processing section 106, and display processing section 107, which are the functional configuration of the image processing section 102, will be explained. FIG. 3 is a flowchart illustrating the flow of image processing related to image rotation by the image processing unit 102, and FIG. 4 is a diagram illustrating the processing of the rotation angle determining unit 105.

In step S301, the operator specifies an arbitrary point (hereinafter referred to as a "specified point") on the image displayed on the display section 140 via the operation section 120. The reference point determination unit 104 obtains an arbitrary specified point instructed by the operator via the operation unit 120.

In step S302, the reference point determination unit 104 determines the reference point, which is the rotation center of the image, as the center of the image (photographed image). In this step, the reference point determination unit 104 sets the center of the image as the reference point based on the coordinate information of the image (photographed image).

In step S303, the rotation angle determination unit 105 generates a reference line 403 that connects a designated point 401 designated by the operator and a reference point 402, as shown in FIG. The coordinate system that serves as a reference for the pixels of the specified point 401 and the reference point 402 at this time is the image coordinate system, and the upper left of the image is the origin (0, 0) of the image coordinate system. The reference point determination unit 104, rotation angle determination unit 105, rotation processing unit 106, and display processing unit 107 can perform processing based on coordinate information based on the image coordinate system.

In step S304, the rotation angle determining unit 105 determines the rotation angle of the image based on the angle formed between the reference line 403 connecting the specified point 401 and the reference point 402 and the line passing through the reference point 402. decide. In FIG. 4, an example of a perpendicular line 404 extending in the vertical direction within the plane of the image is shown as an example of a line passing through the reference point 402. The rotation angle determining unit 105 sets a line (perpendicular line 404) that passes through the reference point 402 and extends in the vertical direction within the plane of the image.

Then, the rotation angle determination unit 105 determines the smaller angle as the rotation angle among the absolute values of the plurality of angles formed between the reference line 403 and the line passing through the reference point (perpendicular line 404). In the example of FIG. 4, the rotation angle determination unit 105 calculates the absolute values (α, β shown in FIG. 4) of two angles formed between the reference line 403 and a line passing through the reference point (perpendicular line 404). The angle (α) 405 with the smaller absolute value of the two angles is determined as the inclination angle of the reference line 403 (in the case of Fig. 4, the angle is counterclockwise from the specified point 401, so the rotation angle is negative). value).

In step S305, the rotation angle determination unit 105 determines the tilt angle determined in step S304 as the rotation angle for rotating the image.

In step S306, the rotation processing unit 106 performs a rotation process of rotating the image around the reference point based on the rotation angle determined by the rotation angle determination unit 105.

In step S307, the display processing unit 107 performs display processing to display the image rotated by the rotation processing unit 106 on the display unit 140. The display processing unit 107 performs display control so that the reference point 402 of the rotated image is displayed at the center of the display unit 140. The display processing unit 107 acquires coordinate information regarding the display area of the display unit 140, aligns the coordinate position of the reference point 402 with the coordinate position of the center of the display area of the display unit 140, and displays the rotated image. Control the display as follows.

FIG. 5 is a schematic diagram of the display section 140 displaying an image before performing image processing related to image rotation. In area 501 of display unit 140, an area for displaying the name of the patient under examination is arranged. Further, in the area 502, there is arranged an area for displaying the examination ID under examination. The body part information button 503 displays the body part scheduled to be photographed or the body part which has been photographed, and information for specifying the radiation detection device (sensor) used for the photographing.

It is possible to select execution of rotation processing using a rotation button 504 that instructs image rotation processing. In FIG. 5, the rotation button 504 is shaded, indicating that the rotation process is selected. Further, the display unit 140 is provided with an examination hold button 505 for temporarily suspending the examination, and an examination end button 506 for ending the examination.

Displayed on the display area 507 are a captured image area 508 that is an area of a captured image, and an irradiation field area 509 in the captured image. A mouse pointer 510 is shown specifying an arbitrary point via the operation unit 120. When the mouse pointer 510 is moved to an arbitrary position and an operation for specifying the position is input from the operation unit 120, the specified position is set as a specified point.

