X-RAY DIAGNOSTIC APPARATUS AND MEDICAL INFORMATION PROCESSING METHOD
An X-ray diagnostic apparatus according to an embodiment includes processing circuitry configured to improve quality of fourth data corresponding to a fourth number of views that is smaller than a first number of views by inputting the fourth data to a learned model generated by performing machine learning with second data corresponding to a second number of views as input learning data, and third data corresponding to a third number of views that is larger than the second number of views as output learning data, the second data and the third data being acquired based on first data corresponding to the first number of views. The fourth data is data acquired by tomosynthesis imaging.
1 . An X-ray diagnostic apparatus comprising:
processing circuitry configured to improve quality of fourth data corresponding to a fourth number of views that is smaller than a first number of views by inputting the fourth data to a learned model generated by performing machine learning with second data corresponding to a second number of views as input learning data, and third data corresponding to a third number of views that is larger than the second number of views as output learning data, the second data and the third data being acquired based on first data corresponding to the first number of views, wherein
the fourth data is data acquired by tomosynthesis imaging.
2 . The X-ray diagnostic apparatus according to claim 1 , wherein
the first data is projection data of the first number of views, and
the second data is generated by downsampling the first data.
3 . The X-ray diagnostic apparatus according to claim 1 , wherein
the first data is projection data of the first number of views, and
the second data is generated by performing forward projection of the second number of views on reconstructed image data reconstructed from the first data.
4 . The X-ray diagnostic apparatus according to claim 1 , wherein
the fourth data is projection data of the fourth number of views, and
the processing circuitry inputs the fourth data to the learned model to generate processed projection data corresponding to a fifth number of views that is larger than the fourth number of views, and performs reconstruction processing on the generated processed projection data to generate reconstructed image data.
5 . The X-ray diagnostic apparatus according to claim 1 , wherein
the fourth data is reconstructed image data generated by performing reconstruction processing on projection data of the fourth number of views, and
the processing circuitry generates reconstructed image data of higher quality than quality of the fourth data by inputting the fourth data to the learned model.
6 . The X-ray diagnostic apparatus according to claim 1 , wherein
the storage circuitry stores, as the learned model, a first learned model that receives input of projection data to improve quality of the projection data and a second learned model that receives input of reconstructed image data to improve quality of the reconstructed image data, and
the processing circuitry inputs projection data of the fourth number of views to the first learned model to generate processed projection data corresponding to a fifth number of views that is larger than the fourth number of views, performs reconstruction processing on the generated processed projection data to generate processed reconstructed image data, and inputs the processed reconstructed image data to the second learned model to improve quality of the processed reconstructed image data.
7 . The X-ray diagnostic apparatus according to claim 1 , wherein
the fourth data is projection data of the fourth number of views, and
the processing circuitry inputs the fourth data to the learned model to adjust a parameter related to an iterative reconstruction method, and uses the adjusted parameter to generate reconstructed image data.
8 . The X-ray diagnostic apparatus according to claim 1 , wherein the second data is data corresponding to a sparser sparse view than the third data, or data corresponding to a limited angle with a narrower angle range than the third data.
9 . The X-ray diagnostic apparatus according to claim 1 , wherein the learned model is generated by machine learning using the first data as the third data.
10 . The X-ray diagnostic apparatus according to claim 1 , wherein the first data is X-ray data collected by computed tomography.
11 . The X-ray diagnostic apparatus according to claim 1 , wherein the first data and the second data are X-ray data collected by tomosynthesis imaging.
12 . The X-ray diagnostic apparatus according to claim 1 , wherein the third number of views is smaller than the first number of views.
13 . The X-ray diagnostic apparatus according to claim 1 , wherein the fourth number of views corresponds to the second number of views.
14 . The learned model is generated by using a generative adversarial network (GAN) or a discriminator network (DNN).
15 . A medical information processing apparatus comprising:
processing circuitry configured to
acquire, based on first data corresponding to a first number of views, second data corresponding to a second number of views and third data corresponding to a third number of views that is larger than the second number of views; and
perform machine learning with the second data as input learning data and the third data as output learning data to generate a learned model.
16 . A medical information processing method comprising improving quality of fourth data corresponding to a fourth number of views that is smaller than a first number of views, the fourth data being data acquired by tomosynthesis imaging, by inputting the fourth data to a learned model generated by performing machine learning with second data corresponding to a second number of views as input learning data, and third data corresponding to a third number of views that is larger than the second number of views as output learning data, the second data and the third data being acquired based on first data corresponding to the first number of views.
17 . The medical information processing method according to claim 16 , wherein
the first data is projection data of the first number of views, and
the second data is generated by downsampling the first data.
18 . The medical information processing method according to claim 16 , wherein
the first data is projection data of the first number of views, and
the second data is generated by performing forward projection of the second number of views on reconstructed image data reconstructed from the first data.
19 . The medical information processing method according to claim 16 , wherein the second data is data corresponding to a sparser sparse view than the third data, or data corresponding to a limited angle with a narrower angle range than the third data.