CN-116636864-B - X-ray imaging apparatus and imaging position correction method

Abstract

An X-ray photographing apparatus and a photographing position correcting method are provided. The X-ray imaging device is provided with an X-ray irradiation unit, an X-ray detection unit, and a correction information acquisition unit that identifies the outer edges of each of a plurality of predetermined portions of an imaging object of an object in an X-ray image, and acquires positional correction information for correcting the relative position of the X-ray irradiation unit with respect to the imaging object of the object based on the positional relationship between the identified outer edges of the plurality of predetermined portions. The position correction information includes a relative movement direction and a relative movement amount for correcting a relative position of the X-ray irradiation unit with respect to the imaging target object of the subject to be imaged to a position of the X-ray image in which a positional relationship between outer edges of the plurality of predetermined portions can be imaged in a predetermined positional relationship.

Inventors

• OKUMURA KOSHI
• YAMAMOTO JUNYA
• Wu Tianliao

Assignees

• 株式会社岛津制作所

Dates

Publication Date

20260505

Application Date

20230118

Priority Date

20220222

Claims (20)

1. 1. An X-ray imaging device is provided with: an X-ray irradiation unit that irradiates an object with X-rays; an X-ray detection unit for detecting X-rays irradiated from the X-ray irradiation unit and transmitted through the subject, and A correction information acquisition unit that specifies outer edges of respective predetermined portions of one imaging object of the subject based on the X-ray image captured by the X-ray detection unit, and acquires positional correction information for correcting a relative position of the X-ray irradiation unit with respect to the imaging object of the subject, which is a bone or an artificial joint of the subject, based on a positional relationship between the specified outer edges of the predetermined portions of the one imaging object so that the outer edges of the respective predetermined portions of the one imaging object overlap each other at least partially, The position correction information includes a relative movement direction and a relative movement amount of a position of the X-ray image, which are used for correcting a relative position of the X-ray irradiation unit with respect to the imaging object of the subject, to a position in which a positional relationship between outer edges of the plurality of predetermined portions of the one imaging object can be imaged, the position being mapped in a predetermined positional relationship.
2. 2. The X-ray imaging apparatus according to claim 1, wherein, The X-ray imaging device is configured to perform at least one of notifying the position correction information acquired by the correction information acquisition unit and performing control for changing the relative position of the X-ray irradiation unit with respect to the imaging target object of the subject based on the position correction information.
3. 3. The X-ray imaging apparatus according to claim 2, further comprising: a moving mechanism for changing the relative position of the X-ray irradiation part relative to the object, and A movement control unit that controls the movement mechanism to change the relative position of the X-ray irradiation unit with respect to the subject, The movement control unit is configured to control the movement mechanism to change the relative position of the X-ray irradiation unit with respect to the imaging object of the subject based on the position correction information acquired by the correction information acquisition unit.
4. 4. An X-ray photographic apparatus according to claim 3, wherein, Further comprises a top plate for placing the subject, The movement control unit performs control for automatically moving the position of at least one of the X-ray irradiation unit and the top plate based on the position correction information acquired by the correction information acquisition unit so that the relative position of the X-ray irradiation unit with respect to the imaging object of the subject becomes a position at which the X-ray image in which the positional relationship between the outer edges of the plurality of predetermined portions is mapped in the predetermined positional relationship can be imaged.
5. 5. An X-ray photographic apparatus according to claim 3, wherein, Further comprises a top plate for placing the subject, When one of the X-ray irradiation section and the top plate is moved based on an operation by a user, the movement control section performs control for restricting movement of the one of the X-ray irradiation section and the top plate based on the positional correction information acquired by the correction information acquisition section.
6. 6. The X-ray imaging apparatus according to claim 2 to 5, wherein, The imaging apparatus further includes a display unit that displays, as a notification of the positional correction information acquired by the correction information acquisition unit, at least one of a relative movement direction of the X-ray irradiation unit with respect to the imaging object of the subject and a relative movement direction of the X-ray irradiation unit, the relative movement direction being corrected to a position where the X-ray image is mapped in the predetermined positional relationship in the positional relationship between the outer edges of the plurality of predetermined portions.
7. 7. The X-ray imaging apparatus according to claim 2 to 5, wherein, The correction information acquisition unit is configured to acquire relative positional deviations between outer edges of a plurality of predetermined portions of the imaging object of the subject in the X-ray image based on positional relationships between the outer edges of the plurality of predetermined portions, and to acquire the positional correction information based on the acquired relative positional deviations between the outer edges of the plurality of predetermined portions.
8. 8. The X-ray imaging apparatus according to any one of claims 1 to 5, wherein, The correction information acquisition unit is configured to acquire a relative positional shift between outer edges of the plurality of predetermined portions on the basis of overlapping between outer edges of the plurality of predetermined portions of the bone or artificial joint of the subject in the X-ray image, and to calculate the position correction information for correcting a relative position of the X-ray irradiation unit with respect to the bone or artificial joint of the subject to a position at which the X-ray image in which the outer edges of the plurality of predetermined portions overlap each other can be imaged.