In the first embodiment, the reference point that is the rotation center of the image is determined as the center of the image (the captured image area 508 that is the area of the captured image), and the rotation processing unit 106 performs rotation processing around this reference point. Execute.

FIG. 6 is a schematic diagram of the display section 140 displaying an image after performing rotation processing. The rotation button 601 for instructing rotation processing is in a non-selected state since the rotation processing has been completed. The display of the rotation button 601 is changed from the hatched display of the rotation button 504 in FIG. 5 to an outline display.

Through the rotation processing of the rotation processing unit 106, the captured image area 602, which is the captured image area, is rotated around the center of the image (reference point), and the display processing unit 107 rotates the center of the image (reference point) to the center of the display unit 140. Control the display so that it is displayed on the screen. The display processing unit 107 calculates a reduction magnification of the photographed image area 602 so that the entire photographed image area 602 (the entire rotated image) fits in the display area of the display unit 140, and based on the calculated reduction magnification. Display control is performed so that the captured image area 602 is displayed in a reduced size.

According to the present embodiment, by specifying a specified point with a single operation of the operation unit 120, image rotation processing and display control of the image after rotation processing can be performed, and an input device such as a mouse can be used. It is possible to quickly set the desired angle without performing troublesome operations such as clicking a button many times, and it is possible to improve visibility when checking images.

It becomes possible to provide an image processing technique that can rotate an image to a desired rotation angle with a single operation and reduce the burden on the operator.

Furthermore, even if the imaged part of the subject is far away from the center of the image, by displaying an image that has been rotated to match the center of the display unit 140, it is possible to improve the visibility of the displayed image. possible image processing techniques can be provided.

[Second embodiment]
In the second embodiment, a configuration in which the reference point is not the center of the image but the center of the irradiation field area will be described. The configuration of the radiation imaging system 10 is similar to the configuration of the first embodiment, and the description of parts that overlap with the first embodiment will be omitted, and the description will focus on the different parts.

FIG. 7 is a flowchart illustrating the flow of image processing related to image rotation in the second embodiment. In the flowchart of FIG. 7, the processing contents of steps S301 and S303 to S307 are the same as those of the flowchart of FIG. 3, and differ from the flowchart of FIG. 3 in that the method of setting the reference point (S701) is different. In step S701 in FIG. 7, the reference point determination unit 104 determines the reference point, which is the rotation center of the image, as the center of the irradiation field area in the image (captured image). In this step, the reference point determining unit 104 sets the center of the irradiation field area as a reference point based on the coordinate information of the irradiation field area in the image (captured image).

FIG. 8 is a schematic diagram of the display section 140 displaying an image before performing image processing related to image rotation. A rotation button 801 for instructing image rotation processing is in a selected state in which rotation processing is selected.

On the display area 807, a photographed image area 802, which is an area of the photographed image, and an irradiation field area 803 in the photographed image are displayed. An imaging target 808 included in the irradiation field area 803 is displayed off the center of the imaging image area 802. A mouse pointer 804 is shown specifying an arbitrary point via the operation unit 120. In the second embodiment, the reference point, which is the center of rotation of the image, is determined as the center of the irradiation field region 803, and the rotation processing unit 106 executes rotation processing around this reference point.

FIG. 9 is a schematic diagram of the display section 140 displaying an image after performing the rotation process. The rotation button 902 for instructing rotation processing is in a non-selected state since the rotation processing has been completed. The display of the rotation button 902 is changed from the hatched display of the rotation button 801 in FIG. 8 to the white display.

Through the rotation processing of the rotation processing unit 106, the captured image area 901, which is the captured image area, is rotated around the center (reference point) of the irradiation field area 803, and the control device 100 rotates the center (reference point) of the irradiation field area 803. Display control is performed so that the image is displayed at the center of the display unit 140. The control device 100 calculates the reduction magnification of the photographed image region 901 so that the entire photographed image region 901 (the entire rotated image) fits on the display unit 140, and based on the calculated reduction magnification, the photographed image region 901 Control the display so that it is displayed in a reduced size.

