Radiation image processing apparatus and radiation image capturing system

1. A radiation image processing apparatus comprising:

a display which displays an image; and

a hardware processor which is configured to,

acquire radiographic moving image data comprising a plurality of frame images,

subject the moving image data to predetermined analytical processing,

generate an analyzed moving image comprising a plurality of analyzed frame images,

select a plurality of specific analyzed frame images from the analyzed frame images of the analyzed moving image,

derive a calculation signal value based on signal values of pixels having common coordinates positioned in common coordinates in the selected specific analyzed frame images, and

cause a calculated image based on the calculation signal values generated for each of the coordinates to appear on the display,

wherein the hardware processor

extracts a maximum, a minimum, or a mode of the signal values of pixels having common coordinates in the specific analyzed frame images, and

calculates a ratio of a difference between the maximum and the minimum of the signal values of the pixels having common coordinates to the number of selected specific analyzed frame images, calculates a standard deviation of the signal values of the pixels having common coordinates, or calculates an integral of the signal values of the pixels having common coordinates, or

calculates differences between the signal values of pixels having common coordinates in every two consecutive specific analyzed frame images and derives the calculation signal value through extraction of a maximum or a minimum of the differences.

2. The radiation image processing apparatus according to claim 1 , wherein the hardware processor defines a summary display region in at least a portion of the display region of the display and causes the calculated images to appear in the summary display region.

3. The radiation image processing apparatus according to claim 1 , further comprising:

an operating unit operated by a user,

wherein the hardware processor selects the specific analyzed frame images based on a user operation of the operating unit.

4. The radiation image processing apparatus according to claim 1 , wherein the hardware processor automatically selects the specific analyzed frame images based on a predetermined selection pattern.

5. The radiation image processing apparatus according to claim 4 , further comprising:

an operating unit operated by a user,

wherein the hardware processor sets a selection pattern from a plurality of preliminarily prepared selection patterns based on a user operation of the operating unit, and the hardware processor automatically selects the specific analyzed frame images based on the set selection pattern.

6. The radiation image processing apparatus according to claim 1 , wherein the hardware processor calculates the calculation signal values and derives a predetermined quantitative value based on signal values of regional pixels residing in a specific region in the calculated image, and causes the calculated quantitative value to appear in the summary display region.

7. The radiation image processing apparatus according to claim 6 , wherein the hardware processor,

extracts a maximum, a minimum, or a mode from the signal values of the regional pixels, or

derives the quantitative value through calculation of a ratio of a difference between the maximum and the minimum of the signal values of the regional pixels to the number of regional pixels, or a standard deviation, an average, or an integral of the signal values of the regional pixels.

8. The radiation image processing apparatus according to claim 7 , wherein the specific region is defined in a lung field, a heart region, a pulmonary artery, a main artery, or a pulmonary bronchus.

9. A radiation image capturing system comprising:

a radiation irradiator emitting radiation;

a radiographic-image capturing apparatus receiving radiation from the radiation irradiator and generating radiographic image data; and

the radiation image processing apparatus according to claim 1 directly or indirectly connected to the radiographic-image capturing apparatus to establish communication between the radiographic-image capturing apparatus and the radiation image processing apparatus,

wherein emission of radiation from the radiation irradiator and reading of the image data by the radiographic-image capturing apparatus are continuously repeated to generate radiographic moving image data.