Radiography apparatus and method for controlling the radiography apparatus

A radiography apparatus comprising:

• a radiographer configured to:
• acquire a first radiation image of a subject before a contrast reagent is injected into the subject;
• and
• acquire a second radiation image of the subject after the contrast reagent is injected into the subject;
• and
• an image processor configured to:
• calculate a difference between data of each of a plurality of pixels of the first radiation image and data of one pixel of the second radiation image, respectively;
• and
• acquire an image of the subject based the difference for each of the plurality of pixels of the first radiation image,
• wherein the first radiation image is of a high resolution, and the second radiation image is of the high resolution, and
• the image processor is further configured to:
• down-sample the first radiation image of the high resolution and the second radiation image of the high resolution to acquire the first radiation image of a low resolution and the second radiation image of the low resolution;
• and
• calculate a difference between data of a pixel of the first radiation image of the low resolution and data of a pixel of the second radiation image of the low resolution, for each of pixels of the first radiation image of the low resolution.

A radiography apparatus comprising:

• an image processor configured to:
• calculate a difference between data of each of a plurality of pixels of a first radiation image of a subject without a contrast reagent and data of one pixel of a second radiation image of the subject with the contrast reagent, respectively;
• determine a degree of difference based on the difference for each of the plurality of pixels of the first radiation image, for each of pixels of the second radiation image;
• and
• acquire an image of the subject based on the degree of difference for each of the pixels of the second radiation image,
• wherein the first radiation image is of a high resolution, and the second radiation image is of the high resolution, and
• the image processor is further configured to:
• down-sample the first radiation image of the high resolution and the second radiation image of the high resolution to acquire the first radiation image of a low resolution and the second radiation image of the low resolution;
• and
• calculate a difference between data of a pixel of the first radiation image of the low resolution and data of a pixel of the second radiation image of the low resolution, for each of pixels of the first radiation image of the low resolution.