According to the second embodiment, it is possible to rotate an image to a desired rotation angle with a single operation, making it possible to provide an image processing technique that can reduce the burden on the operator. Furthermore, even if the imaged part of the subject is far away from the center of the image, by displaying an image that has been rotated to match the center of the display unit 140, it is possible to improve the visibility of the displayed image. possible image processing techniques can be provided.

[Third embodiment]
In the third embodiment, a configuration will be described in which the reference point is set as the center of the image when the irradiation field area is the entire image (photographed image) or when recognition of the irradiation field area fails. The configuration of the radiation imaging system 10 is similar to the configuration of the first embodiment, and the description of parts that overlap with the first embodiment will be omitted, and the description will focus on the different parts.

FIG. 10 is a flowchart illustrating the flow of image processing related to image rotation in the third embodiment. In the flowchart of FIG. 10, the processing contents of steps S301 to S307 are the same as the processing contents of the flowchart of FIG. 3, and the processing contents of step S701 are the same as the processing contents of the flowchart of FIG.

In the flowchart of FIG. 10, the determination process of S1001 is newly added, and the reference point determination unit 104 determines whether or not an irradiation field area exists in the image (S1001), and based on the determination, the reference point Switch settings (S302, S701).

In step S1001, the reference point determining unit 104 determines whether the irradiation field region exists as a partial region in the captured image. When the irradiation field area is the entire image (captured image) or when the recognition (obtainment) of the irradiation field area in the image (captured image) fails, the reference point determination unit 104 determines whether the irradiation field area is the entire area in the captured image. It is determined that the file does not exist (S1001-Yes), and the process advances to step S302.

In this case, the reference point determination unit 104 determines the reference point, which is the rotation center of the image, as the center of the image (photographed image) (S302). If there is no irradiation field region in the image, the reference point determining unit 104 sets the center of the image as the reference point based on the coordinate information of the image (photographed image).

On the other hand, if the reference point determination unit 104 determines in step S1001 that the irradiation field region exists as a partial region in the captured image (S1001-No), the process proceeds to step S701.

In this case, the reference point determination unit 104 determines the reference point, which is the rotation center of the image, as the center of the irradiation field area in the image (captured image) (S701). If an irradiation field region exists in the image, the reference point determining unit 104 sets the center of the irradiation field region as a reference point based on the coordinate information of the irradiation field region.

FIG. 11 is a schematic diagram of the display unit 140 displaying an image before performing image processing related to image rotation. In FIG. 11, although there is a photographed image area 1101 that is a photographed image area, recognition of the irradiation field area has failed, so a state is displayed in which no irradiation field area exists in the photographed image area 1101. A mouse pointer 1102 is shown specifying an arbitrary point via the operation unit 120. A rotation button 1103 for instructing image rotation processing is in a selected state in which rotation processing is selected.

In the display example shown in FIG. 11, the reference point determination unit 104 determines that the irradiation field region does not exist (S1001-Yes), so the reference point that is the rotation center of the image is The rotation processing unit 106 executes rotation processing around this reference point (S302).

FIG. 12 is a schematic diagram of the display unit 140 displaying an image after performing rotation processing. The rotation button 1202 for instructing rotation processing is in a non-selected state since the rotation processing has been completed. The display of the rotation button 1202 is changed from the hatched display of the rotation button 1103 in FIG. 11 to an outline display.

Through the rotation processing of the rotation processing unit 106, the captured image area 1201, which is the captured image area, is rotated around the center of the image (reference point), and the display processing unit 107 rotates the center of the image (reference point) to the center of the display unit 140. Control the display so that it is displayed on the screen. The display processing unit 107 calculates the reduction magnification of the photographed image area 1201 so that the entire photographed image area 1201 (the entire rotated image) can fit on the display unit 140, and based on the calculated reduction magnification, the photographed image area Display control is performed so that 1201 is displayed in a reduced size.

According to the third embodiment, it is possible to determine whether or not the irradiation field region exists as a partial region in the photographed image, and to switch the setting of the reference point according to the determination result. This makes it possible to apply image processing related to image rotation to various images, and it is possible to rotate an image to a desired rotation angle with a single operation, reducing the burden on the operator. It becomes possible to provide possible image processing techniques. Furthermore, even if the imaged part of the subject is far away from the center of the image, by displaying an image that has been rotated to match the center of the display unit 140, it is possible to improve the visibility of the displayed image. possible image processing techniques can be provided.

