Exposure management system

1. An exposure management system comprising: a processing circuitry configured to

calculate a deviation index related to a difference between a target exposure index indicating an index of a target exposure value for approximating an exposure value in an X-ray image taking process and an image-taking-period exposure index indicating an index of the exposure value observed during the X-ray image taking process; and

cause a display to display history information from a predetermined time period indicating at least one selected from between image-taking-period exposure indices and deviation indices, wherein

the processing circuitry is configured to cause the target exposure index and a history of the deviation indices during the predetermined time period to be displayed on a correction screen for correcting the target exposure index based on the history of the deviation indices.

2. The exposure management system according to claim 1 , wherein the processing circuitry is configured to select one of the deviation indices displayed by the display and cause the display to display imaging information related to the selected deviation index.

3. The exposure management system according to claim 2 , wherein the imaging information includes at least one selected from between the image taking condition and a taken X-ray image.

4. The exposure management system according to claim 1 , wherein the processing circuitry is configured to cause the display to display a history of deviation indices exhibited under each image taking condition during the predetermined time period.

5. The exposure management system according to claim 4 , wherein the image taking condition is at least one selected from among an operator, a detector, an examination room, an examination facility, and an examined site.

6. The exposure management system according to claim 1 , wherein the processing circuitry is configured to cause the display to display, in a list view, the target exposure indices each of which is set for a different one of image taking items of an examined site of which X-ray images are to be taken.

7. The exposure management system according to claim 6 , wherein the processing circuitry is configured to cause one or both of absolute values and relative values of the target exposure indices to be displayed in a list view, as the target exposure indices.

8. The exposure management system according to claim 7 , wherein the processing circuitry is configured to receive a changing operation to change one or more of the target exposure indices.

9. The exposure management system according to claim 8 , wherein the processing circuitry is configured to cause the display to display a change history of the target exposure indices.

10. The exposure management system according to claim 1 , wherein the processing circuitry is configured to calculate a change candidate value for the target exposure index on a basis of the history of the deviation indices during the predetermined time period and cause the display to display the calculated change candidate value.

11. The exposure management system according to claim 10 , wherein the processing circuitry is configured to receive a selecting operation to select one or more deviation indices that are to be used for calculating the change candidate value from among the deviation indices during the predetermined time period and calculate the change candidate value by using the one or more selected deviation indices.