X-ray detector, x-ray imaging apparatus having the same, and method of controlling the same

An X-ray imaging apparatus, comprising:

• an X-ray source configured to radiate X-rays onto an object;
• an X-ray detector configured to detect X-rays transmitted through the object among the radiated X-rays, the X-ray detector comprising:
• a plurality of pixels which are two-dimensionally arranged and configured to output an electrical signal corresponding to the detected X-rays,
• a plurality of gate lines configured to connect the plurality of pixels in a row direction,
• a plurality of data lines configured to connect the plurality of pixels in a column direction,
• a read-out circuit configured to read out the electrical signal generated by the plurality of pixels through the plurality of data lines, and
• a switcher configured to independently turn connections between the respective data lines in the plurality of data lines and the read-out circuit on and off, to thereby obtain a frame image;
• and
• an image processor configured to obtain information on a region of interest (ROI) from the frame image obtained by the X-ray detector and deliver the information on the ROI to the X-ray detector.

A method of controlling an X-ray detector comprising a plurality of pixels which are two-dimensionally arranged and output an electrical signal corresponding to incident X-rays, the method comprising:

• receiving information on a region of interest (ROI);
• obtaining a frame image of the ROI at a first read-out rate;
• and
• obtaining a frame image of a background surrounding the ROI at a second read-out rate that is different from the first read-out rate.

A method of controlling an X-ray imaging apparatus, comprising:

• radiating X-rays onto an object;
• detecting X-rays transmitted through the object among the radiated X-rays and obtaining a frame image of the object based on the detected X-rays;
• obtaining information on a region of interest (ROI) from the frame image of the object;
• and
• obtaining a frame image of the ROI and a frame image of a background surrounding the ROI at different read-out rates.

An X-ray detector, comprising:

• a detection region comprising a plurality of pixels configured to detect X-rays transmitted through an object and generate corresponding electrical signals based on the detected X-rays;
• a switcher configured to independently switch the respective pixels on and off to thereby control read-out rates at which the electrical signals are output;
• and
• a detector controller configured to control the switcher such that pixels corresponding to a region of interest (ROI) of the object output electrical signals at a different read-out rate than a read-out rate at which remaining pixels other than the pixels corresponding to the ROI output electrical signals.