Patent ID: 11961165
Assignee: FUJIFILM CORPORATION
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. A tomographic image generating apparatus comprising at least one processor,
wherein the processor is configured to:
acquire a plurality of projection images corresponding to a plurality of radiation source positions, the plurality of projection images being generated by causing an imaging apparatus to perform tomosynthesis imaging in which a radiation source is moved relative to a detection surface of a radiation detector in order to emit radiation to a subject at the plurality of radiation source positions according to movement of the radiation source;
reconstruct all or a part of the plurality of projection images to generate a tomographic image on each of a plurality of tomographic planes of the subject;
detect at least one feature point from a plurality of the tomographic images;
project the plurality of projection images on a corresponding tomographic plane corresponding to the tomographic image in which the feature point is detected based on a positional relationship between the radiation source position and the radiation detector in a case of imaging the plurality of projection images to acquire a tomographic plane projection image corresponding to each of the plurality of projection images; and
set a plurality of first local regions including the feature point in the plurality of tomographic plane projection images, set a second local region including the feature point in the tomographic image in which the feature point is detected, derive a positional shift amount of each of the plurality of first local regions with respect to the second local region as a temporary positional shift amount, and derive a positional shift amount between the plurality of projection images based on body movement of the subject based on the plurality of the temporary positional shift amounts,
wherein the processor is further configured to reconstruct the plurality of projection images excluding a target projection image which corresponds to a target tomographic plane projection image of which the positional shift amount is to be derived, and generate the plurality of tomographic images as target tomographic images, and
derive the positional shift amount of the target tomographic plane projection image by using the target tomographic images.