[Fourth embodiment]
In the fourth embodiment, a configuration will be described in which the reference point is set as the center of the image when the center of the image is included in the irradiation field region. The configuration of the radiation imaging system 10 is similar to the configuration of the first embodiment, and the description of parts that overlap with the first embodiment will be omitted, and the description will focus on the different parts.

FIG. 13 is a flowchart illustrating the flow of image processing related to image rotation in the fourth embodiment. In the flowchart of FIG. 13, the processing contents of steps S301 to S307 are the same as the processing contents of the flowchart of FIG. 3, and the processing contents of step S701 are the same as the processing contents of the flowchart of FIG.

In the flowchart of FIG. 13, the determination process of S1301 is newly added, and the pre-reference point determining unit 104 determines whether the center of the image is included in the irradiation field area based on the coordinate information. (S1301), and the setting of the reference point is switched based on the determination (S302, S701).

In step S1301, the reference point determining unit 104 determines whether the center of the image is included within the irradiation field region. The reference point determination unit 104 determines whether the coordinate information of the center of the image (photographed image) is included in the irradiation field area of the photographed image based on a comparison of the coordinate information. If the reference point determination unit 104 determines that the center of the image is included in the irradiation field area of the photographed image (S1301-Yes), the process advances to step S302.

If the center of the image is included in the irradiation field area, there is a high possibility that the subject to be photographed that the operator wants to confirm exists in a position close to the center of the image. A reference point, which is the center of rotation, is determined as the center of the image (photographed image) (S302).

On the other hand, if the reference point determining unit 104 determines in step S1301 that the center of the image is not included in the irradiation field area of the captured image (S1302-No), that is, the reference point determining unit 104 If it is determined that the center of the image exists at a position distant from the irradiation field area, the process advances to step S701.

In this case, since there is a high possibility that the subject to be photographed that the operator wants to confirm exists away from the center of the image, the reference point determination unit 104 sets the reference point, which is the center of rotation of the image, to the image (captured image ) is determined as the center of the irradiation field area (S701).

According to the fourth embodiment, in addition to the effects of the above embodiments, the relative positional relationship between the center of the captured image and the irradiation field area determines whether the center of the image is included in the irradiation field area or not. It is possible to determine the reference point and switch the setting of the reference point according to the determination result.

It becomes possible to apply image processing related to image rotation to the image of the subject that the operator wants to confirm, and it becomes possible to display the image centered on the reference point set according to the judgment result. .

[Fifth embodiment]
In the fifth embodiment, a configuration will be described in which a reference point is determined based on position information of a designated point designated by an operator. The configuration of the radiation imaging system 10 is similar to the configuration of the first embodiment, and the description of parts that overlap with the first embodiment will be omitted, and the description will focus on the different parts.

FIG. 14 is a flowchart illustrating the flow of image processing related to image rotation in the fifth embodiment. In the flowchart of FIG. 14, the processing contents of steps S301 to S307 are the same as the processing contents of the flowchart of FIG. 3, and the processing contents of step S701 are the same as the processing contents of the flowchart of FIG.

In the flowchart of FIG. 14, determination processes in S1401 and S1402 are newly added, and the setting of the reference point is switched according to the determination results in S1401 and S1402 (S302, S701).

In step S1401, the reference point determining unit 104 determines whether the specified point specified by the operator in the previous step S301 is included in the irradiation field area. The reference point determination unit 104 determines whether the specified point is included in the irradiation field area based on the coordinate information. That is, the reference point determining unit 104 determines whether the specified point is included in the irradiation field area based on a comparison between the coordinate information of the irradiation field area and the coordinate information of the specified point.

If the reference point determination unit 104 determines that the specified point is included in the irradiation field area of the photographed image (S1401-Yes), the process advances to step S701.

In this case, the reference point determining unit 104 determines the reference point, which is the rotation center of the image, as the center of the irradiation field area in the image (captured image) (S701).

On the other hand, if the reference point determination unit 104 determines in step S1401 that the specified point is not included in the irradiation field area of the captured image (S1401-No), the process proceeds to step S1402.