9. 9. The X-ray imaging apparatus according to claim 8, wherein, The correction information acquisition unit is configured to calculate, when at least one of a knee side and a scapula of a femur of the subject is imaged, the position correction information for correcting a relative position of the X-ray irradiation unit with respect to a bone or an artificial joint of the subject to a position where the X-ray images in which outer edges of the plurality of predetermined portions are overlapped with each other can be imaged.
10. 10. The X-ray imaging apparatus according to any one of claims 1 to 5, wherein, The correction information acquisition unit is configured to acquire relative positional displacement between outer edges of the plurality of predetermined portions on the basis of positional relationships between outer edges of the respective predetermined portions of the bone or artificial joint of the subject in the X-ray image, and to calculate the position correction information for correcting the relative position of the X-ray irradiation unit with respect to the bone or artificial joint of the subject to a position at which the X-ray image in which the outer edges of the plurality of predetermined portions are concentrically imaged can be imaged.
11. 11. The X-ray photography apparatus as claimed in claim 10, wherein, The correction information acquisition unit is configured to calculate the position correction information for correcting the relative position of the X-ray irradiation unit with respect to the bone or artificial joint of the subject to a position at which the X-ray images of the outer edges of the plurality of predetermined portions can be concentrically imaged, when the elbow side of the humerus of the subject is imaged.
12. 12. The X-ray imaging apparatus according to any one of claims 1 to 5, wherein, The correction information acquisition unit is configured to acquire the position correction information based on a positional relationship between outer edges of the plurality of predetermined portions of the imaging object of the subject in a position-correction-before-image generated based on irradiation of X-rays having a smaller radiation amount than when the position-correction-after-image is taken, the position-correction-after-image being taken after a relative position of the X-ray irradiation unit with respect to the imaging object of the subject is corrected.
13. 13. The X-ray imaging apparatus according to any one of claims 1 to 5, wherein, The correction information acquisition unit is configured to acquire the outer edges of the plurality of predetermined portions based on the input X-ray image by inputting the X-ray image into a learning model obtained by machine learning the X-ray image obtained by capturing the image of the imaging object as input data, and to calculate the position correction information based on the acquired outer edges of the plurality of predetermined portions.
14. 14. The X-ray imaging apparatus according to any one of claims 1 to 5, wherein, The correction information acquisition unit is configured to calculate the position correction information based on parameter information corresponding to actual distances between the plurality of predetermined portions of the imaging object of the subject.
15. 15. The X-ray imaging apparatus according to claim 14, wherein, The correction information acquisition unit detects, as the parameter information, a size of a detection target portion of the subject in the X-ray image of the subject.
16. 16. The X-ray imaging apparatus according to claim 15, wherein, The correction information acquisition unit detects, as the parameter information, a size of the detection target portion of the subject from the X-ray image captured for acquiring the position correction information.
17. 17. The X-ray imaging apparatus according to claim 15, wherein, The correction information acquisition unit detects, as the parameter information, a size of the detection target portion of the subject from the X-ray image captured in advance at a different imaging angle from the X-ray image used to acquire the position correction information.
18. 18. The X-ray imaging apparatus according to claim 14, wherein, Further comprises an imaging unit for imaging the appearance of the subject, The correction information acquisition unit is configured to calculate the position correction information based on the parameter information as physique information that is information indicating a size of the subject calculated from the appearance image of the subject obtained by the imaging performed by the imaging unit.
19. 19. A photographing position correction method comprising the steps of: an irradiation step of irradiating an object with X-rays from an X-ray irradiation unit; a detection step of detecting X-rays transmitted through the subject, and A correction information acquisition step of determining outer edges of respective predetermined portions of one photographic subject, which is a bone or an artificial joint of the subject, as the subject based on the X-ray image captured in the detection step, and acquiring positional correction information for correcting a relative position of the X-ray irradiation section with respect to the photographic subject of the subject based on a positional relationship between the determined outer edges of the predetermined portions of the one photographic subject so that the outer edges of the respective predetermined portions of the one photographic subject overlap each other at least partially, The position correction information includes a relative movement direction and a relative movement amount of a position of the X-ray image, which are used for correcting a relative position of the X-ray irradiation unit with respect to the imaging object of the subject, to a position in which a positional relationship between outer edges of the plurality of predetermined portions of the one imaging object can be imaged, the position being mapped in a predetermined positional relationship.
20. 20. The method for correcting a photographing position according to claim 19, wherein, And a position correction step of notifying the position correction information acquired in the correction information acquisition step and performing control for changing a relative position of the X-ray irradiation section with respect to the imaging object of the subject based on the position correction information.

