| CPC A61B 6/4007 (2013.01) [A61B 6/032 (2013.01)] | 20 Claims |

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1. An X-ray imaging device comprising:
an X-ray generator including at least one X-ray source configured to radiate X-rays;
an X-ray detector configured to detect X-rays radiated from the X-ray generator; and
a processor configured to:
control the X-ray generator to radiate first X-rays for a first amount of radiation time according to a first mode,
generate a first mode tomography image based on first mode projection data generated based on the first X-rays detected by the X-ray detector,
control the X-ray generator to radiate second X-rays for a second amount of radiation time according to a second mode, and
generate a second mode tomography image based on second mode projection data generated based on the second X-rays detected by the X-ray detector,
wherein the second amount of radiation time is less than the first amount of radiation time.
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