In step S1402, the reference point determination unit 104 determines which of the center of the photographed image or the center of the irradiation field region the designated point is closer to.

If the specified point is not included in the irradiation field area (S1401-No), the reference point determining unit 104 determines the center of the image, which is acquired based on the coordinate information of the center of the image and the coordinate information of the specified point. and the specified point (first distance), the distance between the center of the irradiation field area and the specified point, obtained based on the coordinate information of the center of the irradiation field area, and the coordinate information of the specified point. (second distance), the setting of the reference point is switched.

In this step, first, the reference point determination unit 104 determines the distance between the center of the image and the designated point based on the coordinate information of the center of the image acquired based on the coordinate information of the image and the coordinate information of the designated point. Obtain the distance (first distance).

Next, the reference point determination unit 104 determines the center of the irradiation field area and the specified point based on the coordinate information of the center of the irradiation field area acquired based on the coordinate information of the irradiation field area and the coordinate information of the specified point. Obtain the distance between (second distance). The reference point determining unit 104 compares the acquired distances (first distance, second distance) and determines which of the center of the photographed image and the center of the irradiation field region the designated point is closer to. do.

The comparison process in step S1402 determines that the distance between the center of the image and the specified point (first distance) is shorter than the distance between the center of the irradiation field region and the specified point (second distance). In this case, the reference point determination unit 104 determines that the designated point is close to the center of the image (S1402-Yes), and advances the process to step S302.

In this case, the reference point determination unit 104 determines the reference point, which is the rotation center of the image, as the center of the image (photographed image) (S302).

On the other hand, if the distance between the center of the image and the specified point (first distance) is equal to or greater than the distance between the center of the irradiation field region and the specified point (second distance) as a result of the comparison process in step S1402, The reference point determination unit 104 determines that the designated point is close to the center of the irradiation field area (S1402-No), and advances the process to step S701. In this case, as in the case of the determination result of S1401-Yes, the reference point determining unit 104 determines the reference point, which is the rotation center of the image, as the center of the irradiation field area in the image (captured image) (S701).

According to the fifth embodiment, in addition to the effects of the above-described embodiments, the setting of the reference point can be dynamically switched based on the position of the specified point specified by the operator. There is no need to perform settings, and the burden on the operator can be reduced.

(Other embodiments)
The present invention provides a system or device with a program that implements one or more functions of the embodiments described above via a network or a storage medium, and one or more processors in a computer of the system or device reads and executes the program. This can also be achieved by processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention.

100 Control device 101 Image acquisition section 102 Image processing section 104 Reference point determination section 105 Rotation angle determination section 106 Rotation processing section 107 Display processing section 108 Output processing section 110 Radiation detector 120 Operation section 130 RIS (Radiology information system)
131 PACS (Medical Image Management System)
132 Output section (PRINTER)
140 Display section

Claims (20)