Description

X-ray imaging apparatus and imaging position correction method Technical Field The present invention relates to an X-ray imaging apparatus and an imaging position correction method. Background Conventionally, an X-ray imaging apparatus is known. Such a device is disclosed in, for example, japanese patent application laid-open No. 2014-117368. The above-mentioned japanese patent application laid-open No. 2014-117368 discloses an X-ray photographing device provided with an X-ray source that irradiates X-rays, an X-ray detector that detects the X-rays, and a display device that displays a synthesized moving image obtained by synthesizing an optical moving image and a guide image. In this X-ray imaging apparatus, the operator instructs the patient to change the imaging position while observing the composite moving image displayed on the display device on the control room side. The patient also changes his/her own imaging position while observing the composite moving image displayed on the display device on the imaging room side. Here, the imaging of an X-ray image in the field of orthopedics is difficult and easy for a radiologist who is experienced. For example, in the case of taking an X-ray image of the side surface of a knee joint for diagnosing diseases around the knee joint such as osteoarthritis and osteoarthritis, it is necessary to adjust the imaging position to take an X-ray image in which the outer edge of the medial condyle (the portion on the midline side of the knee side of the femur) and the outer edge of the lateral condyle (the portion on the opposite side of the knee side of the femur) overlap each other, so that the diseases can be accurately diagnosed. However, since there are individual differences in the shape of bones and the manner of attachment of meat to legs, it is very difficult for even an experienced radiologist to adjust the imaging position according to the appearance of the subject and to perform X-ray image imaging such that the outer edge of the medial condyle of the femur overlaps the outer edge of the lateral condyle. Therefore, in order to capture an X-ray image in which the outer edge of the medial condyle of the femur overlaps with the outer edge of the lateral condyle and thus a diagnosis can be accurately performed, it is necessary to correct the imaging position based on the captured X-ray image after the X-ray image is captured. In order to capture an X-ray image that can be accurately diagnosed, it is necessary to repeat the imaging of the X-ray image and the correction of the imaging position. Thus, the amount of radiation and the imaging time of the subject increase. Therefore, it is desirable to acquire an X-ray image capable of accurately performing diagnosis while suppressing an increase in the radiation amount and the photographing time. Disclosure of Invention The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an X-ray imaging apparatus and an imaging position correction method capable of acquiring an X-ray image that can be accurately diagnosed while suppressing an increase in the radiation amount and imaging time. An X-ray imaging device according to a first aspect of the present invention includes an X-ray irradiation unit that irradiates an object with X-rays, an X-ray detection unit that detects X-rays irradiated from the X-ray irradiation unit and transmitted through the object, and a correction information acquisition unit that specifies respective outer edges of a plurality of predetermined portions of an object to be imaged in an X-ray image captured based on detection signals of the X-ray detection unit, and acquires positional correction information for correcting a relative position of the X-ray irradiation unit with respect to the object to be imaged in the object based on a positional relationship between the specified outer edges of the plurality of predetermined portions, wherein the positional correction information includes a relative movement direction and a relative movement amount for correcting the relative position of the X-ray irradiation unit with respect to the object to be imaged in a positional relationship between the outer edges of the plurality of predetermined portions. The imaging position correction method according to the second aspect of the present invention includes an irradiation step of irradiating an object with X-rays from an X-ray irradiation unit, a detection step of detecting X-rays transmitted through the object, and a correction information acquisition step of determining outer edges of each of a plurality of predetermined portions of an imaging object of the object in an X-ray image imaged based on the detection of the X-rays in the detection step, and acquiring position correction information for correcting a relative position of the X-ray irradiation unit with respect to the imaging object of the object based on a positional relationsh