X-ray computed tomography apparatus

An X-ray computed tomography apparatus, comprising:

• a first X-ray tube configured to generate X-rays with which a subject to be examined is irradiated;
• a first X-ray detector configured to detect X-rays transmitted through the subject;
• a second X-ray tube configured to generate X-rays with which a treatment target of the subject is irradiated;
• a second X-ray collimator having an aperture which is used to collimate X-rays from said second X-ray tube and whose aperture width and position are variable;
• a rotating mechanism configured to rotate said first X-ray tube, said first X-ray detector, and said second X-ray tube around the subject;
• a reconstructing unit configured to repeat reconstruction of an image based on data detected by said X-ray detector along with rotation of said first X-ray tube and said first X-ray detector;
• an image processor configured to repeatedly extract a region of the treatment target from the image;
• a controller configured to dynamically change the aperture of said collimator upon rotation of said second X-ray tube based on the extracted region of the treatment target;
• and
• a first X-ray collimator having an aperture which is used to collimate X-rays from said first X-ray tube and has an aperture width that is variable, the aperture of said first X-ray collimator having a variable range narrower than a variable range of the aperture of said second X-ray collimator.

An X-ray computed tomography apparatus, comprising:

• a first X-ray tube configured to generate X-rays with which a subject to be examined is irradiated;
• a first X-ray detector configured to detect X-rays transmitted through the subject;
• a second X-ray tube configured to generate X-rays with which the subject is irradiated;
• and
• a high voltage generator configured to supply power to said first X-ray tube within a first range and to supply power to said second X-ray tube within a second range wider than the first range, wherein
• said high voltage generator includes a plurality of power supplies, a first selector configured to select one of connections between said first X-ray tube and said plurality of power supplies, and a second selector configured to select one of connections between said second X-ray tube and said plurality of power supplies, and
• said apparatus further comprises a controller configured to control said first and second selectors to supply, to said second X-ray tube, power higher than that supplied to said first X-ray tube.

An X-ray computed tomography apparatus, comprising:

• a first X-ray tube configured to generate X-rays with which a subject to be examined is irradiated;
• a first X-ray detector configured to detect X-rays transmitted through the subject;
• a second X-ray tube configured to generate X-rays with which the subject is irradiated;
• a high voltage generator configured to supply power to said first X-ray tube within a first range and to supply power to said second X-ray tube within a second range wider than the first range;
• a first X-ray collimator having an aperture which is used to collimate X-rays from said first X-ray tube and has an aperture width that is variable;
• and
• a second X-ray collimator having an aperture which is used to collimate X-rays from said second X-ray tube and has an aperture width that is variable, the aperture of said second X-ray collimator having a variable range wider than a variable range of the aperture of said first X-ray collimator.

An X-ray computed tomography apparatus, comprising:

• a first X-ray tube configured to generate X-rays with which a subject to be examined is irradiated;
• a first X-ray detector configured to detect X-rays transmitted through the subject;
• a second X-ray tube configured to generate X-rays with which the subject is irradiated;
• a first X-ray collimator having an aperture which is used to collimate X-rays from said first X-ray tube and has an aperture width that is variable within a first range;
• and
• a second X-ray collimator having an aperture which is used to collimate X-rays from said second X-ray tube and has an aperture width that is variable within a second range wider than the first range.