An image processing device that processes images obtained by radiography,
a reference point determining means for determining a reference point that is a rotation center of the image based on a determination as to whether an irradiation field region exists in the image ;
of the image based on the angle formed between a reference line connecting an arbitrary specified point in the image specified according to an operation by the operator and the reference point, and a line passing through the reference point. a rotation angle determining means for determining a rotation angle;
rotation processing means for rotating the image based on the rotation angle;
An image processing device comprising: 2. The reference point determining means, when the irradiation field region exists in the image, sets the center of the irradiation field region as the reference point based on coordinate information of the irradiation field region. 1. The image processing device according to 1 . 2. The reference point determining means sets the center of the image as the reference point based on coordinate information of the image when the irradiation field region does not exist in the image. Image processing device. An image processing device that processes images obtained by radiography,
a reference point determining unit that determines a reference point that is a rotation center of the image based on a determination as to whether the center of the image is included in the irradiation field area based on the coordinate information;
of the image based on the angle formed between a reference line connecting an arbitrary specified point in the image specified according to an operation by the operator and the reference point, and a line passing through the reference point. a rotation angle determining means for determining a rotation angle;
rotation processing means for rotating the image based on the rotation angle;
An image processing device comprising : 5. The image processing apparatus according to claim 4 , wherein the reference point determining means sets the center of the image as the reference point if the center of the image is included in the irradiation field region. 5. The image processing apparatus according to claim 4 , wherein the reference point determining means sets the center of the irradiation field area as the reference point when the center of the image is not included in the irradiation field area. An image processing device that processes images obtained by radiography,
Based on the coordinate information, a reference point, which is the rotation center of the image, is determined based on a determination as to whether an arbitrary specified point in the image specified according to an operation by an operator is included in the irradiation field area. Reference point determining means;
of the image based on the angle formed between a reference line connecting an arbitrary specified point in the image specified according to an operation by the operator and the reference point, and a line passing through the reference point. a rotation angle determining means for determining a rotation angle;
rotation processing means for rotating the image based on the rotation angle;
An image processing device comprising : 8. The image processing apparatus according to claim 7 , wherein the reference point determining means sets the center of the irradiation field area as the reference point when the designated point is included in the irradiation field area. The reference point determining means includes:
When the specified point is not included in the irradiation field area,
Based on a comparison between a first distance between the center of the image and the specified point and a second distance between the center of the irradiation field region and the specified point, which are obtained based on coordinate information, The image processing apparatus according to claim 7 , wherein the setting of the reference point is switched. 10. The reference point determining means sets the center of the image as the reference point if the designated point is determined to be close to the center of the image based on the comparison. Image processing device. 2. The reference point determining means, when determining, based on the comparison, that the specified point is close to the center of the irradiation field region, sets the center of the irradiation field region as the reference point. 9. The image processing device according to 9 . 2. The rotation angle determining means determines a smaller angle as the rotation angle among absolute values of a plurality of angles formed between the reference line and a line passing through the reference point. 12. The image processing device according to any one of 1 to 11 . further comprising a display processing means for performing display processing to display the image rotated by the rotation processing means on a display means,
The image according to any one of claims 1 to 12 , wherein the display processing means performs display control so that the reference point of the rotated image is displayed at the center of the display means. Processing equipment. The display processing means calculates a reduction magnification of the image so that the entire rotated image fits within a display area of the display means, and displays the image in a reduced size based on the calculated reduction magnification. The image processing device according to claim 13 , wherein the image processing device performs control. 15. The image processing apparatus according to claim 1, wherein the line passing through the reference point is a perpendicular line passing through the reference point and extending in a vertical direction within a plane of the image. a radiation imaging device that images radiation;
An image processing system comprising: the image processing device according to claim 1 , which is communicatively connected to the radiation imaging device. An image processing method in an image processing device that processes images acquired by radiography, the method comprising:
a step in which the reference point determining means determines a reference point that is a rotation center of the image based on a determination as to whether an irradiation field region exists in the image ;
The rotation angle determining means determines the angle formed between a reference line connecting an arbitrary specified point in the image specified in response to an operation by an operator and the reference point, and a line passing through the reference point. determining a rotation angle of the image based on the image;
An image processing method comprising the step of rotating the image based on the rotation angle. An image processing method in an image processing device that processes images acquired by radiography, the method comprising:
a step in which the reference point determining means determines a reference point that is a rotation center of the image based on a determination as to whether the center of the image is included in the irradiation field area based on the coordinate information;
The rotation angle determining means determines the angle formed between a reference line connecting an arbitrary specified point in the image specified in response to an operation by an operator and the reference point, and a line passing through the reference point. determining a rotation angle of the image based on the image;
An image processing method comprising the step of rotating the image based on the rotation angle. An image processing method in an image processing device that processes images obtained by radiography, the method comprising:
The reference point determining means determines the rotation center of the image based on the coordinate information and determines whether an arbitrary specified point in the image specified in response to an operation by an operator is included in the irradiation field area. a step of determining a reference point;
The rotation angle determining means determines the angle formed between a reference line connecting an arbitrary specified point in the image specified in response to an operation by an operator and the reference point, and a line passing through the reference point. determining a rotation angle of the image based on the image;
An image processing method comprising the step of rotating the image based on the rotation angle. A program that causes a computer to execute each step of the image processing method according to any one of claims 17 to 19.

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