US-12616437-B2 - X-ray imaging apparatus

US12616437B2US 12616437 B2US12616437 B2US 12616437B2US-12616437-B2

Abstract

This X-ray imaging device has an X-ray source, an X-ray detector, an image generation unit for generating an X-ray image, a site acquisition unit for acquiring a region for each site in the X-ray image based on a trained model, a region-of-interest selection unit for selecting a region-of-interest, and an X-ray condition adjustment unit to adjust the conditions of X-rays emitted from the X-ray source based on a first pixel value that a pixel value in the region-of-interest.

Inventors

Daisuke Matsuki
Junya Yamamoto

Assignees

SHIMADZU CORPORATION

Dates

Publication Date: 20260505
Application Date: 20211125

Claims (11)

1 . An X-ray imaging apparatus comprising: an X-ray source configured to irradiate a patient with X-rays; an X-ray detector configured to detect the X-rays emitted from the X-ray source; an image generation unit as a processor configured to generate an X-ray image based on a detection signal of the X-rays detected by the X-ray detector; a region acquisition unit as the processor configured to acquire a region of a part, the region of the part having a shape of the part in the X-ray image, based on a trained model that has been trained to classify a plurality of parts captured in the X-ray image; a region-of-interest setting unit as the processor configured to set a region-of-interest inside the region of the part acquired by the region acquisition unit as the processor; and an X-ray condition adjustment unit as the processor configured to adjust conditions of X-rays emitted from the X-ray source, based on a first pixel value that is a pixel value inside the region-of-interest set by the region-of-interest setting unit as the processor, without using a pixel value outside the region-of-interest.
2 . The X-ray imaging apparatus as recited in claim 1 , wherein the region acquisition unit as the processor is configured to classify regions of the X-ray image into at least two regions from among a bone tissue region, a soft tissue region, an artifact region, and a background region.
3 . The X-ray imaging apparatus as recited in claim 2 , wherein in a case where a non-region-of-interest is included inside the region of the part, the region-of-interest setting unit as the processor is configured to set a region in which the non-region-of-interest is excluded from the region of the part, as the region-of-interest, and wherein the X-ray condition adjustment unit as the processor is configured to adjust conditions of the X-rays, based on the first pixel value of the region-of-interest in which the non-region-of-interest is excluded from the region of the part.
4 . The X-ray imaging apparatus as recited in claim 2 , further comprising: a memory configured to store an imaging region of the patient and a region of the part set in advance as the region-of-interest in an associated state, wherein the region-of-interest setting unit as the processor is configured to set the region of the part corresponding to the imaging region, as the region-of-interest.
5 . The X-ray imaging apparatus as recited in claim 4 , wherein the trained model includes a plurality of trained models that have been trained to classify the part corresponding to the imaging region for each of a plurality of imaging regions, and wherein the region acquisition unit as the processor is configured to acquire the region of the part in the X-ray image, based on the trained model corresponding to the imaging region out of a plurality of the trained models.
6 . The X-ray imaging apparatus as recited in claim 2 , further comprising: an input device configured to receive an operation input of a user; and a part designation reception unit as the processor configured to receive a designation of the region of the part to be set as the region-of-interest, based on the operation input received by the input device.
7 . The X-ray imaging apparatus as recited in claim 2 , further comprising: an input device configured to receive an operation input of a user; a rectangular region setting unit as the processor is configured to set a rectangular region in the X-ray image, based on the operation input received by the input device, wherein the region-of-interest setting unit as the processor configured to set the rectangular region set by the rectangular region setting unit as the processor as the region-of-interest, based on the operation input received by the input device.
8 . The X-ray imaging apparatus as recited in claim 2 , further comprising: an input device configured to receive an operation input of a user; and a rectangular region setting unit as the processor configured to set a rectangular region in the X-ray image, based on the operation input received by the input device, wherein the region-of-interest setting unit as the processor is configured to: set, as the region-of-interest, a region in which the rectangular region is excluded from the region of the part acquired by the region acquisition unit as the processor in a case where the rectangular region is set and that any one of the regions in the part is selected.
9 . The X-ray imaging apparatus as recited in claim 2 , further comprising: an input device configured to receive an operation input of a user; and a rectangular region setting unit as the processor configured to set a rectangular region in the X-ray image, based on the operation input received by the input device, wherein the region-of-interest setting unit as the processor is configured to set, as the region-of-interest, both the region of the part acquired by the region acquisition unit as the processor and the rectangular region as the region-of-interest in a case where the rectangular region is set and that any one of the regions in the part is selected.
10 . The X-ray imaging apparatus as recited in claim 1 , further comprising: a memory configured to store an ideal pixel value that is an ideal pixel value set in advance for each imaging region of the patient, wherein the X-ray condition adjustment unit as the processor is configured to adjust the conditions of X-rays so that the first pixel value approaches the ideal pixel value.
11 . The X-ray imaging apparatus as recited in claim 1 , wherein the conditions of X-rays include at least a tube voltage.

