Radiation imaging apparatus, radiation imaging method, and non-transitory computer-readable storage medium
A radiation imaging apparatus includes: an image obtaining unit configured to obtain image data corresponding to incident radiation; and an image processing unit configured to perform first bone density measurement based on image data obtained by the image obtaining unit with a first exposure field and perform second bone density measurement based on image data obtained by the image obtaining unit with a second exposure field narrower than the first exposure field.
1. A radiation imaging apparatus, comprising:
an image obtaining unit configured to obtain image data corresponding to incident radiation; and
an image processing unit configured to perform first bone density measurement based on image data obtained by the image obtaining unit with a first exposure field, and perform second bone density measurement based on image data obtained by the image obtaining unit with a second exposure field that is narrower then the first exposure field.
2. The radiation imaging apparatus according to claim 1 , further comprising an exposure field setting unit configured to set an exposure field of the radiation, wherein
the exposure field setting unit sets the first exposure field that enables imaging of a plurality of regions of an object in the first bone density measurement, and sets the second exposure field that enables imaging of at least some of the plurality of regions in the second bone density measurement with an exposure field that is narrower than the first exposure field.
3. The radiation imaging apparatus according to claim 2 , wherein the first exposure field includes a lumbar vertebra and a femur proximal portion as the plurality of regions, and
the second exposure field includes one of lumbar vertebra and the femur proximal portion as the some of the regions.
4. The radiation imaging apparatus according to claim 2 , wherein the exposure field setting unit sets the second exposure field by using a learned model associated with setting of an exposure field corresponding to a region subjected to the second bone density measurement.
5. The radiation imaging apparatus according to claim 2 , wherein the exposure field setting unit sets the second exposure field based on a result obtained by the first bone density measurement.
6. The radiation imaging apparatus according to claim 2 , wherein the radiation is not applied to a region other than the second exposure field.
7. The radiation imaging apparatus according to claim 1 , further comprising a control unit configured to control the image processing unit so as to execute the first bone density measurement and the second bone density measurement.
8. The radiation imaging apparatus according to claim 7 , wherein the control unit shifts a process to perform the second bone density measurement when a measurement value obtained by the first bone density measurement is lower than a predetermined value.
9. An information processing apparatus comprising an image processing unit configured to perform first bone density measurement based on image data obtained in accordance with radiation in a first exposure field and to perform second bone density measurement based on image data obtained in accordance with radiation in a second exposure field that is narrower than the first exposure field.
10. The information processing apparatus according to claim 9 , wherein the image processing unit performs the second bone density measurement with the second exposure field based on a result obtained by the first bone density measurement.
11. The information processing apparatus according to claim 9 , wherein the image processing unit performs the second bone density measurement with the second exposure field based on a measurement value obtained by the first bone density measurement and a predetermined threshold.
12. The information processing apparatus according to claim 9 , wherein the image processing unit discriminates whether to omit the first bone density measurement with the first exposure field and performs the second bone density measurement with the second exposure field in accordance with a discrimination result.
13. The information processing according to claim 9 , wherein the image processing unit comprises a creating unit configured to create a bone image indicating a bone distribution based on a difference between image data corresponding to radiation based on a first tube voltage and image data corresponding to radiation based on a second tube voltage, an extraction unit configured to extract a bone region subjected to bone density measurement from the bone image, and a calculation unit configured to calculate a bone density of the bone region, and
the calculation unit sets a soft tissue region near the bone region, corrects a pixel value of the bone region based on a pixel value of the soft tissue region, and calculates a bone density of the bone region based on the corrected pixel value of the bone region.
14. The information processing according to claim 13 , wherein the extraction unit applies an extraction result of the bone region extracted in the first bone density measurement to extraction of a bone region in the second bone density measurement.
15. The information processing according to claim 9 , wherein in the first bone density measurement, the first bone density measurement is performed based on image data obtained in accordance with radiation generated with a single tube voltage, and
in the second bone density measurement, the second bone density measurement is performed based on image data obtained in accordance with radiation generated with a plurality of tube voltages including the signal tube voltage.
16. The information processing according to claim 9 , wherein in the second bone density measurement, the second bone density measurement is performed by using the image data obtained in the first bone density measurement and image data obtained in accordance with radiation generated with a tube voltage different from the signal tube voltage.
17. A radiation imaging system, comprising:
a radiation detection apparatus; and
the information processing apparatus according to claim 9 , which is configured to process image data obtained from the radiation detection apparatus.
18. The radiation imaging system according to claim 17 , further comprising a generating unit configured to generate the radiation, wherein
the generating unit generates cone-beam radiation by supplying a pulse signal based on a tube voltage to a radiation source.
19. The radiation imaging system according to claim 17 , further comprising a generating unit configured to generate the radiation, wherein
the generating unit generates the radiation based on a first tube voltage and the radiation based on a second tube voltage lower than the first tube voltage.
20. The radiation imaging system according to claim 17 , further comprising a generating unit configured to generate the radiation; and
an exposure field setting unit configured to set an exposure field of the radiation, wherein
a size of a radiation exposure field aperture provided on the generating unit is changed in accordance with a size of the exposure field set by the exposure field setting unit.
21. A radiation imaging method for a radiation imaging apparatus including an image obtaining unit configured to obtain image data corresponding to incident radiation, the method comprising:
a first step of performing first bone density measurement based on image data obtained by the image obtaining unit with a first exposure field; and
a second step of performing second bone density measurement based on image data obtained by the obtaining unit with a second exposure field that is narrower than the first exposure field.
22. A non-transitory computer-readable storage medium storing a program for causing a computer to execute the method according to claim 21 .
23. A radiation detection apparatus, comprising:
a pixel array for creating a signal corresponding to radiation, wherein
the radiation detection apparatus obtains image data for performing first bone density measurement in a first exposure field, and
obtains image data for performing second bone density measurement in a second exposure field narrower than the first exposure field.
24. An information processing method comprising an image processing unit configured to perform first bone density measurement based on image data obtained in accordance with radiation in a first exposure field and to perform second bone density measurement based on image data obtained in accordance with radiation in a second exposure field narrower than the first exposure field.
25. A non-transitory computer-readable storage medium storing a program for causing a computer to execute the method according to claim 24 .