Description

TECHNICAL FIELD The present invention relates to an X-ray imaging apparatus, and more particularly to an X-ray imaging apparatus capable of performing imaging by adjusting X-ray conditions. BACKGROUND ART Conventionally, with regard to an X-ray imaging apparatus, in particular, there is known an X-ray imaging apparatus that performs imaging by adjusting the X-ray conditions. Such an X-ray imaging apparatus is disclosed, for example, in Japanese Patent No. 6737337. The X-ray fluoroscopic imaging apparatus disclosed in Japanese Patent No. 6737337 is equipped with an X-ray tube, an X-ray detector, an image generation unit, and a controller. The controller is equipped with a region-of-interest setting unit for setting the region-of-interest on an X-ray image generated by the image generation unit and an irradiation condition automatic adjustment unit for calculating the X-ray irradiation conditions based on the luminance of the region-of-interest. The region-of-interest setting unit is configured to set a rectangular-shaped region-of-interest on the X-ray image. Further, the irradiation condition automatic adjustment unit is configured to compare the image luminance value within the rectangular-shaped region-of-interest with a predetermined ideal luminance value and to calculate the X-ray irradiation conditions so that the luminance value of the X-ray image becomes the ideal luminance value. PRIOR ART DOCUMENT Patent Document Patent Document 1: Japanese Patent No. 6737337 SUMMARY OF THE INVENTION Problems to be Solved by the Invention Here, although not disclosed in Japanese Patent No. 6737337, it may happen that an X-ray image may capture various sites, such as, e.g., bones and internal organs. Therefore, as disclosed in Japanese Patent No. 6737337, when setting up a rectangular-shaped region-of-interest, multiple sites may be included within the region-of-interest. In this case, in some cases, sites other than the site that the user desires to visually recognize may be included in the region-of-interest. In the case where sites other than the site that the user desires to visually recognize are included in the region-of-interest, there are cases where the X-ray irradiation conditions (X-ray conditions) are not suitable for the site that the user desires to visually recognize due to the difference between the X-ray absorption rate at the site that the user desires to visually recognize and the X-ray absorption rate at the other sites. In this case, the inconvenience of reduced visibility of the site that the user desires to visually recognize occurs. For this reason, there is a need for an X-ray imaging apparatus capable of suppressing the deterioration of visibility of the site that the user desires to visually recognize by enabling the user to easily adjust the X-ray imaging conditions to suit the site that the user desires to visually recognize. The present invention has been made to solve the above-mentioned problem. The purpose of the present invention is to provide an X-ray imaging apparatus capable of suppressing a decrease in visibility of a site that a user desires to visually recognize by enabling the user to easily adjust X-ray conditions to suit the site that the user desires to visually recognize. Means for Solving the Problems In order to attain the above-described objects, an X-ray imaging apparatus according to one aspect of the present invention includes: an X-ray source configured to irradiate a patient with X-rays;an X-ray detector configured to detect the X-rays emitted from the X-ray source;an image generation unit configured to generate an X-ray image based on a detection signal of the X-rays detected by the X-ray detector; anda site acquisition unit configured to acquire a region for each site in the X-ray image, based on a trained model that has been trained to classify sites captured in the X-ray image;a region-of-interest selection unit configured to select a region-of-interest from a region of the site acquired by the site acquisition unit; andan X-ray condition adjustment unit configured to adjust conditions of X-rays emitted from the X-ray source, based on a first pixel value that is a pixel value inside the region-of-interest selected by the region-of-interest selection unit. Effects of the Invention The X-ray imaging apparatus according to the above-described first aspect is provided with, as described above, a site acquisition unit configured to acquire a region for each site in an X-ray image, based on a trained model, a region-of-interest selection unit configured to select a region-of-interest from a region of a site acquired by the site acquisition unit, and an X-ray condition adjustment unit configured to adjust conditions of X-rays emitted from the X-ray source, based on a first pixel value that is a pixel value in the region-of-interest selected by the region-of-interest selection unit. With this, the X-ray conditions are adjusted based on the first pixel value that is a